JP2022049773A - Easy-tearable hygroscopic laminate for medicine or food package - Google Patents

Abstract

To provide an easily tearable hygroscopic laminate for medicine or food product package material, a packaging material and a package which suppress deterioration due to moisture absorption of a content and is excellent in hand tearability.SOLUTION: An easily tearable hygroscopic laminate comprises at least a gas barrier substrate layer 3 and a hygroscopic sealant layer 7 containing a hygroscopic agent, the hygroscopic agent contains a metal oxide, and the hygroscopic sealant layer is obtained by laminating a first heat seal layer 7a, a hygroscopic layer 7b and a second heat seal layer 7d in this order, the first heat seal layer is a layer containing low density polyethylene and is laminated on a side of the gas barrier substrate layer, the hygroscopic layer is a layer containing the hygroscopic agent and low density polyethylene, the low density polyethylene contained in the first heat sealing layer and the low density polyethylene contained in the hygroscopic layer are identical or different, and the second heat seal layer is a layer containing C4-linear low density polyethylene.SELECTED DRAWING: Figure 1

Description

The present invention has been produced by using an easy-to-cut moisture-absorbing laminate for pharmaceuticals or food packaging materials, which has excellent hand-cutting property, and the easy-to-cut moisture-absorbing laminate for suppressing deterioration of the contents due to moisture absorption. Easy-to-cut moisture-absorbing packaging materials for pharmaceuticals or foods, especially easy-to-cut moisture-absorbing packaging materials for pharmaceutical packaging and easy-to-cut moisture-absorbing packaging materials for pharmaceutical packaging exterior packaging, and easy-to-cut openable pharmaceutical packaging by them. In particular, the present invention relates to an easy-to-cut openable pharmaceutical package package, an easy-to-cut openable pharmaceutical package outer package, and an easy-to-cut openable stick-type food package.

In recent years, long-term storage of pharmaceuticals and foods has been desired in preparation for disasters and the like. However, the packaged pharmaceuticals and foods are liable to deteriorate due to moisture absorption, and sufficient long-term storage properties cannot be achieved.
Further, when using a drug or food, it is desirable that the package can be easily opened by hand (easy to open by hand).
In recent years, in order to reduce the burden on the environment, it has been studied to replace a part of the polyethylene-based resin of the sealant layer from the fossil fuel-derived polyethylene with the plant-derived polyethylene (Patent Document 1). As the blending ratio of the plant-derived polyethylene increases, the hand-cut openability of the resin film containing the above decreases, so that it is difficult to achieve both long-term storage and hand-cut openability.
Therefore, there is a demand for a packaging material that suppresses moisture absorption into the contents and has both long-term storage and hand-opening properties.

Japanese Unexamined Patent Publication No. 2009-155516

The present invention has been produced by using an easy-to-cut moisture-absorbing laminate for pharmaceuticals or food packaging materials, which suppresses deterioration of the contents due to moisture absorption and has excellent hand-cutting property, and the easy-to-cut moisture-absorbing laminate. Easy-to-cut moisture-absorbing packaging materials for pharmaceuticals or foods, especially easy-to-cut moisture-absorbing packaging materials for pharmaceutical packaging and easy-to-cut moisture-absorbing packaging materials for pharmaceutical packaging exterior packaging, and easy-to-cut openable pharmaceutical packaging by them. In particular, it is an object of the present invention to provide an easy-to-cut openable pharmaceutical package package, an easy-to-cut openable pharmaceutical package outer package, and an easy-to-cut openable stick-type food package.

As a result of various studies, the present inventors have at least a gas barrier base material layer and a moisture-absorbing sealant layer, and the moisture-absorbing sealant layer is a first heat-sealing layer, a moisture-absorbing layer, and a second heat-sealing layer. And are laminated in this order, the hygroscopic layer contains a specific hygroscopic agent, the first heat seal layer and the second heat seal layer have the same TD direction, and each has a specific polyethylene resin. It has been found that the easy-to-cut hygroscopic laminate for the contained pharmaceutical or food packaging material achieves the above-mentioned object.
That is, the present invention is characterized by the following points.
1. 1. An easy-to-cut moisture-absorbing laminate for pharmaceuticals or food packaging materials,
The easy-to-cut moisture-absorbing laminate has at least a gas barrier base material layer and a moisture-absorbing sealant layer containing a moisture-absorbing agent.
The hygroscopic agent contains a metal oxide and
The content of the hygroscopic agent in the layer containing the hygroscopic agent is 10% by mass or more and 60% by mass or less.
The moisture-absorbing sealant layer has a first heat-sealing layer, a moisture-absorbing layer, and a second heat-sealing layer laminated in this order.
The first heat-seal layer is a layer containing low-density polyethylene, which is laminated on the gas barrier base material layer side.
The hygroscopic layer is a layer containing the hygroscopic agent and low-density polyethylene.
The low-density polyethylene contained in the first heat-sealing layer and the low-density polyethylene contained in the moisture-absorbing layer are the same or different.
The second heat-sealing layer is a layer containing C4-linear low-density polyethylene, and is the outermost layer of the easy-to-cut moisture-absorbing laminate.
2. 2. The easy-to-cut moisture-absorbing laminate according to 1 above, wherein the metal oxide is one or more selected from the group consisting of calcium oxide, magnesium oxide, and hydrophilic zeolite.
3. 3. The easily cutable moisture-absorbing laminate according to 1 or 2 above, wherein the drug or food is a powder or a tablet.
4. The gas barrier base material layer has a base material layer and a gas barrier layer.
The base material layer is a layer made of a polyester film.
The easy-to-cut moisture-absorbing laminate according to any one of 1 to 7, wherein the gas barrier layer is a layer containing a metal or a metal oxide.
5. The easily cutable moisture-absorbing laminate according to any one of 1 to 4, wherein the moisture-absorbing sealant layer is a layer made of a moisture-absorbing sealant film.
6.23 ° C. 50% RH The easy-to-cut moisture-absorbing laminate according to any one of 1 to 5, wherein the moisture absorption amount for 14 days is 1 g / m ² or more and 8 g / m ² or less.
7. 1. Easy-to-cut moisture-absorbing laminate.
8. An easy-to-cut moisture-absorbing packaging material for pharmaceutical packaging, which is produced by using the easy-to-cut moisture-absorbing laminate according to any one of 1 to 7 above.
9. An easy-to-cut moisture-absorbing packaging material for pharmaceutical packaging, which is produced by using the easy-to-cut moisture-absorbing laminate according to any one of 1 to 7 above.
10. An easy-to-cut moisture-absorbing packaging material for the exterior packaging of pharmaceutical products, which is produced by using the easy-to-cut moisture-absorbing laminate according to any one of 1 to 7 above.
11. An easy-to-cut moisture-absorbing packaging material for food packaging, which is produced by using the easy-to-cut moisture-absorbing laminate according to any one of 1 to 7 above.
12. An easy-to-cut openable pharmaceutical package packaged with the easy-to-cut moisture-absorbing packaging material according to 8 above.
13. An easy-to-cut openable pharmaceutical package package packaged with the easy-to-cut moisture-absorbing packaging material according to 9 above.
14. An easy-to-cut openable pharmaceutical package exterior package packaged with the easy-to-cut moisture-absorbing packaging material according to the above 10.
15. An easy-to-cut openable stick-type food package packaged with the easy-to-cut moisture-absorbing packaging material according to 11 above.

INDUSTRIAL APPLICABILITY According to the present invention, an easily cutable moisture-absorbing laminate for pharmaceuticals or food packaging materials, which suppresses deterioration of the contents due to moisture absorption and has excellent hand-cutting property, and the easily-cutting moisture-absorbing laminate are produced. Easy-to-cut moisture-absorbing packaging materials for pharmaceuticals or foods, especially easy-to-cut moisture-absorbing packaging materials for pharmaceutical packaging and easy-to-cut moisture-absorbing packaging materials for pharmaceutical packaging exterior packaging, and easy-to-cut openable pharmaceutical packaging by them. In particular, it is possible to obtain an easy-to-cut openable pharmaceutical package, an easy-to-cut openable pharmaceutical package outer package, and an easy-to-open stick-type food package.

It is a schematic sectional drawing which shows an example of the layer structure of the easy-to-cut moisture-absorbing laminate or the easy-to-cut moisture-absorbing packaging material of this invention. It is a schematic cross-sectional view which shows an example of the easy-to-cut openable pharmaceutical package package of this invention. It is a schematic cross-sectional view which shows an example of the easy-to-cut openable pharmaceutical package packaging bag of this invention. It is a schematic cross-sectional view which shows an example of the easy-to-cut openable pharmaceutical package exterior package of this invention. It is a schematic cross-sectional view which shows an example of the easy-to-cut openable pharmaceutical package outer packaging bag of this invention. It is the schematic sectional drawing which shows an example of the easy-to-cut openable stick type food packaging bag of this invention.

In each figure, the size and ratio of the members may be changed or exaggerated for the sake of clarity. In addition, for the sake of readability, unnecessary parts for explanation and repeated codes may be omitted.
Further, although omitted in each figure, an adhesive layer may be provided between the layers.
Furthermore, if necessary, in order to strengthen the adhesive strength (adhesion strength) between the layers, the laminated surface of each layer is physically subjected to corona discharge treatment, ozone treatment, plasma treatment, glow discharge treatment, sandblast treatment, etc. It is also possible to perform a chemical surface treatment such as a specific surface treatment or an oxidation treatment using a chemical in advance.

The easy-to-cut moisture-absorbing laminate for pharmaceuticals or foods of the present invention, and various packaging materials and various packagings produced by using the easy-to-cut moisture-absorbing laminate will be described in more detail below. The present invention will be described with reference to specific examples, but the present invention is not limited thereto.
In the present invention, the film and the sheet are treated as synonymous.

≪Easy-to-cut moisture-absorbing laminate≫
The easy-to-cut moisture-absorbing laminate of the present invention is a laminate for pharmaceuticals or food packaging materials, and has a layer structure having at least a gas barrier base material layer and a moisture-absorbing sealant layer, and the package exhibits easy opening. The laminate itself has an easy-to-cut property so that it can be cut easily.
The gas barrier base material layer and the hygroscopic sealant layer may be directly laminated or may be laminated via an adhesive layer.
The hygroscopic sealant layer is excellent in hygroscopicity because it contains a hygroscopic agent, and is excellent in heat-sealing property because it contains a heat-sealing resin.

The hygroscopicity of the easy-to-cut moisture-absorbing laminate of the present invention is preferably 1 g / m ² or more and 8 g / m ² or less in an environment of 23 ° C. and 50% RH for 14 days. If the hygroscopicity is less than the above range, the hygroscopicity may be insufficient when a packaging material for pharmaceuticals or foods is produced, and it is difficult to obtain a hygroscopicity larger than the above range.

Easy-to-cut property The easy-to-cut property of the moisture-absorbing laminate of the present invention can be indicated by the tear strength, and each of the tear strengths in the MD direction and / or the TD direction according to the Elemendorff method based on JIS K7128-2 is 0. It is preferably .2N or more and 0.75N or less. If it is less than the above range, the package may be easily damaged, and if it is larger than the above range, the package may not be easily opened.

(Pharmaceuticals or foods to be packaged)
The pharmaceutical product or food product to be packaged in the easy-to-cut moisture-absorbing laminate of the present invention is preferably a powder or a tablet. Granules are also included in the powder.

<Gas barrier base material layer>
The gas barrier base material layer in the present invention is a base material layer having gas barrier properties, and may be composed of one layer such as a gas barrier resin film having gas barrier properties and properties as a base material, and may be a gas barrier. It may have a multi-layer structure including a layer and a base material layer.
Further, an adhesive layer may be provided between each layer constituting the gas barrier base base material layer or another layer in order to improve the adhesiveness, or the surface of each layer may be desired in advance as necessary. A surface treatment layer can be provided.

For example, corona treatment layer, ozone treatment by arbitrarily performing pretreatment such as corona discharge treatment, ozone treatment, low temperature plasma treatment using oxygen gas or nitrogen gas, glow discharge treatment, oxidation treatment using chemicals, etc. A layer, a plasma treatment layer, an oxidation treatment layer and the like can be formed and provided.

Alternatively, various coating agent layers such as a primer coating agent layer, an undercoating agent layer, an anchor coating agent layer, an adhesive layer, and a vapor-deposited anchor coating agent layer may be arbitrarily formed on the surface of each layer to form a surface treatment layer. You can also.

The above-mentioned various coating agent layers include, for example, polyester-based resin, polyamide-based resin, polyurethane-based resin, epoxy-based resin, phenol-based resin, (meth) acrylic-based resin, polyvinyl acetate-based resin, and polyolefins such as polyethylene or polypropylene. A resin composition containing a based resin, a copolymer thereof, a modified resin, a cellulose-based resin, or the like as the main component of the vehicle can be used.
The thickness of the gas barrier base material layer is preferably 10 μm or more and 100 μm or less, and more preferably 20 μm or more and 75 μm or less. If it is less than the above range, the rigidity and / or the gas barrier property may be insufficient, and if it exceeds the above range, the rigidity may become too strong and the workability may be deteriorated.

[Base layer]
As the base material layer, a publicly known resin film, paper material, or the like can be used, and the base material layer may be composed of one layer or may have a multi-layer structure including two or more layers having the same or different composition.

The thickness of the base material layer depends on the material, but in the case of a resin film, it is preferably 5 μm or more and 50 μm or less, more preferably 10 μm or more and 30 μm or less.
As the resin film used for the base material layer, a film made of a thermoplastic resin can be used, which has excellent chemical or physical strength and can withstand the conditions for forming a vapor-deposited film of a metal or a metal oxide. It is preferable that the thermoplastic resin can be held well without impairing the characteristics of the vapor-deposited film.

Examples of such resins include polyolefin resins such as polyethylene resins or polypropylene resins, cyclic polyolefin resins, polystyrene resins, acrylonitrile-styrene copolymers (AS resins), and acrylonitrile-butadiene-styrene copolymers. (ABS resin), poly (meth) acrylic resin, polycarbonate resin, polyethylene terephthalate, polyester resin such as polyethylene naphthalate, polyamide resin such as various nylons, polyurethane resin, acetal resin, cellulose resin, etc. Various resins can be mentioned.
In the present invention, as the resin, polyester-based resin, polyamide-based resin, and polyolefin-based resin are preferable, and polyethylene terephthalate (PET), nylon, and polypropylene (PP) are particularly preferable.

In the present invention, the thermoplastic resin used for the base material layer can be formed into a film by various publicly known and publicly used film forming methods.
For example, a method of forming a film using one kind of resin and a film forming method such as an extrusion method, a cast molding method, a T-die method, a cutting method, and an inflation method, using two or more kinds of resins. Examples thereof include a method of forming a multi-layer co-extruded film, a method of mixing two or more kinds of resins before forming a film, and a method of forming a film by the above-mentioned film forming method. Further, a film stretched in a uniaxial or biaxial direction can be obtained by using a tenter method, a tubular method, or the like.

Alternatively, one type or two or more types of resin may be applied, dried and coated on another resin film, or a resin melted by a T-die method or the like may be laminated.
In the present invention, as the resin film, a polyester film is preferable, and a biaxially stretched PET film, a biaxially stretched nylon film, a biaxially stretched PP film or a sheet is more preferably used.

In addition, when the resin film is formed into a film, for example, the film's processability, heat resistance, weather resistance, mechanical properties, dimensional stability, antioxidant property, slipperiness, releasability, flame retardancy, and resistance Various plastic compounding agents, additives, etc. can be added for the purpose of improving and modifying mold properties, electrical properties, strength, etc., and the amount of addition thereof is from a very small amount to several tens of percent. It can be arbitrarily added depending on the above.
In the above, as general additives, for example, lubricants, cross-linking agents, antioxidants, ultraviolet absorbers, light stabilizers, fillers, reinforcing agents, antistatic agents, pigments, reforming resins and the like are used. be able to.

[Gas barrier layer]
The gas barrier layer suppresses atmospheric gas from permeating through the easy-to-cut moisture-absorbing laminate from the outside to the inside of the package manufactured by using the easy-to-cut moisture-absorbing laminate of the present invention. It is a layer to do.
The gas barrier layer is a layer containing a metal, a metal oxide or a gas barrier resin, and specifically, the gas barrier layer includes a gas barrier resin film, a metal foil, a resin film with a metal or genus oxide vapor deposition layer, and a gas barrier property. One kind or two or more kinds selected from the group consisting of a resin coating film can be used.

As the gas barrier resin film, a publicly known and publicly available resin film having a gas barrier property can be used. For example, as the gas barrier film, specifically, a resin film made of a resin such as PET, polybutylene terephthalate, polyethylene naphthalate, polyamide, polyimide, polyvinyl alcohol, or an ethylene / vinyl alcohol copolymer is preferable.

As the metal foil, an aluminum foil having a thickness of 3 μm or more and 15 μm or less is preferable.

As the resin film with a metal or genus oxide vapor-deposited layer, a resin film in which an aluminum vapor-deposited film, a silica vapor-deposited film, and an aluminum oxide vapor-deposited film are formed on at least one surface of the above-mentioned base material resin film is preferable. As a commercially available resin film with an aluminum oxide thin-film film, for example, an alumina-deposited IB-PET-PIR (thickness) manufactured by Dainippon Printing Co., Ltd., which is a PET film in which alumina is vapor-deposited on one side by the PVD method. 12 μm), silica-deposited IB-ON-UB (thickness 15 μm), and the like.

As the gas barrier resin coating film, a coating film containing a sol-gel process hydrolyzed polycondensate formed from a metal alkoxide and a water-soluble polymer is preferable.

The metal leaf for the gas barrier layer, the resin film with the metal or metal oxide thin-film deposition layer can be adhered to other layers by using a dry laminate adhesive.
Alternatively, by using the resin film for the base material layer as the resin film of the resin film with the metal or metal oxide vapor-deposited layer, the lamination to the base material layer can be omitted.

<Hygroscopic sealant layer>
The moisture-absorbing sealant layer preferably has a layer structure in which a first heat-sealing layer, a moisture-absorbing layer, and a second heat-sealing layer are laminated in at least this order, and the first heat-sealing layer is on the gas barrier substrate layer side. In addition, it is preferable that the second heat seal layer is the outermost layer of the easily cutable moisture-absorbing laminate.
The moisture-absorbing sealant layer is strongly adhered to the gas barrier layer by the first heat-sealing layer, the easy-to-cut moisture-absorbing laminate of the present invention is imparted with heat-sealing by the second heat-sealing layer, and the easy-to-use layer of the present invention is provided by the moisture-absorbing layer. It is possible to impart hygroscopicity to the cuttable hygroscopic laminate.

Each of the first heat-sealing layer, the moisture-absorbing layer and the second heat-sealing layer may have a single-layer structure consisting of one layer or a multi-layer structure consisting of two or more layers. Further, the moisture-absorbing sealant layer may further have a layer other than the first heat-sealing layer, the moisture-absorbing layer, and the second heat-sealing layer, if necessary.

The content of the hygroscopic agent is preferably 10% by mass or more and 60% by mass or less, more preferably 30% by mass or more and 50% by mass or less in the layer containing the hygroscopic agent. If it is less than the above range, the hygroscopic effect may be insufficient, and if it is more than the above range, the film forming property may be deteriorated.
Here, the layer containing a hygroscopic agent refers to, for example, a hygroscopic layer, but if there is another layer containing a hygroscopic agent, that layer is also included.

Since the moisture-absorbing sealant layer is in contact with the space inside the package and exists at the bonding interface of the heat-sealed portion in the package, the thickness of the moisture-absorbing sealant layer can be adjusted to have heat-sealing property, moisture-absorbing property, and hand-cutting property. Can be adjusted.

The thickness of the moisture-absorbing sealant layer is preferably 20 μm or more and 150 μm or less, more preferably 30 μm or more and 100 μm or less, and 35 μm or more and 70 μm or less in order to have a good balance between heat-sealing property, hygroscopic property and hand-cutting property. Is more preferable. If it is thinner than the above range, the heat sealability and hygroscopicity may be insufficient, and if it is thicker than the above range, the hand-cutting property may be inferior.

The hygroscopic sealant layer can further contain a small amount of slip agent, antiblocking agent, antioxidant, solvent and other additives.

Further, the moisture-absorbing sealant layer is preferably a layer made of a moisture-absorbing sealant film.

(Heat-sealing resin)
The MFR (melt flow rate) of the heat-sealing resin is 1 g / 10 minutes or more, 10 g /
It is preferably 10 minutes or less, preferably 1.5 g / 10 minutes or more, and preferably 7 g / 10 minutes or less. As long as the MFR is within the above range, good MFR can be maintained even when mixed with other resins or hygroscopic agents, and good film-forming property and adhesiveness can be exhibited.

As the heat-sealing resin, a polyethylene-based resin is preferable.
Specific examples of the polyethylene-based resin include LDPE, medium-density polyethylene (hereinafter referred to as MDPE), high-density polyethylene (hereinafter referred to as HDPE), and linear (linear) low-density polyethylene (hereinafter referred to as HDPE). LLDPE), ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-methylmethacrylic acid copolymer, ethylene -Includes, but is not limited to, propylene copolymers and the like and mixtures of their resins.

Further, the LLDPE is preferably one or more selected from the group consisting of C4-LLDPE, C6-LLDPE and C8-LLDPE, and C6-LLDPE is more preferable.
Here, C4-LLDPE is a linear low-density polyethylene composed of a polymer of ethylene and 1-butene, and C6-LLDPE is composed of ethylene and 1-hexene and / or 4-methyl-1-pentene. LLDPE made of the copolymer of ethylene, and C8-LLDPE is LLDPE made of a copolymer of ethylene and 1-octene.
Each molecular structure has 4 and 6 carbon atoms derived from 1-butene, 1-hexene and / or 4-methyl-1-pentene and 1-octene in the main chain of LLDPE derived from ethylene, respectively. It has a molecular structure in which 8 or 8 side chains are present.

Among the above, one or more selected from the group consisting of MDPE, LDPE and LLDPE is preferable.
The heat-sealing resin is preferably contained in the first heat-sealing layer, the moisture-absorbing layer, and the second heat-sealing layer, but the heat-sealing resin contained in each may be the same or different. good.

[First heat seal layer]
As the heat-sealing resin contained in the first heat-sealing layer, low-density polyethylene (hereinafter referred to as LDPE) is preferable.
The thickness of the first heat seal layer is preferably 3 μm or more and 40 μm or less, more preferably 5 μm or more and 30 μm or less, and 8 μm or more and 15 μm or less in order to have a good balance between adhesiveness and hand-cutting property. More preferred. If it is thinner than the above range, the adhesiveness may be insufficient, and if it is thicker than the above range, the hand-cutting property may be inferior.

[Hygroscopic layer]
The hygroscopic layer is a layer containing a hygroscopic agent, has a high hygroscopicity, and preferably further contains a heat-sealing resin as a binder resin. However, other resins and various additives such as antioxidants can be contained within a range that does not significantly impair hygroscopicity and hand-cutting property.
The moisture-absorbing sealant layer may contain one layer or two or more layers having the same or different composition.
LDPE is preferable as the heat-sealing resin contained in the hygroscopic layer. The LDPE contained in the moisture absorbing layer and the LDPE contained in the first heat-sealing layer may be the same or different.

The thickness of the gas adsorption layer is preferably 5 μm or more and 55 μm or less, more preferably 10 μm or more and 45 μm or less, and further preferably 15 μm or more and 35 μm or less in order to show good hygroscopicity. If it is thinner than the above range, the gas adsorption property may be insufficient, and if it is thicker than the above range, the gas adsorption property is not improved so much, and the rigidity of the moisture absorbing sealant layer becomes too strong, which lowers workability. There is a risk.

[Second heat seal layer]
The second heat-sealing layer is a layer containing a heat-sealing resin and having a high heat-sealing property.
Since it has high heat-sealing properties, it is preferable that it does not contain a hygroscopic agent.
However, a hygroscopic agent, other resins, and various additives can be contained within a range that does not significantly impair the heat-sealing property and the hand-cutting property.
The second heat-sealing layer may contain one layer or two or more layers having the same or different composition in the moisture-absorbing sealant layer.
As the heat-sealing resin contained in the second heat-sealing layer, C4-linear low-density polyethylene (hereinafter referred to as LLDPE) is preferable.

The thickness of the second heat seal layer is preferably 3 μm or more and 40 μm or less, more preferably 5 μm or more and 30 μm or less, and further preferably 8 μm or more and 15 μm or less in order to show good heat sealability. If it is thinner than the above range, the heat sealability may be insufficient, and if it is thicker than the above range, the heat sealability is not improved so much, and the rigidity of the moisture-absorbing sealant layer becomes too weak to reduce workability. There is a risk.

Since the moisture-absorbing sealant layer in the present invention contains LLDPE in the second heat-sealing layer, it has a wider heat-sealing temperature range as compared with the case where it contains the same LDPE as the first heat-sealing layer. , Stable heat seal strength can be obtained.
Further, although the heat-sealing resin is oriented in the MD direction, the degree of orientation and the hand-cutting property in the TD direction and the MD direction differ depending on the type of resin. Since LLDPE has a stronger orientation in the MD direction than LDPE, the hand-cutting property in the TD direction tends to be relatively inferior. Is relatively good. Therefore, it is preferable to use C4-LLDPE for LLDPE.
The MD (Machine Direction) direction (flow direction) and the TD (Transverse Direction) direction (vertical direction) of the second heat seal layer are preferably the same as those of the first heat seal layer. By making it the same, the second heat seal layer contains C4-LLDPE, and by making the TD direction the same as the first heat seal layer, it contains the same LDPE as the first heat seal layer. Compared with the case, it is possible to obtain a balance between a wide heat seal temperature range, stable heat seal strength, and good hand-cutting property in both the TD direction and the MD direction.

[Heat absorbent]
The hygroscopic agent in the present invention preferably contains a metal oxide.
The metal oxide preferably contains one or more selected from the group consisting of calcium oxide, magnesium oxide, and hydrophilic zeolite.
The hygroscopic agent may have an arbitrary outer shape such as a spherical shape, a rod shape, or an elliptical shape, and may have any shape such as a powder shape, a lump shape, or a granular shape. From the viewpoint of properties, kneading properties, film forming properties, etc., powdery form is preferable.

In the present invention, the average particle size of the hygroscopic agent can be appropriately selected depending on the intended use, but the average particle size is preferably 0.01 μm or more and 15 μm or less, preferably 1 μm or more and 12 μm. The following are more preferable. Here, the average particle size is a value measured by a dynamic light scattering method.
When the average particle size is smaller than the above range, the hygroscopic agent tends to aggregate and the dispersibility tends to decrease. Further, when the average particle size is larger than the above range, the film-forming property of the layer containing the hygroscopic agent tends to be inferior, so that it tends to be difficult to add a large amount of the hygroscopic agent, and the surface area also decreases. , There is a possibility that a sufficient hygroscopic effect cannot be obtained.

(Hydrophilic zeolite)
The hydrophilic zeolite can be preferably used because the hygroscopic effect is maintained even when exposed to 230 ° C. or higher.
Since hydrophilic zeolite is hydrophilic, it easily adsorbs highly polar water molecules, etc., and conversely has low affinity with low-polarity organic gas, and other low-polarity gas components, hydrophobic gas, lipophilicity. It has low affinity with oil-based gases (including solvent-based gases) and is difficult to adsorb. That is, it is excellent in the function of not adsorbing a gas component having no functional group.

(Improved dispersibility by masterbatch of hygroscopic agent)
The hygroscopic agent may be directly mixed with other constituents of the moisture-absorbing sealant layer and melt-kneaded, but the hygroscopic agent is mixed with the thermoplastic resin at a high concentration and then melt-kneaded (melt-blended) to prepare a masterbatch. By the so-called masterbatch method, in which this is mixed with other constituents of the moisture-absorbing sealant layer at a ratio according to the target content and melt-kneaded, the dispersibility of the moisture-absorbing agent in the moisture-absorbing sealant layer is enhanced. Is preferable.
By adopting the masterbatch method, the hygroscopic agent can be efficiently and uniformly dispersed in the hygroscopic sealant layer even when a hygroscopic agent that easily causes aggregation is used.

The mass ratio of the hygroscopic agent / thermoplastic resin in the master batch is not particularly limited, but is preferably 20/80 or more and 60/40 or less, and more preferably 30/70 or more and 50/50 or less. ..
As a method of kneading the hygroscopic agent and the thermoplastic resin, a known or conventional kneading method can be applied.
The thermoplastic resin used for the master batch can be used in a type and content within a range that does not significantly adversely affect the heat sealability, film forming property, gas adsorption property, and low gas release property of the entire moisture-absorbing sealant layer. A resin having high compatibility with other resins such as a heat-sealing resin contained in the moisture-absorbing sealant layer and having the same degree of heat-sealing property is preferable, and may be the same as or different from these.

Specific examples of the thermoplastic resin used in the master batch include general-purpose polyethylene, polypropylene, methylpentene polymer, polyolefin resins such as acid-modified polyolefin resins, and mixtures of these resins. The type of thermoplastic resin is not limited to the resin, and the type of thermoplastic resin can be selected according to the purpose.

The MFR (melt flow rate) of the thermoplastic resin used in the masterbatch is preferably 0.2 g / 10 minutes or more and 10 g / 10 minutes or less. If the MFR is in this range, melt kneading with the hygroscopic agent is easy, the hygroscopic agent is easily dispersed in the hygroscopic sealant layer, and the film-forming property of the hygroscopic sealant layer is also easy to be maintained.

<Adhesive layer>
The easy-to-cut moisture-absorbing laminate for pharmaceutical packaging of the present invention may be laminated by providing an adhesive layer between the layers of each of the constituent layers and the layers within each layer.
Further, before forming the adhesive layer, an anchor coat layer may be formed in advance on the surface of the layer to be bonded in order to improve the adhesiveness.

The adhesive (adhesive composition) forming the adhesive layer may be a thermosetting type, an ultraviolet curable type, an electron beam curable type, or the like, and may be in any form such as an aqueous type, a solution type, an emulsion type, and a dispersed type. However, the properties may be any of film / sheet, powder, solid and the like, and the adhesive mechanism may be a chemical reaction type, a solvent volatilization type, a thermosetting type, a thermosetting type or the like. Any form may be used.

Examples of such an adhesive include a polyvinyl acetate adhesive such as polyvinyl acetate and a vinyl acetate-ethylene copolymer, and a polyacrylic composed of a copolymer of polyacrylic acid and polystyrene, polyester, polyvinyl acetate and the like. Acid-based adhesives, cyanoacrylate-based adhesives, ethylene copolymer-based adhesives consisting of copolymers of ethylene and monomers such as vinyl acetate, ethyl acrylate, acrylic acid, and methacrylic acid, cellulose-based adhesives, and polyurethane-based adhesives. Agents, polyester adhesives, polyamide adhesives, polyimide adhesives, polyolefin adhesives, amino resin adhesives consisting of urea resin or melamine resin, phenol resin adhesives, epoxy adhesives, reactive type ( Meta) Examples thereof include an elastomer adhesive made of acrylic adhesive, chloroprene rubber, nitrile rubber, styrene-butadiene rubber, etc., a silicone adhesive, an alkali metal silicate, an inorganic adhesive made of low melting point glass, and the like.
Among the above, a polyolefin-based adhesive is preferable when forming a laminate by coextrusion and film formation by an inflation method.

In one aspect of the present invention, the adhesive layer may be any of an EC (extrusion coat) adhesive, a dry laminating adhesive, a non-solvent laminating adhesive, and the like.
When an EC adhesive is used, it is not particularly limited, but for example, first, the adhesive is heated and melted, expanded and expanded in the required width direction with a T-die or the like, extruded into a curtain shape, and then flows onto the layer to be bonded. By sandwiching the adhesive layer between the rubber roll and the cooled metal roll, the adhesive layer is formed, and the adhesive layer is adhered to and laminated at the same time.

In another embodiment, the adhesive layer may be formed by sand lamination. In this case, the adhesive layer can be melted by heating and any resin applicable to the extruder can be used. Specifically, the resin listed as the above-mentioned thermoplastic resin having a heat-sealing property can be preferably used.

When using an adhesive for dry laminating, an adhesive dispersed or dissolved in a solvent is applied onto one film, dried, and the other film is laminated and then laminated at 30 to 120 ° C. for several hours to several hours. By aging for days, the adhesive can be cured, adhered and laminated.

When using an adhesive for non-solvent laminating, the adhesive itself is applied onto the layer to be adhered without being dispersed or dissolved in a solvent, dried, and the films forming the other layer are laminated and then laminated. The adhesive is cured and laminated by aging at ~ 120 ° C. for several hours to several days.

The dry laminating adhesive or the non-solvent laminating adhesive can be used by coating with, for example, a roll coat, a gravure roll coat, a kiss coat, etc., and the coating amount thereof is 0.1 to 10 g / m ² (dry state). Is desirable. By setting the coating amount in the above range, good adhesiveness can be obtained.

(Anchor coat layer)
The anchor coat layer can be formed from any anchor coat agent.
Examples of the anchor coating agent include organic titanium, isocyanate (urethane), polyethyleneimine, acid-modified polyethylene, polybutadiene, polyacrylic, polyester, epoxy, polyvinyl acetate, cellulose, and others. Anchor coating agents such as, etc. can be used.

[Method of manufacturing a hygroscopic laminate that can be easily cut]
The production method shown below is an example and does not limit the present invention.
The film formation and lamination of each layer constituting the easy-to-cut moisture-absorbing laminate is not particularly limited, and a known or conventional film-forming method or lamination method can be applied. For example, it can be carried out by any method such as a wet lamination method, a dry lamination method, a solvent-free dry lamination method, an extrusion lamination method, a T-die coextrusion molding method, a coextrusion lamination method, an inflation method, and the like.
The obtained easy-to-cut moisture-absorbing laminate has surface functions such as chemical function, electrical function, magnetic function, mechanical function, friction / wear / lubrication function, optical function, thermal function, and biocompatibility. It is also possible to perform secondary processing for the purpose of imparting such things as.

Examples of secondary processing include embossing, painting, adhesion, printing, metallizing (plating, etc.), machining, surface treatment (antistatic treatment, corona discharge treatment, plasma treatment, photochromism treatment, physical vapor deposition, chemical vapor deposition, etc.) Coating, etc.) and the like.

Below, for example, a layer structure of a gas barrier base material layer [base material layer / adhesive layer / gas barrier layer] / adhesive layer / moisture-absorbing sealant layer [first heat-sealing layer / moisture-absorbing layer / second heat-sealing layer]. An example will be described with respect to the case of producing an easy-to-cut moisture-absorbing laminate (easy-to-cut moisture-absorbing packaging material) having the above.

(Making a hygroscopic sealant film)
A resin composition for an adhesive reinforcing layer, a resin composition for a moisture absorbing layer, and a resin composition for a heat seal layer are prepared and prepared, respectively, and a moisture absorbing sealant film having the following layer structure is obtained by an inflation method. ..
Layer structure: 1st heat seal layer / moisture absorption layer / 2nd heat seal layer

(Preparation of easy-to-cut moisture-absorbing laminate)
Next, the moisture-absorbing sealant film obtained above for the moisture-absorbing sealant layer, the substrate film for the substrate layer, and the aluminum foil for the gas barrier layer were passed through the DL adhesive for the adhesive layer in this order. By laminating by dry lamination (coating amount: 3.5 g / m ² , drying temperature: 70 ° C.), an easily cutable moisture-absorbing laminate having the above layer structure is obtained.

(Method of forming and laminating a sealant layer of another aspect)
The moisture-absorbing sealant layer may be extruded or co-extruded and laminated on another layer such as a gas barrier base material layer by an extrusion coating method. Even in the case of the extrusion coating method, the layers may be laminated via an adhesive layer, if necessary.

≪Easy-to-cut moisture-absorbing packaging material≫
The easy-to-cut moisture-absorbing packaging material of the present invention is a packaging material for pharmaceuticals or food packaging made from the easy-to-cut moisture-absorbing laminate for the pharmaceutical or food packaging of the present invention, and is the same as the easy-to-cut moisture-absorbing laminate. It may have a layer structure, and may further include various functional layers, a printing layer, and the like, if necessary.
Further, the easy-to-cut moisture-absorbing packaging material of the present invention may be subjected to laminating processing (dry laminating or extruded laminating), bag making processing, and other post-treatment processing.
Specific examples of the easy-to-cut moisture-absorbing packaging material of the present invention include an easy-to-cut moisture-absorbing packaging material for pharmaceutical packaging and an easy-to-cut moisture-absorbing packaging material for the outer packaging of pharmaceutical packaging.

[Easy-to-cut moisture-absorbing packaging material for packaging pharmaceutical products]
The easy-to-cut moisture-absorbing packaging material for pharmaceutical packaging of the present invention is a packaging material for packaging pharmaceuticals in small portions using the easy-to-cut moisture-absorbing laminate for pharmaceutical packaging of the present invention.

[Easy-to-cut moisture-absorbing packaging material for exterior packaging of pharmaceutical products]
The easy-to-cut moisture-absorbing packaging material for packaged pharmaceutical products of the present invention is used to collectively package and store packaged pharmaceuticals using the easy-to-cut moisture-absorbing laminate for packaging pharmaceutical products of the present invention. Packaging material.

≪Easy-to-cut openable pharmaceutical packaging ≫
The easy-to-cut openable pharmaceutical package of the present invention is a package manufactured by using the easy-to-cut moisture-absorbing packaging material for the pharmaceutical product of the present invention, and specific examples thereof include an easy-to-cut openable pharmaceutical package. Examples include an easy-to-cut openable pharmaceutical package, an outer package, and an outer package.
The easy-to-cut openable pharmaceutical package of the present invention has excellent easy-to-cut openability because it is manufactured using the easy-to-cut moisture-absorbing packaging material of the present invention, which has excellent easy-to-cut properties.

For the easy-to-cut openable pharmaceutical package of the present invention, for example, the easy-to-cut moisture-absorbing packaging material for the pharmaceutical of the present invention is used, which is folded in half, or two easy-to-cut moisture-absorbing packaging materials are prepared. , The surfaces of the moisture-absorbing sealant layer are overlapped with each other facing each other, and the peripheral ends thereof are, for example, a side seal type, a two-way seal type, a three-way seal type, a four-way seal type, an envelope sticker seal type, and a gassho sticker type (gassho sticker type). Various forms of easy-to-cut openable pharmaceutical packages can be manufactured by heat-sealing with heat-sealing forms such as pillow-seal type), fold-seal-seal type, flat-bottomed-seal type, square-bottomed-seal type, and gusset type.
In the above, as the heat sealing method, for example, a known method such as a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, and an ultrasonic seal can be used.

[Easy-to-cut openable pharmaceutical packaging]
The easy-to-cut openable drug package of the present invention is a package in which a drug is packaged in small portions using the easy-to-cut moisture-absorbing packaging material for the drug package of the present invention.
In a narrow sense, an easily-cut openable drug package package that has been cut and individualized is also referred to as an easy-to-cut open drug package package.

[Easy-to-cut openable pharmaceutical packaging exterior packaging]
The easy-to-cut openable pharmaceutical package outer packaging of the present invention is a package in which pharmaceutical products are packaged in small portions using the easy-to-cut moisture-absorbing packaging material for the pharmaceutical package exterior packaging of the present invention. ..
In a narrow sense, an easy-to-cut openable pharmaceutical package outer packaging body that has been cut and individualized is also referred to as an easy-to-cut openable pharmaceutical package outer packaging bag.

[Easy-to-cut openable stick-type food packaging]
The easy-to-cut openable stick-type food package of the present invention is a stick-shaped package in which food is packaged using the easy-to-cut moisture-absorbing packaging material for food of the present invention.
In a narrow sense, a stick-type easy-to-cut openable food package that has been cut and individualized is also referred to as an easy-to-cut openable stick-type food packaging bag.

The details of the raw materials used in the examples are as follows.
[Base layer]
-PET film 1: E5100 manufactured by Toyobo Co., Ltd. 12 μm thick.
[Adhesive layer]
-DL Adhesive 1: Adlock RU77T / H7 manufactured by Rock Paint Co., Ltd. Polyester adhesive ・ [Gas barrier layer]
Aluminum foil 1: Made by Toyo Aluminum Co., Ltd. 7 μm thick.

[Heat absorbent]
-Metal oxide 1: Calcium oxide F lime 1300-K manufactured by Calfine Co., Ltd. Average particle size 4.3 μm.
-Metal oxide 2: Magnesium oxide Kyowamag 30 manufactured by Kyowa Chemical Industry Co., Ltd. Average particle size 3.16 μm.
-Metal oxide 3: Hydrophilic zeolite manufactured by Tomoe Kogyo Co., Ltd., 4A. Average particle size 10 μm.

[Heat-sealing resin]
-LDPE1: LDPE manufactured by Japan Polyethylene Corporation, Novatec LC520. Density 0.923 g / cm ³ , MFR 3.6 g / 10 minutes.
-LDPE2: LDPE, F224N manufactured by Ube Maruzen Polyethylene Co., Ltd. Density 0.924 g / cm ³ , MFR 2.0 g / 10 minutes.
LLDPE1: LLDPE, UM-720FT manufactured by Ube Maruzen Polyethylene Co., Ltd. Density 0.918 g / cm ³ , MFR 4.0 g / 10 minutes. C4-LLDPE.

[Anti-blocking agent]
-AB agent 1: Sumitomo Chemical Co., Ltd. anti-blocking agent, Sumikasen E EMB-21. Density 0.960 g / cm ³ , MFR 4.0 g / 10 minutes.
AB agent 2: UMERIT-27308M, an antiblocking agent manufactured by Ube-Maruzen Polyethylene Co., Ltd. Density 0.970 g / cm ³ , MFR 4.0 g / 10 minutes.

[Preparation of masterbatch]
The masterbatch used for the gas adsorption layer was prepared as follows.

(Preparation of master batch 1)
LDPE1 and metal oxide 1 were melt-blended at the following ratios to obtain Masterbatch 1 (MB1).
LDPE1 40 parts by mass Metal oxide 1 60 parts by mass

[Adjustment of masterbatch 2-4]
According to the formulation shown in Table 1, each raw material was melt-blended in the same manner as in Masterbatch 1 to obtain Masterbatch 2-4 (MB2-4).

(Preparation of Heat Seal Layer Resin Composition 1)
The following raw materials were melt-blended at the following ratios to obtain a heat-sealed layer resin composition 1.
LDPE1 95 parts by mass AB agent 15 parts by mass

(Preparation of Heat Seal Layer Resin Composition 2)
The following raw materials were melt-blended at the following ratios to obtain a heat-sealed layer resin composition 2.
LLDPE1 93 parts by mass AB agent 1 5 parts by mass AB agent 2 2 parts by mass

[Example 1]
(Preparation of hygroscopic layer resin composition)
MB1 and LDPE1 were dry-blended at the following ratios to obtain a hygroscopic layer resin composition 1.
MB1 67 parts by mass LDPE2 33 parts by mass

(Making a hygroscopic sealant film)
Using the first heat-sealing layer resin composition, the moisture-absorbing layer resin composition 1, and the second heat-sealing layer resin composition obtained above, a film was formed and laminated by coextrusion film formation to form the following layer structure. A moisture-absorbing sealant film (60 μm thickness) was prepared.
Layer structure: 1st heat seal layer / moisture absorption layer / 2nd heat seal layer = 1st heat seal layer resin composition (10 μm thickness) / moisture absorption layer resin composition 1 (20 μm thickness) / 2nd heat seal Layer resin composition (10 μm thickness)

(Preparation of hygroscopic laminate)
Using the moisture-absorbing sealant film obtained above, PET film 1, DL adhesive 1, and aluminum foil 1, a hand-cutting moisture-absorbing laminate having the following layer structure was produced by a dry lamination method. Then, various evaluations were carried out.
Layer structure: Base material layer / adhesive layer / gas barrier layer / adhesive layer / moisture-absorbing sealant layer [first heat-sealing layer / moisture-absorbing layer / second heat-sealing layer] = PET film 1 (12 μm thickness) / DL adhesion Agent 1 (3.5 g / m ² ) / Aluminum foil 1 (7 μm thickness) / DL adhesive 1 (3.5 g / m ² ) / Moisture-absorbing sealant film [First heat seal layer (10 μm thickness) / Moisture-absorbing layer resin Composition (20 μm thickness) / Second heat seal layer (10 μm thickness)]

[Examples 2 to 7, Comparative Examples 1 to 3]
Using the materials shown in Table 2, a moisture-absorbing layer resin composition was prepared by operating in the same manner as in Example 1, a moisture-absorbing sealant film and an easily cutable moisture-absorbing laminate were prepared, and evaluated in the same manner.

<Evaluation method>
[Film formation]
The appearance of the moisture-absorbing sealant film was observed and sensually evaluated. The evaluation criteria are as follows.
○: Film formation is possible without wrinkles or bumps.
×: Many wrinkles and bumps occur, making film formation difficult.

[Heat sealability]
Easy-to-cut moisture-absorbing laminate is cut into 100 mm x 100 mm, the moisture-absorbing sealant layer surfaces are overlapped, and a heat-sealing tester (manufactured by Tester Sangyo Co., Ltd .: TP-701-A) is used to heat-seal a 10 mm x 100 mm area under the following conditions. Then, a test piece having a peeling strength in a state where the end portion was not heat-sealed and was not adhered and was divided into two parts was prepared.
Cut this test piece into strips with a width of 15 mm, attach each bifurcated end to a tensile tester, measure the peel strength (N / 15 mm) under the following conditions, and use the following pass / fail criteria. A pass / fail judgment was made.
Heat seal condition Temperature: 160 ℃
Pressure: 1kgf / cm ²
Time: 1 second Test conditions Test speed: 300 mm / min Load range: 50 N
Pass / Fail Criteria ○: 15N / 15mm or more, pass.
X: Less than 15N / 15mm and failed.

[Tear strength]
In accordance with the Elemendorff method (JIS K7128-2), the easy-to-cut moisture-absorbing laminate is cut into test pieces having a size of 75 mm x 63 mm, and the Elemendorff tear tester (manufactured by Tester Sangyo Co., Ltd., IM-701). ) Was used to measure the tear strength in the flow (MD) direction or the width (TD) direction, and the determination was made according to the following pass / fail criteria.
(Pass / Fail Judgment Criteria)
◯: Less than 0.75N and passed.
×: 0.75N or more and failed.

[Hand-cut openness]
Easy-to-cut moisture-absorbing laminate is cut into 50 mm x 50 mm, the moisture-absorbing sealant layer surfaces are overlapped, and a heat-seal tester (manufactured by Tester Sangyo Co., Ltd .: TP-701-A) is used to create a 5 mm wide region on the four sides. Was heat-sealed under the following conditions, and a notch portion having a length of 2 mm was formed at a position 10 mm from the corner portion on one side to prepare 10 pouch bags.
Heat seal condition Temperature: 160 ℃
Pressure: 1kgf / cm ²
Time: 1 second The 10 pouch bags prepared were opened by hand from the notch portion in the notch direction, and the catching at the start of opening and the elongation of the sealant layer were evaluated. Five people were sensually evaluated two by two, and the average was taken.
⊚: There was no catching or elongation of the sealant layer.
◯: There was slight catching or elongation of the sealant layer.
Δ: There was moderate catching or elongation of the sealant layer.
X: There was severe catching or elongation of the sealant layer.

[Hygroscopic amount]
The change in the weight of the 100 mm × 100 mm easy-to-cut moisture-absorbing laminate under the environment of 23 ° C. and 50% RH was measured, and the moisture absorption amount was calculated from the following formula.
Moisture absorption (g / m ² ) = [wet weight after 2 weeks (g) -initial dry weight (g)] /0.01 (m ² )

<Summary of results>
The easy-to-cut moisture-absorbing laminates of all the examples showed good film-forming property, heat-sealing property, tear strength, hand-cut opening property, and hygroscopic property.
However, Comparative Example 1 in which the content of the hygroscopic agent is not sufficient and Comparative Example 3 in which the hygroscopic agent is not contained show insufficient hygroscopicity, and Comparative Example 2 in which the content of the hygroscopic agent is too large is insufficient. It showed excellent film-forming and heat-sealing properties.

1 Easy-to-cut moisture-absorbing laminate 2 Easy-to-cut moisture-absorbing packaging material 3 Gas-barrier base material layer 4 Base material layer 5 Adhesive layer 6 Gas barrier layer 7 Moisture-absorbing sealant layer 7a First heat seal layer 7b Moisture-absorbing layer 7c Moisture-absorbing agent 7d Heat seal layer of 2 20 Separate packaging 21 Separate packaging bag 22 Contents 23 Heat seal part 24 Perforation 25 Cut edge 30 Separate outer packaging 31 Separate outer packaging bag 32 Contents (separate packaging bag)
33 Heat seal part 34 Back seal part 41 Easy-to-cut openable stick type food packaging bag 42 Contents 43 Heat seal part 44 Back seal part

Claims (15)

An easy-to-cut moisture-absorbing laminate for pharmaceuticals or food packaging materials,
The easy-to-cut moisture-absorbing laminate has at least a gas barrier base material layer and a moisture-absorbing sealant layer containing a moisture-absorbing agent.
The hygroscopic agent contains a metal oxide and
The content of the hygroscopic agent in the layer containing the hygroscopic agent is 10% by mass or more and 60% by mass or less.
The moisture-absorbing sealant layer has a first heat-sealing layer, a moisture-absorbing layer, and a second heat-sealing layer laminated in this order.
The first heat-seal layer is a layer containing low-density polyethylene, which is laminated on the gas barrier base material layer side.
The hygroscopic layer is a layer containing the hygroscopic agent and low-density polyethylene.
The low-density polyethylene contained in the first heat-sealing layer and the low-density polyethylene contained in the moisture-absorbing layer are the same or different.
The second heat-sealing layer is a layer containing C4-linear low-density polyethylene, and is the outermost layer of the easy-to-cut moisture-absorbing laminate. The easy-to-cut moisture-absorbing laminate according to claim 1, wherein the metal oxide is one or more selected from the group consisting of calcium oxide, magnesium oxide, and hydrophilic zeolite. The easy-to-cut moisture-absorbing laminate according to claim 1 or 2, wherein the drug or food is a powder or a tablet. The gas barrier base material layer has a base material layer and a gas barrier layer.
The base material layer is a layer made of a polyester film.
The easy-to-cut moisture-absorbing laminate according to any one of claims 1 to 7, wherein the gas barrier layer is a layer containing a metal or a metal oxide. The easy-to-cut moisture-absorbing laminate according to any one of claims 1 to 4, wherein the moisture-absorbing sealant layer is a layer made of a moisture-absorbing sealant film. The easy-to-cut moisture-absorbing laminate according to any one of claims 1 to 5, wherein the moisture absorption amount at 23 ° C. and 50% RH for 14 days is 1 g / m ² or more and 8 g / m ² or less. Any 1 of claims 1 to 6, wherein the tear strength in the MD direction and / or the TD direction according to the Elementdorf method according to JIS K7128-2 is 0.2 N or more and 0.75 N or less. The easy-to-cut moisture-absorbing laminate described in the section. An easy-to-cut moisture-absorbing packaging material for pharmaceutical packaging, which is produced by using the easy-to-cut moisture-absorbing laminate according to any one of claims 1 to 7. An easy-to-cut moisture-absorbing packaging material for pharmaceutical packaging, which is produced by using the easy-to-cut moisture-absorbing laminate according to any one of claims 1 to 7. An easy-to-cut moisture-absorbing packaging material for pharmaceutical packaging exterior packaging, which is produced by using the easily-cutting moisture-absorbing laminate according to any one of claims 1 to 7. An easy-to-cut moisture-absorbing packaging material for food packaging, which is produced by using the easy-to-cut moisture-absorbing laminate according to any one of claims 1 to 7. An easy-to-cut openable pharmaceutical package packaged with the easy-to-cut moisture-absorbing packaging material according to claim 8. An easy-to-cut openable pharmaceutical package package packaged with the easy-to-cut moisture-absorbing packaging material according to claim 9. An easy-to-cut openable pharmaceutical package exterior package packaged with the easy-to-cut moisture-absorbing packaging material according to claim 10. An easy-to-cut openable stick-type food package packaged with the easy-to-cut moisture-absorbing packaging material according to claim 11.

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