Claims
- 1. An oil-resistant rubber composition comprising (A) 90 to 10 parts by weight of an unsaturated nitrile-conjugated diene rubber having a .DELTA.Tg of 58.degree. C. or more and an average bound ntirile content of 15 to 50% by weight, and (B) 10 to 90 parts by weight of at least one rubber selected from the group consisting of an ethylene-propylene copolymer rubber, a natural rubber and a polyisoprene.
- 2. The oil-resistant rubber composition according to claim 1, wherein the unsaturated nitrile-conjugated diene rubber (A) is a copolymer of acrylonitrile or methacrylonitrile and butadiene or isoprene.
- 3. The oil-resistant rubber composition according to claim 1, wherein the .DELTA.Tg ranges from 60.degree. to 90.degree. C.
- 4. The oil-resistant rubber composition according to claim 1, wherein the unsaturated nitrile-conjugated diene rubber (A) contains components having a Tg of -73.degree. C. or less in an integrated amount of existence probability of at least 5%.
- 5. The oil-resistant rubber composition according to claim 1, wherein the (B) component is an ethylene-propylene copolymer rubber.
- 6. The oil-resistant rubber composition according to claim 5, wherein the ethylene-propylene copolymer rubber is an ethylene-propylene-non-conjugated diene in which the non-conjugated diene is at least one member selected from ethylidenenorbornene, cyclopentadiene, 1,4-hexadiene, methylenenorbornene and 4,7,8,9-tetrahydroindene.
- 7. The oil-resistant rubber composition according to claim 6, wherein said ethylene-propylene copolymer rubber is ethylene-propylene-ethylidene norbornene copolymer rubber.
- 8. The oil-resistant rubber composition according to claim 1, wherein the average bound acrylonitrile content of the unsaturated nitrile-conjugated diene rubber (A) is 20 to 50% by weight.
Priority Claims (1)
Number |
Date |
Country |
Kind |
59-173772 |
Aug 1984 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 031,200, filed on Mar. 27, 1987, now abandoned, which is a continuation of application Ser. No. 763,607, filed on Aug. 8, 1985, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3646168 |
Barrett |
Feb 1972 |
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Continuations (2)
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Number |
Date |
Country |
Parent |
31200 |
Mar 1987 |
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Parent |
763607 |
Aug 1985 |
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