# US 2017/0253684 A1 · Highly saturated nitrile rubber composition and cross-linked rubber

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- Number: US 2017/0253684 A1
- Document ID: US20170253684A1
- Status: Published application
- Kind: A1
- Application number: 15/508,822
- Filed: 2015-09-04
- Published: 2017-09-07
- Earliest claimed: 2014-09-05
- Assignees: Zeon Corporation
- Applicants: Zeon Corporation
- Inventors: Yoshio FUKUMINE
- Web page: https://patentgrep.com/patent/US20170253684A1

## CPC

- C08F 236/12: with nitriles
- C08F 236/06: Butadiene
- C08K 5/14: Peroxides
- C08L 13/00: Compositions of rubbers containing carboxyl groups
- C08L 15/005: {Hydrogenated nitrile rubber}
- C08L 33/18: Homopolymers or copolymers of nitriles
- C08L 67/00: Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain (of polyester-amides C08L77/12; of polyester-imides C08L79/08); Compositions of derivatives of such polymers
- C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- 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)

## Abstract

A highly saturated nitrile rubber composition obtained by mixing 7 to 40 wt % of a carboxyl group-containing highly saturated nitrile rubber (A1) containing 15 to 60 wt % of α,β-ethylenically unsaturated nitrile monomer units and 1 to 60 wt % of α,β-ethylenically unsaturated dicarboxylic acid monoester monomer units and having an iodine value of 120 or less, 10 to 78 wt % of a highly saturated nitrile rubber (A2) containing α,β-ethylenically unsaturated nitrile monomer units in 15 to 60 wt %, having a content of α,β-ethylenically unsaturated dicarboxylic acid monoester monomer units of 0.9 wt % or less, and having an iodine value of 120 or less, and 15 to 50 wt % of a polyester resin (B) at a temperature of a melting point of the polyester resin (B) or more is provided.

## Claims

### Claim 1

A highly saturated nitrile rubber composition comprising
a carboxyl group-containing highly saturated nitrile rubber (A1) containing 15 to 60 wt % of α,β-ethylenically unsaturated nitrile monomer units and 1 to 60 wt % of α,β-ethylenically unsaturated dicarboxylic acid monoester monomer units and having an iodine value of 120 or less,
a highly saturated nitrile rubber (A2) containing α,β-ethylenically unsaturated nitrile monomer units in 15 to 60 wt %, having a content of α,β-ethylenically unsaturated dicarboxylic acid monoester monomer units of 0.9 wt % or less, and having an iodine value of 120 or less, and
a polyester resin (B),
wherein the highly saturated nitrile rubber composition contains 7 to 40 wt % of the carboxyl group-containing highly saturated nitrile rubber (A1), 10 to 78 wt % of the highly saturated nitrile rubber (A2), and 15 to 50 wt % of the polyester resin (B) when a total of the carboxyl group-containing highly saturated nitrile rubber (A1), the highly saturated nitrile rubber (A2), and the polyester resin (B) is made 100 wt %, and
the highly saturated nitrile rubber composition is obtained by mixing the carboxyl group-containing highly saturated nitrile rubber (A1), the highly saturated nitrile rubber (A2), and the polyester resin (B) at a temperature of a melting point of the polyester resin (B) or more.

### Claim 2 (depends on 1)

The highly saturated nitrile rubber composition according to claim 1 wherein the polyester resin (B) is polyethylene terephthalate, polybutylene terephthalate, and/or polyethylene naphthalate.

### Claim 3 (depends on 1)

A cross-linkable nitrile rubber composition obtained by blending a cross-linking agent (C) into the highly saturated nitrile rubber composition according to claim 1.

### Claim 4 (depends on 3)

A cross-linked rubber obtained by cross-linking the cross-linkable nitrile rubber composition according to claim 3.

### Claim 5

A cross-linked rubber obtained by cross-linking a cross-linkable nitrile rubber composition, the cross-linkable nitrile rubber composition containing:
a carboxyl group-containing highly saturated nitrile rubber (A1) containing 15 to 60 wt % of α,β-ethylenically unsaturated nitrile monomer units and 1 to 60 wt % of α,β-ethylenically unsaturated dicarboxylic acid monoester monomer units and having an iodine value of 120 or less;
a highly saturated nitrile rubber (A2) containing α,β-ethylenically unsaturated nitrile monomer units in 15 to 60 wt %, having a content of α,β-ethylenically unsaturated dicarboxylic acid monoester monomer units of 0.9 wt % or less, and having an iodine value of 120 or less;
a polyester resin (B); and
a cross-linking agent (C),
wherein
the cross-linked rubber contains 7 to 40 wt % of the carboxyl group-containing highly saturated nitrile rubber (A1), 10 to 78 wt % of the highly saturated nitrile rubber (A2), and 15 to 50 wt % of the polyester resin (B) when a total of the carboxyl group-containing highly saturated nitrile rubber (A1), the highly saturated nitrile rubber (A2), and the polyester resin (B) is made 100 wt %, and
the cross-linked rubber has 100% tensile stress of 10 MPa or more.

### Claim 6 (depends on 5)

The cross-linked rubber according to claim 5 wherein the polyester resin (B) is polyethylene terephthalate, polybutylene terephthalate, and/or polyethylene naphthalate.

### Claim 7 (depends on 2)

A cross-linkable nitrile rubber composition obtained by blending a cross-linking agent (C) into the highly saturated nitrile rubber composition according to claim 2.

### Claim 8 (depends on 7)

A cross-linked rubber obtained by cross-linking the cross-linkable nitrile rubber composition according to claim 7.