JP3376915B2 - Deoxygenated multilayer body, packaging container using the same, and method of storing food or medicine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deoxidizing multilayer body having excellent heat resistance, a packaging container using the same, and a method for storing food or medicine.

[0002]

2. Description of the Related Art In recent years, as one of the oxygen scavenging technology, a container is constructed with a multilayer material having an oxygen absorbing layer made of an oxygen absorbing resin composition containing an oxygen scavenger composition, and a gas barrier property of the container is formed. In addition, the packaging container in which the container itself is provided with a deoxidizing function is being developed. A packaging container having a deoxidizing function usually has an oxygen absorbing layer made of an oxygen absorbing resin composition containing an oxygen absorbing composition as an intermediate layer,
It is composed of a deoxidizing multilayer body having an outer layer having gas barrier properties on the outer side and an inner layer having oxygen permeability on the inner side. The sheet-shaped or film-shaped deoxidizing multilayer body has been developed as a multilayer resin laminated structure which can be easily formed into a container such as a bag, a cup, a tray, and a bottle.

Examples of the deoxidizing multilayer body include a multilayer film including a layer in which the oxygen scavenger composition disclosed in JP-A-2-72851 and JP-A-4-90848 is dispersed in a resin. Sheets are available. In addition, JP-A-8
Japanese Patent No. 72941 proposes a technique for improving the deoxidizing performance of a deoxidizing multilayer container. In addition, JP-A-7-
Japanese Patent No. 309323 discloses a multilayer container having a deoxidizing function, which uses a polypropylene resin having a specific melting point and an ethylene-vinyl alcohol copolymer having a specific softening point. Further, JP-A-8-132573 and JP-A-9-40024 disclose a structure in which a polyolefin layer is interposed between the oxygen absorption layer and the gas barrier layer.

Foods and pharmaceuticals may be stored in these deoxidizing multilayer containers and subjected to heat sterilization treatment. For example, heat sterilization treatment at a temperature of 105 to 121 ° C. for 20 to 90 minutes, that is, retort treatment, In order to shorten the sterilization time, heat sterilization treatment at a temperature of 121 to 135 ° C. for 2 to 10 minutes, that is, high retort treatment may be performed. However, when heat treatment is performed at a high temperature of 105 ° C. or higher and under high water vapor pressure, the heat resistance of the oxygen permeable layer, the oxygen absorption layer or the polyolefin layer interposed between the oxygen absorption layer and the gas barrier layer is insufficient, resulting in delamination of each layer. However, shrinkage or blocking (fusion) occurs, and the heat sealability is not sufficient, so that the problem of poor sealability and the problem of generation of offensive odor during heating remain. Furthermore, since the impact resistance is weak, when the contents are packed and transported, the oxygen permeable layer or the oxygen absorption layer is cracked, and the oxygen absorber-containing resin layer directly contacts the food, and the contents are soiled. there were.

[0005]

A sheet-like or film-like deoxidizing material having excellent heat resistance and heat sealability, which retains its excellent appearance and impact resistance even when subjected to high temperature sterilization treatment such as high retort treatment. An object of the present invention is to provide a multi-layer body, a packaging container using the same, and a method for storing food or medicine.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies and studies to improve the above-mentioned drawbacks of a deoxidizing multilayer body having an oxygen absorbing layer, and as a result, have found that an oxygen permeable layer comprising an oxygen permeable polyolefin ( 1), an oxygen absorbing layer (2) made of an oxygen absorbing resin composition obtained by blending a deoxidizer composition with a polyolefin, a gas barrier layer (3) made of a gas barrier substance, and a protective layer (4) made of a thermoplastic resin. In a sheet-like or film-like deoxidizing multilayer body in which the respective layers are sequentially laminated, a polyolefin having a specific melting point is used for the layers (1) and (2), and the melting point of the resin for the layer (4). It was found that the above-mentioned problems can be solved by using a deoxidizing multilayer body characterized in that is higher than the layer (1) by 10 ° C. or more, and the present invention has been completed.

That is, the present invention provides an oxygen permeable layer (1) made of an oxygen permeable polyolefin, an oxygen absorbent layer (2) made of an oxygen absorbing resin composition obtained by blending a polyolefin with an oxygen scavenger composition, and a gas barrier property. In a sheet-like or film-like deoxidizing multilayer body in which a gas barrier layer (3) made of a substance and a protective layer (4) made of a thermoplastic resin are sequentially laminated, a layer (1) and a layer (2) And a melting point of the thermoplastic resin of the layer (4) is 10 ° C. or more higher than the melting point of the polyolefin of the layer (1). The present invention also relates to a packaging container in which the above-mentioned deoxidizing multilayer body is used by arranging the layer (1) on at least a part of the wall surface of the container and inside the container. The present invention also seals the food or drug in the above packaging container,
Next, the present invention relates to a method for preserving foods or pharmaceuticals, which is characterized by performing heat treatment at 105 to 135 ° C.

Since the deoxidizing multilayer body and the packaging container of the present invention are excellent in heat resistance, they are suitable for deoxygenation storage applications requiring heat sterilization treatment at high temperature such as high retort treatment. In particular, when heat-treated at 105 to 135 ° C, the food or drug can be satisfactorily stored for a long period of time.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The deoxidizing multilayer body of the present invention (hereinafter,
As a specific example of the layer structure of (may be simply referred to as a multi-layer body), for example, as shown in FIG. 1, layer (1) (oxygen permeable layer) /
Layer (2) (oxygen absorbing layer) / layer (3) (gas barrier layer) /
It is represented by a layer structure composed of the layer (4) (protective layer). This multilayer body is the main layer, layer (1) / layer (2) / layer (3) /
The layer is not limited to the layer (4) alone, and in the example of FIG. 1, any of the layers (1) to (4) may be further added with a layer if necessary. In addition, when the protective layer (4) is subjected to a special treatment such as vapor deposition of aluminum oxide or silicon oxide or coating with polyvinylidene chloride, the layer (4) may also serve as the gas barrier layer (3). Layer (1), which is the main layer in the case of using the multilayer body of the present invention as a packaging container
Explaining the function of each layer of (4), the layer (3) is a gas barrier layer and plays a role of blocking the invasion of oxygen from the outside, the layer (2) is an oxygen absorbing layer, and the layer (3) is It plays a role in absorbing oxygen in the container as well as invading oxygen that cannot be completely blocked. The layer (1) is an oxygen permeable layer, and serves as an isolation layer that prevents direct contact between the oxygen absorbing layer of the layer (2) and the contents stored in the container, and a role of hiding the oxygen absorbent dispersed in the layer (2). , The role of quickly and efficiently permeating oxygen in the container so that the oxygen absorbing layer can fully exert its oxygen absorbing function, and when sealing as a container, the oxygen-absorbing layers of the oxygen-absorbing multilayer body and other barrier materials Plays the role of heat seal surface.

The deoxidizing multilayer body of the present invention and the packaging container made of the same will be described below. The melting points of the polyolefins used for layer (1) and layer (2) are 13
It is 5 ° C or higher. When a polyolefin having a melting point lower than this temperature is used, there is a problem that delamination or shrinkage occurs during heat sterilization treatment of the multilayer body or the packaging container at a high temperature, and the appearance of the multilayer body or the packaging container is impaired.

Further, the polyolefins used for the layer (1) and the layer (2) each have a flexural modulus of 1300 MPa.
It is preferably below, and more preferably below 1000 MPa. Using a polyolefin having a flexural modulus larger than this value reduces the impact resistance of the multilayer body,
There is a case where the resin is cracked and the appearance of the film is deteriorated, or the oxygen-absorbing layer is contaminated by direct contact between the oxygen-absorbing layer and the preserved material such as food or medicine in the cracked portion of the oxygen-permeable layer. It is not preferable because it exists.

Specific examples of the polyolefin used for the layer (1) and the layer (2) include metallocene polyethylene, high density polyethylene, linear low density polyethylene in polyethylenes, propylene homopolymer in polypropylenes, and propylene-ethylene random copolymer. Polymers, propylene-ethylene block copolymers, and other resins include polybutadiene, elastomers such as polymethylpentene and ethylene-propylene rubber, or a mixture thereof. Among the above resins, polypropylenes are used in consideration of heat resistance, heat sealability and impact resistance, and particularly preferably, propylene-ethylene block copolymer, propylene-ethylene random copolymer, these polypropylene and elastomer. And a mixture of these polypropylene and metallocene polyethylene are preferably used. The resins used to form these layers (1) and (2) are preferably compatible with each other and capable of heat fusion.

The melting point of the resin used for the layer (4) which is the protective layer is an oxygen permeable layer in consideration of the heat resistance during heat treatment and the heat sealability when the deoxidizing multilayer body is used as a packaging container. It is necessary to raise the melting point of the polyolefin (1) by 10 ° C. or more. By providing such a melting point difference, it becomes possible to perform good heat sealing in the oxygen permeable layer (1) by heating from the protective layer (4) side.

Specific examples of the resin used for the protective layer include high-density polyethylene for polyethylenes, propylene homopolymer for polypropylenes, propylene-ethylene random copolymers, propylene-ethylene block copolymers, and nylon 6 for polyamides. , Nylon 6,
6, and also polyethylene terephthalate. Of these, polyamide or polyethylene terephthalate is preferably used.

The oxygen scavenger composition to be incorporated in the oxygen-absorbing resin composition used for the layer (2) is one which can obtain water to cause an oxygen-absorption reaction and can be dispersed in polyolefin. As long as they are used, they can be used without limitation, but iron-based oxygen scavengers containing metallic iron as the main agent in the oxygen absorption reaction are preferable, and those containing metallic iron and a metal halide are particularly preferable. Further, iron powder to which a metal halide is attached is particularly preferable. As the main ingredient, metallic iron, as long as it is capable of causing an oxygen absorption reaction, it can be used without any particular limitation in purity etc., for example, even if a part of the surface is already oxidized or contains another metal. It may be. Further, the metallic iron is preferably granular or fibrous, and for example, reduced iron powder, atomized iron powder, iron powder such as electrolytic iron powder, Dalai powder, cast iron, crushed products of various iron such as steel, and ground products are used. To be It is preferable that the iron powder is fine in order to reduce the layer thickness of the oxygen absorbing resin, and the average particle size is 20
It is preferably 0 μm or less, and particularly preferably 1 to 100 μm.

The metal halide catalytically acts on the oxygen absorption reaction of the main agent. As the metal halide, for example, chlorides, bromides and iodides of alkali metals or alkaline earth metals are used, and chlorides such as lithium, sodium, potassium, magnesium, calcium and barium are preferably used. The metal halide content is preferably 0.1 to 100 parts by weight of metallic iron.
20 parts by weight, more preferably 0.1 to 5 parts by weight.
In particular, by adhering the metal halide to the iron powder, the compounding amount of the metal halide can be reduced.

The metal halide is compounded in the resin together with metallic iron as one component of the oxygen scavenger composition, but it is preferable to add it in advance by mixing so that it does not easily separate from the metal in the resin. . For example, a method of mixing a metal halide and iron powder using a ladle machine, a ball mill, a speed mill, etc., a method of embedding a metal halide in a recess on the surface of iron powder, and a method of attaching a metal halide to the surface of iron powder using a binder. And a method of mixing the metal halide aqueous solution with the iron powder, and then drying and adhering it to the surface of the iron powder.

In the present invention, in order to obtain a sheet-like or film-like deoxidizing multilayer body having a good appearance, it is preferable to add an alkaline earth metal oxide to the oxygen-absorbing resin composition of the layer (2). . Examples of the alkaline earth metal oxide include magnesium oxide, calcium oxide, strontium oxide, and barium oxide, and magnesium oxide or calcium oxide is particularly preferable from the viewpoints of availability and reactivity. The particle size of the alkaline earth metal oxide is preferably in the range of 1 to 200 μm in average particle diameter,
The range of 50 μm is more preferable. The particle size of the alkaline earth metal oxide is preferably equal to or smaller than the particle size of the oxygen absorber composition. By blending the above-mentioned alkaline earth metal oxide in the layer (2), it is possible to prevent foaming caused by moisture when forming a film- or sheet-like multilayer body, and to obtain a multilayer body having a good appearance. You can

Further, in order to improve the flavor retention of the contents to be stored in the present invention, it is preferable to add an adsorbent to the oxygen absorbing resin composition. Generally, the larger the specific surface area, the better the adsorption performance of the adsorbent. Specific surface area is 10
It is preferably 0 m ² / g (BET method) or more, 500
Those having m ² / g or more are particularly preferably used. As the adsorbent having an adsorbing ability, an adsorbent that adsorbs 2% or more of water when stored at 23 ° C. and 60% RH is preferable. Specific examples include activated carbon, zeolite, activated alumina, etc. Activated carbon is most preferably used because of its function of adsorbing components. As activated carbon, palm shell, wood,
The thing made from coal is used. The method of making activated carbon is
Although not particularly limited, activated carbon obtained by a production method such as a steam activation method or a zinc chloride activation method is preferably used. The particle size is preferably in the range of 1 to 200 μm in average particle size, and 1
The range of ˜50 μm is more preferred. The particle size of the activated carbon is preferably equal to or smaller than the particle size of the deoxidizing composition. Activated carbon includes dry dry carbon and wet carbon containing water in advance, but the water content is 10% (J
Dry carbon of ISK1470) or less is preferably used. The higher the water content, the more the amount of the alkaline earth metal oxide compounded to remove the water in the activated carbon is required, which is not preferable. The adsorption performance of activated carbon is generally represented by methylene blue decolorizing power and caramel decolorizing power, but in order to efficiently adsorb offensive odor components, it is preferable that both methylene blue decolorizing power and caramel decolorizing power are high. Is over 90% (JISK1470)
And methylene blue decolorizing power of 150 ml / g or more (JI
Activated carbon of SK1470) is preferably used.

The content of the oxygen absorber composition in the oxygen absorbing resin composition is preferably 2 to 93% by weight, more preferably 5 to 70% by weight. When the oxygen absorber composition content is less than the above range, sufficient oxygen absorption performance cannot be obtained,
On the other hand, if it is too high, problems occur in the mechanical strength and moldability of the resin composition. The content of activated carbon in the oxygen absorbing resin composition is preferably 0.1 to 5 parts by weight. When the content of activated carbon is less than the above range, sufficient flavor retention cannot be obtained,
On the other hand, if it is too high, problems occur in the mechanical strength and moldability of the resin composition. Further, the content of the alkaline earth metal oxide in the oxygen absorbing resin composition is preferably 0.1 to 5% by weight. When the content of the alkaline earth metal is less than the above range, a sufficient water removing effect cannot be obtained, and when it is too large, even the water necessary for the deoxidation reaction is adsorbed and the oxygen absorption reaction of the oxygen absorbing resin composition is inhibited. It is not preferable because The thickness of the oxygen absorbing layer (2) is preferably 200 μm or less,
It is more preferably not more than μm.

The gas barrier layer (3) is made of a gas barrier substance and is a layer for blocking oxygen invading from the outside of the container. For example, metal foil such as aluminum foil, ethylene vinyl alcohol copolymer, nylon MXD6, polyester, etc. A gas barrier resin, a resin film deposited with aluminum oxide, silicon oxide, aluminum, or the like is used alone or in combination. When a barrier film obtained by vapor-depositing aluminum oxide or silicon oxide on a heat-resistant film such as a polyester film or a nylon film, or a film subjected to a treatment such as coating with polyvinylidene chloride is used, a gas barrier layer and a protective layer are used. Can also serve as When a resin is used for the gas barrier layer, the melting point of the resin is preferably 145 ° C or higher.

The oxygen permeable layer (1) has a role of efficiently permeating oxygen, a function of separating a packaged object such as food from an oxygen scavenger in the oxygen absorbing layer to prevent contamination, and a container molding process. Plays a role as a heat seal layer. The thickness of the oxygen permeable layer (1) is preferably 20 μm or more. If it is lower than this value, the heat seal strength becomes insufficient, and there arises a problem that the sealability is impaired when the heat sterilization treatment at high temperature is performed. The oxygen permeable layer may be colored in order to improve the appearance of the multilayer body or the packaging container. in this case,
It is preferable to add, for example, 2 to 30% by weight of titanium oxide as a coloring pigment to the polyolefin used.

The deoxidizing multilayer body of the present invention is produced by combining known lamination methods such as extrusion lamination, dry lamination and coextrusion depending on the layer structure of the multilayer body or the material and properties of each layer.
For example, the lamination of the oxygen permeable layer (1) and the oxygen absorbing layer (2) is preferably performed by extrusion lamination. The oxygen absorbing layer (2) is extruded and laminated by using the oxygen permeable layer (1) as a base material, a gas barrier layer is laminated on the oxygen absorbing layer (2) side of the obtained film by dry lamination, and a protective layer is further provided on the gas barrier layer side. Of oxygen permeable layer (1)
It is possible to obtain a deoxidizing multilayer film composed of / oxygen absorbing layer (2) / gas barrier layer (3) / protective layer (4).

In the extrusion lamination, the melt flow rate of the polyolefin used for the oxygen absorbing layer (2) is 15 to 35 g / 10 minutes (JIS K7210; 23).
It is preferably 0 ° C. and 2.16 kgf). If a polyolefin having a melt flow rate outside the above range is used, the oxygen absorbing layer (2) containing the oxygen scavenger may have poor film-forming properties, and the appearance of the oxygen scavenging multilayer body may be impaired.

By using the deoxidizing multilayer body obtained in the present invention for a part or all of a hermetically sealed container, the oxygen inside the container is absorbed in addition to the oxygen slightly entering from the outside of the container,
It is possible to prevent deterioration of the contents stored in the container due to oxygen. That is, by packaging the film- or sheet-shaped deoxidizing multilayer body into a packaging container such as a bag, a cup, or a tray, and by using it as a member such as a lid of a container or a top seal film, the packaging is performed. A deoxidizing function is added to the container. Further, in the film-shaped deoxidizing multilayer body, two side films and one bottom film 1 are used.
Independent self-contained bag (standing pouch)
Side film 2 that can be used as a bag
Not only when all of the sheets and one film for the bottom surface are film-shaped deoxidizing multilayer bodies, but of course, only one film for the side surface or two sheets are film-shaped deoxidizing multilayer bodies or only one film for the bottom surface. In the case where is a film-shaped deoxidizing multilayer body, the deoxidizing function is imparted by using the deoxidizing multilayer body in a part of the bag, and it is possible to exert an effect on food preservation.

The packaging container using the deoxidizing multilayer body of the present invention can be sealed with foods or pharmaceuticals and then subjected to heat treatment at 105 ° C. or higher and 135 ° C. or lower, so that long-term storage of foods or pharmaceuticals is possible. It will be possible. That is, even if the packaging container is subjected to heat treatment in the above temperature range, it is excellent in heat resistance, sealing property and impact resistance, and by removing oxygen inside the container and blocking oxygen invading from outside the container, It has a remarkable effect on maintaining the quality of pharmaceutical products. The heating time for sterilization is not particularly limited, but 4 for effective sterilization.
Minutes or more and 90 minutes or less are preferable.

[0027]

EXAMPLES The present invention will be described in more detail with reference to examples. The present invention is not necessarily limited to the embodiments. [Production Example 1] 100 kg of reduced iron powder having an average particle diameter of 30 μm was put into a vacuum mixing dryer with a heating jacket, and 10 m
While heating at 140 ° C. under a reduced pressure of mHg, 5 kg of a 50% by weight aqueous solution of calcium chloride was sprayed and dried, followed by sieving to remove coarse particles over 80 μm to obtain an oxygen absorber composition having a maximum diameter of 80 μm. Next, a melting point of 148 ° C. and a melt flow rate of 23 g were measured by using an extruder composed of a 45 mmφ co-rotating twin-screw extruder with a vent and a quantitative feeder.
/ 10 minutes (230 ° C, 2.16kgf, JIS K72
10), flexural modulus 880 MPa (JIS K675
The propylene-ethylene random copolymer of 8) and the above oxygen absorber composition were kneaded at a weight ratio of 1: 1 and extruded from a strand die, followed by air cooling and crushing to obtain a masterbatch A. Similarly, using the above extruder, an average particle size of 20
A masterbatch B was obtained by kneading μm of calcium oxide and the propylene-ethylene block copolymer at a weight ratio of 1: 1.

Then, using a tandem extrusion laminator having two sets of extruders consisting of a single-screw extruder, a T-die and a cooling roll, a propylene-ethylene block copolymer fed out had a thickness of 50 μm, a melting point of 167 ° C. and a bending elasticity. The masterbatch A and the masterbatch B are weighted from a first extruder to one surface of an unstretched polypropylene film (oxygen permeable layer (1)) having a rate of 910 MPa by a weight ratio A: B = 1.
The dry-blended mixture was extruded to a ratio of 9: 1 to obtain a film in which an oxygen absorbing layer (2) having a thickness of 30 μm was laminated on the layer (1). The film-forming property at the time of extrusion was good, and a film having an excellent appearance could be obtained.

Oxygen absorbing layer (2) of the obtained multilayer film
Is dry laminated with a 9 μm thick aluminum foil (gas barrier layer (3)), and a 12 μm thick polyethylene terephthalate film (protective layer (4)) is dry laminated on the aluminum foil to form an oxygen permeable layer. (1)
A deoxidizing multilayer body consisting of / oxygen absorbing layer (2) / gas barrier layer (3) / protective layer (4) was obtained.

[Example 1] Using the deoxidized multilayer body obtained in Production Example 1, a self-supporting bag (standing pouch) was prepared with the layer (1) facing inside. First, two side films (150 × 90 mm) and one bottom film (55 × 90 mm) were cut out from the multilayer body, the bottom film was folded in two, and both ends were partially cut out to obtain two side films. By sandwiching and heat-sealing the both, a bag having an open upper part (length 150 mm × width 90 mm × bottom width 55 mm) was obtained. This self-supporting bag was filled with 150 g of porridge, and the opening was heat-sealed and hermetically sealed. The amount of air in the bag was about 5 cc. A self-supporting bag (standing pouch) composed of a deoxidizing multilayer body filled with porridge and sealed was heat-treated at 135 ° C. for 8 minutes. After the treatment, the appearance of the self-supporting bag was observed, and it was confirmed that there was no abnormality in the heat-sealed portion such as leakage, and there was no abnormality such as heat shrinkage or blocking (fusion) between the oxygen permeable layers on the inner surface. Store the self-supporting bag composed of this deoxidizing multilayer body at 25 ° C,
On the 30th day, it was opened and evaluated for aroma and flavor. The porridge after being stored for 30 days had no offensive odor such as an oxidative odor and had a good flavor. Furthermore, when observing the inner surface,
It was confirmed that there was no delamination of the film or cracks in any of the layers (1) to (4). When the heat-sealing strength between the side films of the bag made by the bag was measured by a push-pull gauge, the bag had a strength of 4.9 kg in a width of 15 mm. In addition, a drop test from a height of 80 cm according to the strength testing method of the Ministry of Health and Welfare Notification No. 370 No. 3 equipment and containers and packaging was carried out on this bag, and it was confirmed that there was no abnormality in the seal part and there was no leakage of the contents.

As shown by the above results, the packaging container using the deoxidizing multilayer body of the present invention has heat resistance, impact resistance, and
It is a deoxygenated packaging container having excellent heat-sealing properties and excellent flavor retention of the contents, and is suitable for storage of foods and the like that require high-temperature heat sterilization treatment.

[0032]

The deoxidizing multilayer body of the present invention is a deoxidizing multilayer body having excellent heat resistance, appearance, heat sealability and impact resistance, and further excellent oxygen absorbing performance. Moreover, the packaging container using the deoxidizing multilayer body of the present invention is excellent in heat resistance in which heat shrinkage, delamination or blocking between inner surfaces (fusion) does not easily occur even when heat sterilization treatment is performed at high temperature. A packaging container that can be stored for a long period of time without impairing the flavor of foods and other items to be packaged. Therefore, the packaging container according to the present invention is useful as a heat-resistant packaging container capable of heat sterilization treatment such as retort sterilization and high retort sterilization, and heat treatment of pharmaceutical products such as foods and infusions including high-moisture foods. It can be widely used as a packaging container for articles that require.

[Brief description of drawings]

FIG. 1 is a sectional view of a deoxidizing multilayer body of the present invention.

[Explanation of symbols]

Layer (1); oxygen permeable layer Layer (2); oxygen absorption layer Layer (3); Gas barrier layer Layer (4); protective layer

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-206034 (JP, A) JP-A 8-72941 (JP, A) JP-A 5-38779 (JP, A) JP-A 1- 278344 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B32B 1/00-35/00 B65D 81/18-81/30

Claims (6)

(57) [Claims] 1. An oxygen permeable layer (1) made of an oxygen permeable polyolefin, an oxygen absorbing layer (2) made of an oxygen absorbing resin composition prepared by blending a polyolefin with a deoxidizer composition,
In a sheet-like or film-like deoxidizing multilayer body in which each layer is sequentially laminated, which comprises a gas barrier layer (3) made of a gas barrier substance and a protective layer (4) made of a thermoplastic resin, the layers (1) and ( The melting point of the polyolefin of 2) is 135 ° C. or higher, and the melting point of the thermoplastic resin of the layer (4) is 10 ° C. higher than the melting point of the polyolefin of the layer (1).
A deoxidizing multilayer body characterized by being higher than the above. 2. A deoxidizing multilayer body according to claim 1, wherein the layer (1) has a thickness of 20 μm or more. 3. The bending elastic moduli (JISK6758) of the polyolefins of layer (1) and layer (2) are respectively 1300M.
The deoxidizing multilayer body according to claim 1, which has Pa or less. 4. The melt flow rate of the polyolefin of the layer (2) is 15 to 35 g / 10 minutes (JIS K7210;
The deoxidizing multilayer body according to claim 1, which has a temperature of 230 ° C. and 2.16 kgf). 5. The deoxidizing multilayer body according to any one of claims 1 to 4, and a layer (1) on at least a part of a wall surface of the container.
A packaging container that is used by arranging the inside of the container. 6. A method for preserving food or medicine, which comprises sealing the food or medicine in the packaging container according to claim 5 and then heat-treating at 105 to 135 ° C.