JP2002144508A - One side absorption type deoxidation multilayer laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To industrially manufacture a deoxidation film capable of being largely stretched without breakage, highly open cell-perforated in a deoxidation layer and having a fast deoxidation speed. SOLUTION: A multilayer laminate comprises at least three layers having a heat sealing layer (layer A) made of an oxygen permeable thermoplastic resin arranged on one side of a deoxidation layer (layer B) made of a thermoplastic resin composition blended with a deoxidation composition, and a barrier layer (layer C) made of a gas barrier material arranged at the other side of the layer B. In this case, 50 wt.% or more of the thermoplastic resin component of the layer B is made of any of a polypropylene, a linear low-density polyethylene, and a high-density polyethylene, and at least the layer B is open cell- perforated by stretching.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a film or sheet having a deoxidizing function. More specifically, a piece used to constitute a deoxidizing bag or a deoxidizing container with the purpose of preventing the oxidation of various products which are susceptible to deterioration by the influence of oxygen, such as food, medicine and metal products. The present invention relates to a deoxidized multilayer body having a side surface exhibiting oxygen absorption performance.

[0002]

2. Description of the Related Art Deoxidizers for removing oxygen have conventionally been used for the purpose of preventing oxidation of various products, such as foods, pharmaceuticals, and metal products, which are liable to deteriorate under the influence of oxygen. The form initially developed as the oxygen absorber and still in use today is one in which a granular or powdered oxygen-absorbing composition is packed in a small pouch. In order to improve this, a film or sheet in which a deoxidizing composition is fixed has been considered as a safe deoxygenating body which is easier to handle and has a wider application range and does not cause problems such as accidental eating.

[0003] In order to form a film or sheet, it is convenient to use a thermoplastic resin as a matrix component to form a composite with a granular or powdery deoxidizing composition. However, if the composite film or sheet is used as it is, there is a danger that the oxygen scavenger composition oozes out due to the contact between the oxygen absorber and the contents, especially the liquid, causing contamination of the contents. There is. Also, it is necessary to increase the oxygen transmission rate. As a countermeasure, if the oxygen-absorbing layer is made porous by stretching and its upper surface is protected by a non-porous layer, a oxygen-absorbing film or sheet having a high oxygen permeation rate and no exposure or elution of the oxygen absorber is provided. Can be produced as described in Japanese Patent Application Laid-Open No. 9-234811
And Japanese Patent Application Laid-Open No. 10-264279.

[0004] In such a deoxidizing film or sheet, the deoxidizing layer is continuously made porous in order to increase the deoxidizing rate. For continuous porosity, it is general to stretch the oxygen-absorbing layer containing the oxygen-absorbing agent alone or collectively with other laminated layers. However, as a result of the study by the present inventor, even if the thermoplastic resin alone is a resin having good stretchability, by the oxygen scavenger dispersed in the thermoplastic resin,
The drawback was that the stretchability was impaired, and the film or sheet was cut in the middle and could not be stretched at all, or even if it could be stretched, it was only stretched at a low magnification and could not be highly continuous and porous. Was done. When the heat seal layer is stretched together with the oxygen-absorbing layer, the heat seal layer also needs to have good stretchability, and if the heat seal layer and the oxygen-absorbing layer do not have good stretchability, sufficient performance is obtained. You can't get it. The problem to be solved by the present invention is:
An object of the present invention is to provide a single-sided absorption type oxygen-absorbing multilayer having a high oxygen-absorbing rate, in which the oxygen-absorbing layer is stretched without any problem and is highly continuous and porous.

[0005]

Means for Solving the Problems The present inventors have conducted intensive studies, and as a result, have found that 50 w
At least t% is composed of any of polypropylene, linear low density polyethylene and high density polyethylene,
And, by at least stretching the oxygen-absorbing layer, the film can be stretched largely without breaking, and the oxygen-absorbing layer is highly continuous and porous, the oxygen-absorbing rate is high, and the oxygen-absorbing film is industrially manufactured. They found what they could do and completed the invention.

That is, the one-side absorption type oxygen-absorbing film or sheet of the present invention has an oxygen-permeable oxygen-permeable layer (B layer) on one side of a oxygen-absorbing layer (layer B) made of a thermoplastic resin containing an oxygen-absorbing composition. Heat seal layer made of thermoplastic resin (A
Layer, and a barrier layer (layer C) made of a gas barrier material is disposed on the other side of the layer B. 50% by weight or more of the thermoplastic resin component of the layer B is composed of polypropylene, linear low- A one-sided absorption deoxidized multilayer body comprising at least one of high-density polyethylene and high-density polyethylene, wherein the layer B is continuously made porous by stretching.

In the case of stretching together with the layer A, the layer A is also characterized in that 50% by weight or more of the thermoplastic resin component is at least one of polypropylene, linear low density polyethylene and high density polyethylene. And Among these resins, in particular, when a single-site catalyst linear low-density polyethylene is used, not only good stretchability but also oxygen permeability and oxygen-absorbing sheet or film having excellent heat sealability can be obtained. it can. In a preferred aspect of the present invention, in the deoxidized multilayer body, 50% by weight or more of each of the thermoplastic resin components of the heat seal layer (A layer) and the deoxidized layer (B layer) is polypropylene, linear low density polyethylene, This is a single-sided absorption-type oxygen-absorbing multilayer body made of at least one kind of high-density polyethylene and having the layer A stretched together with the layer B.

Furthermore, it has been found that the extensibility can be improved by adding a small amount of a low-viscosity resin to the layer B. Another one-side absorption type oxygen-absorbing film or sheet of the present invention is the oxygen-absorbing multilayer body, wherein the thermoplastic resin component of the oxygen-absorbing layer (layer B) contains a low-viscosity resin component. It is.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION As a resin used for a deoxidizing layer (B layer), a deoxidizing composition such as iron powder can be easily mixed and dispersed, and it is necessary that the resin be made porous by stretching. . The present inventors have found polypropylene, high-density polyethylene and linear low-density polyethylene as such resins from a very wide variety of resins. That is, polypropylene, high-density polyethylene, or linear low-density polyethylene is used alone or as a mixture, and 50% by weight or more of the resin component of the oxygen-absorbing layer is blended. When two or more of polypropylene, high-density polyethylene, and linear low-density polyethylene are used, the total amount thereof is 50 wt% or more of the resin component of the deoxidized layer. In particular, when 50% by weight or more of the resin component of the oxygen-absorbing layer is a linear low-density polyethylene manufactured using a single-site catalyst, not only good stretchability but also oxygen-absorbing property and heat-sealing property are obtained. Is also preferable. The single-site catalyst is a catalyst having a uniform active point, and a linear low-density polyethylene using this catalyst is characterized by a narrow composition and a narrow molecular weight distribution. As such a single-site catalyst, a metallocene catalyst is most widely used, and other examples include a Brookhart complex catalyst and a phenoxyimine complex catalyst.

Further, the thermoplastic resin component used in the B layer is mixed with a thermoplastic resin resin having a lower viscosity than the thermoplastic resin mainly used in the B layer to reduce various properties such as strength. And the stretchability can be further improved. This low-viscosity thermoplastic resin has a melt flow rate (MF) that is at least twice that of the thermoplastic resin mainly used for the layer B.
R) is preferably a low-viscosity thermoplastic resin, and the thermoplastic resin mainly used for the B layer has an MFR of 0.1 to 5 g / 10
min, low viscosity thermoplastic resin has MFR of 5 to 30 g / 10
A combination of thermoplastic resins having the respective values of min is preferable.
The amount of the low-viscosity resin to be added is preferably 3 to 40% by weight based on the thermoplastic resin mainly used for the B layer, and 5 to 20% by weight.
wt% is most preferred. The type of the low-viscosity resin is not particularly limited, but preferably has good stretchability, and more preferably polypropylene, high-density polyethylene and linear low-density polyethylene. Since it is preferable that the thermoplastic resin mainly used for the layer B has compatibility, it is most preferable to use the same type of thermoplastic resin as the resin mainly used for the layer B.

As the oxygen-absorbing composition used for the oxygen-absorbing layer (layer B), known oxygen-absorbing compositions can be used. Among them, metal powders such as iron powder, aluminum powder and silicon powder, ferrous salts, etc. Of oxygen or phenols such as inorganic salts, ascorbic acid and salts thereof, catechol and glycerin are preferred. As the particle size of the oxygen-absorbing composition, the maximum particle size is preferably less than the thickness of the oxygen-absorbing layer, to increase the oxidation rate, and to prevent damage to other layers without causing penetration to other layers. Is preferably finer. The deoxidizing composition is selected from those having a maximum particle size of preferably 200 μm or less, more preferably 100 μm or less. The amount of the oxygen-absorbing composition in the layer B is 10 to 60 wt%.
And more preferably 30 to 55% by weight. Further, an inorganic filler may be added to the deoxygenation layer as a porosification aid.

The heat seal layer (layer A) is a layer which is located on the inner surface side of the container or bag and forms a deoxidizing container or bag together with other layers. In order to increase the oxygen absorption rate, the oxygen permeability coefficient should be 1 × 10 ^-13 [cm ³ · cm / cm ² · sec · P
a] above, and 1 × 10 ^-12 [cm ³ · cm / cm ² · sec · Pa]
The above-mentioned thermoplastic resin or thermoplastic resin composition is preferred.

The thermoplastic resin constituting the heat seal layer may be not only a polymer polymerized from a single monomer species, but also a mixture of various copolymers and resins, and a non-polar or low-polar polymer may be used. preferable. Further, as long as the oxygen permeability of the entire heat seal layer satisfies the above range, the heat seal layer itself may be composed of a plurality of thermoplastic resin layers.

Specific examples of the resin used for the heat sealing layer include ethylene, propylene, 1-butene,
Homopolymers and copolymers of olefins such as -methyl-1-pentene, ethylene-vinyl acetate copolymers, and polybutadienes, polyisoprenes, styrene-butadiene copolymers and hydrogenated products thereof, and various silicones. There are resins and the like, and modified products, grafts and mixtures thereof may also be used.

[0015] When the heat seal layer is co-stretched with the oxygen-absorbing layer, 50% by weight or more of the thermoplastic resin component constituting the heat seal layer is composed of polypropylene, straight-apart, similarly to the oxygen-absorbing layer. It is preferable to use at least one of chain low-density polyethylene and high-density polyethylene. When two or more of polypropylene, high-density polyethylene and linear low-density polyethylene are used, the total amount thereof is 50 w of the thermoplastic resin component of the deoxidized layer.
The amount used is at least t%. Among these resins,
In terms of heat sealability and oxygen permeability, linear low-density polyethylene produced using a single-site catalyst is particularly preferred.

Further, an inorganic filler such as titania or calcium carbonate or an incompatible resin to be described later is blended with the thermoplastic resin constituting the heat seal layer in order to conceal the deoxidized layer as long as the heat seal property is not impaired. And stretched. The surface of the heat seal layer is preferably flat from the viewpoint of heat seal strength, but the heat seal layer may be porous as long as the heat seal layer has no irregularities. Further, when the contamination of the contents by the composition of the deoxidizing layer does not pose a problem, it may be continuous porous. In addition, for the heat seal layer, it is preferable to use the same resin as the matrix component of the adjacent layer, and when different resins are used, they are compatible to the extent that they can be thermally fused. Thermoplastic resins are preferred.

The heat sealing layer may be stretched by adding an incompatible resin for the purpose of improving oxygen permeability. The incompatible resin is substantially incompatible with the thermoplastic resin constituting the heat seal layer even in a molten state, and forms voids in the heat seal layer during stretching to increase oxygen permeability. The incompatible resin is preferably a thermoplastic resin.

Specific examples of the incompatible resin include polyethylene, polypropylene, poly-1-butene, poly-
Polyolefins such as 4-methyl-1-pentene, polydienes such as polybutadiene and polyisoprene and hydrogenated products thereof, aromatic resins such as polystyrene, various silicone resins and fluororesins, polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalene; Polyester such as phthalate, 6 nylon, MXD6
Examples thereof include nylon such as nylon and 6,6 nylon, polycarbonate, polyphenylene ether, polyacetal, polyphenylene sulfide, liquid crystal polymer, polysulfone, polyethersulfone, polyetheretherketone, polyamideimide, and polyetherimide. Alternatively, a copolymer such as an ethylene-vinyl acetate copolymer, an ethylene-butene copolymer, a styrene-butadiene copolymer, or a resin composition of a combination of two or more such as ABS may be used. Good.

The thickness of the heat seal layer is determined by the required performance of the object to be deoxidized represented by the oxygen permeability and the oxygen permeability coefficient of the resin. However, if it is possible to manufacture stably so that pinholes and the like do not occur, and if it is certain that pinholes and tears do not occur even in contact with the contents in normal use, it is desirable that the thickness be as thin as possible.
Generally, the thickness is preferably about 5 to 200 μm.

The deoxidizing layer (B layer) and the heat sealing layer (A
A concealing layer made of a thermoplastic resin containing a filler can be provided between the layers. This concealing layer is a layer for concealing the deoxidized layer from the outside. Examples of the filler used in the concealing layer include inorganic fillers such as silica, alumina, diatomaceous earth, titania, and barium sulfate. Titanium is most preferably used in terms of concealing properties. Further, when the concealing layer is made porous by stretching in order to increase the oxygen permeability of the concealing layer, crushed silica, α-
It is preferable to use alumina as a porogen, and it is most preferable to use these together with titania. Further, since the concealing layer is located between the heat sealing layer and the deoxidizing layer, the particle diameter of the filler is preferably as small as possible so as not to penetrate through the heat sealing layer, and is usually 0.1 to 30 μm in primary particle diameter. It is.

A non-porous buffer layer can be provided between the deoxygenation layer (B layer) and the barrier layer (C layer). The buffer layer is provided in the case where the deoxygenation layer and the barrier layer are directly laminated, such a problem that only a layer having low interlayer strength can be obtained. As the material constituting the buffer layer, the same resin as the resin used for the matrix component of the deoxidizing layer or a resin compatible with the resin is used. Homopolymers and copolymers of olefins such as ethylene, propylene, 1-butene, 4-methyl-1-pentene, ethylene-vinyl acetate copolymer, polybutadiene, polyisoprene, styrene-butadiene copolymer and hydrogen thereof Additives and various silicone resins are exemplified. In addition, these metamorphosis,
It may be a graft, a mixture or the like.

The barrier layer (C layer) is made of a gas barrier material and has a function of preventing oxygen from entering from outside the container. By arranging the barrier layer on one side of the oxygen-absorbing layer (layer B), a single-sided absorption oxygen-absorbing multilayer is obtained. Barrier layer (C
Examples of the material constituting the layer) include polyesters such as polyethylene terephthalate, nylon 6, and nylon MX.
Polyamides such as D6; chlorine-containing resins such as polyvinyl chloride and polyvinylidene chloride; low oxygen-permeable resins such as ethylene-vinyl alcohol copolymer; coated products thereof; metal foils such as aluminum or metal-deposited resins;
There is a low oxygen permeable laminated film such as an inorganic compound vapor-deposited resin such as silicon oxide.

The material constituting each layer can maintain the deoxidizing rate of the deoxidizing film or sheet and prevent the dissolution of the deoxidizing composition, and if there is no problem such as new dissolution, the above-mentioned material is used. In addition, various substances can be added. Examples of the additives include pigments and dyes as colorants or hiding agents, stabilizing components as antioxidants and antidecomposition agents, antistatic components, moisture absorbing components, deodorizing components, plasticizing components, and flame retardants. And the like. Also,
Similarly, a layer such as a surface protective layer of a barrier layer, a printing layer, an easy-opening layer, and an easy-peeling layer can be added as long as the performance as a deoxidizing film or sheet is not adversely affected.

In the lamination of each layer constituting the present invention,
Known lamination methods such as ordinary coextrusion, extrusion coating, and extrusion lamination can be used. The continuous porous resin layer refers to a resin layer having a large number of voids and having continuous voids so that the voids communicate with each other to penetrate the resin layer. Although various methods can be adopted as the method, stretching the resin layer containing the deoxidizing composition and the resin layer containing the inorganic filler is also suitable from the viewpoint of productivity.

In the stretching, any of uniaxial stretching, biaxial simultaneous stretching, and biaxial sequential stretching may be used, as is generally known. Further, the deoxidizing layer or the concealing layer filled with the inorganic filler or both are stretched,
Later, other layers may be laminated by adhesion or fusion, vapor deposition, or the like, or a heat seal layer, [optionally a concealment layer],
Stretching may be performed after laminating a deoxygenation layer and [optionally a buffer layer]. Alternatively, in the case of a resinous barrier layer, it may be stretched after laminating a heat seal layer, [a concealing layer if desired], a deoxidizing layer, [a buffer layer if desired], and a barrier layer. In addition,
[...] indicates that a concealing layer made of a thermoplastic resin composition containing a coloring agent such as a pigment or a buffer layer made of a polyolefin resin may be interposed, if desired. The stretching ratio is preferably 2 to 20 times, with the stretching ratio being 1 time in the non-stretched state.

When a low oxygen permeability barrier layer is added later, the layer is bonded or fused by a usual method such as heat lamination, dry lamination, extrusion coating, etc. to form a final multilayer structure. Can be.

The oxygen-absorbing film and sheet of the present invention can be used as an oxygen-absorbing packaging material having gas barrier properties on one side and oxygen absorption on the other side. It is used in various forms for some or all of the packaging containers. For example, it can be used for a top seal film of a packaging container or a packaging bag. The content can be not only solid but also liquid or a mixture of solid and liquid.

[0028]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto. The common items in the description are as follows. The measurement of the deoxygenation rate is as follows: the oxygen-absorbing multilayer film or sheet and a predetermined amount of air, and a cotton wool impregnated with water for humidification such that the area of the oxygen-absorbing multilayer film or sheet is 1 cm ² per 1 ml of air, Put in an oxygen barrier bag containing aluminum layer and store at 25 ° C,
The change over time in the oxygen concentration in the air in the bag was measured by tracking it with a gas chromatograph (Shimadzu Corporation, GC-14B).
The deoxidation rate was shown as the time until the oxygen concentration reached 0.1 vol% (deoxidation time). The stretchability was measured by increasing the stretch ratio from 2 times to 0.5 times and stretching.
It was expressed as the magnification immediately before the film was broken (maximum stretching magnification). (Example: In case of breaking at a draw ratio of 5.5 times, it indicates 5.0 times)

Example 1 An oxygen-containing composition obtained by spraying an aqueous solution containing 2 parts by weight of calcium chloride with respect to 100 parts by weight of iron powder having a maximum particle size of about 50 μm, drying by heating and coating, and a polypropylene (Japanese) as a thermoplastic resin Polychem Co., Ltd., trade name FY4, MFR
5.0 g / 10 min, density 0.90 g / cm ³ ) and dry lime were kneaded with a 30 mm diameter twin screw extruder, extruded from a strand die, cooled, cut with a pelletizer, and then deoxygenated resin composition. Was obtained. The composition of the deoxidizing resin composition is 50% by weight of the deoxidizing composition, 48% by weight of the thermoplastic resin, and 2% by weight of quicklime.

Re-melt the pellets of the deoxidized composition to a thickness
Create a 250μm, 150mm wide oxygen-absorbing strip.
Made. As the heat seal layer, the same polyp as the oxygen scavenging layer
Lopylene and titania (trade name S, manufactured by Sakai Chemical Industry Co., Ltd.)
R-1, primary particle diameter 0.25 μm, density 4.1 g / cm
^Three) Is kneaded and extruded to a thickness of 80 μm to remove oxygen.
And stretched. The composition of the heat seal layer
It is 90% by weight of propylene and 10% by weight of titania. Heat sea
The maximum stretchable ratio of the laminate of the metal layer and the deoxidizing layer is 7 times
Met. The heat seal layer stretched at a stretch ratio of 3
Aluminum foil is applied to the laminate with the oxygen layer using a urethane-based adhesive
A-515, manufactured by Tadaku Yakuhin Co., Ltd.
50, mixing ratio 10: 1)
Obtained. The deoxidation time of this deoxidized multilayer film was measured.
However, it was 23 hours.

Example 2 The thermoplastic resin of the deoxidizing layer and the heat sealing layer was made of high-density polyethylene (trade name: HY540, manufactured by Nippon Polychem Co., Ltd.).
MFR 1.0g / 10min, density 0.96g / c
A deoxygenation layer and a heat seal layer were prepared in the same manner as in Example 1 except that the melting point was set to m ³ and the melting point was 135 ° C.). The maximum stretchable ratio of the laminate of the heat seal layer and the oxygen scavenging layer was 10 times. After stretching the laminate of the heat seal layer and the oxygen-absorbing layer at a stretching magnification of 3 times, the oxygen-absorbing time of the oxygen-absorbing multilayer film to which the aluminum foil is attached is 18
It was time.

Example 3 The thermoplastic resin of the deoxidizing layer and the heat sealing layer was changed to linear low-density polyethylene (trade name UF4, manufactured by Nippon Polychem Co., Ltd.).
20, MFR 0.8g / 10min, density 0.925g
/ Cm ³ , melting point: 124 ° C.), except that an oxygen-absorbing layer and a heat-sealing layer were prepared in the same manner as in Example 1 and laminated by extrusion lamination. The maximum stretchable ratio of the laminate of the heat seal layer and the oxygen scavenging layer was 3 times. After stretching the laminate of the heat seal layer and the oxygen scavenging layer at a stretching ratio of 3 times, the oxygen scavenging time of the oxygen scavenging multilayer film to which the aluminum foil is attached is 2
3 hours.

Example 4 The thermoplastic resin of the deoxidizing layer and the heat sealing layer was prepared by using a metallocene-catalyzed linear low-density polyethylene (manufactured by Mitsui Chemicals, Inc., trade name: SP2040, MFR 4.0 g / 10 min, density 0.92 g / cm). ³ , a melting point of 116 ° C.), a deoxygenation layer and a heat seal layer were prepared in the same manner as in Example 1, and laminated by extrusion lamination. The maximum stretchable ratio of the laminate of the heat seal layer and the oxygen scavenging layer was 6 times. After stretching the laminate of the heat seal layer and the oxygen scavenging layer at a stretching ratio of 3 times, the oxygen scavenging time of the oxygen scavenging multilayer film to which the aluminum foil was attached was 20 hours.

Example 5 The deoxygenated thermoplastic resin was a metallocene-catalyzed linear low-density polyethylene (trade name: SP2040, manufactured by Mitsui Chemicals, Inc.)
And low melt viscosity metallocene catalyst linear low density polyethylene (manufactured by Nippon Polychem Co., Ltd., trade names KC570S, MFR
11.0 g / 10 min, density 0.906 g / cm ³ ,
Example 1 except that a 11: 5 weight ratio mixture (melting point: 102 ° C.) was used.
A multilayer film was produced in the same manner as described above. The maximum stretchable ratio of the laminate of the heat seal layer and the oxygen scavenging layer was 7.5 times. After stretching the laminate of the heat seal layer and the oxygen scavenging layer at a stretching ratio of 6 times, the oxygen scavenging time of the oxygen scavenging multilayer film to which the aluminum foil was attached was 17 hours.

COMPARATIVE EXAMPLE The same as in Example 1 except that only the thermoplastic resin of the oxygen-removing layer was changed to polypropylene and low-density polyethylene, ethylene-vinyl acetate copolymer or ethylene-acrylic acid (ester) copolymer was used. Similarly, an oxygen layer was formed. Table 1 shows the resins used and the results of stretching. The laminate of the heat seal layer and the oxygen scavenging layer has a draw ratio of 1.5
It was broken by less than twice, and substantial stretching could not be performed.

[0036]

[Table 1]

[0037]

According to the present invention, a deoxidized multilayer film or sheet having good stretchability and deoxidation properties can be obtained. The deoxidized multilayer body of the present invention is stretched largely without breaking, and the deoxidized layer is highly continuously porous. Therefore, the deoxidized multilayer body of the present invention is a deoxidized film or sheet having a large deoxidation rate from the heat seal layer side,
It can be manufactured industrially.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yasunari Kawabata 6-1-1 Shinjuku, Katsushika-ku, Tokyo Inside Mitsubishi Gas Chemical Co., Ltd. Tokyo Research Laboratory (72) Inventor Kimitaka Nakao 6-1-1 Shinjuku, Katsushika-ku, Tokyo No. 1 In the Tokyo Research Laboratory, Mitsubishi Gas Chemical Co., Ltd. (72) Noriyuki Kimura Inventor, 6-1-1-1 Shinjuku, Katsushika-ku, Tokyo F-term in the Tokyo Research Laboratory Mitsubishi Gas Chemical Co., Ltd. 4F100 AA06 AA18 AA21 AB02 AB10 AB33 AK01A AK01B AK05A AK05B AK07A AK07B AK51G AK63A AK63B BA03 BA07 BA10A BA10C CA09B DJ00B EC18 EH23 EJ37A EJ37B GB15 GB16 JA06B JB16A JB16B JD02C JD03A JL12A YY00Y

Claims (5)

[Claims] An oxygen-permeable thermoplastic resin heat-sealing layer (layer A) is disposed on one side of an oxygen-absorbing layer (layer B) composed of a thermoplastic resin composition containing the oxygen-absorbing composition. A multilayer body composed of at least three layers in which a barrier layer (layer C) made of a gas barrier material is arranged on the other side of the layer B, wherein 50 wt% or more of the thermoplastic resin component of the layer B is: A single-sided absorption deoxygenated multilayer body made of any one of polypropylene, linear low-density polyethylene, and high-density polyethylene, wherein at least the layer B is continuously made porous by stretching. 2. The thermoplastic resin component 5 of the oxygen scavenging layer (layer B).
The multilayer body according to claim 1, wherein 0 wt% or more is a linear low-density polyethylene produced using a single-site catalyst. 3. The thermoplastic resin component of the heat seal layer (A layer) comprises at least 50 wt% of any of polypropylene, linear low density polyethylene and high density polyethylene, and the A layer is stretched together with the B layer. The deoxidized multilayer body according to claim 1, wherein the multilayer body is formed. 4. The multilayer body according to claim 3, wherein 50% by weight or more of the thermoplastic resin component of the heat sealing layer (A layer) is a linear low-density polyethylene produced using a single-site catalyst. 5. The thermoplastic resin component of the oxygen scavenging layer (B layer) comprises:
A low-viscosity thermoplastic resin component having a melt flow rate (MFR) that is at least twice that of the thermoplastic resin mainly used for the B layer is added to the thermoplastic resin mainly used for the B layer in an amount of 3 to
The multilayer body according to claim 1, which contains 40 wt%.