JP6789213B2 - Laminate for packaging with UV absorption layer - Google Patents

Description

The present invention relates to a packaging laminate having an ultraviolet absorbing layer. In particular, the present invention relates to a transparent laminate for a laminated tube having an ultraviolet absorbing layer, which can suppress bleed-out of an organic ultraviolet absorber and can be easily produced.

A package with an ultraviolet absorbing layer for preventing the contents from being deteriorated by ultraviolet rays has been conventionally known. Such a package includes a coating type package with an ultraviolet absorbing layer using a coating layer containing an ultraviolet absorber and a kneaded type package with an ultraviolet absorbing layer in which an ultraviolet absorber is kneaded in a resin binder. It can be called the body.

As a kneaded type package with an ultraviolet absorbing layer, Patent Document 1 discloses a package containing polyethylene and an ultraviolet absorber in the outermost heat-sealing layer.

Patent Document 2 discloses a packaging laminate having an ultraviolet absorbing layer containing an ultraviolet absorbing agent which is a benzotriazole and polyethylene. Here, in order to suppress bleed-out (dusting) of the ultraviolet absorber to the surface, a migration blocking layer is laminated on the ultraviolet absorbing layer. As the migration prevention layer, an oxygen atom-containing thermoplastic resin layer, particularly nylon (Ny), ethylene-vinyl alcohol copolymer (EVOH), or the like is used. A polyethylene film is further laminated on the migration prevention layer by dry lamination so that the package can be heat-sealed.

Patent Document 3 discloses a laminate including a layer (a) made of a thermoplastic resin and a layer (b) made of a thermoplastic resin containing an ultraviolet absorber, and here, the layer (a) makes (b) Sandwiching layers.

Japanese Unexamined Patent Publication No. 2002-066222 Japanese Unexamined Patent Publication No. 9-239889 Japanese Unexamined Patent Publication No. 7-040954

In the invention described in Patent Document 1, since the surface layer contains an ultraviolet absorber, it easily bleeds out, especially when an organic ultraviolet absorber is used. In that case, when the laminated body is rolled before being packaged, the ultraviolet absorber may be transferred to the inner layer side in contact with the contents. Further, if the ultraviolet absorber bleeds out on the surface on the outer layer side, the ink adhesion becomes low even when printing is attempted, which makes printing difficult.

In the invention described in Patent Document 2, the oxygen atom-containing thermoplastic resin used for the migration blocking layer of the ultraviolet absorber is expensive. Further, the ultraviolet absorbing layer and the migration blocking layer need to be adhered by a dry laminate using an adhesive or an easily adhesive resin. The easy-adhesive resin used at this time is relatively difficult to manufacture because it involves complicated processing such as not being easy to clean the mold. Further, when an attempt is made to laminate a heat seal layer on the surface in order to use this laminate for a packaging body, the number of laminates also increases.

The laminate described in Patent Document 3 also does not have a heat-sealing property because a polyester resin or the like is used for the layer (a) made of a thermoplastic resin, and the laminate is used on the surface for use in a package. When trying to laminate the heat seal layer, the number of layers increases.

Therefore, an object of the present invention is to provide a packaging laminate having an ultraviolet absorbing layer, which can suppress bleed-out of an organic ultraviolet absorber and can be easily produced.

The present inventors have found that the above problems can be solved by the present invention having the following aspects.
<< Aspect 1 >>
A laminate for a packaging body, which comprises a first polyolefin layer, an ultraviolet absorbing layer containing an organic ultraviolet absorber and a polyolefin, and a second polyolefin layer in this order.
The thickness of the first polyolefin layer, the ultraviolet absorbing layer, and the second polyolefin layer are each more than 25 μm, and the content of the organic ultraviolet absorber is 0 with respect to the ultraviolet absorbing layer. A laminate for packaging, which is 0.01 to 2.0% by weight.
<< Aspect 2 >>
The packaging laminate according to aspect 1, wherein the thickness of the first polyolefin layer and the thickness of the second polyolefin layer are 30 μm or more, respectively.
<< Aspect 3 >>
The aspect 1 or 2, wherein the thickness of the ultraviolet absorbing layer is 60 μm or more, and the content of the organic ultraviolet absorbing agent is 0.25 to 1.0% by weight with respect to the ultraviolet absorbing layer. Laminated material for packaging.
<< Aspect 4 >>
The packaging laminate according to any one of aspects 1 to 3, wherein the total thickness of the first polyolefin layer, the ultraviolet absorbing layer, and the second polyolefin layer is 200 μm or more and 500 μm or less.
<< Aspect 5 >>
The packaging laminate according to any one of aspects 1 to 4, wherein no adhesive for dry lamination is present between the first polyolefin layer, the ultraviolet absorbing layer, and the second polyolefin layer. ..
<< Aspect 6 >>
Any of aspects 1 to 5, wherein the lamination strength of the first polyolefin layer and the ultraviolet absorbing layer and the lamination strength of the ultraviolet absorbing layer and the second polyolefin layer are 5.0 N / 15 mm or more, respectively. The packaging laminate according to item 1.
<< Aspect 7 >>
The packaging laminate according to any one of aspects 1 to 6, which is laminated on the second polyolefin layer and further contains a base material layer and a heat seal layer in this order.
<< Aspect 8 >>
A packaging laminate in which a base material layer is sandwiched between the second polyolefin layer of the two packaging laminates according to any one of aspects 1 to 6.
<< Aspect 9 >>
The packaging laminate according to aspect 7 or 8, wherein the light transmittance at a wavelength of 380 nm is 10% or less, and the light transmittance at a wavelength of 450 nm is 75% or more.
<< Aspect 10 >>
A tube packaging body formed by using the packaging laminate according to any one of aspects 7 to 9.
<< Aspect 11 >>
A molten resin composition containing an organic ultraviolet absorber and a polyolefin is extruded into the first polyolefin layer to form an ultraviolet absorbing layer to form a first laminated body, and with the first laminated body. , A method for producing a laminate for packaging, which comprises sandwich-laminating a molten resin composition containing an ultraviolet absorber and a polyolefin with a second polyolefin layer.

According to the present invention, it is possible to provide a packaging laminate having an ultraviolet absorbing layer, which can suppress bleed-out of an organic ultraviolet absorber and can be easily produced.

FIG. 1 illustrates the packaging laminate of the present invention.

<< Laminate for packaging >>
The packaging laminate of the present invention contains a first polyolefin layer, an ultraviolet absorbing layer containing an organic ultraviolet absorber and polyolefin, and a second polyolefin layer in this order. Here, the thickness of the first polyolefin layer, the ultraviolet absorbing layer, and the second polyolefin layer are each more than 25 μm, and the content of the organic ultraviolet absorber is 0.01 with respect to the ultraviolet absorbing layer. ~ 2.0% by weight.

In the present invention, the bleed-out is suppressed by lowering the concentration of the ultraviolet absorber contained in the ultraviolet absorbing layer, and the ultraviolet absorbing layer is made relatively thick so as not to deteriorate the ultraviolet absorbing performance, and the first By making the polyolefin layer 1 and the second polyolefin layer also relatively thick, the polyolefin layer can function as a layer for preventing the migration of the ultraviolet absorber. Further, in the laminate of the present invention, the adhesive strength between these layers can be increased by lowering the concentration of the ultraviolet absorber and by forming each layer from polyolefin.

The laminate of the present invention is preferably transparent, so that the inside of the package produced using this laminate can be visually confirmed. In particular, the laminate of the present invention has a light transmittance at a wavelength of 450 nm of 75% or more, 80% or more, or 85% or more when measured with a spectrophotometer U-4000 (Hitachi High-Technologies Corporation). is there.

The laminate of the present invention does not transmit ultraviolet rays. In particular, the laminate of the present invention has a light transmittance at a wavelength of 380 nm of 20% or less, 10% or less, or 7% or less when measured with a spectrophotometer U-4000 (Hitachi High-Technologies Corporation). is there. In particular, the laminate of the present invention has a light transmittance at a wavelength of 350 nm of 5.0% or less and 3.0% or less when measured with a spectrophotometer U-4000 (Hitachi High-Technologies Corporation). Or 1.0% or less.

The laminate of the present invention may be composed of three layers without including another layer between the first polyolefin layer, the ultraviolet absorbing layer, and the second polyolefin layer. In this case, it is more preferable that the ultraviolet absorbing layer is formed between the first polyolefin layer and the second polyolefin layer by the sandwich laminate. In this case, high lamination strength can be provided between these layers. In this case, in the laminate of the present invention, it is preferable that no adhesive for dry lamination is present between the first polyolefin layer, the ultraviolet absorbing layer, and the second polyolefin layer. Specifically, a polyurethane-based adhesive, an acrylic resin-based adhesive, an epoxy resin-based adhesive, and a silicone resin-based adhesive are placed between the first polyolefin layer, the ultraviolet absorbing layer, and the second polyolefin layer. It is preferably not present.

For example, the lamination strength between the first polyolefin layer and the ultraviolet absorbing layer and the lamination strength between the ultraviolet absorbing layer and the second polyolefin layer are determined by using Strograph VE10D (Toyo Seiki Seisakusho Co., Ltd.) in the T-shaped peeling test method. When the distance between the gripping jigs is 50 mm and the tensile speed is 300 mm / min, the values are preferably 5.0 N / 15 mm or more, 7.0 N / 15 mm or more, or 10.0 N / 15 mm or more, respectively.

The total thickness of the three layers of the first polyolefin layer, the ultraviolet absorbing layer, and the second polyolefin layer may be 100 μm or more, 120 μm or more, 150 μm or more, or 200 μm or more, and may be 500 μm or less, 350 μm or less, It may be 300 μm or less, or 250 μm or less.

The laminate of the present invention may further have a base material layer on the second polyolefin layer side in order to give an appropriate elasticity as a package. Further, the laminate of the present invention may have a heat seal layer on the opposite surface of the base material layer from the second polyolefin layer. As a result, the package can be easily formed by forming the laminated body into a tubular shape and heat-sealing it.

Further, the base material layer may be sandwiched by the two laminates of the present invention. Although this laminated body also has high ultraviolet absorption, it does not cause bleed-out, and the package can be easily formed by giving the package a waist and heat-sealing it into a tubular shape. And it is advantageous.

The laminate of the present invention may have other layers as long as the effects of the present invention are not substantially impaired, and may include, for example, an adhesive layer, a printing layer, an anchor coat layer, a primer layer, and the like. May be good.

For example, in the laminate of the present invention, the total thickness of all layers may be 100 μm or more, 150 μm or more, 200 μm or more, 250 μm or more, or 300 μm or more, and 800 μm or less, 600 μm or less, or 500 μm or less. There may be.

FIG. 1A illustrates a laminate of one embodiment of the present invention. The laminate (10) is composed of a first polyolefin layer (1), an ultraviolet absorbing layer (3), and a second polyolefin layer (2). FIG. 1 (b) illustrates a laminate (10) of one embodiment of the present invention, including a substrate layer (4) and a heat seal layer (5). FIG. 1 (c) illustrates the laminate (10) of one embodiment of the present invention in which the base material layer (4) is sandwiched by the two laminates of FIG. 1 (a). .. It is also considered that the laminate of FIG. 1 (a) is used as the heat seal layer (5) of FIG. 1 (b).

<UV absorption layer>
The ultraviolet absorbing layer used in the laminate of the present invention contains an organic ultraviolet absorber and polyolefin. This layer has a thickness of more than 25 μm, and the content of the organic ultraviolet absorber is 0.01 to 2.0% by weight in this layer. The UV absorption performance can be maintained by lowering the concentration of the UV absorber to suppress bleed-out and ensuring the thickness.

The thickness of this 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, 100 μm or more, or 130 μm or more, or 300 μm or less, 250 μm or less, or 200 μm or less. When two or more UV absorbing layers are present in the laminate, the thickness described here means the total thickness of them.

Even if the content of the organic ultraviolet absorber is, for example, 0.01% by weight or more, 0.05% by weight or more, 0.1% by weight or more, 0.25% by weight or more, or 0.5% by weight or more. It may be 2.0% by weight or less, 1.8% by weight or less, 1.5% by weight or less, 1.2% by weight or less, or 1.0% by weight or less. If the content is too small, the ultraviolet absorbing effect cannot be exhibited, and if the content is too large, the adhesive strength between the layers may decrease and bleed-out may occur. From such a viewpoint, the content of the organic ultraviolet absorber is 0.10% by weight or more and 1.5% by weight or less, and particularly preferably 0.25% by weight or more and 1.0% by weight or less.

The organic ultraviolet absorber is not particularly limited as long as it is an organic compound that absorbs ultraviolet rays, but is benzotriazole compound, benzophenone compound, triazine compound, cyanoacrylate compound, oxanilide compound, salicylate compound, formamidine. Examples thereof include benzotriazole-based compounds, and benzotriazole-based compounds can be used in particular.

Examples of the polyolefin include polyolefins suitable for forming an ultraviolet absorbing layer by sandwich lamination, and examples thereof include polyethylene and polypropylene. Examples of polyethylene include low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), ethylene-acrylic acid copolymer (EAA), and ethylene-methacrylic acid. Copolymer (EMAA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl acrylate copolymer (EMA), ethylene vinyl acetate copolymer (EVA), carboxylic acid modified polyethylene, carboxylic acid modified ethylene vinyl acetate Examples include copolymers, ionomers, and derivatives thereof, as well as mixtures thereof. Examples of polypropylene include polypropylene (PP) homopolymer, random polypropylene (random PP), block polypropylene (block PP), chlorinated polypropylene, carboxylic acid-modified polypropylene, derivatives thereof, and mixtures thereof.

The ultraviolet absorbing layer may have other additives or an inorganic ultraviolet absorbing agent as long as the effects of the present invention are not substantially impaired.

<First polyolefin layer and second polyolefin layer>
Both the first polyolefin layer and the second polyolefin layer have a thickness of more than 25 μm, thereby suppressing bleed-out of the ultraviolet absorber. Both the first polyolefin layer and the second polyolefin layer are preferably heat-sealing. When a film-forming film is used as the heat-sealing layer, it is preferable that the film-forming film has a thickness of more than 25 μm because the film-forming film tends to be stable. The thickness of the first polyolefin layer and the second polyolefin layer used in the present invention is preferably more than 25 μm.

The thickness of the first polyolefin layer and the second polyolefin layer may be more than 25 μm, 30 μm or more, 35 μm or more, 40 μm or more, or 50 μm or more, and may be 150 μm or less or 100 μm or less, respectively. When two or more first polyolefin layers and second polyolefin layers are present in the laminate, the thickness described here means the respective thicknesses. At least one of the first polyolefin layer and the second polyolefin layer may be more than 30 μm, more than 40 μm, or more than 70 μm.

Examples of the polyolefin used for these layers include the same types of polyolefins that can be used in the above-mentioned ultraviolet absorbing layer. Preferably, the polyolefin used in the first polyolefin layer and the second polyolefin layer is the same type of polyolefin as the polyolefin used in the ultraviolet absorbing layer. Further, preferably, the polyolefin used in the first polyolefin layer and the second polyolefin layer is not an oxygen atom-containing polyolefin. Preferably, the polyolefin used in the first polyolefin layer and the second polyolefin layer contains a repeating unit of an ethylene group in the main chain of the polymer in an amount of 50 mol% or more, 60 mol% or more, 70 mol% or more, 80 mol% or more, or 90 mol. % Or more, and the main chain of the polymer contains 30 mol% or more, 40 mol% or more, 50 mol% or more, 60 mol% or more, 70 mol% or more, or 80 mol% or more of repeating units of propylene groups.

In the laminate of the present invention, printing may be performed on the first polyolefin layer. The printing is preferably performed with UV ink, and it is preferable that the printed portion is not peeled off when the surface of the printed portion is to be peeled off with cellophane tape (registered trademark). Printing can be performed by, for example, flexographic printing, resin letterpress printing, or the like.

<Base layer>
The base material layer can give elasticity to the laminated body of the present invention and can be used as a base material when laminating each layer. The type of the base material layer is not particularly limited as long as the above object can be achieved, and for example, a polyvinyl chloride film, a vinylidene chloride film, a polychlorotrifluoroethylene film, a polytetrafluoroethylene film, saturated or unsaturated. Saturated polyester film, polyamide film, polyacrylonitrile film, and two or more laminates thereof can be mentioned, and polyethylene terephthalate (PET) film can be mentioned in particular. These films may have an inorganic oxide vapor deposition layer, for example a silica vapor deposition layer.

The thickness of the base material layer is not particularly limited as long as the above object can be achieved, but may be, for example, 5 μm or more, 8 μm or more, or 10 μm or more, and 100 μm or less, 50 μm or less, 30 μm or less, or 20 μm or less. It may be there.

<Heat seal layer>
The heat seal layers are not particularly limited as long as they can be adhered by overlapping and pressing each other to bring the temperature in the range of 80 to 250 ° C. In particular, the layer is not particularly limited as long as it can be heat-sealed for 1.0 second under the conditions of 140 ° C. and 0.2 MPa and can be adhered with a strength useful as a package.

Examples of such a heat-sealing layer include a polyolefin layer, and examples thereof include the same types of polyolefins that can be used in the above-mentioned ultraviolet absorbing layer.

The thickness of the heat seal layer may be 15 μm or more, 30 μm or more, or 50 μm or more, and may be 200 μm or less or 140 μm or less.

It is preferable that the surface of the heat seal layer can be printed. The printing is preferably performed with UV ink, and it is preferable that the printed portion is not peeled off when the surface of the printed portion is to be peeled off with cellophane tape (registered trademark). Printing can be performed by, for example, flexographic printing, resin letterpress printing, or the like.

<< Manufacturing method of packaging laminate >>
The method for producing the above-mentioned packaging laminate containing the first polyolefin layer, the ultraviolet absorbing layer containing the organic ultraviolet absorber and polyolefin, and the second polyolefin layer is not particularly limited. For example, the packaging laminate of the present invention can be produced by subjecting the materials of the above layers to various molding methods such as casting method, inflation method, calender molding method, T-die method, coextrusion molding and the like.

Further, the ultraviolet absorbing layer is formed on a film by an inflation method, a T-die method, or a calender molding method, and the first polyolefin layer and the second polyolefin layer are formed into a film by these methods and then laminated with the ultraviolet absorbing layer. Thereby, the laminate of the present invention can also be produced. In this case, each layer can be formed at a temperature of 150 ° C. or higher, 180 ° C. or higher, or 200 ° C. or higher, and 350 ° C. or lower, 330 ° C. or lower, or 300 ° C. or lower, depending on the material used. ..

As the kneading of the materials used in the ultraviolet absorbing layer, for example, a batch type kneader such as a kneader, a Banbury mixer, or a mixing roll, or a continuous kneader such as a twin-screw kneader can be used. In this case, depending on the material used, the temperature can be 100 ° C. or higher, 120 ° C. or higher, or 140 ° C. or higher, and kneading can be performed at 220 ° C. or lower, 200 ° C. or lower, or 180 ° C. or lower. it can.

Particularly preferably, in the laminate of the present invention, a molten resin composition containing an ultraviolet absorber and a polyolefin is extruded between the second polyolefin layer laminated on the base material layer and the first polyolefin layer. , It is preferable to form an ultraviolet absorbing layer by sandwich lamination. In order to secure the thickness of the ultraviolet absorbing layer, the ultraviolet absorbing layer is extruded onto the first polyolefin layer or the second polyolefin layer to form a first laminate by laminating, and further, the ultraviolet absorber and the polyolefin are added. By laminating the molten resin composition containing the mixture between the first laminate and the second polyolefin layer by sandwich lamination, a thick ultraviolet absorbing layer can be formed. In this case, the first polyolefin layer and the second polyolefin layer can be replaced.

《Package》
The packaging body of the present invention is formed by using the above-mentioned packaging laminate. The packaging body of the present invention has the above-mentioned packaging laminate on at least one surface of the packaging body.

Preferably, the above-mentioned packaging laminate having heat-sealing properties on the upper and lower surfaces is formed into a tubular shape, and the tubular molded body is formed by stacking the above-mentioned packaging laminates on the upper and lower surfaces and heat-sealing them. Then, both ends of the obtained tubular molded body can be sealed to obtain a package. In this case, a shoulder portion may be formed on one side of the tubular molded body so that a cap can be attached, or parts constituting the shoulder portion may be attached to the tubular molded body.

The package of the present invention is preferably a tubular package, particularly a laminated tube. When the above-mentioned laminate is used, the stiffness of the laminate can be adjusted by the base material layer, so that a rigid laminate tube can be formed.

For example, the tubular package of the present invention has an indenter of φ25 mm, a push-in of 20 mm, and a push-in speed of 3.3 mm / min, and has a stress of 1500 mN or more when measured using Loop Stef Nestester DA (Toyo Seiki Seisakusho Co., Ltd.). It may be 1800 mN or more, 4000 mN or less, 3000 mN or less, or 2500 mN or less.

The package of the present invention can contain contents such as solids, liquids and gels. For example, the package of the present invention can contain contents such as foods, chemicals, cosmetics, and detergents, and can particularly contain cosmetics.

<< Sample preparation >>
The following films, materials, etc. were used to form the laminate.
First and second polyolefin layers and heat seal layer: LLDPE film (L-100N, Aicello Corporation)
Polyolefin for UV absorption layer: LDPE (Suntech L1850K, Asahi Kasei Chemicals Co., Ltd.)
UV absorber: Benzotriazole compound (TINUVIN326, BASF Japan Ltd.)
Base material layer: PET film (E5200, Toyobo Co., Ltd.)
Adhesive layer for dry lamination: Main agent (TM277, Toyo Morton Co., Ltd.) / Hardener (CAT-RT86, Toyo Morton Co., Ltd.)

When the ultraviolet absorbing layer of 70 μm or less was formed, it was formed by sandwich lamination with the first and second polyolefin layers. When forming an ultraviolet absorbing layer having a thickness of more than 70 μm, the ultraviolet absorbing layer is once extruded into the second polyolefin layer to form a laminated body having the ultraviolet absorbing layer, and finally the laminated body and the first polyolefin layer are formed. Then, the molten resin composition containing the ultraviolet absorber and the polyolefin was sandwich-laminated to secure the thickness of the ultraviolet absorbing layer.

When adhering the PET film to another film, the amount of the above-mentioned dry laminating adhesive applied was 3.5 g / m ² .

In this way, the laminates of Examples 1 to 6 and Comparative Examples 1 and 2 shown in Table 1 were prepared. In Example 4, instead of the heat-sealing layer, a laminate in which the ultraviolet absorbing layer was sandwich-laminated with the first and second polyolefin layers was used. The laminate of Example 4 contains two UV absorbing layers, but the concentration of the UV absorber was the same for the two UV absorbing layers. A pattern was printed on these surfaces by flexographic printing using UV ink to form a tube-shaped package. The pattern is printed on the heat seal layer in Examples 1 to 3, 5 to 6 and Comparative Example 1; and printed on the first polyolefin layer in Examples 4 and 7; Comparative Example. In 2, it went to the ultraviolet absorption layer. Moreover, the laminated body of Example 7 was produced without using the PET film which is a base material layer.

"Evaluation methods"
The light transmittances of the laminates of Examples 1 to 7 and Comparative Examples 1 and 2 at wavelengths of 350 nm, 380 nm, and 450 nm were measured using a spectrophotometer U-4000 (Hitachi High-Technologies Corporation). For a wavelength of 350 nm, a transmittance of 3% or less is marked with ◯, a transmittance of more than 3% and 5% or less is marked with Δ, and a transmittance of more than 5% is marked with x; for a wavelength of 380 nm, the wavelength is marked with x. When the transmittance is 10% or less, it is marked with ◯, when the transmittance is more than 10% and 20% or less, it is marked with Δ, and when the transmittance is more than 20%, it is marked with ×; for a wavelength of 450 nm, the transmittance is 75%. The case of the above was evaluated as ◯, and the case of the transmittance of less than 75% was evaluated as x.

With respect to the laminates of Examples 1 to 7 and Comparative Example 1, the laminate strength of the first polyolefin layer, the ultraviolet absorbing layer and the second polyolefin layer was determined by a T-shaped peeling test method using Strophgraph VE10D (Toyo Seiki Seisakusho Co., Ltd.). It was measured at a pulling speed of 300 mm / min with a distance between gripping jigs of 50 mm. When the laminate strength was 5.0 N / 15 mm or more, the interlayer strength was set to ◯, and when it was less than 5.0 N / 15 mm, the interlayer strength was set to x.

Cellotape (registered trademark) was pressed against the printed pattern with a finger, and the printability of the surface of the laminate was tested by checking whether the pattern was peeled off. When the pattern did not peel off, the printability was marked as ◯, and when the pattern peeled off, the printability was marked as x.

The rigidity of the tubular package composed of the laminates of Examples 1 to 7 and Comparative Examples 1 and 2 was measured using Loop Stef Nestester DA (Toyo Seiki Seisakusho Co., Ltd.). The measured stress was defined as x for 1500 mN or less, Δ for less than 1500-2000 mN, and ◯ for 2000 mN or more.

"result"
The results are shown in the table below.

In Comparative Example 1, since the polyolefin layer is sufficiently thick, bleed-out is not performed, but since the concentration of the ultraviolet absorber is high, the light transmission in the visible region deteriorates, and the polyolefin layer and the ultraviolet absorbing layer also deteriorate. The interlayer strength with and is deteriorated. In Comparative Example 2, since the ultraviolet absorbing layer is exposed, the ultraviolet absorber bleeds out and the printability is deteriorated.

From the above results, by lowering the concentration of the UV absorber and making the UV absorption layer sufficiently thick, a laminate that is transparent, has sufficient UV absorption performance, has high interlayer strength, and does not bleed out can be obtained. It turned out to be obtained. Further, when comparing Example 1 and Example 7, it can be seen that the light transmittance at 350 nm is lowered in Example 1, and that the ultraviolet rays can be further cut by providing the base material layer.

1 First polyolefin layer 2 Second polyolefin layer 3 Ultraviolet absorption layer 4 Base material layer 5 Heat seal layer 10 Laminate

Claims (12)

The first polyolefin layer, an ultraviolet absorbing layer containing an organic ultraviolet absorber and a polyolefin, and a second polyolefin layer in this order, a packing wear laminate,
The thickness of the first polyolefin layer, the ultraviolet absorbing layer, and the second polyolefin layer is more than 25 μm, respectively .
The content of the organic UV absorber, Ri 0.25-1.0 wt% der respect to the ultraviolet absorbing layer, and
The thickness of the ultraviolet absorbing layer is 60 μm or more.
Laminate for packaging. The first polyolefin layer, an ultraviolet absorbing layer containing an organic ultraviolet absorber and a polyolefin, and a second polyolefin layer in this order, a packing wear laminate,
The thickness of the first polyolefin layer, the ultraviolet absorbing layer, and the second polyolefin layer is more than 25 μm, respectively .
The content of the organic UV absorber, Ri 0.01-2.0 wt% der respect to the ultraviolet absorbing layer, and
The total thickness of the first polyolefin layer, the ultraviolet absorbing layer, and the second polyolefin layer is 200 μm or more and 500 μm or less.
Laminate for packaging. The first polyolefin layer, an ultraviolet absorbing layer containing an organic ultraviolet absorber and a polyolefin, and a second polyolefin layer in this order, a packing wear laminate,
The thickness of the first polyolefin layer, the ultraviolet absorbing layer, and the second polyolefin layer is more than 25 μm, respectively .
The content of the organic UV absorber, Ri 0.01-2.0 wt% der respect to the ultraviolet absorbing layer, and
The lamination strength between the first polyolefin layer and the ultraviolet absorbing layer and the lamination strength between the ultraviolet absorbing layer and the second polyolefin layer are 5.0 N / 15 mm or more, respectively.
Laminate for packaging. The first polyolefin layer, an ultraviolet absorbing layer containing an organic ultraviolet absorber and a polyolefin, and a second polyolefin layer in this order, a packing wear laminate,
The thickness of the first polyolefin layer, the ultraviolet absorbing layer, and the second polyolefin layer is more than 25 μm, respectively .
The content of the organic UV absorber, Ri 0.01-2.0 wt% der respect to the ultraviolet absorbing layer, and
Laminated on the second polyolefin layer, and further includes a base material layer and a heat seal layer in this order.
Laminate for packaging. The first polyolefin layer, an ultraviolet absorbing layer containing an organic ultraviolet absorber and a polyolefin, the second polyolefin layer, the base layer, the second polyolefin layer, ultraviolet absorbing layer, and viewed including the ultraviolet absorbing layer in this order, it Accordingly, the base layer is sandwiched by two the second polyolefin layer, a packing wear laminate,
The thickness of the first polyolefin layer, the ultraviolet absorbing layer, and the second polyolefin layer are each more than 25 μm, and the content of the organic ultraviolet absorber is 0 with respect to the ultraviolet absorbing layer. 0.01-2.0% by weight,
Laminate for packaging. The packaging laminate according to claim 4 or 5 , wherein the total thickness of all the layers is more than 300 μm. The base material layer is a polyvinyl chloride film, a polyvinylidene chloride film, a polychlorotrifluoroethylene film, a polytetrafluoroethylene film, a saturated or unsaturated polyester film, a polyamide film, a polyacrylonitrile film, and two or more laminates thereof. The packaging laminate according to any one of claims 4 to 6 , which is selected from the group consisting of bodies. The first polyolefin layer, an ultraviolet absorbing layer containing an organic ultraviolet absorber and a polyolefin, and a second polyolefin layer in this order, a packing wear laminate,
The thickness of the first polyolefin layer, the ultraviolet absorbing layer, and the second polyolefin layer is more than 25 μm, respectively .
The content of the organic UV absorber, Ri 0.01-2.0 wt% der respect to the ultraviolet absorbing layer, and
The light transmittance at a wavelength of 380 nm is 10% or less, and the light transmittance at a wavelength of 450 nm is 75% or more.
Laminate for packaging. The packaging laminate according to any one of claims 1 to 8, wherein the thickness of the first polyolefin layer and the thickness of the second polyolefin layer are 30 μm or more, respectively. The packaging laminate according to any one of claims 1 to 9 , wherein no adhesive for dry lamination is present between the first polyolefin layer, the ultraviolet absorbing layer, and the second polyolefin layer. body. A tube packaging body formed by using the packaging laminate according to any one of claims 1 to 10 . A molten resin composition containing an organic ultraviolet absorber and a polyolefin is extruded into the first polyolefin layer to form an ultraviolet absorbing layer to form a first laminated body, and with the first laminated body. The method for producing a laminate for packaging according to any one of claims 1 to 11 , which comprises sandwich-laminating a molten resin composition containing an ultraviolet absorber and a polyolefin with a second polyolefin layer.

Images