US4421884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil-resistant rubber composition
Assignee: Zeon Corp
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Filing: 1982-08-04
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Granted: 1983-12-20
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Expires: 2002-08-04
Abstract
Abstract An oil-resistant rubber composition comprising 98 to 50 parts by weight of (1) a partially hydrogenated unsaturated nitrile/conjugated diene copolymer rubber in which at least 50% of units derived from the conjugated diene are hydrogenated, and 2 to 50 parts by weight of (2) a liquid copolymer having a number average molecular weight of 500 to 10,000 obtained by copolymerizing 10 to 80% by weight of a conjugated diene, 10 to 70% by weight of an unsaturated nitrile and 0 to 20% by weight of a vinyl monomer copolymerizable with these monomers, the total amount of the components (1) and (2) being 100 parts by weight.
Inventors
- 👤 Motofumi Oyama
- 👤 Kinro Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:21
CPC Classifications
C; C08; C08F; C08F236/00; C08F236/02; C08F236/04; C08F236/12; C08L; C08L15/00; C08L15/005; C08L9/00; C08L9/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
106 words
An oil-resistant rubber composition comprising 98 to 50 parts by weight of (1) a partially hydrogenated unsaturated nitrile/conjugated diene copolymer rubber in which at least 50% of units derived from the conjugated diene are hydrogenated, and 2 to 50 parts by weight of (2) a liquid copolymer having a number average molecular weight of 500 to 10,000 obtained by copolymerizing 10 to 80% by weight of a conjugated diene, 10 to 70% by weight of an unsaturated nitrile and 0 to 20% by weight of a vinyl monomer copolymerizable with these monomers, the total amount of the components (1) and (2) being 100 parts by weight.
Claim 2
Dependent Claim
106 words
An oil-resistant rubber composition comprising 98 to 50 parts by weight of (1) a partially hydrogenated unsaturated nitrile/conjugated diene copolymer rubber in which at least 50% of units derived from the conjugated diene are hydrogenated, and 2 to 50 parts by weight of (2) a liquid copolymer having a number average molecular weight of 500 to 10,000 obtained by copolymerizing 10 to 80% by weight of a conjugated diene, 10 to 70% by weight of an unsaturated nitrile and 0 to 20% by weight of a vinyl monomer copolymerizable with these monomers, the total amount of the components (1) and (2) being 100 parts by weight.
Claim 3
Dependent Claim
22 words
The composition of claim 1 wherein the amount of bound nitrile in the copolymer rubber (1) is 10 to 60% by weight.
Claim 4
Dependent Claim
21 words
The composition of claim 1 or 2 wherein the degree of hydrogenation of the copolymer rubber (1) is at least 70%.
Claim 5
Dependent Claim
20 words
The composition of claim 1 wherein the liquid copolymer (2) has a number average molecular weight of 1,000 to 5,000.
References Cited (Backward Citations)
JPS5094063A
Cited
US4136077A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |