# US 7,608,341 B2 · Oxygen absorption resin composition

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- Number: US 7,608,341 B2
- Document ID: US7608341B2
- Status: Granted
- Kind: B2
- Application number: 11/442,998
- Filed: 2006-05-31
- Published: 2006-12-14
- Granted: 2009-10-27
- Earliest claimed: 2003-12-03
- Assignees: Kuraray Co., Ltd.
- Inventors: Yoshihisa Tsuji; Yasutaka Inubushi; Mie Kodani; Tatsuhiko Hayashibara; Tomoyuki Watanabe; Hideharu Iwasaki
- Web page: https://patentgrep.com/patent/US7608341B2

## CPC

- B32B 27/08: of synthetic resin
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/36: comprising polyesters
- C08K 3/10: Metal compounds
- C08L 23/04: Homopolymers or copolymers of ethene
- C08L 29/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- B32B 2307/7244: Oxygen barrier
- C08K 2201/008: Additives improving gas barrier properties
- C08L 9/00: Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L 11/00: Compositions of homopolymers or copolymers of chloroprene
- C08L 15/00: Compositions of rubber derivatives (C08L11/00, C08L13/00 take precedence)
- C08L 23/06: Polyethylene
- Y10T 428/1352: Polymer or resin containing [i.e., natural or synthetic]
- Y10T 428/31855: Of addition polymer from unsaturated monomers
- Y10T 428/31931: Polyene monomer-containing
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An oxygen absorption resin composition is provided that comprises a thermoplastic resin (A) having carbon-carbon double bonds substantially in its main chain and a transition metal salt (B). If necessary, the composition further comprises a gas barrier resin (C), a compatibilizer (D) and the like. The composition has excellent oxygen absorption properties, and when the composition is employed, generation of odorous substances derived from the decomposition of resins as a result of oxygen absorption can be suppressed.

## Claims

### Claim 1

An oxygen absorption resin composition comprising:
a thermoplastic resin (A) having carbon-carbon double bonds substantially in its main chain, wherein the thermoplastic resin (A) is represented by a formula (III):
wherein R7 and R8 are each independently a hydrogen atom, an alkyl group that may be substituted, an aryl group that may be substituted, an alkylaryl group that may be substituted, —COOR9, —OCOR10, a cyano group or a halogen atom, and R9 and R10 are each independently a hydrogen atom, or an alkyl group having 1 to 10 carbon atoms;
a transition metal salt (B), and
a gas barrier resin (C),
wherein the thermoplastic resin (A) satisfies the following inequality (1):
100×b/(a+b)≦X (1)
wherein a (mol/g) is an amount of carbon-carbon double bonds in its main chain, b (mol/g) is an amount of carbon-carbon double bonds in its side chain, and X is 10,
wherein the oxygen absorption amount of the thermoplastic resin (A) is at least 1.6 moles per 1 mol of carbon·carbon double bonds of the thermoplastic resin (A), and
wherein the gas barrier resin (C) is a polyvinyl alcohol resin having an oxygen transmission rate of 20 ml·20 μm(m2·day·atm) or less in 65% RH at 20° C.

### Claim 2 (depends on 1)

The oxygen absorption resin composition of claim 1, wherein the thermoplastic resin (A) satisfies the following inequality (1):
100×b/(a+b)≦X (1)
wherein a (mol/g) is an amount of the carbon-carbon double bonds in its main chain, and b (mol/g) is an amount of the carbon-carbon double bonds in its side chain, and X is 7.

### Claim 3 (depends on 1)

The oxygen absorption resin composition of claim 1, wherein the thermoplastic resin (A) is polyoctenylene.

### Claim 4 (depends on 1)

The oxygen absorption resin composition of claim 1, wherein the transition metal salt (B) is at least one metal salt selected from the group consisting of an iron salt, a nickel salt, a copper salt, a manganese salt and a cobalt salt.

### Claim 5 (depends on 1)

The oxygen absorption resin composition of claim 1, wherein the oxygen absorption rate is at least 0.01 ml/(g·day).

### Claim 6 (depends on 1)

The oxygen absorption resin composition of claim 1, wherein the gas barrier resin (C) is an ethylene-vinyl alcohol copolymer having an ethylene content of 5 to 60 mol % and a saponification degree of 90% or more.

### Claim 7 (depends on 1)

The oxygen absorption resin composition of claim 1, wherein the gas barrier resin (C) is contained in an amount of 70 to 99 wt % and the thermoplastic resin (A) is contained in an amount of 30 to 1 wt %, when the total weight of the thermoplastic resin (A) and the gas barrier resin (C) is determined to be 100 wt %.

### Claim 8 (depends on 1)

The oxygen absorption resin composition of claim 1, further comprising a compatibilizer (D).

### Claim 9 (depends on 8)

The oxygen absorption resin composition of claim 8, wherein the gas barrier resin (C) is contained in an amount of 70 to 98.9 wt %, the thermoplastic resin (A) is contained in an amount of 29.9 to 1 wt %, and the compatibilizer (D) is contained in an amount of 29 to 0.1 wt %, when the total weight of the thermoplastic resin (A), the gas barrier resin (C) and the compatibilizer (D) is determined to be 100 wt %.

### Claim 10 (depends on 1)

The oxygen absorption resin composition of claim 1, wherein particles of the thermoplastic resin (A) are dispersed in a matrix of the gas barrier resin (C).

### Claim 11 (depends on 1)

A molded product comprising the oxygen absorption resin composition of claim 1.

### Claim 12 (depends on 1)

A multilayered structure comprising a layer made of the oxygen absorption resin composition of claim 1.

### Claim 13 (depends on 1)

A multilayered container comprising a layer made of the oxygen absorption resin composition of claim 1.

### Claim 14 (depends on 1)

A multilayered container made of a multilayered film having a total layer thickness of 300 μm or less, wherein the multilayered film comprises a layer made of the oxygen absorption resin composition of claim 1.

### Claim 15 (depends on 1)

A multilayered container comprising a layer made of the oxygen absorption resin composition of claim 1 and a thermoplastic polyester layer.

### Claim 16 (depends on 1)

A cap having a cap body that is provided with a gasket made of the oxygen absorption resin composition of claim 1.