HYDROGENATED NBR COMPOSITION

• US 20090258980A1
• Filed: 04/14/2008
• Published: 10/15/2009
• Est. Priority Date: 04/14/2008
• Status: Active Grant

• Current Assignee: NOK Corporation
• Original Assignee: NOK Corporation
• Inventors: Moritani, Yoichi
• Granted Patent: US 7,847,008 B2
• Time in Patent Office: Days
• US Class Current: 524/284
• CPC Class Codes: C08K 5/0025 Crosslinking or vulcanising agents; including accelerators
• CPC Class Codes: C08K 5/14 Peroxides
• CPC Class Codes: C08L 15/005 Hydrogenated nitrile rubber

Abstract

A hydrogenated NBR composition, which comprises 100 parts by weight of a blend of a hydrogenated NBR having an acrylonitrile content of 25-44% by weight and an iodine number of 32-65, with such an amount of an NBR as to make the iodine number of the blend of 40-160, 2-23 parts by weight of an ester-based plasticizer, and 0.5-10 parts by weight of an organic peroxide, preferably which further contains 0.5-10 parts by weight of a polyfunctional, unsaturated compound, has a distinguished cost performance because of blending an expensive hydrogenated NBR with a cheap NBR, can give cross-linked products having a distinguished oil resistance (resistance to such oil as No. 3 oil and other general-purpose, commercially available engine oil, etc.) and a distinguished fuel oil resistance (resistance to such fuel oil as fuel oil C, and other general-purpose, commercially available gasoline, etc.) and thus can serve as suitable molding materials for intake manifold gaskets of automobile engine or automobile sealing parts, particularly sealing parts around engines and transmission systems.

Claims

1. A hydrogenated NBR composition, which comprises 100 parts by weight of a blend of a hydrogenated NBR having an acrylonitrile content of 25-44% by weight and an iodine number of 32-65, with such an amount of an NBR as to make the iodine number of the blend of 40-160, 2-23 parts by weight of an ester-based plasticizer, 0.5-10 parts by weight of an organic peroxide, and 0.5-10 parts by weight of a polyfunctional unsaturated compound.

2. A hydrogenated NBR composition according to claim 1, wherein the blend comprises 95-55% by weight of hydrogenated NBR and 5-45% by weight of NBR.

3. A hydrogenated NBR composition according to claim 2, wherein the blend comprises 85-65% by weight of hydrogenated NBR and 15-35% by weight of NBR.

4. A hydrogenated NBR composition according to claim 3, wherein the blend comprises 85-75% by weight of hydrogenated NBR and 15-25% by weight of NBR.

5. A hydrogenated NBR composition according to claim 1, wherein the blend comprises a hydrogenated NBR having an iodine number of 32-65 with such an amount of NBR as to make the iodine number of the blend of 50-140.

6. A hydrogenated NBR composition according to claim 5, wherein the blend comprises a hydrogenated NBR having an iodine number of 32-65 with such an amount of NBR to make the iodine number of the blend of 70-110.

7. A hydrogenated NBR composition according to claim 1, wherein 20-150 parts by weight of carbon black, white carbon or both thereof is further contained.

8. A hydrogenated NBR composition according to claim 7, wherein a silane coupling agent is further contained together with the white carbon.

9. A hydrogenated NBR composition according to claim 1, for use as molding materials for intake manifold gaskets of engines.

10. An intake manifold gasket obtained by cross-linking molding of a hydrogenated NBR composition according to claim 9.