Hydrogenated nitrile rubber composition

• US 20050245666A1
• Filed: 12/19/2003
• Published: 11/03/2005
• Est. Priority Date: 01/17/2003
• Status: Active Grant

• Current Assignee: Eagle Industry Company Limited
• Original Assignee: NOK Corporation
• Inventors: Yamanaka, Takuya
• Granted Patent: US 7,094,825 B2
• Time in Patent Office: Days
• US Class Current: 524/495
• CPC Class Codes: C08C 19/02 Hydrogenation
• CPC Class Codes: C08K 3/04 Carbon
• CPC Class Codes: C08K 5/0025 Crosslinking or vulcanising agents; including accelerators
• CPC Class Codes: C08K 5/14 Peroxides
• CPC Class Codes: C08K 7/06 Elements
• CPC Class Codes: C08L 15/005 Hydrogenated nitrile rubber
• CPC Class Codes: C09K 3/10 Materials in mouldable or extrudable form for sealing or packing joints or covers filling pastes C09D5/34

Abstract

A hydrogenated nitrile rubber composition, which comprises 100 parts by weight of hydrogenated nitrile rubber with a bound acrylonitrile content of not less than 30%, a polymer Mooney viscosity ML₁₊₄(100° C.)(according to JIS K6395) of not more than 80 (median value) and an iodine number of not more than 28 (median value), and 65 to 200 parts by weight of carbon fibers is provided as a hydrogenated nitrile rubber composition containing carbon fibers as filled at a high density, which can overcome inconveniences as to kneadability and moldability and improve the wear resistance, and thus can be used as a suitable molding material for sealing members.

Claims

1. A hydrogenated nitrile rubber composition which comprises 100 parts by weight of hydrogenated nitrile rubber with a bound acrylonitrile content of at least 30%, a Mooney viscosity ML₁₊₄ (100°

C.) of 80 or less (median value) and an iodine number of 28 or less (median value) and 65 to 200 parts by weight of carbon fibers.

2. A hydrogenated nitrile rubber composition according to claim 1, which further contains 100 or less parts by weight of carbon black.

3. A hydrogenated nitrile rubber composition according to claim 1, which further contains 60 or less parts by weight of graphite.

4. A hydrogenated nitrile rubber composition according to claim 1, which further contains 30 to 100 parts by weight of carbon black and 5 to 60parts by weight of graphite.

5. A hydrogenated nitrile rubber composition according to claim 2, wherein a sum total of fillers in the composition, including carbon fibers, is 90 to 250 parts by weight.

6. A molding material for sealing members which comprises the hydrogenated nitrile rubber composition of claim 1.

7. A molding material for sealing members which comprises the hydrogenated nitrile rubber composition according of claim 4.

8. A hydrogenated nitrile rubber composition according to claim 3, wherein a sum total of fillers in the composition, including carbon fibers, is 90 to 250 parts by weight.

9. A hydrogenated nitrile rubber composition according to claim 4, wherein a sum total of fillers in the composition, including carbon fibers, is 90 to 250 parts by weight.