JP2021011044A - Laminate for forming packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminate for forming a packaging bag, which has a high barrier property by a barrier layer, a high heat seal strength and a high impact peeling property. A packaging bag-forming laminate having a base material layer 110, an adhesive layer 120, and a barrier-type laminated sealant film 130 in this order, in which the barrier-type laminated sealant film 130 is arranged in order from the base material layer 110 side. The barrier laminated sealant film 130 has a first sealant layer 131, a first adhesive resin layer 132, a barrier layer 133, a second adhesive resin layer 134, and a second sealant layer 135. The packaging bag forming laminate 100, which is formed by an extrusion method and in which the first sealant layer 131 is a layer containing a polyethylene resin having a density of 0.900 g / cm3 or more and 0.930 g / cm3 or less. [Selection diagram] Fig. 1

Description

The present invention relates to a laminate for forming a packaging bag.

As a packaging bag forming laminate for storing, storing, transporting, and using pharmaceuticals, quasi-drugs, cosmetics, detergents, foods, etc., a laminate consisting of multiple layers having different functions is used. ing.

For example, in Patent Document 1, a polyethylene terephthalate film, a biaxially stretched nylon film, and a linear low-density polyethylene film are bonded as packaging bag materials by a dry laminating method via an adhesive layer between the films. Laminated sheets are described.

JP-A-2017-210527

When the packaging bag is applied as a "heavy bag" having a large content, it is necessary to increase the strength of the sealed portion because a high load corresponding to the mass of the contents is applied to the sealed portion. Even with the conventional packaging bag forming laminate, it has been possible to increase the sealing strength itself, for example, by changing the heat sealing conditions. However, when a conventional packaging bag forming laminate is used and the sealing strength is increased by changing the heat sealing conditions and applied to a heavy bag, the packaging bag forming laminate is applied when a drop impact or the like is applied to the heavy bag. There was a case of peeling on the body.

The present invention has been made in view of the above circumstances.

An object of the present invention is for forming a packaging bag, which has high barrier properties due to a barrier layer, high heat seal strength, high impact peeling resistance, and preferably further high chemical resistance. It is to provide a laminate.

The present invention is as follows.

<< Aspect 1 >>
A laminated body for forming a packaging bag having a base material layer, an adhesive layer, and a barrier laminated sealant film in this order.
The barrier-type laminated sealant film has a first sealant layer, a first adhesive resin layer, a barrier layer, a second adhesive resin layer, and a second sealant layer in this order from the base material layer side. , Formed by the coextrusion method, and
The first sealant layer is a layer containing a density 0.900 g / cm ³ or more 0.930 g / cm ³ or less of the polyethylene resin,
Laminated body for forming packaging bags.
<< Aspect 2 >>
The laminate for forming a packaging bag according to the first aspect, wherein the second sealant layer is a layer containing a Ziegler-Natta-based linear low-density polyethylene.
<< Aspect 3 >>
The laminate for forming a packaging bag according to aspect 1 or 2, wherein the barrier layer is a layer containing an ethylene-vinyl alcohol copolymer.
<< Aspect 4 >>
The laminate for forming a packaging bag according to the third aspect, wherein the ethylene content in the ethylene-vinyl alcohol copolymer is 30 mol% or more and 50 mol% or less.
<< Aspect 5 >>
The laminate for forming a packaging bag according to any one of aspects 1 to 4, wherein the base material layer is a layer containing nylon.
<< Aspect 6 >>
The density of the polyethylene resin constituting the first sealant layer, 0.915 g / cm ³ or more 0.920 g / cm ³ or less, packaging bag formed of any one of Aspects 1-5 Laminated body.
<< Aspect 7 >>
A packaging bag in which the barrier laminated sealant films of the packaging bag-forming laminate according to any one of aspects 1 to 6 are heat-sealed with each other.
<< Aspect 8 >>
A packaging bag, wherein the barrier laminated sealant film of the packaging bag-forming laminate according to any one of aspects 1 to 6 is heat-sealed with other components of the packaging bag.
<< Aspect 9 >>
The packaging bag according to aspect 7 or 8, wherein the content is 1 L or more.
<< Aspect 10 >>
A packaging bag containing the contents, which comprises the packaging bag according to any one of aspects 7 to 9 and the contents in the packaging bag.
<< Aspect 11 >>
The packaging bag containing the contents according to aspect 10, wherein the contents are selected from pharmaceuticals, quasi-drugs, cosmetics, detergents, foods, and paints.

The laminate for forming a packaging bag of the present invention has high barrier properties due to the barrier layer, high heat seal strength, and high impact peeling resistance. In a preferred embodiment of the present invention, the packaging bag forming laminate of the present invention further has high chemical resistance.

FIG. 1 is a schematic cross-sectional view for explaining an example of the configuration of the laminated body for forming a packaging bag of the present invention.

<< Laminate for packaging bag formation >>
The laminated body for forming a packaging bag of the present invention
A laminated body for forming a packaging bag having a base material layer, an adhesive layer, and a barrier laminated sealant film in this order.
The barrier laminated sealant film has a first sealant layer, a first adhesive resin layer, a barrier layer, a second adhesive resin layer, and a second sealant layer in this order from the base material layer side. It is formed by the extrusion method and
The first sealant layer is a layer containing a density 0.900 g / cm ³ or more 0.930 g / cm ³ or less of the polyethylene resin.

The laminate for forming a packaging bag of the present invention has good barrier properties, high heat seal strength, and high peel resistance by having the above-mentioned structure.

The present inventors have found that the laminate for forming a packaging bag is peeled off when a drop impact or the like is applied to the packaging bag of the prior art, and the details thereof have been examined. As a result, in this peeling, the flexibility of the sealant layer is insufficient, so that the sealant layer absorbs the drop impact sufficiently, and the adhesion between the sealant layer and the other layers is impaired. It was inferred that it was possible.

Based on the above findings, the present inventors have made further studies and arrived at the present invention.

The barrier laminate sealant film of the present invention, the sealant layer on the side to be pasted to other layers by an adhesive (first sealant layer), density 0.900 g / cm ³ or more 0.930 g / cm ³ or less of polyethylene It is a layer containing a system resin. The polyethylene-based resin in this density range has appropriate flexibility and has high absorbency of impact due to dropping or the like. When the first sealant layer containing such a polyethylene-based resin is used, a laminate for forming a packaging bag is provided in which adhesion is maintained and peeling is suppressed even when an impact such as dropping is applied. It is.

In the present invention, each layer constituting the barrier laminated sealant film, that is, the first sealant layer, the first adhesive resin layer, the barrier layer, the second adhesive resin layer, and the second sealant layer are coextruded. It is integrally formed by the law.

The second sealant layer in the packaging bag forming laminate of the present invention is expected to be heat-sealed with each other or with other components of the packaging bag when the packaging bag is formed.

The barrier laminated sealant film in the present invention has a barrier layer, which is excellent in barrier properties, can protect the contents from oxygen, moisture and the like in the environment, and volatilizes contained in the contents. Dissipation of components and the like from the packaging bag is suppressed.

Hereinafter, the configuration of the laminated body for forming a packaging bag of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic cross-sectional view for explaining an example of the configuration of the laminated body for forming a packaging bag of the present invention.

The packaging bag forming laminate (100) of FIG. 1 is
A packaging bag forming laminate (100) having a base material layer (110), an adhesive layer (120), and a barrier-type laminated sealant film (130) in this order.
In the barrier laminated sealant film (130), the first sealant layer (131), the first adhesive resin layer (132), the barrier layer (133), and the second adhesive are formed in this order from the base material layer (110) side. It has a sex resin layer (134) and a second sealant layer (135).

The barrier laminated sealant film (130) in the packaging bag forming laminate (100) is produced by a coextrusion method.

The barrier laminate sealant film (130) the first sealant layer in (131) is a layer containing a density 0.900 g / cm ³ or more 0.930 g / cm ³ or less of the polyethylene resin.

Hereinafter, each layer in the packaging bag forming laminate of the present invention will be described in order.

<Base layer>
The base material layer functions as a protective layer against impact from the outside of the packaging bag, in addition to ensuring shape retention when the packaging bag is formed in the laminated body for forming the packaging bag of the present invention. Further, the base material layer may be made of a printable material, if desired, and may be printed with a description of the contents, an explanation of the contents, a design for improving consumer motivation, and the like.

The base material layer may be a layer containing polyamide, for example, a layer containing nylon, and specifically, for example, a layer containing 6-nylon, 6,6-nylon, or the like.

The base material layer may be either a stretched film or a non-stretched film. The stretching may be either uniaxial stretching or biaxial stretching. The stretching method in the case of biaxial stretching is arbitrary, and for example, a film stretched by tubular biaxial stretching, simultaneous biaxial stretching, sequential biaxial stretching or the like may be used.

The base material layer may be a single layer or a multi-layer. The multilayer may be composed of a multi-layer film made of nylon, or may be a combination of a single-layer or multilayer film made of nylon and another film. The other film may be, for example, a film made of polyolefin, polyester or the like. The base material layer in the present invention is typically a single layer of the above-mentioned preferred nylon film, a multilayer in which two or more such nylon films are laminated, or the outermost surface side of the single-layer or multilayer nylon film. It may have a layer of a polyolefin film or a polyester on (the side opposite to the barrier laminated sealant film).

The thickness of the base material layer may be, for example, 5 μm or more, 8 μm or more, 10 μm or more, 12 μm or more, 15 μm or more, or 20 μm or more in order to impart strength when the package is formed. On the other hand, from the viewpoint that the bag-forming laminate maintains appropriate flexibility and does not excessively increase the total thickness of the laminate, the thickness of the base material layer is, for example, 50 μm or less, 40 μm or less, 30 μm or less, 25 μm. It may be less than or equal to 20 μm or less.

<Barrier laminated sealant film>
The barrier-type laminated sealant film has a first sealant layer, a first adhesive resin layer, a barrier layer, a second adhesive resin layer, and a second sealant layer in this order from the base material layer side.

The barrier laminated sealant film is produced by a coextrusion method and does not contain a dry laminate adhesive layer.

Hereinafter, each layer constituting the barrier laminated sealant film will be described in the order of the first sealant layer, the via layer, the second sealant layer, and the first adhesive resin layer and the second adhesive resin layer.

(First sealant layer)
The first sealant layer is a layer containing a density 0.900 g / cm ³ or more 0.930 g / cm ³ or less of the polyethylene resin.

As described above, the density of the polyethylene-based resin in the first sealant layer is an index indicating the degree of flexibility of the polyethylene-based resin, and a small density of the polyethylene-based resin means high flexibility. doing.

The density of the polyethylene resin in the first sealant layer is 0.930 g / cm ³ from the viewpoint of ensuring the flexibility of the polyethylene resin in the first sealant layer and sufficiently increasing the impact peeling resistance. or less, 0.925 g / cm ³ or less, or 0.920 g / cm ³ may be less. On the other hand, if the density of the polyethylene-based resin in the first sealant layer is excessively low, the first sealant layer will be used when the second heat-sealing layer is heat-sealed in order to mold the present invention into a packaging bag. There is a concern that it will flow and flow out of the laminate. From the viewpoint of avoiding this, the density of the polyethylene resin in the first sealant layer is a 0.900 g / cm ³ or more, 0.905 g / cm ³ or more, 0.910 g / cm ³ or more, or 0. It may be 915 g / cm ³ or more. Density of the polyethylene resin of the first sealant layer may be, for example, 0.915 g / cm ³ or more 0.920 g / cm ³ or less.

In the present specification, the density of the first sealant layer is a value measured at 25 ° C. according to JIS K7112.

The polyethylene-based resin having a density in the above range in the first sealant layer may be hereinafter referred to as "specific polyethylene-based resin".

The specific polyethylene-based resin in the first sealant layer may be a homopolymer of ethylene or a copolymer of ethylene and another olefin. Specific examples of the specific polyethylene-based resin in the first sealant layer include low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), ultra-low-density polyethylene (ULDPE), and the like, which are selected from these. One or more of the following may be used. The specific polyethylene-based resin may be selected from LDPE and LLDPE, and may be LDPE in particular, in order to show an appropriate density and a suitable range of flexibility.

As the specific polyethylene-based resin in the first sealant layer, only one type may be used, or a mixture of two or more types may be used.

The first sealant layer may be a single layer or a multilayer layer, but it is necessary that the layer of the specific polyethylene-based resin is the outermost layer. The layer other than the specific polyethylene resin layer does not contain the specific polyethylene resin and contains a resin selected from polyethylene resins other than the specific polyethylene resin, modified polyolefin, polystyrene, polyester, polyamide, polyurethane and the like. It may be a layer that is present.

From the viewpoint of ensuring a high degree of impact resistance, the thickness of the first sealant layer may be, for example, 5 μm or more, 10 μm or more, 15 μm or more, 20 μm or more, 25 μm or more, or 30 μm or more. On the other hand, from the viewpoint of not excessively increasing the total thickness of the laminated film for forming a packaging bag, the thickness of the first sealant layer is, for example, 50 μm or less, 45 μm or less, 40 μm or less, 35 μm or less, or 30 μm or less. Good.

When the first sealant layer is multi-layered, the thickness of the first sealant layer is the total thickness of all the layers constituting the first sealant layer.

(Barrier layer)
The barrier layer imparts, for example, an oxygen blocking function to the packaging bag forming laminate of the present invention to protect the contents stored in the packaging bag from oxidation, and the contents stored in the packaging bag are the bag. It has a function of suppressing leakage to the outside. In order to effectively exhibit such a function, the barrier layer may contain an ethylene-vinyl alcohol copolymer (EVOH).

The ethylene content of EVOH in the barrier layer is, for example, 50 mol% or less, 48 mol% or less, 46 mol% or less, 45 mol% or less from the viewpoint of ensuring the barrier property, particularly the oxygen blocking property of the packaging bag forming laminate. , 44 mol% or less, 43 mol% or less, 42 mol% or less, or 40% or less, and on the other hand, from the viewpoint of ensuring the impact resistance of the obtained packaging bag, particularly the drop impact peeling resistance, for example. , 30 mol% or more, 33 mol% or more, 34 mol% or more, 35 mol% or more, or 36 mol% or more. The ethylene content of the ethylene-vinyl alcohol copolymer may typically be, for example, 30 mol% or more and 50 mol% or less, 33 mol% or more and 46 mol% or less, or 35 mol% or more and 42 mol% or less.

The thickness of the barrier layer may be, for example, 5 μm or more, 7 μm or more, 8 μm or more, 9 μm or more, or 10 μm or more from the viewpoint of ensuring sufficiently high oxygen blocking property, and from the viewpoint of ensuring flexibility as a packaging bag. Therefore, for example, it may be 15 μm or less, 14 μm or less, 13 μm or less, 12 μm or less, 11 μm or less, or 10 μm or less.

(Second sealant layer)
The second sealant layer functions as a sealing layer for molding the packaging bag forming laminate of the present invention into a packaging bag. The second sealant layer may contain, for example, a resin having a heat-sealing function, and may be composed of a resin having a heat-sealing function.

In addition, the second sealant layer becomes the innermost layer when the packaging bag forming laminate of the present invention is molded into a packaging bag, and comes into direct contact with the contents. Therefore, it is desired that the resin contained in the second sealant layer has chemical resistance according to the contents expected to be stored.

Examples of the resin having a heat-sealing function and high chemical resistance include polyolefin. Therefore, the second sealant layer may contain polyolefin.

The polyolefin contained in the second sealant layer may be, for example, polypropylene, polyethylene or the like, and polyethylene is particularly preferable. Specific examples of the polyethylene contained in the second sealant layer include high-density polyethylene (HDPE), medium-density polyethylene (MDPE), low-density polyethylene (LDPE), and linear low-density polyethylene (LLDPE). The second sealant layer may contain one or more selected from these. The second sealant layer is preferably a layer containing LLDPE, and is a layer composed of LLDPE, from the viewpoint of imparting a high degree of workability in addition to good heat sealing property and high chemical resistance. Is more preferable.

The LLDPE contained in the second sealant layer may be a metallocene-based LLDPE (M-LLDPE) produced by a metallocene catalyst, or a Ziegler-Natta-based LLDPE (ZN-LLDPE) produced by a Ziegler-Natta catalyst. It may be.

However, considering the recent application to high-speed heat sealing, ZN-LLDPE may be used. That is, since ZN-LLDPE has a plurality of melting point peaks in DSC, for example, even if the sealing portion does not reach the typical melting point of polyethylene (about 120 ° C.) in the high-speed heat sealing step, it exhibits an appropriate heat sealing strength. Conceivable. That is, even when the temperature of the sealing portion does not reach the typical melting point of polyethylene, the methylene chain crystal corresponding to the relatively low temperature peak can be melted, and this portion is considered to contribute to heat sealing.

The second sealant layer may be composed of only the polyolefin as described above, or may be composed of a mixture of the polyolefin and another resin. The other resin may be selected from, for example, modified polyolefin, polystyrene, polyester, polyamide, polyurethane and the like.

The second sealant layer may be a single layer or a multi-layer. The second sealant layer having multiple layers may have one or more layers containing polyolefin, may be composed of only a layer containing polyolefin, or may be composed of a layer containing polyolefin and another layer. You may. The other layer does not contain polyolefin and may contain a resin selected from modified polyolefin, polystyrene, polyester, polyamide, polyurethane and the like.

When the second sealant layer has multiple layers, the layer containing polyolefin may be the outermost layer, and the outermost layer containing polyolefin may be arranged on the opposite side to the base material layer.

From the viewpoint of ensuring high heat sealability, the thickness of the second sealant layer may be, for example, 30 μm or more, 40 μm or more, 50 μm or more, 60 μm or more, 70 μm or more, or 80 μm or more. On the other hand, from the viewpoint of not excessively increasing the total thickness of the laminated film for forming a packaging bag, the thickness of the second sealant layer is, for example, 120 μm or less, 110 μm or less, 100 μm or less, 90 μm or less, or 80 μm or less. Good.

When the second sealant layer is multi-layered, the thickness of the second sealant layer is the total thickness of all the layers constituting the second sealant layer.

(First adhesive resin layer and second adhesive resin layer)
The first adhesive resin layer and the second adhesive resin layer adhere between the barrier layer in the barrier laminated sealant film and the first sealant layer and the second sealant layer, and these layers are laminated. It has a function to make it. The first adhesive resin layer is arranged between the first sealant layer and the barrier layer, and the second adhesive resin layer is arranged between the barrier layer and the second sealant layer.

The first adhesive resin layer and the second adhesive resin layer have a high affinity for the polar portions having a high affinity with the structure of the barrier layer and the structures of the first and second sealant layers, respectively, for example. It may have a polyolefin skeleton. Further, the first adhesive resin layer and the second adhesive resin layer may further have a function of sandwiching the barrier layer to alleviate the impact from the outside of the laminate and protect the barrier layer. Therefore, these adhesive resin layers may be composed of a relatively soft resin.

The material constituting the first and second adhesive resin layers may be a thermoplastic resin. The thermoplastic resin may be, for example, an acid-modified polyolefin or the like. The acid-modified polyolefin may be, for example, a carboxylic acid-modified polyolefin or the like, particularly an unsaturated dicarboxylic acid-modified polyolefin or the like, and preferably an α, β-unsaturated dicarboxylic acid-modified polyolefin. Here, the polyolefin may be, for example, polyethylene, polypropylene, or the like. The α, β-unsaturated dicarboxylic acid preferably used for modifying the polyolefin may be, for example, maleic acid, fumaric acid, citraconic acid or the like. The thermoplastic resin constituting the first and second adhesive resin layers preferably contains carboxylic acid-modified polyethylene or carboxylic acid-modified polypropylene, preferably contains carboxylic acid-modified polyethylene, and is typically carboxylic acid-modified. It may be composed of polyethylene.

When the first and second adhesive resin layers contain carboxylic acid-modified polyolefins, the degree of acid modification of these polyolefins is arbitrary.

The thickness of the first and second adhesive resin layers may be, for example, 3 μm or more, 4 μm or more, 5 μm or more, 6 μm or more, or 7 μm or more, and for example, 10 μm or less, 8 μm or less, 6 μm or less, or It may be 5 μm or less.

<Adhesive layer>
The adhesive layer in the packaging bag forming laminate of the present invention has a function of adhering between the base material layer and the barrier laminated sealant film and laminating them. Such an adhesive layer may be, for example, a layer composed of a dry laminate adhesive, a layer composed of an anchor coating agent, or the like.

The dry laminate adhesive may be, for example, a two-component adhesive composed of a polyol and an isocyanate. The polyol may have a skeleton such as a polyester type or a polyester polyurethane type. The isocyanate may be either aromatic or aliphatic. When an aromatic isocyanate is used, an adhesive resin layer having excellent adhesive strength can be obtained. When an aliphatic isocyanate is used, an adhesive resin layer having no problem such as odor can be obtained. When used in a bag for storing foods, pharmaceuticals, etc., a dry laminating adhesive composed of a combination of a polyester-based or polyester polyurethane-based polyol and an aliphatic isocyanate may be used.

The thickness of the adhesive layer composed of the dry laminate adhesive may be, for example, 2 μm or more, 3 μm or more, or 4 μm or more, and may be, for example, 7 μm or less, 5 μm or less, or 4 μm or less.

The anchor coating agent may be, for example, an appropriate two-component anchor coating agent such as polyester-based, polyamine-based, or polyurethane-based.

The thickness of the adhesive layer composed of the anchor coating agent may be, for example, in the range of 0.1 μm or more and 3 μm or less.

<Arbitrary additives for each layer>
Each layer in the packaging bag forming laminate of the present invention may optionally contain an additive usually contained in a resin material. The additive may be selected from, for example, a lubricant, an antioxidant, a flame retardant, a plasticizer, an ultraviolet absorber, an antistatic agent and the like.

<< Manufacturing method of laminate for packaging bag formation >>
The laminate for forming a packaging bag of the present invention may be produced by any method.

The laminate for forming a packaging bag of the present invention may be produced by an appropriate method depending on the composition of the adhesive layer.

A packaging bag forming laminate in which the adhesive layer is composed of a dry laminate adhesive is, for example,
Preparing the base material (base material layer preparation step),
To prepare a barrier laminated sealant film having a first sealant layer, a first adhesive resin layer, a barrier layer, a second adhesive resin layer, and a second sealant layer (barrier laminated sealant film manufacturing step). ), And the base material layer and the barrier-type laminated sealant film are bonded and laminated via an adhesive layer (lamination step).
It may be manufactured by a method including.

In the base material layer preparation step, the base material layer is prepared. As the base material layer, the same base material layer as that in the desired packaging bag forming laminate is appropriately selected and prepared. As the base material layer, for example, one produced by a known method may be used, a commercially available product may be used, or a commercially available product that has been appropriately processed (for example, surface treatment or the like) is used. May be good.

In the barrier laminated sealant film manufacturing step, for example, a barrier laminated sealant film having a five-layer structure is produced according to the composition of the barrier laminated sealant film in the desired packaging bag forming laminate. The barrier laminated sealant ilme in the packaging bag forming laminate of the present invention is produced by a coextrusion method and does not contain a dry laminate adhesive layer.

Then, in the laminating step, the base material layer and the barrier laminated sealant film are adhered and laminated via an adhesive layer composed of a predetermined dry laminating adhesive, whereby the adhesive layer is dry-laminated. A laminated body for forming a packaging bag composed of an agent can be obtained.

On the other hand, a packaging bag forming laminate in which the adhesive layer is composed of an anchor coating agent is, for example,
Preparing the base material (base material layer preparation step),
Forming an adhesive layer composed of an anchor coating agent on the base material layer (adhesive layer forming step), and on the adhesive layer, a first sealant layer, a first adhesive resin layer, and a barrier. A barrier laminated sealant film having a layer, a second adhesive resin layer, and a second sealant layer is extruded in multiple layers so that the first sealant layer is in contact with the adhesive layer (barrier laminated laminated sealant film lamination). Process)
It may be manufactured by a method including.

As for the base material layer preparation step, the description regarding the base material layer preparation step in the method for producing a laminate for forming a packaging bag in which the adhesive layer is composed of a dry laminate adhesive can be used as it is.

In the adhesive layer forming step, an adhesive layer composed of a predetermined anchor coating agent is formed on the base material layer.

Then, in the barrier laminated sealant film laminating step, the first sealant layer, the first adhesive resin layer, the barrier layer, the second adhesive resin layer, and the second adhesive layer are placed on the adhesive layer formed above. By extruding a barrier laminated sealant film having the above sealant layer in multiple layers so that the first sealant layer is in contact with the adhesive layer, a laminate for forming a packaging bag in which the adhesive layer is composed of an anchor coating agent is formed. Obtainable.

《Packaging bag》
According to another aspect of the present invention, there is provided a packaging bag composed of the packaging bag forming laminate of the present invention.

The packaging bag of the present invention may have any of the following configurations:
(1) A packaging bag (first packaging bag) or a packaging bag, or a packaging bag (first packaging bag), in which the barrier laminated sealant films of the packaging bag forming laminate of the present invention are heat-sealed with each other.
(2) A packaging bag (second packaging bag) in which the barrier-type laminated sealant film of the packaging bag-forming laminate of the present invention is heat-sealed with other components of the packaging bag.

In the first packaging bag of the present invention, for example, the packaging bag forming laminate is arranged so as to face the second sealant layer of the laminate so that the second sealant layer faces inward, and the end portion of the second sealant layer is arranged. It is formed into a bag shape by being heat-sealed with each other.

In the second packaging bag of the present invention, for example, the packaging bag forming laminate is arranged so as to face each other so that the second sealant layer of the laminate faces inward, and the second packaging bag is arranged so as to face each other. Other components of the packaging bag are placed in the gaps between the sealant layers, and these are heat-sealed with each other to form a bag shape. Other components of the packaging bag may be, for example, spouts and the like.

The packaging bag has an arbitrary shape such as a bottom seal bag shape, a side seal bag shape, a three-way seal bag shape, a pillow bag shape, a square bottom bag shape, a pouch shape, a standing pouch shape, and a gusset bag shape. Good.

The content of the packaging bag of the present invention is arbitrary, and can be, for example, about 10 mL or more and 100 L or less. When the packaging bag of the present invention is a "heavy bag" having an internal capacity of 1 L or more, 2 L or more, 3 L or more, 5 L or more, or 10 L or more, the expected effect of the present invention is maximized, which is preferable. The contents of the packaging bag of the present invention, which is a heavy bag, are, for example, 80 L or less, 50 L or less, 30 L or less, 40 L or less, 30 L or less, 25 L or less, 20 L or less, 15 L or less, 10 L or less, 8 L or less, 5 L or less, 4 L. Hereinafter, it may be 3 L or less, or 2 L or less.

<< Packaging bag with contents >>
According to still another aspect of the present invention, there is provided a packaging bag containing the contents, which comprises the packaging bag of the present invention and the contents in the packaging bag.

The contents of the packaging bag containing the contents of the present invention may be a liquid article. The liquid article may be, for example, a pharmaceutical product, a quasi drug, a cosmetic product, a detergent, a food product, a paint, or the like. Pharmaceuticals and quasi-drugs include, for example, injections, infusions, infusions, perfusates, decoctions and the like. Cosmetics include, for example, shampoos, conditioners, hair styling products (eg, hair water, hair liquids, greases, etc.) and the like. Foods include, for example, beverages, cooking oils, soups, creams, liquid seasonings (eg, soy sauce, vinegar, noodle soup, warishita, mirin, Worcestershire sauce, ketchup, tabasco, sweeteners, etc.). Detergents include neutral detergents, alkaline detergents, and acidic detergents. The paint includes, for example, paint, varnish, oil stain and the like.

In the following Examples and Comparative Examples, the density of the first sealant layer is a value obtained by measuring at 25 ° C. according to JIS K7112.

<< Example 1 >>
(1) Preparation of Laminate for Forming Packaging Bag The above-mentioned first sealant layer, first adhesive resin layer, barrier layer, second adhesive resin layer, and second sealant layer are laminated in this order. A barrier-type laminated sealant film was produced by coextrusion inflation molding.

Lamination for bag formation by laminating a base material layer on the surface of the obtained barrier-type laminated sealant film on the side of the first sealant layer via a polyester-based dry laminate adhesive layer having a thickness of 3 μm by dry laminating. The body was made.

The constituent materials and thickness of each layer are as follows.

First sealant layer: LDPE with density 0.915 g / cm ³ , thickness 30 μm
First adhesive resin layer: maleic acid-modified PE (Mal-PE), thickness 5 μm
Barrier layer: Ethylene vinyl alcohol copolymer (EVOH) (ethylene content 38 mol%), thickness 10 μm
Second adhesive resin layer: maleic acid-modified PE (Mal-PE), thickness 5 μm
Second sealant layer: Ziegler-Natta-based LLDPE (ZN-LLDPE), thickness 80 μm
Base material layer: Biaxially stretched nylon film, thickness 25 μm

(2) Evaluation (2-1) Evaluation of drop resistance (impact peeling resistance against drop impact) Using the obtained laminate for forming a packaging bag, the second sealant layer is heat-sealed inward. A pillow bag having a capacity of 5 L was produced. This pillow bag was filled with 5 kg of water to obtain a packaging bag containing the contents.

The above-mentioned packaging bag containing the contents was subjected to a drop test as follows using a commercially available drop tester with a drop height of 1 m to evaluate the drop resistance.

A total of 9 drops were performed so that the side of the packaging bag containing the contents without the backing was facing down. The packaging bag containing the contents after being dropped 9 times was visually observed and evaluated according to the following criteria. The evaluation results are shown in Table 1.
A: When no abnormality is found B: When the bag is not broken, but the base material layer is observed to float in the heat seal part C: When the bag is broken

(2-2) Evaluation of tearability A pillow bag was prepared in the same manner as in "(2-1) Evaluation of drop resistance of a packaging bag" using a bag-forming laminate. An I notch having a length of 5 mm was inserted into the heat-sealed portion of the pillow bag, and the I notch was used as a tear start portion to manually perform a sensory evaluation of tearing and opening, and the evaluation was performed according to the following criteria.
A: When tearing is easy C: When the 5-layer sealant film is stretched and tearing is impossible or difficult

(2-3) Evaluation of Laminate Strength of Laminate for Packaging Bag Formation Laminate strength (peeling strength between barrier laminated sealant film and base material layer) of laminate for bag formation is based on JIS K-6854. , 25 ° C., peeling speed 300 mm / min, measured by T-type peeling test, and evaluated according to the following criteria. The evaluation results are shown in Table 1.
A: When the laminating strength is 15N / 15mm or more B: When the laminating strength is 7N / 15mm or more and less than 15N / 15mm C: When the laminating strength is less than 7N / 15mm

(2-4) Evaluation of chemical resistance (acceleration test)
Using the obtained laminate for forming a packaging bag, a pouch having an inner size of 100 mm × 100 mm was produced by heat-sealing with the base material layer side facing outward. This pouch was filled with 30 g of an aqueous sodium hypochlorite solution (pH ≧ 12.5) having a concentration of 12% by mass to obtain a packaging bag containing the contents.

The obtained packaging bag containing the contents was stored at 40 ° C. for 30 days. After 30 days have passed, the pouch is opened to remove the contents, and after washing with distilled water, a chemical resistance promotion test is carried out in the same manner as in "(2-3) Evaluation of laminate strength of packaging bag forming laminate". The laminating strength of the later bag-forming laminate was measured. The evaluation results are shown in Table 1.

In addition, the appearance of the laminated body for forming a packaging bag after the chemical resistance promotion test was visually observed and evaluated according to the following criteria. The evaluation results are shown in Table 1.
A: When no abnormality is observed in the appearance of the packaging bag forming laminate B: When floating (partial peeling) is observed between the layers of the packaging bag forming laminate C: Packaging bag forming laminate When delamination is observed in

<< Examples 2 and 3 and Comparative Examples 1 to 3 >>
As the first sealant layer, LDPE ((Examples 2 and 3), metallocene-based LLDPE (M-LLDPE) (Comparative Examples 1 and 2), or ultra-low density PE (ULDPE) (Comparative Example 3) shown in Table 1 is used. ) Was used, and various evaluations were performed by preparing a laminate for forming a packaging bag in the same manner as in Example 1. The evaluation results were used as the DSC of the metallocene-based LLDPE used as the first sealant layer. Table 1 shows the measurement results.

In Comparative Example 3 in which ULDPE having a density of 0.897 g / cm ³ was used as the first sealant layer, the barrier laminated sealant film had poor slipperiness and was difficult to handle. Therefore, the laminated body for forming a packaging bag was used. It could not be prepared and evaluated.

In Table 1, the abbreviations in the resin type column of each layer have the following meanings.
Ny: Biaxially stretched nylon film LDPE: Low density polyethylene M-LLDPE: Metallocene linear low density polyethylene ZN-LLDPE: Cheegler-Natta linear low density polyethylene ULDPE: Ultra low density polyethylene M-PE: Maleic acid Modified Polyethylene EVOH: Ethylene-Vinyl Alcohol Copolymer

Referring to Table 1, in Comparative Example 1 in which the density of the first sealant layer is 0.935 and Comparative Example 2 in which the density of the first sealant layer is 0.940, drop resistance, tear resistance, laminate strength, and chemical resistance are insufficient. Met. Further, in Comparative Example 3 in which the density of the first sealant layer is 0.897, since the five-layer sealant film has poor slipperiness and is difficult to handle, it is possible to prepare and evaluate a laminate for forming a packaging bag. could not.

For these, in Examples 1 to 3 in the range density of 0.900 g / cm ³ or more 0.930 g / cm ³ or less of the first sealant layer, excellent drop resistance and tear resistance, and lamination strength and The chemical resistance also showed good results. In particular, the density of the first sealant layer is 0.915 g / cm ³ or more 0.920 g / cm ³ or less in Examples 1 and 2, excellent in drop resistance and tear resistance, good laminate strength and chemical resistance Indicated.

100 Laminate for forming a packaging bag 110 Base material layer 120 Adhesive layer 130 Barrier laminated sealant film 131 First sealant layer 132 First adhesive resin layer 133 Barrier layer 134 Second adhesive resin layer 135 Second Sealant layer

Claims (11)

A laminated body for forming a packaging bag having a base material layer, an adhesive layer, and a barrier laminated sealant film in this order.
The barrier laminated sealant film has a first sealant layer, a first adhesive resin layer, a barrier layer, a second adhesive resin layer, and a second sealant layer in this order from the base material layer side. , Formed by the coextrusion method, and
The first sealant layer is a layer containing a density 0.900 g / cm ³ or more 0.930 g / cm ³ or less of the polyethylene resin,
Laminated body for forming packaging bags. The laminate for forming a packaging bag according to claim 1, wherein the second sealant layer is a layer containing a Ziegler-Natta-based linear low-density polyethylene. The laminate for forming a packaging bag according to claim 1 or 2, wherein the barrier layer is a layer containing an ethylene-vinyl alcohol copolymer. The laminate for forming a packaging bag according to claim 3, wherein the ethylene content in the ethylene-vinyl alcohol copolymer is 30 mol% or more and 50 mol% or less. The laminate for forming a packaging bag according to any one of claims 1 to 4, wherein the base material layer is a layer containing nylon. Density of the polyethylene resin constituting the first sealant layer is 0.915 g / cm ³ or more 0.920 g / cm ³ or less, packaging bag formed of any one of claims 1 to 5 For laminate. A packaging bag in which the barrier laminated sealant films of the packaging bag forming laminate according to any one of claims 1 to 6 are heat-sealed with each other. A packaging bag, wherein the barrier laminated sealant film of the packaging bag forming laminate according to any one of claims 1 to 6 is heat-sealed with other components of the packaging bag. The packaging bag according to claim 7 or 8, wherein the content is 1 L or more. A packaging bag containing the contents, which comprises the packaging bag according to any one of claims 7 to 9 and the contents in the packaging bag. The packaging bag containing the contents according to claim 10, wherein the contents are selected from pharmaceuticals, quasi-drugs, cosmetics, detergents, foods, and paints.

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