WO2003025048A1

WO2003025048A1 - Method for producing oxygen-capturing packaging material and oxygen-capturing packaging material

Info

Publication number: WO2003025048A1
Application number: PCT/JP2002/009322
Authority: WO
Inventors: Peter Frisk; Tadakatsu Ikenoya; Hiroaki Ogita
Original assignee: Tetra Laval Holdings & Finance S.A.
Priority date: 2001-09-18
Filing date: 2002-09-12
Publication date: 2003-03-27

Abstract

A method for producing an oxygen-capturing packaging material, which comprises blending an ethylene-vinyl alcohol copolymer or polyethylene terephthalate as a carrier of a barrier resin with an oxygen-capturing agent to form an oxygen-capturing resin for dispersion, dispersing the oxygen-capturing resin in a polyolefin or polyamide as a matrix resin to form an oxygen-capturing composite material, and forming a packaging material by the use of the oxygen-capturing composite material. A container formed by using the packaging material exhibits excellent oxygen-barrier properties and excellent mechanical strength with a thinner thickness, and thus may be reduced in weight.

Description

Description Method for manufacturing oxygen-scavenging packaging materials and oxygen-scavenging packaging materials

The present invention relates to a method for producing an oxygen-scavenging packaging material excellent in oxygen barrier properties and suitable for packaging liquid foods, and an oxygen-scavenging packaging material. Background art

As paper containers for liquid foods such as juice, coffee, milk, and liquors, paper containers made of laminates of paper and thermoplastic resin have become widespread. In the paper container, the outermost layer (the layer that contacts the outside air) and the innermost layer (the layer that contacts the liquid food) are usually made of a thermoplastic resin layer. The material has poor oxygen barrier properties, and its contents degrade from the permeated oxygen and its quality is reduced.

There is known a packaging material comprising a laminate in which a resin layer containing an oxygen scavenger is provided as an inner layer in order to prevent the quality of the content from being deteriorated due to oxygen permeation. Examples of the resin in the resin layer include ethylene-vinyl alcohol copolymer and polyethylene terephthalate having good compatibility with the oxygen scavenger.

However, when a conventional ethylene-vinyl alcohol copolymer layer or polyethylene terephthalate layer containing an oxygen scavenger is used as a packaging laminate material, the oxygen scavenger, ethylene-vinyl alcohol copolymer or polyethylene terephthalate The sauce is not compatible with other laminated materials such as polyolefins and oxygen In order to maintain compatibility and improve compatibility, it was necessary to increase the thickness of the barrier layer containing an oxygen scavenger.

When an ethylene-bier alcohol copolymer layer containing an oxygen scavenger and a polyethylene terephthalate layer are used as a packaging laminate material, the packaging material thickens the oxygen scavenger-containing barrier layer. Does not have mechanical strength. When a laminated packaging material containing an ethylene-pier alcohol copolymer layer containing an oxygen scavenger and a polyethylene terephthalate layer is molded into a paper container, the oxygen scavenging agent's mechanism of oxygen scavenging causes oxygen Poor oxygen scavenging capacity based on the amount of scavenger, ethylene-vinyl alcohol copolymer and polyethylene terephthalate used; that is, use oxygen scavenger, ethylene-vinyl alcohol copolymer and polyethylene terephthalate However, its oxygen collection efficiency is inferior. Disclosure of the invention

An object of the present invention is to provide a method for producing an oxygen-scavenging packaging material having an excellent oxygen barrier property and capable of preventing a deterioration in the quality of contents caused by oxygen permeation even if the oxygen-scavenging layer is thin. It is to provide.

An object of the present invention is to provide an oxygen-scavenging packaging material that exhibits the maximum oxygen-scavenging ability of an oxygen-scavenging agent, an ethylene-pinyl alcohol copolymer and polyethylene terephthalate, and has an excellent oxygen-scavenging efficiency. To provide an oxygen-scavenging packaging material.

An object of the present invention is to provide a method for producing a strong oxygen-scavenging packaging material by thinning an oxygen-scavenging layer having no mechanical strength, and to provide an oxygen-scavenging packaging material. The method for producing an oxygen-scavenging packaging material according to the present invention comprises the steps of blending an oxygen-scavenging agent with a carrier of an ethylene-vinyl alcohol copolymer or a polyethylene terephthalate barrier resin to form an oxygen-scavenging dispersion resin. Forming, dispersing the oxygen-scavenging dispersion resin in a polyolefin or polyamide matrix resin to form an oxygen-scavenging composite material, and forming a packaging material using the oxygen-scavenging composite material Including doing.

In a preferred embodiment of the method for producing an oxygen-scavenging packaging material according to the present invention, an adhesive resin having a polyolefin compatibility with an ethylene-vinyl alcohol copolymer or a polyethylene terephthalate carrier resin and an oxygen-scavenging resin are provided. An oxygen-scavenging dispersing resin to form an oxygen-scavenging dispersed resin; dispersing the oxygen-scavenging dispersed resin in a polyolefin matrix resin to form an oxygen-scavenging composite material; The packaging material is formed using the conductive composite material.

In another preferred embodiment of the method for producing an oxygen-scavenging packaging material according to the present invention, an oxygen-scavenging agent is blended with a carrier of a barrier resin such as an ethylene-vinyl alcohol copolymer or polyethylene terephthalate. Forming an oxygen-dispersing resin, dispersing the oxygen-scavenging dispersing resin in a polyamide matrix resin to form an oxygen-scavenging composite material, and extruding the oxygen-scavenging composite material. To form a packaging material consisting of a paper laminate.

In another preferred embodiment of the method for producing an oxygen-scavenging packaging material according to the present invention, a packaging material is formed by using the oxygen-scavenging composite material to form an opening device by injection molding.

The oxygen-scavenging packaging material according to the present invention comprises a paper layer and a thermoplastic resin layer on both sides thereof. In a packaging material formed from a laminate having: an oxygen-scavenging agent, an oxygen-scavenging agent comprising an ethylene-vinyl alcohol copolymer or polyethylene terephthalate and an adhesive resin, inside the paper layer. Dispersed resin particles have an oxygen-scavenging composite layer dispersed in a polyolefin matrix.

In a preferred embodiment of the oxygen-scavenging packaging material according to the present invention, the oxygen-scavenging composite material layer has an oxygen noria layer between the paper layer and the oxygen-scavenging composite material layer.

An oxygen-scavenging packaging material according to the present invention is a packaging material formed from a laminate having a paper layer and a thermoplastic resin layer on both sides thereof, wherein an oxygen-scavenger and ethylene-vinyl alcohol are contained inside the paper layer. It has an oxygen-scavenging composite material layer in which oxygen-scavenging dispersed resin particles of a polymer or polyethylene terephthalate are dispersed in a polyamide matrix.

In a preferred embodiment of the oxygen-scavenging packaging material according to the present invention, the oxygen-scavenging agent is a sulfite. BEST MODE FOR CARRYING OUT THE INVENTION

The oxygen-scavenging packaging material according to the present invention is a packaging material formed from a laminate having a paper layer and thermoplastic resin layers on both sides thereof.

As the paper constituting one layer of the packaging material of the present invention, for example, the basis weight is 50 to 35

0 g / ^mz paper for paper containers, paperboard, and paper-based laminates can be used.

The thermoplastic resin constituting one layer of the packaging material of the present invention includes polyolefin, polyamide, polyester, polychlorinated biel, polystyrene, methacrylic resin, and ethylene-unsaturated carboxylic acid copolymer, ionomer, and unsaturated monomer. Carboxylic acid modification Examples include polyolefin, cyclic olefin copolymer, ethylene-vinyl alcohol copolymer, polyvinyl alcohol having a saponification degree of 95% or more, and acetyl cellulose. Examples of the polyolefin include polyethylene, polypropylene, ethylene-propylene copolymer, and polybutene-1. Examples of the polyamide include polyamide 6, polyamide 6-6, polyamide-11, polyamide-12, and the like. Examples of the polyester include polyethylene terephthalate and polybutylene terephthalate. Of these, polyolefins are preferred. Examples of the polyethylene include high-density polyethylene, medium-density polyethylene, low-density polyethylene, linear low-density polyethylene (LLDPE), and linear low-density polyethylene (mL LDPE) produced by using a metallocene catalyst. No.

In the packaging material of the present invention, an oxygen-scavenging agent, and an oxygen-scavenging dispersed resin particle composed of an ethylene-vinyl alcohol copolymer or polyethylene terephthalate and an adhesive resin are formed of polyolefin inside the paper layer. It has an oxygen-scavenging composite material layer dispersed in a matrix.

Examples of the oxygen scavenger in the present invention include sulfites, reducing organic compounds, and reduced metals. The sulfite is sodium sulfite, potassium sulfite, or the like. The reducing organic compounds include ascorbic acids, polyvalent phenols, and catechins. Ascorbic acid is a mixture thereof such as ascorbic acid, arapoascorbic acid and their salts (sodium salt, potassium salt, etc.). Polyhydric phenols include pyrogallol, catechol, gallic acid, resorcinol, hydroquinone, and mixtures thereof. Catechins are epicatechin, epiga mouth Catechin, epicatechin gallate, epigallocatechin gallate, etc., and mixtures thereof. Among these reducing organic compounds, ascorbic acids and dextrins, particularly ascorbic acid and arapoascorbic acid, are preferred. The reduced metal is reduced iron. Of these oxygen scavengers, sulfites, especially sodium sulfite, are preferred. The content of the oxygen scavenger is 5 to 30% by mass based on the total of the ethylene-pinyl alcohol copolymer or polyethylene terephthalate and the oxygen scavenger in the oxygen-scavenging composite material layer. It is particularly preferably from 10 to 15% by mass.

The adhesive resin contained in the oxygen-scavenging dispersed resin particles of the present invention is used for preparing an oxygen-scavenging composite material layer by dispersing it in a polyolefin matrix. The adhesive resin includes, for example, an acrylic resin adhesive resin, a modified polyolefin adhesive resin, an ethylene-vinyl acetate copolymer adhesive resin, a polyamide adhesive resin, an epoxy resin adhesive resin, and the like. The acrylic resin-based adhesive resin includes a polymer or a copolymer of acrylic acid or methacrylic acid or an alkyl ester thereof. Modified polyolefin-based adhesive resins include polyethylene, polypropylene, and other unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, nadic acid, and nadic anhydride or anhydrides thereof. The product is obtained by grafting in the presence of an organic peroxide. Among these adhesive resins, a modified polyolefin adhesive is particularly preferred.

The oxygen-scavenging packaging material according to the present invention is an oxygen-scavenging dispersing resin particle comprising an oxygen-scavenging agent and an ethylene-pier alcohol copolymer or polyethylene terephthalate in which oxygen-dispersing resin particles are dispersed in a polyamide matrix. It has a trapping composite material layer. In this embodiment, the polyamide of the matrix resin of the oxygen-scavenging composite material layer includes polyamide MXD6, polyhexamethylenediamine terephthalate (polyamide 6T), polyhexamethylenediamineisophthalamide, and a xylene group-containing polyamide. Includes aromatic polyamides such as polyamides, aliphatic polyamides such as polyamide 4-6, polyamide 6, polyamide 6-6, polyamide 6-10, polyamide 6-12, polyamide 11 and polyamide 12, and the like. Among these, when the resin contained in the oxygen-scavenging composite material layer is an ethylene-vinyl alcohol copolymer, an aromatic polyamide is preferable, and when the resin is polyethylene terephthalate, an aliphatic polyamide is preferable.

The content of polyamide in the oxygen-scavenging composite material layer is preferably 50% by mass or more, and particularly preferably 80 to 90% by mass. Therefore, the content of the ethylene-vinyl alcohol copolymer or polyethylene terephthalate containing the oxygen scavenger is preferably 50% by mass or less, particularly preferably 10 to 20% by mass.

When the oxygen-scavenging composite material layer is made of an aromatic polyamide containing an ethylene-vinyl alcohol copolymer, the oxygen-scavenging composite material layer can contain an aliphatic polyamide. In this case, the content of the aliphatic polyamide is preferably set to 10 to 20% by mass of the oxygen-scavenging composite material layer containing the aliphatic polyamide. The oxygen scavenging composite material layer, if made of polyethylene terephthalate tallates including aliphatic polyamides, the said layer, the further content of the aromatic polyamide during the ₉ to Ru can contain aromatic polyamides, aromatic The content is preferably 10 to 20% by mass of the oxygen-scavenging composite material layer containing polyamide.

According to the production method of the present invention, the oxygen-scavenging packaging material is An oxygen-scavenging agent is blended with a carrier of an alcohol copolymer or polyethylene terephthalate barrier resin to form an oxygen-scavenging dispersion resin, and the oxygen-scavenging dispersion resin is contained in a polyolefin or polyamide matrix resin. It is obtained by dispersing the collective dispersion resin to form an oxygen-collecting composite material, and forming a packaging material using the oxygen-collecting composite material.

Adhesive resin is mixed with a mixture of oxygen scavenger and ethylene-vinyl alcohol copolymer or polyethylene terephthalate, if necessary, and the resulting masterbatch of oxygen-scavenging dispersed resin is mixed with polyolefin matrix. And disperse.

The mixing ratio between the mixture and the adhesive resin is such that the mixture is 50 to 90% by mass, preferably 70 to 80% by mass, and the adhesive resin is 10 to 50% by mass, preferably 20 to 30% by mass.

A master batch of oxygen-scavenging dispersed resin obtained by mixing an adhesive resin with a mixture of the oxygen-scavenging agent and ethylene-vinyl alcohol copolymer or polyethylene terephthalate, and polyolefin, a blend of It can be obtained by mechanically blending with an ordinary kneader. The blending ratio between the masterbatch and the polyolefin is 5 to 40% by mass, preferably 10 to 20% by mass for the masterbatch, and 60 to 95% by mass, preferably 80 to 90% by mass for the polyolefin. %.

A preferred embodiment of the oxygen-scavenging packaging material according to the present invention is a packaging material formed from a laminate having a paper layer and a thermoplastic resin layer on both sides thereof, wherein an oxygen-scavenger, ethylene Monovinyl alcohol copolymer or polyethylene An oxygen-scavenging composite material layer in which oxygen-scavenging dispersed resin particles composed of a sheet and an adhesive resin are dispersed in a polyolefin matrix.

The oxygen-scavenging packaging material of the present invention can have a barrier layer between the paper layer and the oxygen-scavenging composite material or at a layer position.

The barrier layer is a barrier material alone or a multilayer containing a barrier material. The barrier material is aluminum foil, silicon oxide-deposited polyethylene phthalate, ethylene-vinyl alcohol copolymer, polyamide resin, or the like. The multilayer structure including barrier material is made of polyethylene film Z aluminum foil, adhesive polyethylene, silicon oxide vapor-deposited polyethylene terephthalate biaxially stretched film (Z adhesive), polyethylene film / adhesive / ethylene-pier alcohol Copolymer film / adhesive, polyamide resin film / adhesive, etc. The thickness of the barrier layer is usually between 5 and 25 m.

The adhesive layer provided inside the oxygen-scavenging composite material layer includes, for example, an acrylic resin-based adhesive, a modified polyolefin-based adhesive, an ethylene-vinyl acetate copolymer, a polyamide-based adhesive, and an epoxy resin-based adhesive. It is. The acrylic resin adhesive is a polymer or copolymer of acrylic acid or methacrylic acid or an alkyl ester thereof. Modified polyolefin adhesives include polyethylene, polypropylene, and other unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, nadic acid, and nadic acid anhydride or anhydrides thereof. Is a resin obtained by grafting in the presence of an organic peroxide. The adhesive layer is provided inside the layer of the oxygen-absorbing composite material containing the polyamide matrix. In particular, it is desirable to provide it in contact with the layer. The thickness of this adhesive layer is usually 5 ~ 30m It is.

The number of thermoplastic resin layers provided outside the paper layer is not limited to one, and two or more thermoplastic resin layers can be provided. In that case, the thermoplastic resin is preferably polyolefin. When that layer is the outermost layer of the packaging material, polyethylene is particularly preferred. The polyethylene is a high-density polyethylene, a medium-density polyethylene, a low-density polyethylene, a linear low-density polyethylene, a mLLDPE or the like, and preferably a low-density polyethylene and a linear low-density polyethylene.

The number of thermoplastic resin layers provided inside the paper layer is not limited to one, and two or more thermoplastic resin layers can be provided. In that case, the thermoplastic resin is preferably polyolefin. When that layer is the innermost layer of the packaging material, polyethylene is particularly preferred. Polyethylene is particularly preferably linear low-density polyethylene and mLLDP. The thickness of these thermoplastic resin layers is usually 5 to 200 m.

The packaging material of the present invention comprises a laminate. Laminating methods include laminating each layer using an adhesive, laminating a layer that can be melted by heat, and laminating with a layer that is in contact with it, and laminating layers that can be simultaneously extruded by simultaneous extrusion. And how to combine them.

In a preferred embodiment of the method for producing an oxygen-scavenging packaging material according to the present invention, an oxygen-scavenging dispersing resin is formed by blending an oxygen-scavenging agent into a barrier resin carrier, and the polyamide matrix resin includes: Disperse the oxygen-scavenging dispersion resin to form an oxygen-scavenging composite material, and extrude and laminate the oxygen-scavenging composite material directly on the paper layer to form a packaging material consisting of a paper laminate .

Brick shape, gable top shape, cube, cylinder The container can be shaped like a parallelepiped, a parallel hexagonal prism, a parallel octagonal prism at the center of the body, a quadrilateral at the top and bottom, and a patch.

In another preferred embodiment, a packaging material is formed by injection molding using an oxygen-scavenging composite material to form an opening device such as a spat, a plug, a lid, a drinking spout, a spout, and a spout. . Example

Hereinafter, the present invention will be described in detail with reference to Examples.

(Example 11)

Sodium sulfite (Na ₂ S0 ₃₎ which contained 15 wt% ethylene-vinyl § alcohol copolymer 70 parts by weight of polypropylene modified polyolefin obtained by grafting maleic anhydride melted and (adhesive resin) 30 parts by kneading Then, a master batch of the oxygen-scavenging dispersing resin was prepared. After blending 10 parts by mass of this mass and 90 parts by mass of polypropylene equivalent to 20 gZ of melt per mouth, the mixture is extruded, and the oxygen-scavenging composite material in which the oxygen-scavenging dispersion resin is dispersed in the matrix resin A pellet was formed.

Low-density polyethylene (LDPE) with a density of 0.924 gZcm ³ , paper (250 g / m ² basis weight), polypropylene (PP) with a melt flow rate of 20 gZ, ethylene-vinyl alcohol copolymer (EVOH), A modified polyolefin-based adhesive obtained by grafting maleic anhydride on polypropylene, the pellet obtained above, and a linear low-density polyethylene (LLDPE) having a density of 0.910 g / cm ³ were prepared. Push LDPE (thickness 15 m) (outermost layer) / paper / PP (thickness 10 m) / EVOH (thickness 10 m) / modified polyolefin adhesive (thickness 10) A packaging material having a laminated configuration of the oxygen-scavenging composite material (thickness: 15 lim) ZLLDPE (thickness: 25 m) (innermost layer) of the pellet obtained in step (1) was manufactured.

Using the packaging material produced above, a 200ml 1-prick type liquid food container was prepared and filled with a vitamin C solution. As a result of observing the change in vitamin C concentration immediately after filling and in the container where it was stored at 23 ° C for 4 weeks, the vitamin C concentration was 95% of the initial concentration.

(Examples 1-2)

The pellets were prepared in the same manner as in Example 11 except that polyethylene terephthalate containing 15% by mass of sodium sulfite was used instead of the ethylene-vinyl alcohol copolymer containing 15% by mass of sodium sulfite. Molded. A packaging material was produced in the same manner as in Example 11-11, except that the pellets obtained above were used instead of the pellets used in Example 11-11. Using this packaging material, a container was prepared and filled with a vitamin C solution in the same manner as in Example 1-1, and the change in the concentration of vitamin C in the container was observed. At 95% of the concentration.

(Comparative Example 1-1)

A pellet was formed in the same manner as in Example 11 except that the modified polyolefin was not used as the adhesive resin, but the ethylene-vinyl alcohol copolymer containing sodium sulfite and the matrix resin, polypropylene, were uniformly kneaded. As a result, the obtained pellets could not be used as a material for producing a packaging material.

(Comparative Example 1-2)

Example 11 In the same manner as in Example 11 except that the pellet used in Example 11 was replaced with an oxygen-trapping pellet obtained by uniformly mixing the oxygen-trapping resin in the matrix resin. To produce packaging materials. Using this packaging material, a container was prepared and a vitamin C solution was filled in the same manner as in Example 1-1, and the change in the concentration of vitamin C in the container was observed. It was 90% of the concentration. Moreover, this packaging material is inferior in strength to the packaging material obtained in Example 11-11.

(Example 2-1)

Low-density polyethylene (LDPE) film with a density of 0.924 g / cm ³ (thickness 15 m) (outermost layer) Z paper (basis weight 250 gZm ² )

A film composed of an oxygen-scavenging composite material containing 10% by mass of an ethylene-bier alcohol copolymer containing 15% by mass of (Na2S03) and 90% by mass of polyamide MXD6 (15 m) the graph Sorted not modified polyolefin-based adhesive laminate construction of (thickness 10 m) Z density 0. 915 g / cm ³ of linear low density polyethylene (LLDPE) film (thickness 25 / m) (innermost layer) A packaging material was produced.

Using the packaging material produced above, a 200ml 1-prick type liquid food container was prepared and filled with a vitamin C solution. Immediately after filling and at 23 ° C As a result of observing changes in the concentration of vitamin C in the container stored for 4 weeks, the concentration of vitamin C was 90% of the initial concentration.

(Example 2-2)

LDPE film used in Example 2-1 (outermost layer) No. Paper used in Example 2-1 Z Oxygen-scavenging property of the composition used in Example 2-1 containing 10% by mass of polyamide 6 A film made of a composite material (15 zm) A packaging material comprising a laminate of the modified polyolefin adhesive used in Example 2-1 / the LLDPE film (innermost layer) used in Example 1 was manufactured. Using this packaging material, a container was prepared and a vitamin C solution was filled in the same manner as in Example 2-1, and the change in the concentration of vitamin C in the container was observed. It was 90% of the concentration.

(Example 2-3)

LDPE film used in Example 2-1 (outermost layer) No. Composition containing 20% by mass of polyethylene terephthalate containing 10% by mass of sodium paper bisulfite and 80% by mass of polyamide 6 used in Example 2-1 Film (15 m) / modified polyolefin adhesive used in Example 2-1 Z density: 0.915 g / cm3, MI: 14 g / 10 min mL LDPE film (20 rn) (Innermost layer) packaging material was manufactured. Using this packaging material, a container was prepared and a vitamin C solution was filled in the same manner as in Example 2-1, and the change in the concentration of vitamin C in the container was observed. The concentration was 92%.

(Example 2-4)

LDPE film used in Example 2-1 (outermost layer) Z Paper used in Example 2-1 Z Film consisting of a composition containing 20% by mass of polyamide MXD6 in the composition used in Example 2-3 (15 ^ m) Z Modified polyolefin-based adhesive used in Example 2-1 / Example 3 A packaging material consisting of a laminate of the mLLDPE film (innermost layer) used in Step 1 was manufactured. Using this packaging material, a container was prepared and a vitamin C solution was filled in the same manner as in Example 2-1, and the change in the concentration of vitamin C in the container was observed. Was 93%.

(Comparative Example 2-1)

LDPE film used in Example 2-1 (outermost layer) Paper used in Example 2-1 Film made of ethylene-Biel alcohol copolymer containing 15% by mass of sodium sulfite (15 xm) Z Example 2 — A packaging material consisting of the LLDPE film (innermost layer) used in 1 was manufactured. Using this packaging material, a container was prepared and a vitamin C solution was filled in the same manner as in Example 2-1, and the change in the concentration of vitamin C in the container was observed. 80%.

(Comparative Example 2-2)

LDPE film used in Example 2-1 (outermost layer) / paper used in Example 2-1 / film consisting of polyethylene terephthalate (15 m) / mLLDPE film used in Example 2-3 (most An inner layer) was manufactured as a packaging material. Using this packaging material, a container was prepared and filled with Vimin C solution in the same manner as in Example 2-1, and the change in vitamin C concentration in the container was observed. The initial concentration was 70%.

As is clear from the above results, the container molded using the packaging material of the example is It can be seen that the oxygen barrier property is superior to the container molded using the packaging material of the comparative example, and the strength of the packaging material is improved. advantage

As embodied and evident from the above embodiment, the present invention has the following effects.

The container molded using the packaging material of the present invention has excellent oxygen barrier properties, despite being substantially composed of a laminate of paper and polyolefin.

The container molded using the packaging material of the present invention has excellent oxygen barrier properties even when the oxygen barrier layer is thin, and can prevent the quality of contents from being deteriorated due to oxygen permeation.

Since the oxygen barrier layer can be made thin, the weight of the packaging container can be reduced.

The packaging material of the present invention has excellent mechanical strength. Industrial applicability

The method for producing an oxygen-scavenging packaging material and the oxygen-scavenging packaging material of the present invention are used for packaging liquid foods such as milk, distillery, sake, shochu, mineral water and other beverages.

Claims

The scope of the claims

Ethylene-vinyl alcohol copolymer)

An oxygen scavenger is added to the carrier of the barrier resin to form an oxygen-scavenging dispersed resin.

Dispersing the oxygen-scavenging dispersing resin in a polyolefin or polyamide matrix resin to form an oxygen-scavenging composite material,

Forming a packaging material using the oxygen-scavenging composite material

And a method for producing an oxygen-scavenging packaging material.

2. An oxygen-scavenging dispersed resin is formed by blending an adhesive resin and an oxygen-scavenging agent compatible with polyolefin on a carrier of a barrier resin of ethylene-biel alcohol copolymer or polyethylene terephthalate,

Dispersing the oxygen-scavenging dispersion resin in a polyolefin matrix resin to form an oxygen-scavenging composite material;

Forming a packaging material using the oxygen-scavenging composite material

A method according to claim 1.

3. Ethylene-vinyl alcohol copolymer i

An oxygen scavenger is formed on the carrier of the barrier resin to form an oxygen-scavenging dispersed resin.

Dispersing the oxygen-scavenging dispersion resin in a polyamide matrix resin to form an oxygen-scavenging composite material,

The oxygen-scavenging composite material is directly laminated on a paper layer by extrusion lamination to form a packaging material composed of a paper laminate. A method according to claim 1.

4. Using the oxygen-scavenging composite material to form an opening device by injection molding to form a packaging material

A manufacturing method according to claim 2.

5. A packaging material formed from a laminate having a paper layer and a thermoplastic resin layer on both sides thereof, wherein an oxygen scavenger, an ethylene-vinyl alcohol copolymer or polyethylene terephthalate is provided inside the paper layer. An oxygen-scavenging packaging material having an oxygen-scavenging composite material layer in which oxygen-scavenging dispersed resin particles composed of an adhesive resin are dispersed in a polyolefin matrix.

6. The oxygen-scavenging packaging material according to claim 5, having an oxygen barrier layer between said paper layer and said oxygen-scavenging composite material layer.

7. A packaging material formed of a laminate having a paper layer and a thermoplastic resin layer on both sides thereof, wherein oxygen formed of an oxygen scavenger and an ethylene-vinyl alcohol copolymer or polyethylene terephthalate is provided inside the paper layer. An oxygen-scavenging packaging material having an oxygen-scavenging composite material layer in which scavenging dispersed resin particles are dispersed in a polyamide matrix.

8. The oxygen-scavenging packaging material according to claim 7, wherein the oxygen-scavenging agent is a sulfite.