US4085055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grafted copolymers and their use as additives for lubricating oils
Assignee: Rhone Poulenc Industries SA
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Filing: 1975-12-03
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Granted: 1978-04-18
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Expires: 1995-12-03
Abstract
Abstract Graft copolymer formed by reacting at least one polymerizable vinyl compound in monomeric or polymerized form, with a hydrogenated polymer or copolymer selected from the hydrogenated homopolymers of conjugated dienes of 4-6 carbon atoms, the hydrogenated copolymers of at least 2 conjugated dienes and the hydrogenated copolymers of styrene and conjugated dienes of 4-6 carbon atoms, said hydrogenated polymer or copolymer having an average molecular weight ranging from 10.000 to 300.000 and a residual olefinic unsaturation lower than 15%.
Inventors
- 👤 Jean-Pierre Durand
- 👤 Patrick Gateau
- 👤 Francois Dawans
- 👤 Bernard Chauvel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:08
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02; C10; C10M; C10M143/00; C10M143/10; C10M143/12; C10M2209/00; C10M2209/02; C10M2209/04; C10M2209/06; C10M2209/062; C10M2209/08; C10M2209/082; C10M2209/084; C10M2209/10; C10M2217/00; C10M2217/02; C10M2217/022; C10M2217/023; C10M2217/024; C10M2217/028; C10M2217/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
133 words
A graft copolymer of: a. a substrate consisting essentially of a hydrogenated polymer or copolymer selected from the group consisting of (a) homopolymers of conjugated dienes having from 4 to 6 carbon atoms, (b) copolymers of at least two conjugated dienes having from 4 to 6 carbon atoms, (c) and copolymers of conjugated dienes having from 4 to 6 carbon atoms with styrene, said hydrogenated polymer or copolymer having after hydrogenation a residual olefinic unsaturation of from 0 to 5% of the units contained therein, a weight average molecular weight from 30,000 to 100,000 and a distribution of the molecular weights defined by a ratio M w /M n lower than 2, and b. graft polymerized chains of at least one vinyl compound selected from the group consisting of N-vinylpyrrolidone, N-vinylimidazole and vinylpyridine.
Claim 2
Dependent Claim
133 words
A graft copolymer of: a. a substrate consisting essentially of a hydrogenated polymer or copolymer selected from the group consisting of (a) homopolymers of conjugated dienes having from 4 to 6 carbon atoms, (b) copolymers of at least two conjugated dienes having from 4 to 6 carbon atoms, (c) and copolymers of conjugated dienes having from 4 to 6 carbon atoms with styrene, said hydrogenated polymer or copolymer having after hydrogenation a residual olefinic unsaturation of from 0 to 5% of the units contained therein, a weight average molecular weight from 30,000 to 100,000 and a distribution of the molecular weights defined by a ratio M w /M n lower than 2, and b. graft polymerized chains of at least one vinyl compound selected from the group consisting of N-vinylpyrrolidone, N-vinylimidazole and vinylpyridine.
Claim 3
Dependent Claim
27 words
A graft copolymer according to claim 1, in which said hydrogenated polymer is obtained from a polymer of 1,3-butadiene containing from 25 to 80% of 1,2 units.
Claim 4
Dependent Claim
33 words
A graft copolymer according to claim 1, in which said hydrogenated copolymer is obtained from a copolymer containing from 10 to 90% of butadiene units and from 10 to 90% of isoprene units.
Claim 5
Dependent Claim
46 words
A graft copolymer according to claim 1, in which said hydrogenated copolymer is obtained from a copolymer containing from 20 to 80% of units derivating from at least one conjugated diene having from 4 to 6 carbon atoms and from 20 to 80% of styrene units.
Claim 6
Dependent Claim
17 words
A graft copolymer according to claim 1, in which said at least one vinyl compound comprises N-vinylimidazole.
Claim 7
Dependent Claim
26 words
A grafted copolymer according to claim 1, in which the proportion of the graft polymerized chain of vinyl compound is from 1 to 40% by weight.
Claim 8
Dependent Claim
26 words
A graft copolymer according to claim 1, in which the proportion of the graft polymerized chain of vinyl compound is from 1 to 10% by weight.
Claim 9
Dependent Claim
16 words
A graft copolymer according to claim 1 wherein said at least one vinyl compound comprises N-vinylpyrrolidone.
Claim 10
Dependent Claim
40 words
A lubricating composition comprising a major proportion of lubricating oil and a proportion of at least one graft copolymer according to claim 1, which is sufficient to improve both the viscosity index and the dispersing power of said lubricating oil.
Claim 11
Dependent Claim
20 words
A composition according to claim 9, in which the proportion of graft copolymer is from 0.1 to 10% by weight.
Claim 12
Dependent Claim
20 words
A composition according to claim 9, in which the proportion of graft copolymer is from 0.5 to 5% by weight.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |