Nitrile group-containing highly saturated copolymer rubber composition and cross-linked rubber

Patent metadata

Field	Value
Publication number	US-2016297955-A1
Application number	US-201415038547-A
Country	US
Kind code	A1
Filing date	Nov 26, 2014
Priority date	Nov 28, 2013
Publication date	Oct 13, 2016
Grant date	—

Abstract

A nitrile group-containing highly saturated copolymer rubber composition includes a nitrile group-containing highly saturated copolymer rubber (A) having α,β-ethylenically unsaturated nitrile monomer units and (meth)acrylic acid ester monomer units and having an iodine value of 120 or less and a polyether ester-based plasticizer (B) having structural unit made of three or more ether compounds which are successively bonded. A nitrile group-containing highly saturated copolymer rubber composition excellent in vulcanization speed and giving cross-linked rubber has excellent heat resistance and cold resistance.

First claim

1 . A nitrile group-containing highly saturated copolymer rubber composition comprising a nitrile group-containing highly saturated copolymer rubber (A) having α,β-ethylenically unsaturated nitrile monomer units and (meth)acrylic acid ester monomer units and having an iodine value of 120 or less, and a polyether ester-based plasticizer (B) having structural unit comprised of three or more ether compounds which are successively bonded.

2 . The nitrile group-containing highly saturated copolymer rubber composition according to claim 1 wherein the polyether ester-based plasticizer (B) has a molecular weight of 600 to 5000.

3 . The nitrile group-containing highly saturated copolymer rubber composition according to claim 1 wherein the polyether ester-based plasticizer (B) is a compound expressed by the following general formula (1):

where, in the above general formula (1), R 1 indicates, respectively independently, a hydrogen atom or C 1 to C 350 hydrocarbon group, R 2 indicates, respectively independently, a hydrogen atom or C 1 to C 350 hydrocarbon group, and “n” indicates an integer of 3 to 100.

4 . The nitrile group-containing highly saturated copolymer rubber composition according to claim 1 wherein the polyether ester-based plasticizer (B) has a viscosity of 15 to 200 mPa·s/25° C., a solidification point of 10 to −20° C., and an SP value of 7 to 11 (cal/cm 3 ) 1/2 .

5 . The nitrile group-containing highly saturated copolymer rubber composition according to claim 1 wherein a content of the polyether ester-based plasticizer (B) is 1 to 30 parts by weight with respect to 100 parts by weight of the highly saturated nitrile rubber (A).

6 . A cross-linkable rubber composition obtained by blending a cross-linking agent into the nitrile group-containing highly saturated copolymer rubber composition according to claim 1 .

7 . A cross-linked rubber obtained by cross-linking the cross-linkable rubber composition according to claim 6 .

Assignees

• Zeon Corp

Inventors

• Inoue Sayaka
• Nakashima Tomonori

Classifications

• C08L15/00 Primary

  Compositions of rubber derivatives (C08L11/00, C08L13/00 take precedence) · CPC title

• C08L13/00 Primary

  Compositions of rubbers containing carboxyl groups · CPC title

• C08L71/00

  Compositions of polyethers obtained by reactions forming an ether link in the main chain (of polyacetals C08L59/00; of epoxy resins C08L63/00; of polythioether-ethers C08L81/02; of polyether-sulfones C08L81/06); Compositions of derivatives of such polymers · CPC title

• C08K5/103

  with polyalcohols · CPC title