JP2020138506A - Laminate, package, and packaging article - Google Patents

Abstract

To provide a laminate and a package which has a sealant layer exhibiting low adsorptivity to a content medicinal component of medicine such as a patch, can be easily opened when sealants are heat-sealed, and can leave a trace after opening.SOLUTION: A laminate 1 includes at least a base material layer 11, an adhesive layer 12 and a sealant layer 13, in which the sealant layer 13 is composed of a cyclic polyolefin-based resin and a polybutene resin, a ratio of the cyclic polyolefin-based resin in the sealant layer 13 is 60-95 mass%, and a ratio of the polybutene resin in the sealant layer is 5-40 mass%.SELECTED DRAWING: Figure 1

Description

The present invention relates to a laminate, a package, and a packaged article, which are difficult to adsorb the contents components of pharmaceuticals, foods, cosmetics, etc., can be easily opened, and can leave a trace of opening.

In the laminate used as a packaging material or the like, a thermoplastic resin is used for the sealant layer. As the thermoplastic resin, polyethylene resin, polypropylene resin, or the like is particularly used because of its excellent laminating property and heat-sealing property.

However, while these resins can achieve high adhesion strength in heat sealing, they easily adsorb components contained in foods, pharmaceuticals, and the like. Therefore, a package containing a sealant layer made of these resins so as to be in contact with a space for accommodating the contents tends to deteriorate or deteriorate the contents.

For this reason, polyacrylonitrile-based resins, which are non-adsorbent materials, have been used for the sealant layer in laminates used for packaging foods and pharmaceuticals. However, stable procurement of polyacrylonitrile-based resin films is difficult, and it has become necessary to search for alternative materials for polyacrylonitrile-based resins.

Patent Document 1 describes a packaging bag that is suitable for high-speed filling and packaging and has extremely little adsorption of volatile components derived from the contents. This packaging bag is made of a laminated material in which a base material layer, a low-density polyethylene resin layer, and a cyclic polyolefin resin layer are laminated in this order. In this document, a structure is adopted in which the thickness ratio of the low-density polyethylene resin layer and the cyclic polyolefin resin layer is in the range of 20: 1 to 2: 1. With this structure, it is possible to fill the contents at high speed.

An object of the invention described in Patent Document 2 is to provide a packaging bag and a packaging container having a sealant layer having excellent film-forming property, non-adsorption property and heat-sealing property. In this document, in order to achieve the above object, a base material layer, a linear low-density polyethylene resin layer and a cyclic polyolefin resin layer are provided in this order in a packaging bag or a lid material of a packaging container, and the cyclic polyolefin is provided. It is described that a laminate having a predetermined composition is used as the based resin. In the present invention, a linear low-density polyethylene resin and a cyclic polyolefin resin are used as the sealant layer.

In pharmaceutical packaging, the user can easily open the package, and in order to prevent foreign substances and poisons from being intentionally mixed in during distribution, it is easy to check whether the package is opened or not from the appearance of the sales packaging unit. It is required to make a trace of opening at the time of sealing so that it can be easily discriminated and if there is any doubt about the state of sealing.

In the field of food packaging, the required quality of lid materials for cup containers such as instant noodles, jellies, and yogurts is that the innermost sealant layer of the lid material and the container such as the cup, which is the adherend, are used to protect the contents. While strong adhesion is desired, there are conflicting demands for opening with as little force as possible at the time of opening, and various functions have been imparted to the lid material in order to satisfy such demands. One of them is the design of the easy-opening function, and examples thereof include an interface peeling mechanism, a delamination mechanism, and a cohesive peeling mechanism.

Of these, the cohesive peeling mechanism is designed by blending an incompatible or partially compatible thermoplastic resin, and the principle of the separation is the cohesive force of the incompatible or partially compatible thermoplastic resin blend layer. Taking advantage of its small size, it is explained by utilizing the cohesive failure of such an incompatible or partially compatible blend layer at the time of opening, instead of the interface between the innermost sealant of the lid material and the adherend.

In the invention described in Patent Document 3, the sealant layer is formed from a matrix-domain structure in which polyethylene resin is used for the matrix that occupies most of this layer and polybutene resin is used for the partially present domain. With the above-mentioned coagulation peeling mechanism, it is possible to have an easy-opening function and leave a peeling mark of opening.

Japanese Patent No. 5061644 Japanese Patent No. 5930577 Japanese Patent No. 5582669

However, none of the above documents has the characteristics that the volatile components derived from the contents are difficult to be adsorbed and can be easily peeled off.

Therefore, according to the present invention, the sealant layer exhibits low adsorptivity to the medicinal properties of the contents of the drug such as a patch, and when the sealant layers are heat-sealed, the sealant layer can be easily opened and a trace after opening. It is an object of the present invention to provide a laminate and a package that can be compatible with each other, and a packaged article using the same.

The present invention has been made in view of the above problems, and the invention of claim 1 is based on the present invention.
A laminate including at least a base material layer, an adhesive layer, and a sealant layer.
The sealant layer is composed of a cyclic polyolefin resin and a polybutene resin.
The ratio of the cyclic polyolefin resin in the sealant layer is 60% by mass to 95% by mass, and the ratio of the polybutene resin in the sealant layer is 5% by mass to 40% by mass.
It is a laminated body characterized by this.

The invention of claim 2 of the present invention is
The glass transition temperature of the cyclic polyolefin resin is 60 ° C. to 100 ° C.
The laminate according to claim 1, wherein the polybutene resin has a melting point of 100 ° C. or higher.

The invention of claim 3 of the present invention is
The laminate according to claim 1 or 2, wherein a barrier layer is further provided between the base material layer and the adhesive layer.

The invention of claim 4 of the present invention is
The laminate according to any one of claims 1 to 3, wherein the barrier layer includes a metal foil layer or a layer containing a thin film of metal or metal oxide.

The invention of claim 5 of the present invention is
In the laminate according to any one of claims 1 to 4,
A method for producing a laminate, wherein the sealant layer is formed by any of an extrusion lamination method, a casting method, and an inflation method.

The invention of claim 6 of the present invention is
A package made by using the laminate according to any one of claims 1 to 4.

The invention of claim 7 of the present invention is
A packaged article including the package according to claim 6 and the contents contained therein.

According to the laminate of the present invention, the sealant layer is formed by blending a cyclic polyolefin resin and a polybutene resin, so that, for example, it exhibits excellent low adsorptivity to the medicinal properties of a patch and is a coagulation peeling type. It is possible to provide a laminated body which has easy-opening property as a sealant and can leave a trace of opening.

It is explanatory drawing which shows an example of embodiment of the laminated body of this invention schematically in cross section. It is explanatory drawing which shows an example of another embodiment of the laminated body of this invention schematically in cross section.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view schematically showing a laminated body according to an embodiment of the present invention.
The laminate 1 shown in FIG. 1 is used, for example, as a packaging material. Further, this laminate can also be used for applications other than packaging materials, for example, as a cover film for covering the surface of a push button of an electronic device or the like.

The laminated body 1 includes a base material layer 11, an adhesive layer 12, and a sealant layer 13, and is laminated. Hereinafter, each layer will be described in detail.

The base material layer 11 is not particularly limited and may be selected according to the intended use, but paper, a resin film, a combination thereof, or the like is used. As the resin film, for example, a biaxially stretched polypropylene film, a biaxially stretched polyester film, a biaxially stretched nylon film, or cellophane can be used.
The thickness of the resin film is not particularly limited, but when used as a package, for example, it is preferably in the range of 3 μm to 200 μm, and more preferably in the range of 6 μm to 30 μm.

A printing layer may be provided on the main surface of the base material layer 11 depending on the intended use. The printing layer may be provided on the main surface of the base material layer 11 on the adhesive layer 12 side, on the back surface thereof, or on both of them.

As a method for forming the laminated body 1, there is a method of extruding and laminating the base material layer 11 and the sealant layer 13 via the adhesive layer 12.

For the adhesive layer 12, an adhesive for dry lamination or extrusion lamination, or an adhesive resin may be used. The dry laminating adhesive is, for example, a solvent type adhesive or a solventless type adhesive. The solvent-based adhesive is, for example, a urethane-based adhesive or an acrylic-based adhesive. The urethane-based adhesive is, for example, a two-component reaction type polyurethane-based adhesive.

The adhesive for extrusion lamination is, for example, a solvent type anchor coating agent. The solvent-based anchor coating agent is, for example, a urethane-based or imine-based anchor coating agent. The urethane-based anchor coating agent is, for example, a two-component reaction type polyurethane-based anchor coating agent.
The thickness of the adhesive after applying the above-mentioned adhesive for laminating and drying is, for example, in the range of 0.1 μm to 10 μm.

The adhesive resin is, for example, polyethylene or an ethylene-methacrylic acid copolymer. The thickness of the adhesive resin is, for example, in the range of 5 μm to 30 μm.

The laminate 1 may further include a barrier layer between the base material layer 11 and the sealant layer 13. The barrier layer is a metal foil layer or a layer containing a thin film of metal or metal oxide.

As the metal foil, for example, an aluminum foil is used, and the base material layer 11 and the sealant layer 13 can be bonded to each other with or without an adhesive layer by the above-mentioned dry laminating method or extrusion laminating method.
When an aluminum foil is used, its thickness is preferably in the range of 5 μm to 15 μm, and more preferably in the range of 5 μm to 9 μm. If the aluminum foil is too thin, it becomes difficult to handle it when it is attached to the base material layer 11. If the aluminum foil is made excessively thick, it is not expected that the barrier property will be improved as the thickness increases, and as a result, the cost will increase. Further, in this case, the flexibility of the laminated body 1 is reduced, and the laminated body 1 becomes difficult to handle.

The thin film of metal or metal oxide is, for example, aluminum, aluminum oxide, silicon oxide or magnesium oxide, and can be fixed to the base material layer 11 by means such as a vacuum deposition method or a sputtering method. As the base material layer 11, a metal or metal oxide vapor-deposited film as described above can be used.

When visibility of the contents is required, the vapor-deposited film is preferably formed with a highly transparent metal oxide thin film. The thickness of the metal oxide thin film is preferably in the range of 5 nm to 300 nm, and more preferably in the range of 10 nm to 150 nm.
If the thickness of the metal oxide thin film is less than 5 nm, it may not be able to sufficiently exhibit performance such as gas barrier properties. On the other hand, if it exceeds 300 nm, cracks may occur in the inorganic oxide thin film when the laminate 1 is bent or pulled, and similarly sufficient performance may not be exhibited.

In the laminate according to the present invention, the sealant layer has non-adsorptive properties to chemical components derived from the contents, and when the laminate is used as a package, it is easy to open and leaves traces after opening. The present inventor has the following configuration in order to achieve both functions.

That is, the sealant layer 13 in the laminate according to the present invention has a coagulation peeling type sealant layer made of a resin obtained by blending a cyclic polyolefin resin with a polybutene resin. Since it is a coagulation peeling type sealant, it can be easily opened and a trace of peeling can be left at the time of peeling, and can have a virgin property of opening when used as a package.

In order to give the sealant layer 13 low adsorptivity, the cyclic polyolefin resin occupies 60% by mass to 95% by mass of the sealant layer 13.

The cyclic polyolefin resin is a ring-opening metathesis polymer (COP) obtained by polymerizing a cyclic olefin by a ring-opening metathesis polymerization reaction, or a copolymer of a cyclic olefin and an α-olefin (chain olefin), that is, a cyclic olefin copolymer (COC). , Or a mixture thereof.

As the cyclic olefin, any cyclic hydrocarbon having an ethylene-based unsaturated bond and a bicyclo ring can be used. The cyclic olefin is particularly preferably one having a bicyclo [2.2.1] hepta-2-ene (norbornene) skeleton.

As the cyclic polyolefin-based resin obtained from the cyclic polyolefin having a norbornene skeleton, for example, a ring-opening metathesis polymer (COP) of a norbornene-based monomer can be used. Examples of commercially available products of such ring-opening metathesis polymers include "ZEONOR (registered trademark)" manufactured by Nippon Zeon Corporation.

Further, for example, a norbornene-based cyclic olefin copolymer (COC) can be used. Commercially available products of such COC include, for example, "APAS (registered trademark)" manufactured by Mitsui Chemicals, Inc. and "TOPAS (registered trademark)" manufactured by TOPAS ADVANCED POLYMERS GmbH and sold by Polyplastics Co., Ltd. ) ”.

Further suitable cyclic olefin resins preferably have a glass transition temperature in the range of, for example, 60 ° C to 100 ° C.

In order to achieve both low adsorption performance as the sealant layer 13 and easy-opening performance, it is necessary to add an appropriate amount of a resin completely incompatible with or partially compatible with the cyclic polyolefin resin to the cyclic polyolefin resin. There is.

As the completely incompatible or partially compatible resin, polybutene resin is most suitable.
As the polybutene resin, in addition to the homopolymer of 1-butene, a copolymer of 1-butene and α-olefins such as ethylene, propylene, 1-pentene and 1-hexene can be used, and the polybutene resin can be used. By using a resin having a melting point of 100 ° C. or higher, it is possible to prevent a decrease in peel strength under high temperature and high humidity.

The sealant layer 13 can further contain an additive as an optional component. The additive can be arbitrarily selected from, for example, a lubricant, an antioxidant, an ultraviolet absorber, a light stabilizer, an antistatic agent, an antiblocking agent, a flame retardant, a cross-linking agent, and a colorant.
As the lubricant, for example, a higher fatty acid metal salt, an aliphatic alcohol, a polyglycol, a triglyceride, a wax, a phenolic compound, or a mixture containing one or more of them is preferably used for the purpose of improving processability. can do. The wax may be a naturally occurring wax, for example, a mineral wax such as Montan wax, or a synthetic wax such as polyethylene wax.

The thickness of the sealant layer 13 is in the range of 10 μm to 40 μm, preferably in the range of 15 μm to 40 μm, and more preferably in the range of 30 μm to 40 μm. If the thickness of the sealant layer 13 is less than 10 μm, sufficient initial seal strength may not be achieved, or the deterioration of seal strength during long-term storage may become significant. If the thickness of the sealant layer 13 exceeds 40 μm, it will be over-designed in many applications, which is disadvantageous in terms of cost.

Various methods can be used for manufacturing the laminate according to the present invention, but basically, if necessary, the laminate is laminated in advance by a method such as dry lamination or extrusion lamination as a base material. , The method of extruding and laminating the thermoplastic resin of the sealant layer 13 described above is adopted.

FIG. 2 is a cross-sectional view schematically showing a laminated body 1a according to another embodiment of the present invention, and is an embodiment including the above-mentioned barrier layer. The laminate 1a is manufactured by laminating the base material layer 11 and the barrier layer 14 via the adhesive layer 12a, and further laminating the opposite surface of the barrier layer 14 and the sealant layer 13 via the adhesive layer 12b. ..

Examples and comparative examples of the present invention are shown below, but the scope of rights of the present invention is not limited thereto.

<Example 1>
A laminated body including the base material layer 11, the barrier layer 14, the adhesive layers 12a and 12b, and the sealant layer 13 was produced by the following method, and a packaged article was produced using this laminated body.

First, as the base material layer 11, a biaxially stretched polyethylene terephthalate film (PET) having a thickness of 12 μm was prepared. As the barrier layer 14, an aluminum foil having a thickness of 7 μm was prepared.

Next, a two-component polyurethane adhesive was applied as the adhesive layer 12a to one main surface of the base material layer, and the base material layer 11 and the barrier layer 14 were dry-laminated with the adhesive layer 12a interposed therebetween.

Next, a two-component polyurethane anchor coating agent was applied as the adhesive layer 12b to the surface of the barrier layer 14 opposite to the base material layer, and then the sealant layer 13 was formed by an extrusion laminating method. Here, the thickness of the sealant layer 13 was set to 30 μm.

The sealant layer 13 is a cyclic olefin copolymer (COC) resin (melt flow rate 1.8 g / 10 min (190 ° C. / 2.16 kg), density 1.01 g / cm ³ , glass transition temperature 78 ° C., TOPAS ADVANCED POLYMERS GmbH. TOPAS 8007 ") 70% by mass, polybutene resin (melt flow rate 1.8 g / 10 min (190 ° C / 2.16 kg), density 0.910 g / cm ³ , melting point 125 ° C," BL4000 "manufactured by Mitsui Chemicals, Inc.) Contains 30% by mass.

It is desirable that the resin used for the sealant layer be dry-blended in advance with a blender such as a tumbler mixer in order to improve the dispersibility of the polybutene resin with respect to the COC resin. Further, a melt blend may be appropriately used for the purpose of stabilizing the dispersed state. Further, for the purpose of improving the adhesion between the sealant layer 13 and the adhesive layer 12a, ozone treatment can be performed at the time of extrusion lamination.
As described above, the laminated body 1a was manufactured.

Next, using the above-mentioned laminate 1a, a packaging bag containing the contents of a patch containing 2 mg of tulobuterol as a drug component was produced. The packaging bag had a vertical dimension of 110 mm and a horizontal dimension of 60 mm, and was manufactured by heat-sealing on all sides under the conditions of 170 ° C., 0.2 MPa, 1 second, and a seal width of 5 mm.

<Example 2>
As the sealant layer 13, COC resin (melt flow rate 1.8 g / 10 min (190 ° C. / 2.16 kg), density 1.01 g / cm ³ , glass transition temperature 78 ° C., TOPAS ADVANCED POLYMERS GmbH "TOPAS 8007") is used. 40% by mass of polybutene resin (melt flow rate 1.8 g / 10 min (190 ° C. / 2.16 kg), density 0.910 g / cm ³ , melting point 125 ° C., "BL4000" manufactured by Mitsui Chemicals, Inc.) was used. A laminate 1a was produced by the same method as in Example 1 except for the above, and a packaging bag containing the same patch contents as in Example 1 was produced.

<Example 3>
As the sealant layer 13, COC resin (melt flow rate 1.8 g / 10 min (190 ° C. / 2.16 kg), density 1.01 g / cm ³ , glass transition temperature 78 ° C., TOPAS ADVANCED POLYMERS GmbH "TOPAS 8007") is used. 95% by mass, 5% by mass of polybutene resin (melt flow rate 1.8 g / 10 min (190 ° C. / 2.16 kg), density 0.910 g / cm ³ , melting point 125 ° C., Mitsui Chemicals Co., Ltd. "BL4000") was used. A laminate 1a was produced by the same method as in Example 1 except for the above, and a packaging bag containing the same patch contents as in Example 1 was produced.

<Example 4>
As the sealant layer 13, COC resin (melt flow rate 0.9 g / 10 min (190 ° C. / 2.16 kg), density 1.01 g / cm ³ , glass transition temperature 65 ° C., TOPAS ADVANCED POLYMERS GmbH "TOPAS 9506") is used. 70% by mass, 30% by mass of polybutene resin (melt flow rate 1.8 g / 10 min (190 ° C. / 2.16 kg), density 0.910 g / cm ³ , melting point 125 ° C., Mitsui Chemicals Co., Ltd. "BL4000") was used. A laminate 1a was produced by the same method as in Example 1 except for the above, and a packaging bag containing the same patch contents as in Example 1 was produced.

<Comparative example 1>
As the sealant layer 13, 70% by mass of a low-density polyethylene resin (melt flow rate 7.0 g / 10 min (190 ° C. / 2.16 kg), density 0.918 g / cm ³ , "LC600A" manufactured by Japan Polyethylene Corporation), polybutene resin. Example 1 except that 30% by mass of (melt flow rate 1.8 g / 10 min (190 ° C. / 2.16 kg), density 0.910 g / cm ³ , melting point 125 ° C., Mitsui Chemicals Co., Ltd. "BL4000") was used. The laminate 1a was produced by the same method as in the above, and a packaging bag containing the same patch contents as in Example 1 was produced.

<Comparative example 2>
As the sealant layer 13, a COC resin (melt flow rate 1.8 g / 10 min (190 ° C. / 2.16 kg), density 1.01 g / cm ³ , glass transition temperature 78 ° C., TOPAS ADVANCED POLYMERS GmbH "TOPAS 8007") was used. Except for using 70% by mass, low density polyethylene resin (melt flow rate 7.0 g / 10 min (190 ° C / 2.16 kg), density 0.918 g / cm ³ , "LC600A" manufactured by Japan Polyethylene Corporation) in 30% by mass. The laminated body 1a was produced by the same method as in Example 1, and a packaging bag containing the same patch contents as in Example 1 was produced.

<Comparative example 3>
As the sealant layer 13, COC resin (melt flow rate 1.8 g / 10 min (190 ° C. / 2.16 kg), density 1.01 g / cm ³ , glass transition temperature 78 ° C., TOPAS ADVANCED POLYMERS GmbH "TOPAS 8007") was used. The laminate 1a was produced by the same method as in Example 1 except that 100% by mass was used, and a packaging bag containing the same patch contents as in Example 1 was produced.

<Comparative example 4>
As the sealant layer 13, COC resin (melt flow rate 1.8 g / 10 min (190 ° C. / 2.16 kg), density 1.01 g / cm ³ , glass transition temperature 78 ° C., TOPAS ADVANCED POLYMERS GmbH "TOPAS 8007") is used. 55% by mass, 45% by mass of polybutene resin (melt flow rate 1.8 g / 10 min (190 ° C. / 2.16 kg), density 0.910 g / cm ³ , melting point 125 ° C., "BL4000" manufactured by Mitsui Chemicals, Inc.) was used. A laminate 1a was produced by the same method as in Example 1 except for the above, and a packaging bag containing the same patch contents as in Example 1 was produced.

<Comparative example 5>
As the sealant layer 13, COC resin (melt flow rate 0.7 g / 10 min (190 ° C. / 2.16 kg), density 1.02 g / cm ³ , glass transition temperature 110 ° C., TOPAS ADVANCED POLYMERS GmbH "TOPAS 7010") is used. 70% by mass, 30% by mass of polybutene resin (melt flow rate 1.8 g / 10 min (190 ° C. / 2.16 kg), density 0.910 g / cm ³ , melting point 125 ° C., Mitsui Chemicals Co., Ltd. "BL4000") was used. A laminate 1a was produced by the same method as in Example 1 except for the above, and a packaging bag containing the same patch contents as in Example 1 was produced.

<Comparative Example 6>
As the sealant layer 13, COC resin (melt flow rate 1.8 g / 10 min (190 ° C. / 2.16 kg), density 1.01 g / cm ³ , glass transition temperature 78 ° C., TOPAS ADVANCED POLYMERS GmbH "TOPAS 8007") was used. 70% by mass, 30% by mass of polybutene resin (melt flow rate 4.0 g / 10 min (190 ° C. / 2.16 kg), density 0.910 g / cm ³ , melting point 58 ° C., "BL2481" manufactured by Mitsui Chemicals, Inc.) was used. A laminate 1a was produced by the same method as in Example 1 except for the above, and a packaging bag containing the same patch contents as in Example 1 was produced.

<Evaluation items>
(Evaluation of low drug adsorption)
The packaging bags according to Examples 1 to 4 and Comparative Examples 1 to 6 were left to stand for 6 months in an environment of 40 ° C. and 75% RH. Next, after taking out the contents of the patch from the packaging bag, the packaging bag was cut into small pieces and immersed in methanol to obtain a solution from which tulobuterol, which is a drug component, was extracted.
Next, the tulobuterol extract was analyzed by high performance liquid chromatography to quantify the amount of tulobuterol adsorbed on the packaging bag. Based on this, the amount of tulobuterol adsorbed per unit area of the packaging bag was calculated.

(Easy opening evaluation of the bag)
With respect to the packaging bags according to Examples 1 to 4 and Comparative Examples 1 to 6, a strip-shaped test piece having a width of 15 mm was cut out, and the test piece was used as a "heat seal strength test of the bag" described in JIS Z0238: 1998. The heat seal strength was measured according to the above. The heat seal strength was measured using a Tensilon universal material tester (manufactured by A & D Co., Ltd.) at a tensile speed of 300 mm / min. The heat seal strength in the above test and the state at the time of opening were observed, and the easy opening property of the bag was evaluated.

Table 1 below shows the evaluation results of low drug adsorption and easy bag opening.
In the column described as "drug low adsorption" in Table 1, "◎" indicates that the active ingredient of the patch was hardly adsorbed on the package, and "○" indicates that the active ingredient of the patch was hardly adsorbed. It means that only a small amount was adsorbed on the package, and "x" indicates that the active ingredient of the patch was adsorbed on the package in a relatively large amount.

In addition, in the column labeled "Easy to open the bag", "◎" indicates that the packaging bag could be easily opened and a trace of opening could be left, and "○" indicates that the packaging could be left. It means that the bag could be opened relatively easily and it was possible to leave a trace of opening, and "x" indicates that it was difficult to open the packaging bag, or the seal itself could not be opened, or at the time of opening. It indicates that stringing has occurred and the appearance has deteriorated.

As shown in Table 1, in the packaging bags according to Examples 1 to 4, the active ingredient contained in the contents is adsorbed on the packaging even after long-term storage in an environment of 40 ° C. and 75% RH. Was able to be suppressed. Further, the packaging bags according to Examples 1 to 4 could be easily opened, and it was possible to leave a trace of opening.

On the other hand, although the packages according to Comparative Examples 1 and 3 showed low adsorptivity to the active ingredient contained in the contents, the laminated body was broken at the seal edge portion and could not be easily opened.
The packages according to Comparative Examples 2 and 4 could be easily opened and a trace of opening could be left, but the active ingredient contained in the contents was easily adsorbed.
Further, although the package according to Comparative Example 5 showed low adsorptivity to the active ingredient contained in the contents, the seal itself could not be formed.
Further, although the package according to Comparative Example 6 showed low adsorption to the active ingredient contained in the contents, stringing occurred when the bag was opened, resulting in poor appearance.

1 ... Laminated body, 1a ... Laminated body, 11 ... Base material layer, 12 ... Adhesive layer, 12a ... Adhesive layer, 12b ... Adhesive layer, 13 ... Sealant layer, 14 ... Barrier layer

Claims (7)

A laminate including at least a base material layer, an adhesive layer, and a sealant layer.
The sealant layer is composed of a cyclic polyolefin resin and a polybutene resin.
The ratio of the cyclic polyolefin resin in the sealant layer is 60% by mass to 95% by mass, and the ratio of the polybutene resin in the sealant layer is 5% by mass to 40% by mass.
A laminated body characterized by that. The glass transition temperature of the cyclic polyolefin resin is 60 ° C. to 100 ° C.
The melting point of the polybutene resin is 100 ° C. or higher.
The laminate according to claim 1, wherein the laminate is characterized by the above. The laminate according to claim 1 or 2, wherein a barrier layer is further provided between the base material layer and the adhesive layer. The laminate according to any one of claims 1 to 3, wherein the barrier layer includes a metal foil layer or a layer containing a thin film of metal or metal oxide. In the laminate according to any one of claims 1 to 4,
A method for producing a laminate, wherein the sealant layer is formed by any of an extrusion lamination method, a casting method, and an inflation method. A package obtained by using the laminate according to any one of claims 1 to 4. A packaged article including the package according to claim 6 and the contents contained therein.