JP2023016014A - Multilayer film and package - Google Patents

Abstract

To provide a multilayer film having high oxygen barrier properties and high suitability for reuse.SOLUTION: There is provided a multilayer film 1 which comprises a first resin layer 11 and a second resin layer 12, wherein the first resin layer 11 and the second resin layer 12 contain polyolefin-based resins of the same type and the oxygen permeation amount of the multilayer film 1 under conditions at a temperature of 23°C and a relative humidity of 60% is 50 cc/(m2 24h atm)) or less, as measured according to JIS K 7126-2:2006.SELECTED DRAWING: Figure 1

Description

The present invention relates to laminated films and packages.

Laminated films configured by laminating a plurality of resin layers are widely used as materials for packages. A typical laminated film includes at least a sealant layer provided for heat sealing with an object to be sealed, and an outer layer provided on the side opposite to the sealant layer side.

On the other hand, such laminated films for packaging are produced and consumed in large quantities all over the world every day because of their high convenience, and a large amount of waste is generated after use. The generation of waste has become an important issue that needs to be resolved from the perspective of improving the global environment. is being considered.

For example, if the main constituent materials of a plurality of resin layers in a laminated film are of the same type, there is no need to separate and reuse each resin layer, and the entire laminated film can be easily reused. Since it can be done, the usefulness increases.
As such a laminate film, for example, a polyethylene laminate for packaging material is disclosed, which comprises at least an oriented polyethylene film, an adhesive layer, and a heat-sealable polyethylene layer, the adhesive layer containing a non-solvent adhesive. (see Patent Document 1).

JP 2019-189333 A

However, the polyethylene laminate for packaging disclosed in Patent Document 1 has a problem that the oxygen barrier property is not necessarily sufficient. Packages for packaging foods and the like are often required to have high oxygen barrier properties.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a laminated film having high oxygen barrier properties and high reusability.

In order to solve the above problems, the present invention employs the following configuration.
[1]. A laminated film, wherein the laminated film comprises a first resin layer and a second resin layer, wherein the first resin layer and the second resin layer contain the same kind of polyolefin resin, and conforms to JIS K 7126-2: 2006, the laminated film has an oxygen permeation amount of 50 cc/(m ² ·24 h·atm) or less under conditions of a temperature of 23°C and a relative humidity of 60%.
[2]. When the laminated film is subjected to dynamic viscoelasticity measurement, the elastic modulus E _F ′ (110) at 110° C. when the vibration frequency is 1 Hz is 3.0×10 ⁷ Pa or less [1] Laminated film according to.
[3]. The laminated film further comprises a third resin layer between the first resin layer and the second resin layer, wherein the first resin layer, the second resin layer, and the third resin layer are , the laminated film according to [1] or [2], which contains the same kind of polyolefin resin.

[4]. The third resin layer is a resin layer (I) containing the polyolefin resin and an ethylene-vinyl alcohol copolymer, and the polyolefin resin is an ethylene-vinyl alcohol copolymer and ethylene-acetic acid. The laminated film according to [3], which is neither a vinyl copolymer nor an ethylene-vinyl alcohol-vinyl acetate copolymer.
[5]. The laminated film according to [4], wherein in the ethylene-vinyl alcohol copolymer, the ratio of the amount of structural units derived from ethylene to the total amount of structural units is 50 mol% or less.
[6]. [4] or [5], wherein the content of the ethylene-vinyl alcohol copolymer in the resin layer (I) is 95% by mass or less with respect to the total mass of the resin layer (I). laminated film.

[7]. The laminated film according to any one of [4] to [6], wherein the resin layer (I) further contains an ethylene-vinyl alcohol-vinyl acetate copolymer.
[8]. The third resin layer is provided on both sides of the resin layer (II) made of an ethylene-vinyl alcohol copolymer or containing an ethylene-vinyl alcohol copolymer as a main component, and the resin layer (II), The laminated film according to [3], which is an adhesive layer containing an adhesive resin.
[9]. The laminated film according to [8], wherein in the ethylene-vinyl alcohol copolymer, the ratio of the amount of structural units derived from ethylene to the total amount of structural units is 50 mol% or less.

[10]. [8] or [9], wherein the adhesive layer contains, as the adhesive resin, one or more selected from the group consisting of modified polyolefin and ethylene-vinyl alcohol-vinyl acetate copolymer. laminated film.
[11]. The laminated films are faced to each other so that the first resin layers face each other, and heat-sealed under the conditions of a sealing temperature of 140 ° C., a sealing pressure of 0.2 MPa, and a sealing time of 2 seconds. A test piece is prepared by cutting an area with a width of 15 mm, and in the test piece, the laminated films are peeled off at a peeling speed of 300 mm / min in accordance with JIS Z 0238: 1998. The laminated film according to any one of [1] to [10], wherein the seal strength of the film is 7 N/15 mm or less when measured.
[12]. The laminated film according to any one of [1] to [11], wherein the first resin layer is an easy peel layer containing a polyethylene resin and a polypropylene resin.

[13]. The laminated film according to any one of [1] to [12], wherein the laminated film is for a deep drawing package.
[14]. A package constructed using the laminated film according to any one of [1] to [13].
[15]. The packaging body includes a lid material and a bottom material, the packaging body is constructed by sealing the lid material and the bottom material, and both the lid material and the bottom material are constructed using the laminated film. wherein the first resin layer in the laminated film constituting the bottom material is an easy peel layer, and the first resin layer in the laminated film constituting the lid material is a non-easy peel layer The package according to [14], which is a peel-type sealant layer.

ADVANTAGE OF THE INVENTION According to this invention, the laminated|multilayer film with high oxygen barrier property and high reusability is provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows typically an example of the laminated|multilayer film which concerns on one Embodiment of this invention. FIG. 4 is a cross-sectional view schematically showing another example of the laminated film according to one embodiment of the present invention; BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows typically an example of the package comprised using the laminated|multilayer film which concerns on one Embodiment of this invention. FIG. 3 is a cross-sectional view schematically showing another example of a package constructed using the laminated film according to one embodiment of the present invention.

<<Laminated film>>
In one embodiment of the present invention, a laminated film comprises a first resin layer and a second resin layer, wherein the first resin layer and the second resin layer contain the same kind of polyolefin-based resin, and conforms to JIS K 7126-2: 2006, the oxygen permeation amount of the laminated film under conditions of a temperature of 23° C. and a relative humidity of 60% is 50 cc/(m ² ·24 h·atm) or less.

Since the first resin layer and the second resin layer of the laminated film of the present embodiment contain the same kind of polyolefin resin, the laminated film is highly reusable.
In addition, the oxygen permeation amount of the laminated film of the present embodiment under the conditions of a temperature of 23 ° C. and a relative humidity of 60% is 50 cc / (m ² · 24 h · atm) or less, and the oxygen of the laminated film of the present embodiment Highly barrier.

<First resin layer>
The first resin layer contains a polyolefin resin.
The polyolefin resin contained in the first resin layer is not particularly limited as long as it has a structural unit derived from an olefin. It may be an olefin copolymer.

Examples of the olefin homopolymer include, for example, very low density polyethylene (VLDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), metallocene catalyst linear low density polyethylene (mLLDPE), medium density polyethylene (PE) such as polyethylene (MDPE) and high density polyethylene (HDPE); polypropylene (homopolypropylene, hPP);
Linear low density polyethylene (LLDPE), metallocene-catalyzed linear low density polyethylene (mLLDPE) and metallocene-catalyzed linear very low density polyethylene (V-mLLDPE) are all types of low density polyethylene (LDPE) is.

Classification of polyethylene according to its density was defined, for example, in the old JIS K 6748:1995. For purposes of this specification, this definition classifies polyethylene according to its density.
Thus, as used herein, very low density polyethylene (VLDPE) means polyethylene having a density of less than 0.91 g/cm ³ .
Low-density polyethylene (LDPE) means polyethylene having a density of 0.91 g/cm ³ or more and less than 0.93 g/cm ³ .
Medium density polyethylene (MDPE) means polyethylene having a density of 0.93 g/cm ³ or more and less than 0.942 g/cm ³ .
High density polyethylene (HDPE) means polyethylene having a density of 0.942 g/cm ³ or more.

Examples of the olefin copolymer include an ethylene copolymer having at least a structural unit derived from ethylene and a propylene copolymer having at least a structural unit derived from propylene.

The ethylene-based copolymer has a structural unit derived from ethylene and a structural unit derived from a monomer other than ethylene. However, in an olefin copolymer having a structural unit derived from ethylene and a structural unit derived from propylene, the number of structural units derived from propylene is equal to the number of structural units derived from ethylene. Copolymers greater than 1000 are conveniently classified as propylene-based copolymers.

Ethylene-based copolymers include, for example, ethylene-vinyl acetate copolymer (EVA), ethylene-vinyl alcohol copolymer (EVOH), ethylene-vinyl alcohol-vinyl acetate copolymer (also known as ethylene-vinyl acetate copolymer partially saponified polymer, sometimes referred to herein as "partially saponified EVA"), ethylene-methyl acrylate copolymer (EMA), ethylene-methyl methacrylate copolymer (EMMA), ethylene- Ethyl acrylate copolymer (EEA), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-ethyl acrylate-maleic anhydride copolymer (E-EA-MAH ), ionomers (ION), and the like.
As the ionomer, for example, a copolymer of ethylene and a small amount of acrylic acid or methacrylic acid is a resin having an ion-bridged structure through salt formation between an acid moiety therein and a metal ion. mentioned.

The propylene-based copolymer has a structural unit derived from propylene and a structural unit derived from a monomer other than propylene.
Examples of propylene-based copolymers include propylene-ethylene random copolymers (also known as polypropylene random copolymers (rPP)) and propylene-ethylene block copolymers (also known as polypropylene block copolymers (bPP)).

The polyolefin-based resin contained in the first resin layer may be of only one type, or may be of two or more types. can be selected to

Preferred examples of the polyolefin-based resin contained in the first resin layer include polyethylene-based resins (polyethylene, ethylene-based copolymer) having structural units derived from ethylene, and polypropylene having structural units derived from propylene. -based resins (homopolypropylene, propylene-based copolymers).

The first resin layer is suitable, for example, as a sealant layer.

When the first resin layer is a sealant layer, the sealant layer may be a non-easy-peel sealant layer (perfect sealant layer) or an easy-peel sealant layer (easy-peel layer). good.

When the first resin layer is a non-easy-peel sealant layer, the polyolefin-based resin contained in the first resin layer is preferably a polyethylene-based resin, such as ultra-low density polyethylene, low-density polyethylene, linear low-density Polyethylene, metallocene-catalyzed linear low density polyethylene or metallocene-catalyzed linear ultra-low density polyethylene is more preferred. That is, the first resin layer is a group consisting of ultra-low density polyethylene, low-density polyethylene, linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene, and metallocene-catalyzed linear ultra-low density polyethylene as polyolefin-based resins. It is preferable to include one or more selected types.
The first resin layer containing linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene, or metallocene-catalyzed linear ultra-low density polyethylene is more It imparts stronger sealing strength to the laminated film.

When the first resin layer is an easy-peel layer (easy-peel sealant layer), the laminated films are placed face to face so that the first resin layers in the laminated films face each other, and the sealing temperature is 140°C. After heat-sealing under the conditions of a sealing pressure of 0.2 MPa and a sealing time of 2 seconds, a test piece is prepared by cutting an area of 15 mm in width from the heat-sealed portion. According to Z 0238: 1998, the peel strength is measured by peeling the laminated films at a peel speed of 300 mm / min, and the measured value of the peel strength was adopted as the seal strength of the laminated film. At this time, the seal strength is preferably 7 N/15 mm or less. The easy peel property of the first resin layer (laminated film) is better when the seal strength is within this range.

More preferably, the sealing strength of the laminated film is, for example, 5 N/15 mm or less.
On the other hand, the sealing strength of the laminated film is preferably 1 N/15 mm or more. The first resin layer (laminated film) having the seal strength within such a range has easy peelability and is sufficiently suppressed from unintended peeling.
In one embodiment, the sealing strength of the laminated film may be either 1 to 7N/15mm and 1 to 5N/15mm. However, these are examples of the seal strength.

The seal strength of the laminated films described above was obtained by matching the flow direction of the resin of these laminated films (Machine Direction, sometimes referred to as "MD" in this specification), and heat-sealing under the above conditions. It may be the seal strength when the laminate films are peeled off from each other under the conditions described above, using the test piece, with the peeling direction matching the MD of these laminate films in the test piece.
In addition, the seal strength of the laminated film described above is obtained by matching the direction perpendicular to the flow direction (MD) of the resin of these laminated films (Transverse Direction, sometimes referred to as "TD" in this specification). , Using the test piece prepared by heat sealing under the above conditions, the peel direction is matched with the TD of these laminated films in the test piece, and the laminated films are peeled under the above conditions. It can be intensity.
In the present embodiment, the seal strength of the laminated film described above is preferably the seal strength when the peeling direction is aligned with the MD of the laminated film.
As described above, when the laminated films are heat-sealed with their MDs or their TDs matched and a test piece is prepared, the peel direction is matched with the MD of the laminated film in the test piece. In this case, the longitudinal direction (perpendicular to the width direction) of the test piece is aligned with the MD of the laminated film. On the other hand, when the peeling direction is matched with the TD of the laminated film in the test piece, the longitudinal direction of the test piece is matched with the TD of the laminated film.

The above-described method for preparing a test piece and measuring the seal strength in consideration of the MD and TD of the laminated film can be applied not only when the first resin layer is an easy peel layer, but also when the first resin layer is a non-easy peel layer. It can also be applied when it is a peel-type sealant layer.

When the first resin layer is an easy-peel layer (easy-peel sealant layer), the first resin layer preferably contains the two incompatible polyolefin resins. Such a first resin layer is suitable as an easy peel layer exhibiting peelability due to cohesive failure.

The first resin layer, which is an easy peel layer, preferably contains the polyethylene-based resin and the polypropylene-based resin as the two incompatible polyolefin-based resins.
Examples of the polyethylene-based resin contained in the first resin layer, which is an easy peel layer, include low-density polyethylene, linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene, and the like.
Examples of the polypropylene-based resin contained in the first resin layer, which is an easy peel layer, include homopolypropylene, propylene-ethylene random copolymer (polypropylene random copolymer), propylene-ethylene block copolymer (polypropylene block copolymer), and the like. mentioned.

Among them, the first resin layer is composed of two incompatible polyolefin-based resins, low-density polyethylene (LDPE) and homopolypropylene (hPP), or ethylene-methacrylic acid copolymer (EMAA) and propylene-ethylene. It preferably contains a random copolymer (rPP).

When the first resin layer, which is an easy peel layer, contains a polyethylene-based resin and a polypropylene-based resin, [the content of the polyethylene-based resin in the first resin layer (parts by mass)]: [the content of the polypropylene-based resin in the first resin layer content (parts by mass)] is preferably 25:75 to 90:10, for example, 28:72 to 87:13 and 30:70 to 85:15. . The easy peel property of the easy peel layer containing low density polyethylene and homopolypropylene in such a range is better.

When the first resin layer, which is an easy peel layer, contains low-density polyethylene and homopolypropylene, [content of low-density polyethylene in the first resin layer (parts by mass)]: [content of homopolypropylene in the first resin layer (parts by mass)] is preferably 60:40 to 90:10, and may be, for example, 65:35 to 87:13 or 70:30 to 85:15. The easy peel property of the easy peel layer containing low density polyethylene and homopolypropylene in such a range is better.

When the first resin layer, which is an easy peel layer, contains an ethylene-methacrylic acid copolymer and a propylene-ethylene random copolymer, [the content of the ethylene-methacrylic acid copolymer in the first resin layer (parts by mass) ]:[Content of propylene-ethylene random copolymer in first resin layer (parts by mass)] is preferably 25:75 to 75:25, for example, 28:72 to 70:30, and any of 30:70 to 65:35. The easy peel property of the easy peel layer containing the ethylene-methacrylic acid copolymer and the propylene-ethylene random copolymer within such a range is better.

The first resin layer may contain other components in addition to the polyolefin-based resin as long as the effects of the present invention are not impaired.
The other components include resin components (herein sometimes referred to as "other resin components") and non-resin components (herein sometimes referred to as "other non-resin components"). ).

The other resin component is not particularly limited as long as it is a resin other than the polyolefin resin.

Examples of the other non-resin components include additives known in the art.
Examples of the additives include antifog agents, antiblocking agents, antioxidants, antistatic agents, crystal nucleating agents, inorganic particles, viscosity reducers, thickeners, heat stabilizers, lubricants, infrared absorbers, An ultraviolet absorber etc. are mentioned.

The other components contained in the first resin layer may be only one type, or may be two or more types, and when there are two or more types, the combination and ratio thereof may be arbitrary depending on the purpose. can be selected to

In the first resin layer, the content of the polyolefin resin with respect to the total mass of the first resin layer (polyolefin resin of the same kind as the polyolefin resin contained in the second resin layer, and polyolefin resin contained in the second resin layer The total content of the polyolefin resin that is not the same type) is preferably 90 to 100% by mass, more preferably 95 to 100% by mass, for example, 97 to 100% by mass, and 99% by mass. It may be anywhere from 100% by mass to 100% by mass. When the ratio is equal to or higher than the lower limit, the effect of the first resin layer containing the polyolefin-based resin can be obtained more remarkably.
The ratio is usually the content of the polyolefin resin (polyolefin of the same kind as the polyolefin resin contained in the second resin layer) with respect to the total content (parts by mass) of the components that do not vaporize at room temperature in the first resin composition described later. is the same as the proportion of the total content of the polyolefin resin and the polyolefin resin that is not the same as the polyolefin resin contained in the second resin layer) (parts by mass).

As used herein, the term "ordinary temperature" means a temperature that is not particularly cooled or heated, that is, a normal temperature.

The first resin layer and the second resin layer contain the same kind of polyolefin resin.
In the present embodiment, not only in the case of polyolefin-based resins, but when resins having a common structural unit are compared with each other, the term "resin of the same type" refers to , means that the ratio of the amount (mole) of common structural units is 20 mol % or more. For example, very low density polyethylene (VLDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), metallocene-catalyzed linear low density polyethylene (mLLDPE), metallocene-catalyzed linear very low density polyethylene (V -mLLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), ethylene-methyl acrylate copolymer (EMA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-ethyl acrylate copolymer (EEA), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-ethyl acrylate-maleic anhydride copolymer (E-EA-MAH), ethylene-vinyl alcohol Copolymer (EVOH), ethylene-vinyl acetate copolymer (EVA), ethylene-vinyl alcohol-vinyl acetate copolymer (EVA partial saponification product), etc. are all Since the ratio of the amount (mol) of the induced structural units is 20 mol % or more, they are assumed to be of the same type. On the other hand, for example, in propylene-ethylene random copolymers, propylene-ethylene block copolymers, etc., the ratio of the amount (mol) of structural units derived from ethylene to the total amount (mol) of structural units is 20 mol. % is not the same as the above-mentioned low-density polyethylene or the like.
In the present embodiment, the same type of resin preferably has a ratio of the amount (mol) of the common structural unit to the total amount (mol) of the structural unit in either resin, preferably 20 mol% or more, more preferably 30 mol. % or more, more preferably 40 mol % or more, and particularly preferably 50 mol % or more.

In the first resin layer, the content ratio of the polyolefin resin of the same kind as the polyolefin resin contained in the second resin layer with respect to the total mass of the first resin layer is preferably 80 to 100% by mass, and preferably 90 to 90% by mass. It is more preferably 100% by mass, and may be, for example, 95 to 100% by mass or 99 to 100% by mass. When the ratio is equal to or higher than the lower limit, the reusability of the laminated film becomes higher.

The first resin layer is one or two selected from the group consisting of ultra-low density polyethylene, low-density polyethylene, linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene, and metallocene-catalyzed linear ultra-low density polyethylene. When it contains more than 1 species, in the first resin layer, ultra low density polyethylene, low density polyethylene, linear low density polyethylene, metallocene catalyst linear low density polyethylene and metallocene catalyst linear with respect to the total mass of the first resin layer The ratio of the total content of the ultra-low density polyethylene is preferably 70 to 100% by mass, more preferably 80 to 100% by mass, even more preferably 90 to 100% by mass. When the ratio is at least the lower limit, the first resin layer is ultra-low density polyethylene, low-density polyethylene, linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene, or metallocene-catalyzed linear ultra-low density. The effects obtained by including polyethylene are higher.

When the first resin layer contains a polyethylene-based resin and a polypropylene-based resin as two incompatible polyolefins, in the first resin layer, the ratio of the polyethylene-based resin and the polypropylene-based resin to the total mass of the first resin layer The total content ratio is preferably 70 to 100% by mass, more preferably 80 to 100% by mass, even more preferably 90 to 100% by mass. When the proportion is equal to or higher than the lower limit, the effect obtained by the first resin layer containing the polyethylene-based resin and the polypropylene-based resin is further enhanced.

The first resin layer may consist of one layer (single layer), or may consist of a plurality of layers of two or more layers. When the first resin layer consists of multiple layers, these multiple layers may be the same or different, and the combination of these multiple layers is not particularly limited as long as the effects of the present invention are not impaired.

In this specification, not only in the case of the first resin layer, "multiple layers may be the same or different" means "all the layers may be the same or all the layers may be different. "A plurality of layers may be the same, or only some of the layers may be the same." means that

The thickness of the first resin layer can be arbitrarily set according to the application of the laminated film, and is not particularly limited.
The thickness of the first resin layer is generally preferably 5 to 140 μm, more preferably 7.5 to 137.5 μm, even more preferably 10 to 135 μm. When the thickness of the first resin layer is equal to or greater than the lower limit, the strength of the first resin layer is further improved, and the effect of having the first resin layer in the laminated film is more significantly obtained. . Since the thickness of the first resin layer is equal to or less than the upper limit, excessive thickness is suppressed.
When the first resin layer consists of multiple layers, the total thickness of these multiple layers is preferably within the above numerical range.

The ratio of the thickness of the first resin layer to the thickness of the entire laminated film is not particularly limited, but is preferably 3 to 93%, more preferably 5 to 91%, and 7 to 90%. It is even more preferable to have When the ratio is within such a range, the same effect as when the thickness of the first resin layer is within the above range can be obtained.

The first resin layer is preferably a non-stretched layer (film). Since the first resin layer is a non-stretched layer, the moldability of the laminated film is improved.

<Second resin layer>
The second resin layer contains the same polyolefin resin as the polyolefin resin contained in the first resin layer.
The polyolefin-based resin of the same type contained in the second resin layer may be of only one type, or may be of two or more types. It can be selected arbitrarily.

The polyolefin-based resin of the same type contained in the second resin layer is preferably a polyethylene-based resin such as high-density polyethylene, ultra-low-density polyethylene, low-density polyethylene, linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene. More preferably, it is a density polyethylene or a metallocene-catalyzed linear ultra-low density polyethylene. However, if the second resin layer contains ultra-low density polyethylene, low-density polyethylene, linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene, or metallocene-catalyzed linear ultra-low density polyethylene, it further contains high-density polyethylene preferably also contains
That is, the more preferable second resin layer includes, for example, high-density polyethylene, ultra-low-density polyethylene, low-density polyethylene, linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene, and metallocene-catalyzed linear low-density polyethylene. Second resin layer not containing ultra-low-density polyethylene; containing high-density polyethylene and ultra-low-density polyethylene, low-density polyethylene, linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene, and metallocene-catalyzed linear low-density polyethylene and a second resin layer containing one or more selected from the group consisting of ultra-low density polyethylene. Thus, in the second resin layer, high-density polyethylene is an essential component, and ultra-low-density polyethylene, low-density polyethylene, linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene, or metallocene-catalyzed linear ultra-low density polyethylene is used. By adjusting the content of the density polyethylene, the elastic modulus of the second resin layer can be easily adjusted, and as a result, the elastic modulus of the entire laminated film and the moldability of the laminated film can be easily adjusted.
That is, both the first resin layer and the second resin layer preferably contain polyethylene-based resin, more preferably the second resin layer contains high-density polyethylene, and when the second resin layer contains high-density polyethylene, The second resin layer is further selected from the group consisting of ultra-low density polyethylene, low-density polyethylene, linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene, and metallocene-catalyzed linear ultra-low density polyethylene1. It may or may not contain a species or two or more species.

On the other hand, the second resin layer does not contain high-density polyethylene as the polyolefin-based resin of the same type, and contains ultra-low-density polyethylene, low-density polyethylene, linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene, or metallocene-catalyzed linear low-density polyethylene. When chain-shaped ultra-low density polyethylene is contained, the haze of the laminated film measured from the outside on the second resin layer side may be small, which is advantageous in terms of high transparency. That is, the second resin layer is selected from the group consisting of ultra-low density polyethylene, low-density polyethylene, linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene, and metallocene-catalyzed linear ultra-low density polyethylene. It may contain seeds or two or more and may not contain high-density polyethylene.

The second resin layer may contain other components in addition to the polyolefin-based resin of the same kind as the polyolefin-based resin contained in the first resin layer, as long as the effects of the present invention are not impaired.
The other components in the second resin layer include resin components (herein sometimes referred to as "other resin components") and non-resin components (herein, "other non-resin components"). may be referred to as).

The other resin component in the second resin layer is not particularly limited as long as it is a resin other than the polyolefin resin of the same type as the polyolefin resin contained in the first resin layer.
Examples of the other resin component in the second resin layer include a polyolefin resin that is not the same as the polyolefin resin contained in the first resin layer, and a resin other than the polyolefin resin.
Examples of the polyolefin-based resin that is not the same as the polyolefin-based resin included in the first resin layer include the same polyolefin-based resins as the polyolefin-based resin included in the first resin layer.

Examples of the non-resin component in the second resin layer include those similar to the non-resin component in the first resin layer.

The other components contained in the second resin layer may be one type or two or more types, and when there are two or more types, the combination and ratio thereof are arbitrary depending on the purpose. can be selected to

In the second resin layer, the content of the polyolefin resin with respect to the total mass of the second resin layer (polyolefin resin of the same kind as the polyolefin resin contained in the first resin layer and polyolefin resin of the same kind as the first resin layer The total content of the polyolefin resin that is not) is preferably 90 to 100% by mass, more preferably 95 to 100% by mass, for example, 97 to 100% by mass, and 99 to Any of 100 mass % may be sufficient. When the ratio is equal to or higher than the lower limit, the effect of the second resin layer containing the polyolefin resin can be obtained more remarkably.
The ratio is usually the content of the polyolefin resin (polyolefin of the same kind as the polyolefin resin contained in the first resin layer) with respect to the total content (parts by mass) of the components that do not vaporize at room temperature in the second resin composition described later. is the same as the total content of the polyolefin-based resin and the polyolefin-based resin that is not the same as the polyolefin-based resin contained in the first resin layer) (parts by mass).

In the second resin layer, the content ratio of the polyolefin resin of the same kind as the polyolefin resin contained in the first resin layer with respect to the total mass of the second resin layer is preferably 80 to 100% by mass, and preferably 90 to 90% by mass. It is more preferably 100% by mass, and may be, for example, 95 to 100% by mass or 99 to 100% by mass. When the ratio is equal to or higher than the lower limit, the reusability of the laminated film becomes higher.

When the second resin layer contains high-density polyethylene, in the second resin layer, high-density polyethylene, ultra-low-density polyethylene, low-density polyethylene, linear low-density polyethylene, metallocene catalyst direct relative to the total mass of the second resin layer The ratio of the total content of linear low-density polyethylene and metallocene-catalyzed linear ultra-low-density polyethylene is preferably 70 to 100% by mass, more preferably 80 to 100% by mass, and 90 to 100% by mass. % is more preferred. When the ratio is equal to or higher than the lower limit, the heat resistance of the second resin layer and the moldability of the laminated film are significantly improved.

The second resin layer is selected from the group consisting of high-density polyethylene, ultra-low density polyethylene, low-density polyethylene, linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene, and metallocene-catalyzed linear ultra-low density polyethylene. When the second resin layer contains one or two or more types of The ratio of the total content (parts by mass) of the catalyst linear low density polyethylene and the metallocene catalyst linear ultra-low density polyethylene] is preferably 20:80 to 80:20, for example, 20:80 to 60. :40, and 20:80 to 40:60, or 40:60 to 80:20, and 60:40 to 80:20, or 40:60 It may be ~60:40. The greater the total content of ultra-low density polyethylene, low-density polyethylene, linear low-density polyethylene, metallocene-catalyzed linear low-density polyethylene, and metallocene-catalyzed linear ultra-low density polyethylene, the greater the elastic modulus of the second resin layer. , and the elastic modulus of the laminated film as a whole tend to decrease, and the moldability of the laminated film tends to improve.

The second resin layer may be irradiated with an electron beam. That is, the laminated film may be irradiated with an electron beam, and preferably is irradiated with an electron beam from the second resin layer side. For example, even if the second resin layer does not contain high-density polyethylene, the elastic modulus of the second resin layer increases by electron beam irradiation, and as a result, the elastic modulus of the entire laminated film tends to increase. It is in. The reason for this is presumed to be that the electron beam irradiation increases the crosslink density of the resin in the second resin layer.

Preferred electron beam irradiated second resin layers include, for example, an electron beam non-irradiated second resin layer containing either or both of ultra-low density polyethylene and low density polyethylene (in this specification, In order to distinguish the second resin layer in this case from the one after the electron beam irradiation, it may be referred to as an "unirradiated second resin layer".
That is, the laminated film irradiated with an electron beam is preferable, for example, the laminated film including one or both of ultra-low-density polyethylene and low-density polyethylene as the non-irradiated second resin layer. (In this specification, the laminate film in this case may be referred to as an "unirradiated laminate film" in order to distinguish it from the one after electron beam irradiation), but includes those irradiated with electron beams.

In the non-irradiated second resin layer, the ratio of the total content of the ultra-low density polyethylene and the low density polyethylene to the total weight of the non-irradiated second resin layer is preferably 70 to 100 mass%, preferably 80 to 100 % by mass is more preferred, and 90 to 100% by mass is even more preferred. When the ratio is equal to or higher than the lower limit, the effect of electron beam irradiation can be obtained more remarkably.

It is preferable to irradiate the non-irradiated second resin layer or the non-irradiated laminate film with an absorbed dose of 20 to 300 kGy. When the absorbed dose is equal to or higher than the lower limit, the effect of electron beam irradiation can be obtained more remarkably. Excessive cross-linking of the resin in the second resin layer is suppressed when the absorbed dose is equal to or less than the upper limit.
In other words, a preferred laminated film irradiated with an electron beam is one irradiated with an electron beam under the condition of an absorbed dose of 20 to 300 kGy.

The acceleration voltage of the non-irradiated second resin layer or the non-irradiated laminated film when electron beam irradiation is preferably 100 to 300 kV, more preferably 120 to 280 kV, and even more preferably 140 to 260 kV. When the acceleration voltage is equal to or higher than the lower limit, the effect of electron beam irradiation can be obtained more remarkably. Excessive cross-linking of the resin in the second resin layer is suppressed when the acceleration voltage is equal to or less than the upper limit.

The laminate film has, for example, an increased gel fraction due to electron beam irradiation. That is, the gel fraction of the laminate film is greater than the gel fraction of the non-irradiated laminate film.
The gel fraction of the laminated film is preferably 30% or more, and may be, for example, 30 to 90%, 32 to 78%, or 34 to 76%. With such a laminated film, a desired elastic modulus can be easily obtained.

The gel fraction of the laminated film can be measured according to JIS K 6769. That is, the laminated film is immersed in an organic solvent such as xylene, and after drying the remaining insoluble matter without dissolution, the mass is determined, and the weight of the laminated film before dissolution and the insoluble matter derived from the laminated film after drying are calculated. The gel fraction can be calculated from the mass of the product. More specifically, for example, the laminated film of Xg is wrapped in a stainless steel wire mesh of Yg, immersed in a heated organic solvent, and the insoluble matter derived from the laminated film is taken out from the organic solvent together with the stainless steel wire mesh. . Next, the stainless wire mesh enveloping the insoluble matter is dried in a vacuum, and the total mass (Zg) of the dried insoluble matter and the stainless steel wire mesh is measured. The gel fraction of the laminated film is calculated from the following formula (1).
Gel fraction (mass%) of laminated film = (ZY) / X × 100 (1)

The laminate film changes its properties during thermomechanical analysis, for example, by electron beam irradiation.
For example, when a laminated film is subjected to thermomechanical analysis, the temperature at which a displacement of 2000 μm is exhibited (in this specification, it may be abbreviated as “2000 μm displacement temperature”) is preferably 120° C. or higher. , 125 to 200°C, and 130 to 195°C. With such a laminated film, a desired elastic modulus can be easily obtained.

For example, when the laminated film is subjected to thermomechanical analysis, the displacement at a temperature of 100° C. is preferably 500 μm or less, and may be, for example, 50 to 490 μm or 100 to 480 μm or less. With such a laminated film, a desired elastic modulus can be easily obtained.

Thermomechanical analysis of the laminated film is performed, for example, in accordance with JIS K 7196, from the difference in the amount of thermal expansion when the temperature of the standard sample and the target sample is increased at a constant rate, the amount of thermal expansion of the sample is determined. It can be done depending on the method of measurement.

The second resin layer may consist of one layer (single layer), or may consist of a plurality of layers of two or more layers. When the second resin layer consists of multiple layers, these multiple layers may be the same or different, and the combination of these multiple layers is not particularly limited as long as the effects of the present invention are not impaired.

The thickness of the second resin layer can be arbitrarily set according to the application of the laminated film, and is not particularly limited.
The thickness of the second resin layer is usually preferably 5-100 μm, more preferably 5-80 μm, and may be, for example, 5-60 μm. When the thickness of the second resin layer is equal to or greater than the lower limit, the strength of the second resin layer is further improved, and the effect of having the second resin layer in the laminated film is more significantly obtained. . Since the thickness of the second resin layer is equal to or less than the upper limit, excessive thickness is suppressed. Further, when the second resin layer contains high-density polyethylene, the thickness of the second resin layer is equal to or less than the upper limit, so that the elastic modulus of the second resin layer and the elastic modulus of the entire laminated film are small. Therefore, the moldability of the laminated film tends to be improved.
When the second resin layer consists of multiple layers, the total thickness of these multiple layers is preferably within the above numerical range.

The ratio of the thickness of the second resin layer to the thickness of the entire laminated film is not particularly limited, but is preferably 3 to 67%, more preferably 3 to 53%, for example, 3 to 40%. %. When the ratio is within such a range, the same effect as when the thickness of the second resin layer is within the above range can be obtained.

The second resin layer is preferably a non-stretched layer (film). Since the second resin layer is a non-stretched layer, the moldability of the laminated film is improved.

Since the second resin layer has heat resistance, it is suitable, for example, as an outer layer (the outermost layer on the side opposite to the sealant layer side).

<Third resin layer>
The laminated film may further include a third resin layer between the first resin layer and the second resin layer.
The third resin layer contains the same polyolefin resin as the polyolefin resin contained in the first resin layer and the second resin layer. That is, in the laminated film having the third resin layer, the first resin layer, the second resin layer, and the third resin layer contain the same kind of polyolefin resin.

In the present embodiment, not only in the case of polyolefin-based resins, but when resins having a common structural unit are compared with each other, the term "resin of the same type" refers to , means that the ratio of the amount (mole) of common structural units is 20 mol % or more. For example, very low density polyethylene (VLDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), metallocene-catalyzed linear low density polyethylene (mLLDPE), metallocene-catalyzed linear very low density polyethylene (V -mLLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), ethylene-methyl acrylate copolymer (EMA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-ethyl acrylate copolymer (EEA), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-ethyl acrylate-maleic anhydride copolymer (E-EA-MAH), ethylene-vinyl alcohol Copolymer (EVOH), ethylene-vinyl acetate copolymer (EVA), ethylene-vinyl alcohol-vinyl acetate copolymer (EVA partial saponification product), etc. are all Since the ratio of the amount (mol) of the induced structural units is 20 mol % or more, they are assumed to be of the same type. On the other hand, for example, in propylene-ethylene random copolymers, propylene-ethylene block copolymers, etc., the ratio of the amount (mol) of structural units derived from ethylene to the total amount (mol) of structural units is 20 mol. % is not the same as the above-mentioned low-density polyethylene or the like.
In the present embodiment, the same type of resin preferably has a ratio of the amount (mol) of the common structural unit to the total amount (mol) of the structural unit in either resin, preferably 20 mol% or more, more preferably 30 mol. % or more, more preferably 40 mol % or more, and particularly preferably 50 mol % or more.
The laminated film provided with the third resin layer has an effect due to the provision of the third resin layer, and is highly reusable.

Polyolefin resins used in the third resin layer (included in the third resin layer) include elastomer components such as α-olefin copolymers; ethylene-vinyl alcohol copolymers (EVOH); ethylene-vinyl alcohol-vinyl acetate copolymers. (EVA partial saponification product) is also included. A laminated film having a third resin layer containing an elastomer has high pinhole resistance and high strength even if it does not contain a polyamide such as nylon. A laminated film having a third resin layer containing EVOH has high oxygen barrier properties. A partially saponified EVA can be used as an adhesive resin.

Examples of the polyolefin-based resin used in the third resin layer (included in the third resin layer) include modified polyolefins such as acid-modified polyolefins having acidic groups or groups in which the acidic groups have been anhydrided.
Examples of the modified polyolefin include modified ethylene-based copolymers (modified ethylene-based copolymers), modified propylene-based copolymers (modified propylene-based copolymers), and modified butene-based copolymers. (modified butene-based copolymer), acid-modified polyethylene, acid-modified polypropylene, and the like. The modified polyolefin is suitable as an adhesive resin, and the third resin layer containing the modified polyolefin has adhesiveness and is suitable as an adhesive layer.

The polyolefin-based resin of the same type contained in the third resin layer may be of only one type, or may be of two or more types. It can be selected arbitrarily.

The polyolefin-based resin of the same type contained in the third resin layer is preferably a polyethylene-based resin.
That is, it is preferable that all of the first resin layer, the second resin layer, and the third resin layer contain a polyethylene-based resin.

The third resin layer may contain other components in addition to the polyolefin resin of the same type as the polyolefin resin contained in the first resin layer and the second resin layer within a range that does not impair the effects of the present invention.
The other components in the third resin layer include resin components (herein sometimes referred to as "other resin components") and non-resin components (herein, "other non-resin components"). may be referred to as).

The other resin component in the third resin layer is not particularly limited as long as it is a resin other than the polyolefin resin of the same type as the polyolefin resin contained in the first resin layer and the second resin layer.
Examples of the other resin component in the third resin layer include a polyolefin resin that is not the same as the polyolefin resin contained in the first resin layer and the second resin layer, and a resin other than the polyolefin resin.

The polyolefin resin that is not the same as the polyolefin resin contained in the first resin layer and the second resin layer includes the same polyolefin resins as those mentioned above as the polyolefin resin contained in the first resin layer; elastomers such as α-olefin copolymers etc.
The laminated film having the third resin layer containing the elastomer has high pinhole resistance and high strength even if it does not contain a polyamide such as nylon.

Examples of resins other than polyolefin resins in the third resin layer include elastomers such as styrene-ethylene/butylene-ethylene block copolymers.
The laminated film having the third resin layer containing the elastomer has high pinhole resistance and high strength even if it does not contain a polyamide such as nylon.

Examples of the non-resin component in the third resin layer include those similar to the non-resin component in the first resin layer.

The other components contained in the third resin layer may be one type or two or more types, and when there are two or more types, the combination and ratio thereof are arbitrary depending on the purpose. can be selected to

In the third resin layer, the content of the polyolefin resin with respect to the total mass of the third resin layer (polyolefin resin of the same kind as the polyolefin resin contained in the first resin layer and the second resin layer, the first resin layer and the The total content of the polyolefin resin contained in the two resin layers and the polyolefin resin that is not the same type) is preferably 90 to 100% by mass, more preferably 95 to 100% by mass. , 97 to 100 mass %, and 99 to 100 mass %. When the ratio is equal to or higher than the lower limit, the effect of the third resin layer containing the polyolefin resin can be obtained more remarkably.
The ratio is usually the content of the polyolefin-based resin (the polyolefin-based It is the same as the ratio of the total content of the polyolefin resin that is the same as the resin and the polyolefin resin that is not the same as the polyolefin resin contained in the first resin layer and the second resin layer (parts by mass).

In the third resin layer, the content ratio of the polyolefin-based resin of the same kind as the polyolefin-based resin contained in the first resin layer and the second resin layer with respect to the total mass of the third resin layer is 80 to 100% by mass. is preferred, and more preferably 90 to 100% by mass, for example, it may be either 95 to 100% by mass or 99 to 100% by mass. When the ratio is equal to or higher than the lower limit, the reusability of the laminated film becomes higher.

The third resin layer may consist of one layer (single layer), or may consist of a plurality of layers of two or more layers. When the third resin layer consists of multiple layers, these multiple layers may be the same or different, and the combination of these multiple layers is not particularly limited as long as the effects of the present invention are not impaired.
In the third resin layer consisting of multiple layers, all layers contain the same polyolefin resin as the polyolefin resin contained in the first resin layer and the second resin layer.

The thickness of the third resin layer can be arbitrarily set according to the application of the laminated film, and is not particularly limited.
The thickness of the third resin layer is generally preferably 3 to 140 μm, more preferably 4.5 to 137.5 μm, even more preferably 6 to 135 μm. When the thickness of the third resin layer is equal to or greater than the lower limit, the strength of the third resin layer is further improved. In addition, the effect of having the third resin layer in the laminated film can be obtained more remarkably. For example, the properties of the laminated film, such as oxygen barrier properties, pinhole resistance, and interlayer adhesiveness, which will be described later, are enhanced. Since the thickness of the third resin layer is equal to or less than the upper limit, excessive thickness is suppressed.
When the third resin layer consists of multiple layers, the total thickness of these multiple layers is preferably within the above numerical range.

When the laminated film has a third resin layer, the ratio of the thickness of the third resin layer to the thickness of the entire laminated film is not particularly limited, but is preferably 2 to 93%, and It is more preferably 91%, even more preferably 4 to 90%. When the ratio is within such a range, the same effect as when the thickness of the third resin layer is within the above range can be obtained. Further, when the ratio is equal to or less than the upper limit, the effect obtained by providing the laminated film with the first resin layer and the second resin layer is further enhanced.

The third resin layer is preferably an unstretched layer (film). Since the third resin layer is a non-stretched layer, the moldability of the laminated film is improved.

The third resin layer is suitable as, for example, an intermediate layer such as a pinhole resistant layer, an oxygen barrier layer, and an adhesive layer.

A resin layer containing ethylene-vinyl alcohol copolymer (EVOH) has high oxygen barrier properties. Therefore, for example, the laminated film provided with the third resin layer containing ethylene-vinyl alcohol copolymer has high oxygen barrier properties.

The third resin layer has high oxygen barrier properties and moderate pinhole resistance, and the reusability of the laminated film is further enhanced. and an alcohol copolymer, and the polyolefin resin corresponds to any one of an ethylene-vinyl alcohol copolymer, an ethylene-vinyl acetate copolymer, and an ethylene-vinyl alcohol-vinyl acetate copolymer. It is preferably a resin layer (which may be referred to as “resin layer (I)” in this specification).

On the other hand, ethylene-vinyl alcohol copolymers are usually ethylene-vinyl acetate copolymers and ethylene-vinyl alcohol-vinyl acetate copolymers (in other words, ethylene-vinyl acetate copolymers and their partially saponified products). Low compatibility with polyolefin resins that do not fall under any of the above. Therefore, when the third resin layer contains such a polyolefin resin and an ethylene-vinyl alcohol copolymer, the third resin layer contains an ethylene-vinyl alcohol copolymer and ethylene-acetic acid. A vinyl copolymer and a polyolefin resin that does not fall under any of the ethylene-vinyl alcohol-vinyl acetate copolymers (in this specification, may be referred to as "non-vinyl polyolefin resin"). It is preferable that the resin layer further contains a compatible component (which may be referred to herein as a "compatibility-improving component").

Preferred examples of the compatibility-improving component include ethylene-vinyl alcohol-vinyl acetate copolymer (partially saponified ethylene-vinyl acetate copolymer).
That is, the resin layer (I) preferably further contains an ethylene-vinyl alcohol-vinyl acetate copolymer.

In the resin layer (I), the non-vinyl polyolefin resin is the same polyolefin resin as the polyolefin resin contained in the first resin layer and the second resin layer, and is preferably a polyethylene resin.
In the resin layer (I), the ethylene-vinyl alcohol copolymer is preferably the same polyolefin resin as the polyolefin resin contained in the first resin layer and the second resin layer.
When the resin layer (I) contains an ethylene-vinyl alcohol-vinyl acetate copolymer, in the resin layer (I), the ethylene-vinyl alcohol-vinyl acetate copolymer is added to the first resin layer and the second resin layer. It is preferably a polyolefin resin of the same type as the polyolefin resin contained.

In the ethylene-vinyl alcohol copolymer in the resin layer (I), the ratio of the amount (mol) of the structural unit derived from ethylene to the total amount (mol) of the structural units (in the present specification, "ethylene copolymer may be referred to as "polymerization ratio") may be 80 mol% or less, but is preferably 50 mol% or less, for example, 45 mol% or less, 40 mol% or less, 35 mol% or less, and Any of 30 mol % or less may be sufficient. When the ratio is 50 mol% or less, the ratio of the amount (mol) of structural units that can be considered to be derived from vinyl alcohol increases, and the oxygen barrier properties of the resin layer (I) and the laminated film are enhanced. get higher
The lower limit of the ratio of the amount (moles) of the constituent units derived from ethylene is not particularly limited. For example, the ratio of the amount (moles) of the structural units derived from ethylene may be 20 mol % or more.

In the resin layer (I), the content of the ethylene-vinyl alcohol copolymer is preferably 95% by mass or less with respect to the total mass of the resin layer (I). When the laminated film having such a resin layer (I) is used to seal the laminated films, the occurrence of peeling (delamination) at sites other than the first resin layer is highly suppressed when the sealed portion is peeled off. be done. The ratio may be, for example, 90% by mass or less, or 80% by mass or less, in that such effects are enhanced.
The ratio is usually the total content (parts by mass) of the components that do not vaporize at room temperature in the resin composition for forming the resin layer (I) (the third resin composition described later), ethylene-vinyl alcohol It is the same as the ratio of the polymer content (parts by mass).

In the resin layer (I), the lower limit of the ratio of the content of the ethylene-vinyl alcohol copolymer to the total mass of the resin layer (I) is not particularly limited. The ratio is 40% by mass or more in that the effect of using the ethylene-vinyl alcohol copolymer (for example, the effect of increasing the oxygen barrier properties of the resin layer (I) and the laminated film) can be obtained more remarkably. is preferably 45% by mass or more, and even more preferably 50% by mass or more.

In the resin layer (I), the ratio of the content of the ethylene-vinyl alcohol copolymer to the total mass of the resin layer (I) is, for example, 40 to 95% by mass, 40 to 90% by mass, and 40 to 80% by mass. %, 45 to 95% by mass, 45 to 90% by mass, and 45 to 80% by mass, or 50 to 95% by mass, 50 to 90% by mass , and 50 to 80% by mass.

When the resin layer (I) contains an ethylene-vinyl alcohol-vinyl acetate copolymer, the content of the ethylene-vinyl alcohol-vinyl acetate copolymer in the resin layer (I) with respect to the total mass of the resin layer (I) is preferably 5 to 40% by mass, and may be, for example, 10 to 35% by mass. When the ratio is within such a range, the effect of using the ethylene-vinyl alcohol-vinyl acetate copolymer can be obtained more remarkably.
The ratio is usually ethylene-vinyl alcohol- It is the same as the ratio of the content (parts by mass) of the vinyl acetate copolymer.

Regardless of whether the resin layer (I) contains an ethylene-vinyl alcohol-vinyl acetate copolymer, in the resin layer (I), the ethylene-vinyl alcohol copolymer and , The ratio of the total content of the non-vinyl polyolefin resin and the ethylene-vinyl alcohol-vinyl acetate copolymer is preferably 90 to 100% by mass, more preferably 95 to 100% by mass. More preferably, for example, it may be either 97 to 100% by mass or 99 to 100% by mass. When the ratio is at least the lower limit, the oxygen barrier property of the resin layer (I) is further enhanced.
The ratio is usually the total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming the resin layer (I) (the third resin composition described later), ethylene-vinyl alcohol It is the same as the ratio of the total content (parts by mass) of the polymer, the non-vinyl polyolefin resin, and the ethylene-vinyl alcohol-vinyl acetate copolymer.

When the laminated film has the resin layer (I) as the third resin layer, it may have only one resin layer (I), or may have two or more layers. When the laminated film comprises two or more resin layers (I), these two or more resin layers (I) may be the same or different, and the combination of these resin layers (I) may be It is not particularly limited as long as it does not impair the effects of the invention.

As the laminated film having the resin layer (I) as the third resin layer, for example, one layer of the resin layer (I) and the first resin layer side and the second resin layer side of the resin layer (I) One or both of them may include one or two third resin layers other than the resin layer (I).
More specifically, as such a laminated film, for example, a first resin layer, one resin layer (I) (third resin layer), and one or two layers other than the resin layer (I) The third resin layer and the second resin layer are laminated in this order in the thickness direction, and the third resin layer is a total of two or three laminated films; the first resin layer , a third resin layer other than one or two resin layers (I), one resin layer (I) (third resin layer), and a second resin layer, in this order. A laminated film having a total of two or three third resin layers laminated in the longitudinal direction; a first resin layer and one or two third resin layers other than the resin layer (I) , one resin layer (I) (third resin layer), one or two third resin layers other than the resin layer (I), and the second resin layer in this order. A laminated film having a total of 3 to 5 layers of the third resin layer, which is laminated in the direction, may be mentioned.
In the laminated film exemplified here, the first resin layer, the resin layer (I), the third resin layer other than the resin layer (I), and the second resin layer all contain the same polyolefin resin.
In the laminated film exemplified here, each of the first resin layer and the second resin layer may be only one layer, or may be two or more layers.

Preferred among the laminated films are those in which the third resin layer is composed of three or more layers, at least one of which is the resin layer (I), in terms of high oxygen barrier properties. mentioned.
In the third resin layer, which is the resin layer (I), the non-vinyl polyolefin resin, the ethylene-vinyl alcohol copolymer, and, if necessary, the ethylene-vinyl alcohol-vinyl acetate copolymer. and one or more selected from the group consisting of the polyolefin resin contained in the first resin layer and the second resin layer, and the same polyolefin resin.
For example, when the non-vinyl polyolefin resin is the same kind of polyolefin resin, one or both of an ethylene-vinyl alcohol copolymer and an ethylene-vinyl alcohol-vinyl acetate copolymer , It may be the same kind of polyolefin resin, and both the ethylene-vinyl alcohol copolymer and the ethylene-vinyl alcohol-vinyl acetate copolymer may not be the same kind of polyolefin resin. .

In the laminated film having the resin layer (I) as the third resin layer, the ratio of the thickness of the resin layer (I) to the thickness of the laminated film is not particularly limited, but is preferably 4 to 15%. preferable. The resin layer (I) in which the proportion is equal to or higher than the lower limit has higher uniformity of thickness. When the ratio is equal to or less than the upper limit, the reusability of the laminated film becomes higher.

When the laminated film includes the resin layer (I) as the third resin layer, the haze of the laminated film measured from the outside on the second resin layer side is, for example, 35% or less and 30% or less. Although either may be sufficient, it is preferable that it is 20% or less. A laminated film having a haze of equal to or less than the upper limit has higher oxygen barrier properties. This is due to the high uniformity of the resin layer (I) and the high oxygen barrier properties of the resin layer (I). Further, when the haze is equal to or less than the upper limit, the visibility of the contents in the package obtained using the laminated film is improved.
As used herein, "haze" means that measured according to JIS K 7136:2000.

As described above, the resin layer (I) contains an ethylene-vinyl alcohol copolymer and other resins. The oxygen barrier property of the laminated film is enhanced by the addition of On the other hand, a layer composed of an ethylene-vinyl alcohol copolymer or containing an ethylene-vinyl alcohol copolymer as a main component (in this specification, may be referred to as "resin layer (II)"); A layer containing an adhesive resin (in this specification, may be referred to as an "adhesive layer") provided on both sides (both sides of the resin layer (II)), and the laminate provided as a third resin layer The film will have higher oxygen barrier properties. Resins other than the ethylene-vinyl alcohol copolymer are not essential components in the resin layer (II).

Examples of the adhesive resin include the above-described modified polyolefin, ethylene-vinyl alcohol-vinyl acetate copolymer (EVA partially saponified product), ethylene-vinyl acetate copolymer (EVA), and the like.
The modified polyolefin is preferably acid-modified polyethylene, more preferably maleic anhydride-modified polyethylene.

The ethylene-vinyl alcohol copolymer in the resin layer (II) is the same as the ethylene-vinyl alcohol copolymer in the resin layer (I), and the polyolefin resin contained in the first resin layer and the second resin layer and the same kind of polyolefin resin.
When the resin layer (II) contains a resin other than an ethylene-vinyl alcohol copolymer, the resin other than the ethylene-vinyl alcohol copolymer in the resin layer (II) is It is preferably a polyolefin resin of the same type as the polyolefin resin contained.
In the adhesive layer, the adhesive resin is the same polyolefin resin as the polyolefin resin contained in the first resin layer and the second resin layer.
When the adhesive layer contains a resin other than the adhesive resin, the resin other than the adhesive resin in the adhesive layer is the same polyolefin resin as the polyolefin resin contained in the first resin layer and the second resin layer. is preferred.

Examples of the ethylene-vinyl alcohol copolymer in the resin layer (II) include those similar to the ethylene-vinyl alcohol copolymer in the resin layer (I).

In the resin layer (II), the ratio of the content of the ethylene-vinyl alcohol copolymer to the total weight of the resin layer (II) is preferably 90 to 100% by mass, more preferably 95 to 100% by mass. is more preferable, and may be, for example, 97 to 100% by mass or 99 to 100% by mass. When the ratio is at least the lower limit, the effect obtained by using the ethylene-vinyl alcohol copolymer as the main component (for example, the effect of simplifying the structure of the resin layer (II)) is further enhanced, The oxygen barrier property of the resin layer (II) is further enhanced.
The ratio is usually the total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming the resin layer (II) (the third resin composition described later), ethylene-vinyl alcohol It is the same as the ratio of the polymer content (parts by mass).

When the laminated film has the resin layer (II) as the third resin layer, it may have only one resin layer (II), or may have two or more layers. When the laminated film has two or more resin layers (II), these two or more resin layers (II) may be the same or different, and the combination of these resin layers (II) is It is not particularly limited as long as it does not impair the effects of the invention.

When the laminated film has the resin layer (II) as the third resin layer, it is preferable to further have the adhesive layer as the third resin layer on both sides of the resin layer (II). Such a laminated film has high levels of oxygen barrier properties, interlayer adhesion and seal strength. Regarding interlayer adhesion, in particular, the resin layer (II), the two adhesive layers provided on both sides thereof, and the surfaces of the two adhesive layers opposite to the resin layer (II) side are provided. Adhesion between adjacent layers is increased. The adjacent layer may be any one of the first resin layer, the second resin layer and the third resin layer.
Thus, the laminated film having high levels of oxygen barrier properties, interlayer adhesion and seal strength is particularly suitable as a material for packaging such as pouches, which will be described later.

Examples of the resin other than the adhesive resin contained in the adhesive layer include the polyolefin-based resins described above, and polyethylene-based resins are preferable.

In the adhesive layer, the content ratio of the adhesive resin with respect to the total mass of the adhesive layer is preferably 20 to 100% by mass, for example, 40 to 100% by mass, 60 to 100% by mass, and 80 to 100% by mass. Any of 100 mass % may be sufficient. When the ratio is equal to or higher than the lower limit, the adhesiveness of the adhesive layer is further enhanced.
The above ratio is usually the content of the adhesive resin (mass part) is the same as

When the adhesive layer contains an adhesive resin and a resin other than the adhesive resin, in the adhesive layer, the adhesive resin and the other resin other than the adhesive resin with respect to the total mass of the adhesive layer, is preferably 70 to 100% by mass, more preferably 80 to 100% by mass, even more preferably 90 to 100% by mass. When the ratio is equal to or higher than the lower limit, the adhesiveness of the adhesive layer and the effect obtained by using the other resin are enhanced. For example, when the other resin is the polyolefin resin, the adhesiveness of the adhesive layer and the reusability of the laminated film are enhanced.

When the adhesive layer contains an adhesive resin and a resin other than the adhesive resin, in the adhesive layer, [adhesive resin content (parts by mass)]: [other resins other than the adhesive resin content (parts by mass)] is preferably 20:80 to 80:20, for example, 20:80 to 60:40 and 20:80 to 40:60. 40:60 to 80:20, 60:40 to 80:20, or 40:60 to 60:40. As the content of the adhesive resin increases, the adhesiveness of the adhesive layer tends to improve.

The adhesive layer preferably contains, as an adhesive resin, one or more selected from the group consisting of modified polyolefin and ethylene-vinyl alcohol-vinyl acetate copolymer.

When the laminated film has an adhesive layer as the third resin layer, the adhesive layer (for example, each adhesive layer provided on both sides of the resin layer (II)) may be composed of only one layer. Alternatively, it may be composed of two or more layers. When the adhesive layer is composed of two or more layers, these two or more layers may be the same or different, and the combination of these two or more layers is particularly Not limited.

The laminated film including the resin layer (II) and the adhesive layer as the third resin layer includes, for example, the first resin layer, one adhesive layer (third resin layer), and one or two resin layers. Layer (II), one adhesive layer (third resin layer), and a second resin layer are laminated in this order in the thickness direction, and a total of three third resin layers Layer or four-layer laminate film; first resin layer, one adhesive layer (third resin layer), one or two resin layers (II), one adhesive layer (third resin layer ), one or two third resin layers that are neither the resin layer (II) nor the adhesive layer, and the second resin layer are laminated in this order in the thickness direction. In addition, a laminated film having a total of 4 to 6 third resin layers; An adhesive layer (third resin layer), one or two resin layers (II), one adhesive layer (third resin layer), and a second resin layer are arranged in this order. Laminated film composed of a total of 4 to 6 third resin layers laminated in the thickness direction; the first resin layer and one or two layers that are neither the resin layer (II) nor the adhesive layer The third resin layer of the layer, one adhesive layer (third resin layer), one or two resin layers (II), one adhesive layer (third resin layer), and a resin layer ( II) A third resin layer configured by laminating one or two layers of a third resin layer that does not fall under any of II) and an adhesive layer, and a second resin layer in this order in the thickness direction thereof. is a laminated film having 5 to 8 layers in total.
In the laminated film exemplified here, the first resin layer, the adhesive layer, the resin layer (II), the third resin layer that is neither the resin layer (II) nor the adhesive layer, and the second resin layer contains all the same polyolefin resins.
In the laminated film exemplified here, each of the first resin layer and the second resin layer may be only one layer, or may be two or more layers.

In the laminated film having the resin layer (II) as the third resin layer, the ratio of the thickness of the resin layer (II) to the thickness of the laminated film is not particularly limited, but is preferably 3 to 20%. preferable. The resin layer (II) in which the ratio is equal to or higher than the lower limit has higher thickness uniformity. When the ratio is equal to or less than the upper limit, the reusability of the laminated film becomes higher.

In the laminated film having an adhesive layer as the third resin layer, the ratio of the thickness of the adhesive layer (for example, each adhesive layer provided on both sides of the resin layer (II)) to the thickness of the laminated film is Although not particularly limited, it is preferably 1 to 10%. An adhesive layer having a ratio equal to or higher than the lower limit has a higher thickness uniformity. When the ratio is equal to or less than the upper limit, the reusability of the laminated film becomes higher.

When the laminated film includes the resin layer (II) and the adhesive layer as the third resin layer, the haze of the laminated film measured from the outside on the second resin layer side is, for example, 25% or less and 20%. % or less, preferably 17% or less, more preferably 15% or less. A laminated film having a haze of equal to or less than the upper limit has a higher oxygen barrier property. This is because the uniformity of the resin layer (II) is higher and the oxygen barrier property of the resin layer (II) is higher. Further, when the haze is equal to or less than the upper limit, the visibility of the contents in the package obtained using the laminated film is improved.

The oxygen permeation amount of the laminated film under conditions of a temperature of 23° C. and a relative humidity (RH) of 60%, measured in accordance with JIS K 7126-2:2006, is 50 cc/(m ² 24 h atm ) or less, for example, 35 cc/(m ² · 24 h · atm) or less, 25 cc / (m ² · 24 h · atm) or less, 15 cc / (m ² · 24 h · atm) or less, 10 cc / (m ² · 24 h)・atm) or less, and 5 cc/(m ² ·24 h · atm).
On the other hand, the oxygen permeation amount of the laminated film is 0 cc/(m ² ·24 h·atm) or more.
That is, the oxygen permeation amount of the laminated film is 0 to 50 cc/(m ² · 24 h · atm), 0 to 35 cc / (m ² · 24 h · atm), 0 to 25 cc / (m ² · 24 h · atm), 0 to 15 cc/(m ² ·24 h·atm), 0 to 10 cc/(m ² ·24 h·atm), and 0 to 5 cc/(m ² ·24 h·atm).

In particular, when the laminated film has a resin layer (II) and an adhesive layer as the third resin layer, the temperature measured in accordance with JIS K 7126-2:2006, temperature 23 ° C., relative humidity (RH) 60 %, the oxygen permeation amount of the laminated film is preferably 0 to 5 cc/(m ² ·24 h·atm).

The amount of oxygen permeation of the laminated film can be adjusted by adjusting the type of the component contained, the amount of the contained component, the thickness, etc., in any one of the layers constituting the laminated film.
For example, as described above, by configuring the laminated film with the third resin layer containing EVOH, the oxygen permeation amount of the laminated film can be easily reduced. However, this is only an example, and the adjustment of the oxygen permeation amount of the laminated film can also be performed by adjusting other layers.

In the laminated film, each layer (the first resin layer, the second resin layer, and, in some cases, the third resin layer) that constitutes the film contains the same kind of polyolefin resin, so that it is highly reusable. Instead, each layer can be adhered without an adhesive layer intervening. That is, the laminated film has high adhesion between layers even if it does not have an adhesive layer. In addition, such a laminated film having no adhesive layer can be manufactured at low cost.
On the other hand, since the laminated film includes the resin layer (II) and the adhesive layer as the third resin layer, it has high levels of oxygen barrier properties, interlayer adhesion, and seal strength.

In the laminated film, the ratio of the content of the same kind of polyolefin resin to the total weight of the laminated film is preferably 90% by mass or more, more preferably 92% by mass or more, and 95% by mass. It is more preferable that it is above. When the ratio is equal to or higher than the lower limit, the laminated film can be made into a monomaterial (the laminated film is made of a single material), and the laminated film as a whole can be easily reused.

When the laminated film is subjected to dynamic viscoelasticity measurement (DMA), the elastic modulus E _F '(110) at 110° C. when the vibration frequency is 1 Hz is, for example, 3.0×10 ⁷ Pa or less. However, it is preferably 2.1×10 ⁷ Pa or less. When E _F '(110) is 2.1×10 ⁷ Pa or less, the moldability of the laminated film becomes higher, and for example, the thickness uniformity of the molded body becomes higher.
The lower limit of E _F '(110) is not particularly limited. For example, a laminate film having E _F '(110) of 1.0×10 ⁶ Pa or more can be formed more easily.

The laminate film for dynamic viscoelasticity measurement, that is, the test piece of the laminate film has a width of 4 mm and a length of 5 cm or more. Using such a test piece, the test piece is placed so that the length of the measurement target site for dynamic viscoelasticity measurement is 2 cm, and the test piece is heated at a heating rate of 3 ° C./min. It is preferable to perform the dynamic viscoelasticity measurement. Under such conditions, E _F ′(110) can be measured with higher accuracy.

When measuring dynamic viscoelasticity, the length direction (perpendicular to the width direction) of the laminated film (test piece) to be measured may be aligned with the flow direction (MD) of the resin of the laminated film. , may coincide with the direction (TD) perpendicular to the flow direction (MD) of the resin of the laminated film.
In this embodiment, it is preferable that the length direction of the laminated film (test piece) coincides with the flow direction (MD) of the resin of the laminated film during the dynamic viscoelasticity measurement. That is, the above E _F '(110) is measured when the length direction of the laminated film (test piece) coincides with the flow direction (MD) of the resin of the laminated film during dynamic viscoelasticity measurement. value is preferred.

E _F '(110) can be adjusted by adjusting the type of component, the amount of the component, the thickness, or the like in any one of the layers constituting the laminated film. Further, as described above, E _F ′(110) can be more easily adjusted by adjusting the elastic modulus of the second resin layer.

FIG. 1 is a cross-sectional view schematically showing an example of the laminated film of this embodiment.
The laminated film 1 shown here includes a first resin layer 11 and a second resin layer 12, and further includes a third resin layer 13 between the first resin layer 11 and the second resin layer 12. It is That is, the laminated film 1 is configured by laminating the first resin layer 11, the third resin layer 13 and the second resin layer 12 in this order in the thickness direction thereof.
The first resin layer 11, the second resin layer 12 and the third resin layer 13 are all described above.
The third resin layer 13 has an arbitrary configuration, and the laminated film 1 does not have to include the third resin layer 13 .

One surface 11b of the first resin layer 11 (the surface opposite to the second resin layer 12 side, sometimes referred to as the "second surface" in this specification) 11b is an exposed surface.
One surface 12a of the second resin layer 12 (the surface opposite to the first resin layer 11 side, sometimes referred to as "first surface" in this specification) 12a is an exposed surface.

The oxygen permeation amount of the laminated film 1 is 50 cc/(m ² ·24 h·atm) or less.

FIG. 2 is a cross-sectional view schematically showing another example of the laminated film of this embodiment.
The laminated film 2 shown here has, as the third resin layer 23, a 3-1 resin layer 231, a 3-2 resin layer 232, and a The 3-3 resin layer 233 is laminated in this order in the thickness direction to form a laminated resin layer having a three-layer structure.
That is, the laminated film 2 includes the first resin layer 11, the 3-1 resin layer 231, the 3-2 resin layer 232, the 3-3 resin layer 233, and the second resin layer 12. These layers are laminated in order in the thickness direction.

The laminate film 2 is the same as the laminate film 1 except that the third resin layer 23 is provided instead of the third resin layer 13 .

In the third resin layer 23, the 3-1 resin layer 231 and the 3-3 resin layer 233 are neither the resin layer (I) nor the resin layer (II). is preferably The third-2 resin layer 232 is preferably the resin layer (I) or the resin layer (II), that is, a resin layer having oxygen barrier properties.
That is, as the third resin layer 23, for example, the 3-1 resin layer 231 and the 3-3 resin layer 233 are both the resin layer (I) and the resin layer (II). , and the 3-2 resin layer 232 is the resin layer (I).
More preferably, the third resin layer 23 is, for example, the 3-1 resin layer 231 and the 3-3 resin layer 233, which are both the resin layer (I) and the resin layer (II). A third resin layer having an oxygen barrier property, in which the 3-2 resin layer 232 is the resin layer (II), which is a resin layer that does not correspond to any of the above, is also exemplified. All of the -3 resin layers 233 may be adhesive layers.

In the laminated film 2, the third resin layer 23 may be a laminated resin layer other than the three-layer structure.
For example, the third resin layer 23 has a two-layer structure without the 3-1 resin layer 231, and the 3-2 resin layer 232 is the resin layer (I) or the resin layer (II). good too. In the third resin layer having such a two-layer structure, the layer on the first resin layer 11 side is referred to as the 3-1 resin layer, and the 3-1 resin layer is the resin layer (I) or the resin layer (II) may be used, and the layer on the side of the second resin layer 12 is referred to as the 3-2 resin layer. The laminated film 2 having such a third resin layer is referred to as "Modification 2-1" in this specification. In this specification, not only the laminated film 2 but also the laminated film having two or more third resin layers, the third resin layer closest to the first resin layer is the third resin layer 3-1. It is called a resin layer.
For example, the third resin layer 23 has a two-layer structure without the 3-3 resin layer 233, and the 3-2 resin layer 232 is the resin layer (I) or the resin layer (II). good too. The laminated film 2 having such a third resin layer is referred to as "Modification 2-2" in this specification.
For example, the third resin layer 23 further includes one or more layers similar to the 3-1 resin layer 231 on the first resin layer 11 side of the 3-1 resin layer 231. 3-2 The resin layer 232 is the resin layer (I) or the resin layer (II), and may have a multi-layer structure with four or more layers. In the third resin layer having such a multilayer structure, the layer closest to the first resin layer 11 is the 3-1 resin layer. The laminated film 2 having such a third resin layer is referred to as "Modification 2-3" in this specification.
For example, the third resin layer 23 further includes one or more layers similar to the 3-3 resin layer 233 on the second resin layer 12 side of the 3-3 resin layer 233. 3-2 The resin layer 232 is the resin layer (I) or the resin layer (II), and may have a multi-layer structure with four or more layers. In the third resin layer having such a multilayer structure, the layer on the side of the second resin layer 12 that is in contact with the 3-3 resin layer 233 is called the 3-4 resin layer. The laminated film 2 having such a third resin layer is referred to as "Modification 2-4" in this specification.
When the third resin layer 23 is a laminated resin layer other than the three-layer structure, the laminated film 2 may have both the configurations of the modified examples 2-1 and 2-4, or may have the configurations of the modified examples 2-1 and 2-4. It may have both the configurations of Modification 2-2 and Modification 2-3, or may have the configurations of Modification 2-3 and Modification 2-4. For example, as an example of a laminated film having both the configurations of Modification 2-3 and Modification 2-4, a first resin layer, a 3-1 resin layer, a 3-2 resin layer, A laminate configured by laminating the 3-3 resin layer, the 3-4 resin layer, the 3-5 resin layer, and the second resin layer one by one in this order in the thickness direction film.
In this way, in the laminated film 2 having a large number of layers and including the third resin layer, each layer may be regarded as a separate layer.

The laminated film may include other layers that do not correspond to any of the first resin layer, the second resin layer, and the third resin layer within a range that does not impair the effects of the present invention. , preferably without said other layer.
The other layer is a layer that does not contain a polyolefin resin, and by not including such another layer, the reusability of the laminated film is further enhanced.

Although the total thickness of the laminated film is not particularly limited, it is preferably 50 to 350 μm, for example.

In the laminated film, all layers (for example, the first resin layer to the third resin layer) constituting the laminated film are preferably non-stretched layers (films). Such a non-stretched laminated film is particularly excellent in formability, and is suitable for forming, for example, a deep-drawn package.
The laminated film (eg, unstretched laminated film) is not limited to deep-drawn packaging, and is also suitable for constructing other forms of packaging, such as pouches.
The type of package constructed using the laminated film can be arbitrarily selected according to the purpose.

<<Method for manufacturing laminated film>>
The laminated film can be produced, for example, by using several extruders to melt-extrude a resin or resin composition, which is a material for forming each layer, by a feed block method, a co-extrusion T-die method such as a multi-manifold method, or an air-cooled method. Alternatively, it can be produced by a water-cooled co-extrusion inflation method or the like.

When the resin composition is used, for example, a blend of two or more components (dry blended product, non-kneaded product) may be directly fed into an extruder as a resin composition, or two or more A pre-kneaded product obtained by kneading the components in advance may be fed into the extruder as a resin composition.
The pre-kneaded material is obtained by, for example, melt-kneading two or more components using an apparatus such as a twin-screw extruder or a Banbury mixer.

In addition, in the laminated film, two or more films for constituting two or more layers of them are prepared separately in advance and laminated by a thermal (heat) lamination method or the like without using an adhesive. It can also be produced by laminating layers together, and, if necessary, further laminating layers other than these layers so as to obtain the desired arrangement form.

The type and content of the components contained in the resin composition, which is a material for forming any layer in the laminated film, are adjusted so that the layer to be formed contains the target component at the target content. and manufacture it. For example, the content ratio of the components that do not vaporize at room temperature in the resin composition is usually the same as the content ratio of the components in the layer formed from the resin composition.

A resin composition for forming the first resin layer (in the laminated film 1 shown in FIG. 1 and the laminated film 2 shown in FIG. 2, the first resin layer 11) (in this specification, "first resin composition ”) includes, for example, those containing the polyolefin-based resin and, if necessary, other components. The other ingredients are the ingredients described above.

A resin composition for forming the second resin layer (in the laminated film 1 shown in FIG. 1 and the laminated film 2 shown in FIG. 2, the second resin layer 12) (in the present specification, the "second resin composition ”) includes, for example, those containing the polyolefin-based resin and, if necessary, other components. The other ingredients are the ingredients described above.

Third resin layer (in the laminated film 1 shown in FIG. 1, the third resin layer 13; in the laminated film 2 shown in FIG. 2, the 3-1 resin layer 231, the 3-2 resin layer 232, and the third The resin composition for forming the -3 resin layer 233) (which may be referred to herein as a "third resin composition") includes, for example, the polyolefin resin and, if necessary, Other components other than and those containing. The other ingredients are the ingredients described above. In particular, among the 3-1 resin layer 231 to the 3-3 resin layer 233, the third resin composition for forming the resin layer (I) includes an ethylene-vinyl alcohol copolymer and , the non-vinyl polyolefin resin, optionally an ethylene-vinyl alcohol-vinyl acetate copolymer, and optionally other components. Among the 3-1 resin layer 231 to the 3-3 resin layer 233, the third resin composition for forming the resin layer (II) includes an ethylene-vinyl alcohol copolymer, Depending on the circumstances, resins other than ethylene-vinyl alcohol copolymers and, if necessary, other components may be included. Among the 3-1 resin layer 231 to the 3-3 resin layer 233, the third resin composition for forming the adhesive layer includes an adhesive resin and, if necessary, a resin other than an adhesive resin. and, if necessary, other components other than these.

<< package >>
The laminated film is suitable as a material for packaging.
That is, preferred packaging bodies include those constructed using the laminated film.
The package of the present embodiment can be manufactured by packaging an object to be packaged using the laminated film. When manufacturing the package, the first resin layer in the laminated film may be arranged on the side of the object to be packaged, and the second resin layer may be arranged on the side opposite to the side of the object to be packaged to package the object. preferable.

For example, the laminated film is suitable for a deep-drawn package, and suitable for constituting both the lid material and the bottom material of the deep-drawn package. In particular, the laminated film, which has good formability, is suitable for forming a bottom member having a concave portion for forming a storage portion.

FIG. 3 is a cross-sectional view schematically showing an example of a package provided with the laminated film of this embodiment.
A package 101 shown here includes a lid member 8 and a bottom member 10, and is a deep-drawn package obtained by deep-drawing a resin film.
Either one or both of the lid member 8 and the bottom member 10 are configured using the laminated film 1 shown in FIG. 1 or the laminated film 2 shown in FIG.
In the lid member 8 or the bottom member 10 in FIG. 3, distinction of each layer in the laminated film 1 or laminated film 2 constituting this is omitted.

A recess 100 is formed in the bottom member 10 .
One surface 10b of the area excluding the recess 100 of the bottom material 10 (herein sometimes referred to as the "second surface") and one surface of the lid material 8 (herein referred to as the "second surface") 8b, which may be referred to as "two surfaces", are both seal surfaces and face each other.
The package 101 is configured by sealing the lid member 8 and the bottom member 10 . More specifically, the second surface 10b of the bottom member 10 excluding the recessed portion 100 and the second surface 8b of the lid member 8 are overlapped and sealed in the vicinity of their peripheral edges. As a result, a storage portion 101a is formed between the second surface 10b of the bottom member 10 and the second surface 8b of the lid member 8 in the region of the recess 100 of the bottom member 10 . A stored item 9 is stored in the storage portion 101a.

When the bottom material 10 is configured using the laminated film 1 or the laminated film 2, one surface (second surface) 10b of the bottom material 10 is the first resin layer 11 in the laminated film 1 or laminated film 2. It is preferably the same as the second surface 11b. The other surface 10a of the bottom material 10 (which may be referred to herein as the “first surface”) is the same as the first surface 12a of the second resin layer 12 in the laminated film 1 or laminated film 2. Preferably.

When the lid member 8 is configured using the laminated film 1 or laminated film 2, one surface (second surface) 8b of the lid member 8 is the first resin layer 11 in the laminated film 1 or laminated film 2. It is preferably the same as the second surface 11b. The other surface 8a of the lid member 8 (in this specification, sometimes referred to as the “first surface”) is the same as the first surface 12a of the second resin layer 12 in the laminated film 1 or laminated film 2. Preferably.

Regardless of whether the bottom material 10 is configured using the laminated film 1 or the laminated film 2, the layer having one surface (second surface) 10b of the bottom material 10 (in other words, one outermost layer) It may be a sealant layer, a non-easy-peel sealant layer, or an easy-peel layer (easy-peel sealant layer).
Regardless of whether the lid material 8 is configured using the laminated film 1 or the laminated film 2, the layer having one surface (second surface) 8b (in other words, one outermost layer) of the lid material 8 is It may be a sealant layer, a non-easy-peel sealant layer, or an easy-peel layer (easy-peel sealant layer).
Both the layer having one side 10b of the bottom material 10 and the layer having one side 8b of the lid material 8 may be easy peel layers, but are they both non-easy peel sealant layers? Or preferably one is a non-easy peel sealant layer and the other is an easy peel layer. When one of the layer having one surface 10b of the bottom material 10 and the layer having one surface 8b of the lid material 8 is a non-easy peel sealant layer and the other is an easy peel layer Preferably, the layer having one side 10b of the bottom material 10 is an easy peel layer, and the layer having one side 8b of the lid material 8 is a non-easy peel type sealant layer.

As a more preferable package 101, the bottom material 10 may be configured using the laminated film 1 or the laminated film 2, and the lid member 8 may be configured using the laminated film 1 or the laminated film 2. It may be configured using a resin film other than the laminated film of the embodiment, and the layer having one surface 10b of the bottom material 10 (that is, the first resin layer 11) is a non-easy peel sealant layer and Any of the easy-peel layers may be used, and a packaging body in which the layer having one side 8b of the lid material 8 is a non-easy-peel sealant layer is exemplified.

As a more preferable package 101, both the bottom material 10 and the lid material 8 are configured using the laminated film 1 or the laminated film 2 because the package 101 has the highest reusability. The layer having one side 10b of the lid material 8 (i.e., the first resin layer 11) may be either a non-easy-peel sealant layer or an easy-peel layer, and the layer having one side 8b of the lid material 8 (i.e. , the first resin layer 11) is a non-easy-peel sealant layer.

That is, a more preferable packaging body having easy peelability comprises a lid material and a bottom material, the package body is configured by sealing the lid material and the bottom material, and the lid material and the bottom material are both , wherein the laminated film is configured using the laminated film, the first resin layer in the laminated film constituting the bottom material is an easy peel layer, and the laminated film constituting the lid material is is a non-easy-peel sealant layer.

In FIG. 3 , in the storage portion 101 a of the package 101 , there are some gaps between the contents 9 and the bottom material 10 and between the contents 9 and the lid material 8 . The existence of the gap is not essential in the package 101 in which the article 9 is stored.

Both the thickness of the flat part of the bottom material 10 and the thickness of the lid material 8 may be the same as the thickness of the laminated film 1 or the laminated film 2 described above.

Up to this point, a deep-drawn package has been described as an example of a package provided with the laminated film, but the package provided with the laminated film is not limited to the deep-drawn package, and other packages. (For example, a pouch or the like).

FIG. 4 is a cross-sectional view schematically showing another example of a package provided with the laminated film of this embodiment.
The packaging body 102 shown here includes a first resin film 6 and a second resin film 7, and regions near the peripheral edge portions of these resin films are sealed.
Either one or both of the first resin film 6 and the second resin film 7 are configured using the laminated film 1 shown in FIG. 1 or the laminated film 2 shown in FIG.
In the first resin film 6 or the second resin film 7 in FIG. 4, the distinction of each layer in the laminated film 1 or laminated film 2 constituting this is omitted.

One surface of the first resin film 6 (in this specification, sometimes referred to as "second surface") 6b and one surface of the second resin film 7 (in this specification, referred to as "second surface") ) 7b are both sealing surfaces, which are opposed to each other.
The package 102 is configured by sealing the first resin film 6 and the second resin film 7 . More specifically, of the second surface 6b of the first resin film 6, the area near the peripheral edge of the first resin film 6, and of the second surface 7b of the second resin film 7, the second resin film 7 is overlapped and sealed with the region near the periphery of the . As a result, the storage part 102a is formed between the unsealed area of the second surface 6b of the first resin film 6 and the unsealed area of the second surface 7b of the second resin film 7. there is A stored item 9 is stored in the storage portion 102a.

When the first resin film 6 is configured using the laminated film 1 or laminated film 2, one surface (second surface) 6b of the first resin film 6 is the first surface in the laminated film 1 or laminated film 2. It is preferably the same as the second surface 11 b of the resin layer 11 . The other surface 6a of the first resin film 6 (sometimes referred to as the “first surface” in this specification) is the first surface 12a of the second resin layer 12 in the laminated film 1 or laminated film 2. preferably the same.

When the second resin film 7 is configured using the laminated film 1 or laminated film 2, one surface (second surface) 7b of the second resin film 7 is the first surface in the laminated film 1 or laminated film 2. It is preferably the same as the second surface 11 b of the resin layer 11 . The other surface 7a of the second resin film 7 (in this specification, may be referred to as the “first surface”) is the first surface 12a of the second resin layer 12 in the laminated film 1 or laminated film 2. preferably the same.

Regardless of whether the first resin film 6 is configured using the laminated film 1 or the laminated film 2, a layer having one surface (second surface) 6b of the first resin film 6 (in other words, one of the most surface layer) is a sealant layer, which may be a non-easy-peel sealant layer or an easy-peel layer (easy-peel sealant layer).
Regardless of whether the second resin film 7 is configured using the laminated film 1 or the laminated film 2, the layer having one surface 7b of the second resin film 7 (in other words, one outermost layer) contains the sealant It may be a non-easy-peel sealant layer or an easy-peel layer (easy-peel sealant layer).
Both the layer having one side 6b of the first resin film 6 and the layer having one side 7b of the second resin film 7 may be easy peel layers, but both are non-easy peel sealants. or one is a non-easy peel sealant layer and the other is an easy peel layer.

As a more preferable package 102, one of the first resin film 6 and the second resin film 7 is configured using the laminated film 1 or the laminated film 2, and the other is configured using the laminated film 1 or the laminated film 2. It may be configured using a resin film other than the laminated film of the present embodiment, and among the first resin film 6 and the second resin film 7, the laminated film 1 or The layer having the one side (second side) (that is, the first resin layer 11), which is configured using the laminated film 2, is either a non-easy peel sealant layer or an easy peel layer. Alternatively, the layer having the one surface (second surface) of the remaining resin film may be a non-easy-peel sealant layer.

As a more preferable packaging body 102, both the first resin film 6 and the second resin film 7 are configured using the laminated film 1 or the laminated film 2 because the packaging body 102 has the highest reusability. , The layer having the one surface (second surface) of either the first resin film 6 or the second resin film 7 (that is, the first resin layer 11) is a non-easy peel sealant layer and an easy peel The other of the first resin film 6 and the second resin film 7, the layer having the one surface (second surface) (that is, the first resin layer 11) is a non-easy peel A wrapper that is a mold sealant layer is included.

In FIG. 4 , in the storage portion 102 a of the package 102 , there are some gaps between the stored item 9 and the second resin film 7 and between the stored item 9 and the first resin film 6 . However, the presence of these gaps is not essential in the package 102 in which the article 9 is stored.

Each of the thicknesses of the first resin film 6 and the second resin film 7 may be the same as the thickness of the laminated film 1 or the laminated film 2 described above.

So far, the package of the present embodiment is configured using the laminated film 1 or the laminated film 2, but the package of the present embodiment consists of the laminated film 1 and the laminated film 2. It may be constructed using another laminated film according to an embodiment of the present invention, which does not correspond to any of the above.

<<Manufacturing Method>>
In the packaging body, for example, the laminated films, or the laminated film and a resin film other than the laminated film form a storage portion for storing an object to be packaged (in other words, an object to be stored). The film can be manufactured by storing the objects to be packaged while the film is being packed, and heat-sealing the regions of the film other than the storage portion.

The present invention will be described in more detail below with reference to specific examples. However, the present invention is by no means limited to the examples shown below.

[Example 1]
<<Production of laminated film>>
A laminated film having the configuration shown in FIG. 2 was manufactured by the procedure shown below.
That is, low-density polyethylene (LDPE) (“UBE Polyethylene (registered trademark) F222NH” manufactured by Ube Maruzen Polyethylene Co., Ltd., density 0.922 g/cm ³ ) was used as the resin constituting the first resin layer and the 3-2 resin layer. prepared.
High-density polyethylene (HDPE) (“Nipolon Hard (registered trademark) 4010” manufactured by Tosoh Corporation, density 0.964 g/cm ³ , melt mass flow rate 5.4 g/10 min) was prepared as a resin constituting the second resin layer.
As the resin constituting the 3-1 resin layer and the 3-3 resin layer, metallocene-catalyzed linear low-density polyethylene (mLLDPE) ("Umerit (registered trademark) 1520F" manufactured by Ube Maruzen Polyethylene Co., Ltd., density 0.913 g) /cm ³ ) were prepared.
As resins constituting the 3-2 resin layer, ethylene-vinyl alcohol-vinyl acetate copolymer (EVA partially saponified product) (“Mersen (registered trademark)-H3051R” manufactured by Tosoh Corporation) and ethylene-vinyl alcohol copolymer A coalescence (EVOH) (“EVAL (registered trademark) E173B” manufactured by Kuraray Co., Ltd., ethylene copolymerization ratio: 44 mol %) was prepared. In this specification, this EVOH may be referred to as "EVOH (1)".

A third resin composition (1) was prepared by mixing the EVOH (1) (60 parts by mass), the LDPE (10 parts by mass), and the partially saponified EVA (30 parts by mass). .

By co-extrusion of the LDPE, the mLLDPE, the third resin composition (1), the mLLDPE, and the HDPE in this order, a first resin layer (30 μm thick) and a third -1 resin layer (thickness 37.5 μm), 3-2 resin layer (thickness 7.5 μm), 3-3 resin layer (thickness 45 μm), and second resin layer (thickness 30 μm) A laminated film (thickness: 150 μm) was obtained by laminating these in this order in the thickness direction.
The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.

<<Evaluation of laminated film>>
<Measurement of oxygen permeation amount of laminated film>
Regarding the laminated film obtained above, the oxygen permeation amount was measured under conditions of a temperature of 23° C. and a relative humidity of 60% in accordance with JIS K 7126-2:2006. Table 1 shows the results.

<Measurement of sealing strength of laminated film>
The laminated films obtained above were faced to each other so that the first resin layers faced each other, and the MDs of these (laminated films) were matched, and the sealing temperature was 140 ° C., the sealing pressure was 0.2 MPa, It was heat-sealed under the conditions of a sealing time of 2.0 seconds. Next, a test piece was produced by cutting a region with a width of 15 mm from the heat-sealed portion of the obtained product (the cut product was used as a test piece). At this time, the longitudinal direction of the test piece was aligned with the MD of the laminated film.
For this test piece, according to JIS Z 0238: 1998, the peeling speed is set to 300 mm / min, the peeling direction is matched with the MD of the laminated film in the test piece, and the laminated films are peeled. The measured value of strength was adopted as the seal strength (N/15 mm) of the laminated film. Table 1 shows the results.

<Evaluation of moldability of laminated film>
Using a deep drawing machine ("R535" manufactured by MULTIVAC), under the following molding conditions, recesses (pockets) are formed in the laminated film obtained above and deep drawing is performed to produce six compacts. bottom.
[Molding condition]
Molding temperature: 100-120°C
Heating time: 1.5 seconds Molding time: 2.0 seconds Mold size used: Width 110 mm, length 150 mm, depth 30 mm, three of the four corners have a radius of curvature of 10 mm, and the remaining one has a radius of curvature of 10 mm. Curvature radius is 35mm

For 3 of the 6 molded bodies obtained, the thickness at the four corners of these recesses was measured using a micrometer, and the moldability of the laminated film was evaluated according to the following criteria. Table 1 shows the results.
[Evaluation criteria]
A: The thinnest portion has a thickness of 20 µm or more, and the moldability is excellent.
B: The thinnest portion has a thickness of 15 μm or more and less than 20 μm, and the moldability is good.
C: The thickness of the thinnest portion is less than 15 μm, and the formability is poor.

<Measurement of E _F '(110) of laminated film>
A test piece (1) having a length of 15 cm and a width of 4 mm was cut out from the laminated film obtained above. At this time, the length direction of the test piece (1) was aligned with the flow direction (MD) of the resin of the laminated film. Then, this test piece (1) was placed in the sample holder so that the length of the measurement target site was 2 cm.
Then, using a dynamic viscoelasticity measuring device ("DMA 7100" manufactured by Hitachi High-Tech Science), in compliance with JIS K7244-4, in a tensile mode, in a temperature range of 25 ° C. to 135 ° C., displacement 10 μm, vibration The dynamic viscoelasticity of the laminated film (specimen (1)) was measured under the conditions of a frequency of 1 Hz and a heating rate of 3°C/min to measure E _F '(110). Table 1 shows the results.

<Measurement of haze of laminated film>
The haze of the laminated film obtained above was measured from the outside on the second resin layer side in accordance with JIS K 7136:2000. Table 1 shows the results.

<<Production and Evaluation of Laminated Film>>
[Example 2]
The first resin layer (thickness 30 μm), the 3-1 resin layer (thickness 45 μm), and the third -2 resin layer (thickness 7.5 μm), 3-3 resin layer (thickness 52.5 μm), and second resin layer (thickness 15 μm) are laminated in this order in the thickness direction A laminated film (thickness: 150 μm) was obtained. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 1 shows the results.

[Example 3]
The first resin layer (thickness 30 μm), the 3-1 resin layer (thickness 52.5 μm), and the The 3-2 resin layer (thickness 7.5 μm), the 3-3 resin layer (thickness 52.5 μm), and the second resin layer (thickness 7.5 μm) are arranged in this order. A laminated film (thickness: 150 μm) was obtained which was laminated in the longitudinal direction. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 1 shows the results.

[Example 4]
A second resin composition (1) was prepared by mixing the HDPE (50 parts by mass) and the mLLDPE (50 parts by mass).
Then, in the same manner as in Example 2, except that this second resin composition (1) was used instead of HDPE, the first resin layer (thickness: 30 μm) and the 3-1 resin A layer (45 μm thick), a 3-2 resin layer (7.5 μm thick), a 3-3 resin layer (52.5 μm thick), and a second resin layer (15 μm thick) A laminated film (thickness: 150 μm) was obtained by laminating these films in this order in the thickness direction. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 1 shows the results.

[Example 5]
A second resin composition (2) was prepared by mixing the HDPE (75 parts by mass) and the mLLDPE (25 parts by mass).
Then, in the same manner as in Example 2, except that the second resin composition (2) was used instead of HDPE, the first resin layer (thickness: 30 μm) and the 3-1 resin A layer (45 μm thick), a 3-2 resin layer (7.5 μm thick), a 3-3 resin layer (52.5 μm thick), and a second resin layer (15 μm thick) A laminated film (thickness: 150 μm) was obtained by laminating these films in this order in the thickness direction. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 1 shows the results.

[Example 6]
A second resin composition (3) was prepared by mixing the HDPE (25 parts by mass) and the mLLDPE (75 parts by mass).
Then, in the same manner as in Example 2, except that the second resin composition (3) was used instead of the HDPE, the first resin layer (thickness: 30 μm) and the 3-1 resin A layer (45 μm thick), a 3-2 resin layer (7.5 μm thick), a 3-3 resin layer (52.5 μm thick), and a second resin layer (15 μm thick) A laminated film (thickness: 150 μm) was obtained by laminating these films in this order in the thickness direction. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 2 shows the results.

[Example 7]
The same second resin composition (1) as in Example 4 was prepared.
The first resin layer (thickness: 30 μm) and the 3-1 resin layer (thickness: 30 μm) and the 3-1 resin layer ( 52.5 μm thick), a 3-2 resin layer (7.5 μm thick), a 3-3 resin layer (52.5 μm thick), and a second resin layer (7.5 μm thick). However, a laminated film (thickness: 150 μm) was obtained by laminating these in this order in the thickness direction. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 2 shows the results.

[Example 8]
A second resin composition (4) was prepared by mixing the HDPE (50 parts by mass) and the LDPE (50 parts by mass).
Then, in the same manner as in Example 4, except that this second resin composition (4) was used instead of the second resin composition (1), a first resin layer (thickness: 30 μm) was formed. , the 3-1 resin layer (thickness 45 μm), the 3-2 resin layer (thickness 7.5 μm), the 3-3 resin layer (thickness 52.5 μm), and the second resin layer ( A laminated film (thickness: 150 μm) was obtained by laminating two films (thickness: 15 μm) in this order in the thickness direction. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 2 shows the results.

[Example 9]
An ethylene-vinyl alcohol copolymer (EVOH) (“GH3804B” manufactured by Mitsubishi Chemical Corporation, 38 mol % ethylene copolymerization ratio) was prepared as a resin constituting the 3-2 resin layer. In this specification, this EVOH may be referred to as "EVOH (2)".
A third resin composition (2) was prepared by mixing the EVOH (2) (60 parts by mass), the LDPE (10 parts by mass), and the partially saponified EVA (30 parts by mass). .
Then, in the same manner as in Example 2, except that this third resin composition (2) was used instead of the third resin composition (1), a first resin layer (30 μm thick) , the 3-1 resin layer (thickness 45 μm), the 3-2 resin layer (thickness 7.5 μm), the 3-3 resin layer (thickness 52.5 μm), and the second resin layer ( A laminated film (thickness: 150 μm) was obtained by laminating two films (thickness: 15 μm) in this order in the thickness direction. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 2 shows the results.

[Example 10]
An ethylene-vinyl alcohol copolymer (EVOH) (“EVAL (registered trademark) J171B” manufactured by Kuraray Co., Ltd., ethylene copolymerization ratio: 32 mol %) was prepared as a resin constituting the 3-2 resin layer. In this specification, this EVOH may be referred to as "EVOH (3)".
A third resin composition (3) was prepared by mixing the EVOH (3) (60 parts by mass), the LDPE (10 parts by mass), and the partially saponified EVA (30 parts by mass). .
Then, in the same manner as in Example 2, except that this third resin composition (3) was used instead of the third resin composition (1), a first resin layer (30 μm thick) , the 3-1 resin layer (thickness 45 μm), the 3-2 resin layer (thickness 7.5 μm), the 3-3 resin layer (thickness 52.5 μm), and the second resin layer ( A laminated film (thickness: 150 μm) was obtained by laminating two films (thickness: 15 μm) in this order in the thickness direction. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 2 shows the results.

[Example 11]
The mLLDPE, the third resin composition (3), the mLLDPE, and the HDPE are coextruded in this order to form a first resin layer (thickness: 75 μm) and a 3-1 resin layer. (thickness 7.5 μm), the 3-2 resin layer (thickness 52.5 μm), and the second resin layer (thickness 15 μm) are laminated in this order in the thickness direction. A laminated film (thickness: 150 μm) was obtained. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 3 shows the results.

[Example 12]
In the same manner as in Example 11, except that the third resin composition (1) was used instead of the third resin composition (3) when forming the 3-1 resin layer, the 1 resin layer (75 μm thick), 3-1 resin layer (7.5 μm thick), 3-2 resin layer (52.5 μm thick), and 2nd resin layer (15 μm thick) However, a laminated film (thickness: 150 μm) was obtained by laminating these in this order in the thickness direction. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 3 shows the results.

[Example 13]
An ethylene-vinyl alcohol copolymer (EVOH) (“EVAL (registered trademark) L171B” manufactured by Kuraray Co., Ltd., ethylene copolymerization ratio: 27 mol %) was prepared as a resin constituting the 3-1 resin layer. In this specification, this EVOH may be referred to as "EVOH (4)".
A third resin composition (4) was prepared by mixing the EVOH (4) (60 parts by mass), the LDPE (10 parts by mass), and the partially saponified EVA (30 parts by mass). .
Then, in the same manner as in Example 11, except that this third resin composition (4) was used instead of the third resin composition (3), a first resin layer (75 μm thick) , the 3-1 resin layer (thickness 7.5 μm), the 3-2 resin layer (thickness 52.5 μm), and the second resin layer (thickness 15 μm) in this order. A laminated film (thickness: 150 μm) was obtained which was laminated in the longitudinal direction. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 3 shows the results.

[Example 14]
A third resin composition (5) was prepared by mixing the EVOH (4) (50 parts by mass), the LDPE (25 parts by mass), and the partially saponified EVA (25 parts by mass). .
Then, in the same manner as in Example 11, except that this third resin composition (5) was used instead of the third resin composition (3), a first resin layer (thickness: 75 μm) , the 3-1 resin layer (thickness 7.5 μm), the 3-2 resin layer (thickness 52.5 μm), and the second resin layer (thickness 15 μm) in this order. A laminated film (thickness: 150 μm) was obtained which was laminated in the longitudinal direction. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 3 shows the results.

[Example 15]
A third resin composition (6) was prepared by mixing the EVOH (4) (70 parts by mass), the LDPE (15 parts by mass), and the partially saponified EVA (15 parts by mass). .
Then, in the same manner as in Example 11, except that this third resin composition (6) was used instead of the third resin composition (3), a first resin layer (75 μm thick) , the 3-1 resin layer (thickness 7.5 μm), the 3-2 resin layer (thickness 52.5 μm), and the second resin layer (thickness 15 μm) in this order. A laminated film (thickness: 150 μm) was obtained which was laminated in the longitudinal direction. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 3 shows the results.

[Example 16]
A third resin composition (7) was prepared by mixing the EVOH (4) (40 parts by mass), the LDPE (30 parts by mass), and the partially saponified EVA (30 parts by mass). .
The third resin composition (7) was used in place of the third resin composition (3), and the conditions for co-extrusion of the resins were changed as in Example 11. In the same manner, the first resin layer (thickness 75 μm), the 3-1 resin layer (thickness 10.5 μm), the 3-2 resin layer (thickness 49.5 μm), and the second resin layer ( A laminated film (thickness: 150 μm) was obtained by laminating two films (thickness: 15 μm) in this order in the thickness direction. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 4 shows the results.

[Example 17]
The first resin layer (thickness 112.5 μm) and the 3-1 resin layer (thickness 7.5 μm) were formed in the same manner as in Example 13, except that the conditions for co-extrusion of the resins were changed. , a 3-2 resin layer (15 μm thick), and a second resin layer (15 μm thick) laminated in this order in the thickness direction of these laminated films (150 μm thick). Obtained. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 4 shows the results.

[Example 18]
As a resin constituting the 3-1 resin layer and the 3-3 resin layer, maleic anhydride-modified polyethylene (adhesive resin, "NF536" manufactured by Mitsui Chemicals, Inc.) was prepared. In this specification, this maleic anhydride-modified polyethylene may be referred to as "modified PE".
The mLLDPE, the modified PE, the EVOH (4), the modified PE, and the HDPE are coextruded in this order to form a first resin layer (thickness: 112.5 μm) and a third -1 resin layer (thickness 7.5 μm), 3-2 resin layer (thickness 7.5 μm), 3-3 resin layer (thickness 7.5 μm), second resin layer (thickness 15 μm) were laminated in this order in the thickness direction to obtain a laminated film (thickness 150 μm). The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 4 shows the results.

[Example 19]
The first resin layer (thickness: 120 μm), the 3-1 resin layer (thickness: 3.75 μm), and the The 3-2 resin layer (thickness 7.5 μm), the 3-3 resin layer (thickness 3.75 μm), and the second resin layer (thickness 15 μm) are arranged in this order in the thickness direction. A laminated film (thickness: 150 μm) was obtained. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 4 shows the results.

[Example 20]
A third resin composition (8) was prepared by mixing the modified PE (75 parts by mass) and the mLLDPE (25 parts by mass).
Then, in the same manner as in Example 18, except that the third resin composition (8) was used instead of the modified PE, the first resin layer (thickness: 112.5 μm) and the third -1 resin layer (thickness 7.5 μm), 3-2 resin layer (thickness 7.5 μm), 3-3 resin layer (thickness 7.5 μm), second resin layer (thickness 15 μm) were laminated in this order in the thickness direction to obtain a laminated film (thickness 150 μm). The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 4 shows the results.

[Example 21]
A third resin composition (9) was prepared by mixing the modified PE (50 parts by mass) and the mLLDPE (50 parts by mass).
Then, in the same manner as in Example 18, except that the third resin composition (9) was used instead of the modified PE, the first resin layer (thickness: 112.5 μm) and the third -1 resin layer (thickness 7.5 μm), 3-2 resin layer (thickness 7.5 μm), 3-3 resin layer (thickness 7.5 μm), second resin layer (thickness 15 μm) were laminated in this order in the thickness direction to obtain a laminated film (thickness 150 μm). The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 5 shows the results.

[Example 22]
A third resin composition (10) was prepared by mixing the modified PE (25 parts by mass) and the mLLDPE (75 parts by mass).
Then, in the same manner as in Example 18, except that this third resin composition (10) was used instead of the modified PE, the first resin layer (thickness: 112.5 μm), -1 resin layer (thickness 7.5 μm), 3-2 resin layer (thickness 7.5 μm), 3-3 resin layer (thickness 7.5 μm), second resin layer (thickness 15 μm) were laminated in this order in the thickness direction to obtain a laminated film (thickness 150 μm). The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 5 shows the results.

[Example 23]
The first resin layer (thickness 97.5 μm) and the 3-1 resin layer (thickness 7.5 μm) were formed in the same manner as in Example 21, except that the conditions for co-extrusion of the resins were changed. , the 3-2 resin layer (thickness 7.5 μm), the 3-3 resin layer (thickness 7.5 μm), and the second resin layer (thickness 30 μm) in this order. A laminated film (thickness: 150 μm) was obtained which was laminated in the longitudinal direction. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 5 shows the results.

[Example 24]
In the same manner as in Example 21 except that the mLLDPE was used instead of the HDPE, the first resin layer (thickness 112.5 μm) and the 3-1 resin layer (thickness 7.5 μm) ), the 3-2 resin layer (thickness 7.5 μm), the 3-3 resin layer (thickness 7.5 μm), and the second resin layer (thickness 15 μm) in this order. A laminated film (thickness: 150 μm) was obtained which was laminated in the thickness direction. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 5 shows the results.

[Example 25]
A first resin layer (thickness: 63.75 µm) was formed in the same manner as in Example 21, except that the mLLDPE was used instead of the HDPE and the conditions for co-extrusion of the resin were changed. , the 3-1 resin layer (thickness 7.5 μm), the 3-2 resin layer (thickness 7.5 μm), the 3-3 resin layer (thickness 7.5 μm), and the second resin layer (thickness 63.75 μm) were laminated in this order in the thickness direction to obtain a laminated film (thickness 150 μm). The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 5 shows the results.

[Example 26]
By co-extrusion of the mLLDPE, the third resin composition (9), the EVOH (4), the third resin composition (9), the mLLDPE, and the HDPE in this order , the first resin layer (thickness 67.5 μm), the 3-1 resin layer (thickness 7.5 μm), the 3-2 resin layer (thickness 7.5 μm), and the 3-3 resin layer (thickness 7.5 μm), the third-fourth resin layer (thickness 45 μm), and the second resin layer (thickness 15 μm) are laminated in this order in the thickness direction. A film (150 μm thick) was obtained. This laminated film corresponds to the laminated film of Modified Example 2-4 in which the 3rd and 4th resin layers are further provided in the laminated film having the configuration shown in FIG. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, the 3-4 resin layer, and the second resin layer are all unstretched layers is.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 6 shows the results.

[Example 27]
The first resin layer (thickness: 112.5 μm) and the 3-1 resin layer (thickness: 7.5 μm thick), the 3-2 resin layer (7.5 μm thick), the 3-3 resin layer (7.5 μm thick), and the 2nd resin layer (15 μm thick). A laminated film (thickness: 150 μm) was obtained by laminating these in order in the thickness direction. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 6 shows the results.

[Example 28]
A third resin composition (11) was prepared by mixing the partially saponified EVA (50 parts by mass) and the mLLDPE (50 parts by mass).
Then, in the same manner as in Example 18, except that this third resin composition (11) was used instead of the modified PE, the first resin layer (thickness: 112.5 μm), -1 resin layer (thickness 7.5 μm), 3-2 resin layer (thickness 7.5 μm), 3-3 resin layer (thickness 7.5 μm), second resin layer (thickness 15 μm) were laminated in this order in the thickness direction to obtain a laminated film (thickness 150 μm). The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 6 shows the results.

[Example 29]
The first resin layer (thickness 112.5 μm) and the 3-1 resin layer (thickness 7.5 μm) were formed in the same manner as in Example 27 except that the mLLDPE was used instead of the HDPE. ), the 3-2 resin layer (thickness 7.5 μm), the 3-3 resin layer (thickness 7.5 μm), and the second resin layer (thickness 15 μm) in this order. A laminated film (thickness: 150 μm) was obtained which was laminated in the thickness direction. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 6 shows the results.

[Example 30]
As the resin constituting the first resin layer and the 3-2 resin layer, metallocene-catalyzed linear ultra-low density polyethylene (V-mLLDPE) ("Umerit (registered trademark) 0520F" manufactured by Ube Maruzen Polyethylene Co., Ltd., density 0.904 g) /cm ³ ) were prepared.
The first resin layer (thickness 112.5 μm) and the 3-1 resin layer (thickness 7 .5 μm), the 3-2 resin layer (thickness 15 μm), and the second resin layer (thickness 15 μm) are laminated in this order in the thickness direction of these laminated films (thickness 150 μm) was obtained. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 6 shows the results.

[Example 31]
The first resin layer (thickness: 112.5 μm) and 3-1 resin layer (thickness 7.5 μm), 3-2 resin layer (thickness 7.5 μm), 3-3 resin layer (thickness 7.5 μm), and 2nd resin layer ( A laminated film (thickness: 150 μm) was obtained by laminating two films (thickness: 15 μm) in this order in the thickness direction. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 7 shows the results.

[Example 32]
As the resin constituting the first resin layer and the second resin layer, the first resin layer (thickness 63 .75 μm), the 3-1 resin layer (thickness 7.5 μm), the 3-2 resin layer (thickness 7.5 μm), the 3-3 resin layer (thickness 7.5 μm), A laminated film (thickness: 150 μm) was obtained by laminating the second resin layer (thickness: 63.75 μm) in this order in the thickness direction. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 7 shows the results.

[Example 33]
The first resin layer (thickness: 112.5 μm) and the 3-1 resin layer were prepared in the same manner as in Example 21, except that the EVOH (1) was used instead of the EVOH (4). (thickness 7.5 μm), the 3-2 resin layer (thickness 7.5 μm), the 3-3 resin layer (thickness 7.5 μm), and the second resin layer (thickness 15 μm) , to obtain a laminated film (thickness: 150 μm) composed by laminating them in the thickness direction in this order. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 7 shows the results.

[Example 34]
A first resin composition (1) was prepared by mixing the mLLDPE (50 parts by mass) and the LDPE (50 parts by mass).
Then, the first resin layer (thickness 67.5 μm) and the third- 1 resin layer (thickness 7.5 μm), 3-2 resin layer (thickness 7.5 μm), 3-3 resin layer (thickness 7.5 μm), and 3-4 resin layer (thickness 45 μm thick) and a second resin layer (15 μm thick) were laminated in this order in the thickness direction to obtain a laminated film (150 μm thick). The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, the 3-4 resin layer, and the second resin layer are all unstretched layers is.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 7 shows the results.

[Example 35]
The first resin composition (1), the mLLDPE, the third resin composition (9), the EVOH (4), the third resin composition (9), the mLLDPE, and the HDPE By co-extrusion in this order, the first resin layer (thickness 30 μm), the 3-1 resin layer (thickness 37.5 μm), and the 3-2 resin layer (thickness 7.5 μm ), the 3-3 resin layer (thickness 7.5 μm), the 3-4 resin layer (thickness 7.5 μm), the 3-5 resin layer (thickness 45 μm), and the second resin layer (thickness 15 μm) were laminated in this order in the thickness direction to obtain a laminated film (thickness 150 μm). This laminated film has the structure of the modified example 2-3 and the modified example 2-4 in which the 3-4 resin layer and the 3-5 resin layer are further provided in the laminated film having the structure shown in FIG. It corresponds to a laminated film with 1st resin layer, 3-1 resin layer, 3-2 resin layer, 3-3 resin layer, 3-4 resin layer, 3-5 resin layer, and 2nd resin layer are both unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 7 shows the results.

[Example 36]
The first resin composition (1) is further used as the second resin composition (5), and the second resin composition (5) is used instead of the HDPE, and the conditions at the time of resin co-extrusion The first resin layer (thickness 30 μm), the 3-1 resin layer (thickness 35 μm), and the 3-2 resin layer (thickness 7.5 μm), the 3-3 resin layer (thickness 7.5 μm), the 3-4 resin layer (thickness 7.5 μm), and the 3-5 resin layer (thickness 32.5 μm) , and a second resin layer (thickness: 30 μm) were laminated in this order in the thickness direction to obtain a laminated film (thickness: 150 μm). 1st resin layer, 3-1 resin layer, 3-2 resin layer, 3-3 resin layer, 3-4 resin layer, 3-5 resin layer, and 2nd resin layer are both unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 8 shows the results.

[Example 37]
The first resin layer (thickness 15 μm), the 3-1 resin layer (thickness 50 μm), the third resin layer (thickness 50 μm), and the third -2 resin layer (thickness 7.5 μm), 3-3 resin layer (thickness 7.5 μm), 3-4 resin layer (thickness 7.5 μm), 3-5 resin layer ( 47.5 μm thick) and a second resin layer (15 μm thick) were laminated in this order in the thickness direction to obtain a laminated film (150 μm thick). 1st resin layer, 3-1 resin layer, 3-2 resin layer, 3-3 resin layer, 3-4 resin layer, 3-5 resin layer, and 2nd resin layer are both unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 8 shows the results.

[Example 38]
As a resin constituting the first resin layer, homopolypropylene (hPP) ("Sumitomo Noblen FS2011DG2" manufactured by Sumitomo Chemical Co., Ltd., melting point 158°C) was prepared.
A first resin composition (2) was prepared by mixing the LDPE (75 parts by mass) and the hPP (25 parts by mass).
The first resin composition (2), the mLLDPE, the third resin composition (9), the EVOH (4), the third resin composition (9), and the HDPE are combined into this By co-extrusion in order, the first resin layer (thickness 10.5 μm), the 3-1 resin layer (thickness 97.5 μm), and the 3-2 resin layer (thickness 7.5 μm) , the 3-3 resin layer (thickness 7.5 μm), the 3-4 resin layer (thickness 7.5 μm), and the second resin layer (thickness 19.5 μm) in this order. A laminated film (thickness: 150 μm) was obtained which was laminated in the thickness direction. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, the 3-4 resin layer, and the second resin layer are all unstretched layers is.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 9 shows the results.

[Example 39]
The same method as in Example 35 except that the first resin composition (2) was used instead of the first resin composition (1) and the conditions for co-extrusion of the resins were changed. Then, the first resin layer (thickness 10.5 μm), the 3-1 resin layer (thickness 52.5 μm), the 3-2 resin layer (thickness 7.5 μm), and the 3-3 resin layer (thickness 7.5 μm), 3-4 resin layer (thickness 7.5 μm), 3-5 resin layer (thickness 45 μm), and second resin layer (thickness 19.5 μm) However, a laminated film (thickness: 150 μm) was obtained by laminating these in this order in the thickness direction. 1st resin layer, 3-1 resin layer, 3-2 resin layer, 3-3 resin layer, 3-4 resin layer, 3-5 resin layer, and 2nd resin layer are both unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 9 shows the results.

[Example 40]
As resins constituting the first resin layer, ethylene-methacrylic acid copolymer (EMAA) ("Nucrel N0903HC" manufactured by Mitsui Dow Polychemical Co., Ltd.) and propylene-ethylene random copolymer (rPP) (manufactured by Sumitomo Chemical Co., Ltd. "Sumitomo Noblen S131") was prepared.
A first resin composition (3) was prepared by mixing the EMAA (35 parts by mass) and the rPP (65 parts by mass).
A first resin layer (thickness: 10.5 μm) was prepared in the same manner as in Example 38, except that the first resin composition (3) was used instead of the first resin composition (2). , the 3-1 resin layer (thickness 97.5 μm), the 3-2 resin layer (thickness 7.5 μm), the 3-3 resin layer (thickness 7.5 μm), and the 3- A laminated film (thickness: 150 μm) was obtained by laminating 4 resin layers (thickness: 7.5 μm) and the second resin layer (thickness: 19.5 μm) in this order in the thickness direction. rice field. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, the 3-4 resin layer, and the second resin layer are all unstretched layers is.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 9 shows the results.

[Example 41]
The first resin layer (thickness: 10.5 μm) and the third -1 resin layer (thickness 97.5 μm), 3-2 resin layer (thickness 7.5 μm), 3-3 resin layer (thickness 7.5 μm), 3-4 resin layer ( 7.5 μm thick) and a second resin layer (19.5 μm thick) were laminated in this order in the thickness direction to obtain a laminated film (150 μm thick). The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, the 3-4 resin layer, and the second resin layer are all unstretched layers is.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 9 shows the results.

[Example 42]
A first resin layer (thickness: 10.5 μm) was prepared in the same manner as in Example 41, except that the first resin composition (3) was used instead of the first resin composition (2). , the 3-1 resin layer (thickness 97.5 μm), the 3-2 resin layer (thickness 7.5 μm), the 3-3 resin layer (thickness 7.5 μm), and the 3- A laminated film (thickness: 150 μm) was obtained by laminating 4 resin layers (thickness: 7.5 μm) and the second resin layer (thickness: 19.5 μm) in this order in the thickness direction. rice field. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, the 3-3 resin layer, the 3-4 resin layer, and the second resin layer are all unstretched layers is.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 9 shows the results.

[Comparative Example 1]
In the same manner as in Example 11, except that the third resin composition (7) was used instead of the third resin composition (3), a first resin layer (75 μm thick), The 3-1 resin layer (thickness 7.5 μm), the 3-2 resin layer (thickness 52.5 μm), and the second resin layer (thickness 15 μm) are arranged in this order in the thickness direction. A laminated film (thickness: 150 μm) was obtained. The first resin layer, the 3-1 resin layer, the 3-2 resin layer, and the second resin layer are all unstretched layers.
Then, this laminated film was evaluated in the same manner as in Example 1. Table 10 shows the results.

[Comparative Example 2]
<<Production of laminated film>>
The LDPE was prepared as the resin constituting the sealant layer.
The above-mentioned mLLDPE was prepared as the resin constituting the intermediate layer.
The HDPE was prepared as the resin constituting the outer layer.

By coextrusion of the LDPE, the mLLDPE, and the HDPE in this order, a sealant layer (thickness of 30 μm), an intermediate layer (thickness of 90 μm), and an outer layer (thickness of 30 μm) are formed. A laminated film (thickness: 150 μm) was obtained by laminating these in order in the thickness direction. The sealant layer, the intermediate layer, and the outer layer are all unstretched layers.

<<Evaluation of laminated film>>
The laminated film obtained above was evaluated in the same manner as in Example 1. Table 10 shows the results.
In Table 10, for convenience, the sealant layer, the intermediate layer and the outer layer are shown as the first resin layer, the 3rd-3rd resin layer and the second resin layer, respectively.

<<Production and Evaluation of Laminated Film>>
[Comparative Example 3]
By extruding the HDPE, an unstretched monolayer film (thickness: 150 µm) composed of HDPE was obtained.
Then, this monolayer film was evaluated in the same manner as in Example 1. Table 10 shows the results.
In addition, in Table 10, this single layer film is shown as the second resin layer for convenience.

[Comparative Example 4]
By extruding the mLLDPE, an unstretched monolayer film (thickness: 150 µm) composed of mLLDPE was obtained.
Then, this monolayer film was evaluated in the same manner as in Example 1. Table 10 shows the results.
In addition, in Table 10, this single layer film is shown as the 3-3 resin layer for convenience.

As is clear from the above results, in Examples 1 to 42, the laminated film was the first resin layer, the second resin layer and the third resin layer (3-1 resin layer, 3-2 resin layer and 3 -3 resin layer, 3-1 resin layer and 3-2 resin layer, 3-1 resin layer, 3-2 resin layer, 3-3 resin layer and 3-4 resin layer, or 3 -1 resin layer, 3-2 resin layer, 3-3 resin layer, 3-4 resin layer and 3-5 resin layer), the first resin layer, the second resin layer and the third resin layer However, it contained PE or an ethylene-based copolymer (that is, a polyethylene-based resin), and the main component was the same kind of polyolefin-based resin, and was highly recyclable. Furthermore, in Examples 1 to 42, the amount of oxygen permeation of the laminated film was 45 cc/(m ² · 24 h · atm) or less (0.6 to 45 cc / (m ² · 24 h · atm)), and the laminated film was high in oxygen barrier properties.

From the comparison of Examples 2, 9 and 10, and the comparison of Examples 11 to 13, the ratio of the amount (mol) of structural units derived from ethylene to the total amount (mol) of structural units in EVOH is small ( In other words, the higher the ratio of the amount (moles) of structural units that can be considered to be derived from vinyl alcohol to the total amount (moles) of the structural units in EVOH, the more the oxygen barrier properties of the laminated film tend to improve. I was able to confirm something.
Also, from a comparison of Examples 13 to 15, it was confirmed that the higher the EVOH content in the third resin layer (3-1 resin layer), the more the oxygen barrier properties of the laminated film tend to improve. did it.

In Examples 1 to 42, the moldability of the laminated film was good. In Examples 1 to 42, E _F '(110) of the laminated film was 2.6×10 ⁷ Pa or less (1×10 ⁶ to 2.6×10 ⁷ Pa). Among them, in Examples 2 to 22, 24 to 37, 41, and 42, the moldability of the laminated film was particularly excellent, and in these examples, E _F '(110) of the laminated film was 1.5 × It was 10 ⁷ Pa or less (1×10 ⁶ to 1.5×10 ⁷ Pa). In Examples 38 to 40, the formability of the laminate film was particularly excellent, and in these examples, E _F ′(110) of the laminate film was 1.7×10 ⁷ Pa.
From the comparison of Examples 2 and 4 to 6, the ratio of the HDPE content (parts by mass) to the total mass (parts by mass) of the second resin layer in the second resin layer is smaller, more specifically , [HDPE content (parts by mass)]:[mLLDPE content (parts by mass)], the smaller the HDPE content ratio (in other words, the larger the mLLDPE content ratio), It was confirmed that the formability of the laminated film tends to improve.
On the other hand, from the comparison of Examples 1 to 3, it was confirmed that the moldability of the laminated film tends to be improved when the ratio of the thickness of the second resin layer to the thickness of the entire laminated film is smaller. .

From a comparison of Examples 1 to 10 and Examples 11 to 28, it was found that the sealing strength of the laminated film tends to improve when the main component of the first resin layer is mLLDPE rather than LDPE. I was able to confirm that it was in
From the comparison between Example 13 and Example 17, it was confirmed that the higher the ratio of the thickness of the first resin layer to the thickness of the entire laminated film, the higher the sealing strength of the laminated film. .

From the comparison of Example 26 and Example 34, even when the main components of the first resin layer are not mLLDPE but mLLDPE and LDPE, the content of mLLDPE is a certain amount or more, so that the first resin layer It was confirmed that the same degree of seal strength of the laminated film can be obtained as when the main component of is mLLDPE.
From the comparison between Example 34 and Examples 35 to 37, when the main components of the first resin layer are mLLDPE and LDPE, even if the thickness of the first resin layer is reduced, the thickness of the 3-1 resin layer It was confirmed that the sealing strength of the laminated film, which is equivalent to that obtained when the first resin layer is thick, can be obtained by using mLLDPE as the main component. Further, from a comparison of Examples 35 to 36 and Example 37, even if the thickness of the first resin layer is further reduced, the thickness of the 3-1 resin layer is increased, so that the laminated film has the same thickness. It was confirmed that the seal strength was obtained.

In Examples 38 to 42, the seal strength of the laminated film is 4.5 N/15 mm or less (2.5 to 4.5 N/15 mm), and the seal strength of the laminated film in Examples 1 to 37 (14 to 46 N/15 mm). The first resin layers in Examples 1 to 37 are suitable as non-easy-peel sealant layers, whereas the first resin layers in Examples 38 to 42 contain two incompatible polyolefins. , was suitable as an easy-peel sealant layer (easy-peel layer).

From the comparison of Examples 18 and 19, the ratio of the thickness of each of the 3-1 resin layer and the 3-3 resin layer to the thickness of the entire laminated film is small, that is, the modification in the laminated film It was confirmed that even when the content of PE decreased and the content of polyethylene increased, the overall properties of the laminated film remained good.
From the comparison between Example 18 and Examples 20 to 22, in the 3-1 resin layer and the 3-3 resin layer, even if the content of modified PE is reduced and the content of polyethylene is increased, lamination It was confirmed that the general properties of the film remained good.

From the comparison between Example 21 and Example 23, when the constituent material of the second resin layer is HDPE, the ratio of the thickness of the first resin layer to the thickness of the entire laminated film is small, and the thickness of the second resin layer is reduced. It was confirmed that the haze of the laminated film increases as the thickness ratio increases. Further, when comparing Example 23 and Example 1, in which the ratio of the thickness of the second resin layer is the same, it is found that, based on the difference in the constituent material of the third resin layer (especially the 3-2 resin layer), the It was confirmed that the haze of the laminated film of No. 23 was still smaller than that of Example 1.
From the comparison between Example 21 and Example 24, it was confirmed that the haze of the laminated film was reduced by changing the constituent material of the second resin layer from HDPE to mLLDPE.
From the comparison between Examples 35 and 36, it was confirmed that the haze of the laminated film tends to be reduced by replacing HDPE with mLLDPE or LDPE as the constituent material of the second resin layer.
From the comparison of Examples 24 and 25, even if the ratio of the thickness of each of the first layer and the second layer with respect to the thickness of the entire laminated film changes, there is almost no change in the overall properties of the laminated film. was able to confirm.

From the comparison between Example 21 and Example 26, it was confirmed that the laminated film provided with the 3-4 resin layer exhibited good properties similar to the laminated film not provided with the 3-4 resin layer. .

The 3-1 resin layer containing the partially saponified EVA composition alone, as in Example 27, rather than the 3-1 resin layer containing a composition of partially saponified EVA, as in Examples 13-17, etc. Having one resin layer improved the oxygen barrier properties of the laminated film.
From the comparison of Examples 27 and 28, even if part of the EVA partially saponified product is replaced with mLLDPE in the 3-1 resin layer and the 3-3 resin layer, the oxygen barrier property of the laminated film, including It was confirmed that there was almost no change in various physical properties.

From a comparison of Examples 17, 21, 25, or 27 and Examples 29 to 32, even when the V-mLLDPE was used instead of mLLDPE or HDPE as a constituent material of any layer, lamination It was confirmed that the properties of the film were maintained in good condition.

From the comparison between Example 21 and Example 33, when the constituent material of the 3-2 resin layer is EVOH, the lower the ethylene copolymerization ratio in EVOH (in other words, the higher the vinyl alcohol copolymerization ratio method) was confirmed to increase the oxygen barrier property of the laminated film. Also, even if the copolymerization ratio of ethylene (in other words, the copolymerization ratio of vinyl alcohol) in EVOH, which is the constituent material of the 3-2 resin layer, changes, the various physical properties of the laminated film other than the oxygen barrier properties do not change. It was confirmed that there was almost no

From the comparison between Example 35 and Example 36, it was found that E _F '(110) of the laminated film is smaller when the second resin layer is made of LDPE or mLLDPE than when HDPE is used. It could be confirmed.

On the other hand, in Comparative Examples 1 to 4, the laminated film or the single-layer film had a large amount of oxygen permeation, and the laminated film or the single-layer film had a low oxygen barrier property.
In Comparative Example 1, the proportion of the EVOH content in the third resin layer (3-1 resin layer) in the laminated film was small. The laminated film of Comparative Example 1 differs from the laminated film of Example 16 only in that the thickness of the 3-1 resin layer is thin (thickness of the 3-2 resin layer is thick). , it was confirmed that the oxygen barrier property also differs due to this difference in thickness.
In Comparative Examples 2 to 4, the laminated film or monolayer film did not have a layer corresponding to the oxygen barrier layer.

INDUSTRIAL APPLICABILITY The present invention can be reused after use, and can be used for the production of various packages that are required to have oxygen barrier properties.

DESCRIPTION OF SYMBOLS 1, 2... Laminated film 11... 1st resin layer 12... 2nd resin layer 13, 23... 3rd resin layer 101... Package (deep drawing package)
DESCRIPTION OF SYMBOLS 102... Package body 8... Lid material 9... Storage object 10... Bottom material

Claims (15)

A laminated film,
The laminated film comprises a first resin layer and a second resin layer,
The first resin layer and the second resin layer contain the same type of polyolefin resin,
The oxygen permeation amount of the laminated film under conditions of a temperature of 23 ° C. and a relative humidity of 60%, measured in accordance with JIS K 7126-2:2006, is 50 cc / (m ² · 24 h · atm) or less. Laminated film. 2. The laminate film has an elastic modulus E _F '(110) of 3.0×10 ⁷ Pa or less at 110° C. when the vibration frequency is 1 Hz when dynamic viscoelasticity measurement is performed. Laminated film according to. The laminated film further comprises a third resin layer between the first resin layer and the second resin layer,
3. The laminated film according to claim 1, wherein said first resin layer, said second resin layer, and said third resin layer contain the same type of polyolefin resin. The third resin layer is a resin layer (I) containing the polyolefin resin and an ethylene-vinyl alcohol copolymer,
The laminate according to claim 3, wherein the polyolefin resin is neither an ethylene-vinyl alcohol copolymer, an ethylene-vinyl acetate copolymer, nor an ethylene-vinyl alcohol-vinyl acetate copolymer. the film. 5. The laminated film according to claim 4, wherein in the ethylene-vinyl alcohol copolymer, the ratio of the amount of structural units derived from ethylene to the total amount of structural units is 50 mol % or less. 5. The laminated film according to claim 4, wherein the content of the ethylene-vinyl alcohol copolymer in the resin layer (I) is 95% by mass or less with respect to the total mass of the resin layer (I). 5. The laminated film according to claim 4, wherein the resin layer (I) further contains an ethylene-vinyl alcohol-vinyl acetate copolymer. The third resin layer is provided on both sides of the resin layer (II) made of an ethylene-vinyl alcohol copolymer or containing an ethylene-vinyl alcohol copolymer as a main component, and the resin layer (II), 4. The laminated film according to claim 3, which is an adhesive layer containing an adhesive resin. 9. The laminated film according to claim 8, wherein the ratio of the amount of structural units derived from ethylene to the total amount of structural units in the ethylene-vinyl alcohol copolymer is 50 mol % or less. 9. The laminated film according to claim 8, wherein the adhesive layer contains, as the adhesive resin, one or more selected from the group consisting of modified polyolefin and ethylene-vinyl alcohol-vinyl acetate copolymer. The laminated films are faced to each other so that the first resin layers face each other, and heat-sealed under the conditions of a sealing temperature of 140 ° C., a sealing pressure of 0.2 MPa, and a sealing time of 2 seconds. A test piece is prepared by cutting an area with a width of 15 mm,
In the test piece, the seal strength of the laminated film was measured by peeling the laminated films at a peel speed of 300 mm / min in accordance with JIS Z 0238: 1998. The seal strength was 7 N. /15 mm or less, the laminated film according to claim 1 or 2. The laminated film according to claim 1 or 2, wherein the first resin layer is an easy peel layer containing a polyethylene resin and a polypropylene resin. 3. The laminated film according to claim 1 or 2, wherein said laminated film is for a deep-drawn package. A package constructed using the laminated film according to claim 1 or 2. The package comprises a lid material and a bottom material,
The packaging body is configured by sealing the lid material and the bottom material,
Both the lid material and the bottom material are configured using the laminated film,
The first resin layer in the laminated film constituting the bottom material is an easy peel layer, and the first resin layer in the laminated film constituting the lid material is a non-easy peel sealant 15. The package of Claim 14, which is a layer.

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