Oil-resistant rubber composition

• US 4,654,404 A
• Filed: 11/20/1985
• Issued: 03/31/1987
• Est. Priority Date: 11/21/1984
• Status: Expired due to Term

• Current Assignee: Nippon Zeon Co., Ltd.
• Original Assignee: Nippon Zeon Co., Ltd.
• Inventors: Nakagawa, Tsuyoshi, Watanabe, Noboru, Shimoda, Hideyoshi, Kubo, Yoichiro
• Primary Examiner(s): Lieberman, Allan M.
• Application Number:
  US06/800,160
• Time in Patent Office: 496 Days
• Field of Search: 524/205, 524/209, 525/315
• US Class Current: 525/315
• CPC Class Codes: C08L 15/005 Hydrogenated nitrile rubber
• CPC Class Codes: C08L 2666/08 Homopolymers or copolymers according to C08L7/00 - C08L21/00; Derivatives thereof
• CPC Class Codes: C08L 9/02 Copolymers with acrylonitrile

Abstract

A heat-resistant and oil-resistant rubber composition comprising a nitrile group-containing rubber having an iodine value of not more than 120 and a nitrile group-containing liquid polymer having an iodine value of not more than 120.

Claims

1. A heat-resistant and oil-resistant rubber composition comprising:

(1) 99 to 40% by weight of a nitrile group-containing rubber having an iodine value of not more than 120, a Mooney viscosity of at least 20 and containing 5 to 60% by weight of monomer units containing a nitrile group, and

(2) 1 to 60% by weight of a nitrile group-containing liquid polymer having an iodine value of not more than 120, a number average molecular weight of 500 to 10,000 and containing 5 to 70% by weight of nitrile group containing monomer units.

2. The rubber composition of claim 1 wherein the nitrile group-containing liquid polymer contains 10 to 50% by weight of nitrile group-containing monomer units.

3. The rubber composition of claim 1 wherein the nitrile group-containing liquid polymer has an iodine value of 0 to 100.

4. The rubber composition of claim 1 wherein the nitrile group-containing rubber has an iodine value of 0 to 85.

5. The rubber composition of claim 1 wherein the Mooney viscosity of the nitrile group-containing rubber is at least 40.

6. The rubber composition of claim 1 wherein the number average molecular weight of the nitrile group-containing liquid polymer is 700 to 8,000.

7. The rubber composition of claim 1 wherein the rubber is at least one rubber selected from rubbers obtained by hydrogenating the conjugated diene unit portion of unsaturated nitrile-conjugated diene copolymers, unsaturated nitrile/conjugated diene/ethylenically unsaturated monomer copolymers, rubbers obtained by hydrogenating the conjugated diene unit portion of unsaturated nitrile/conjugated diene/ethylenically unsaturated monomer copolymers, and unsaturated nitrile/ethylenically unsaturated monomer copolymers.

8. The rubber composition of claim 1 wherein the liquid polymer is at least one polymer selected from polymers obtained by hydrogenating the conjugated diene unit portion of unsaturated nitrile/conjugated diene copolymers, unsaturated nitrile/conjugated diene/ethylenically unsaturated monomer copolymers, polymers obtained by hydrogenating the conjugated diene unit portion of unsaturated nitrile/conjugated diene/ethylenically unsaturated monomer copolymers, and unsaturated nitrile/ethylenically unsaturated monomer copolymers.