US4156673A
Expired / Lapsed
US
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Hydrogenated star-shaped polymer
Assignee: Shell USA Inc
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Filing: 1978-07-21
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Granted: 1979-05-29
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Expires: 1998-07-21
Abstract
Abstract A viscosity index-improver for lubricating oil compositions is disclosed. This viscosity index improver is a hydrogenated star-shaped polymer comprising a poly(poly-alkenyl coupling agent) nucleus and at least four polymeric arms linked to the nucleus wherein the arms are hydrogenated homopolymers and copolymers of conjugated dienes, hydrogenated copolymers of conjugated dienes and monoalkenyl arenes, or mixtures thereof.
Inventors
- 👤 Rudolf J. A. Eckert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:52
CPC Classifications
C; C10; C10M; C10M143/00; C10M143/14; C08; C08G; C08G81/00; C08G81/02; C08G81/021; C08G81/022; C08L; C08L53/00; C08L53/02; C08L53/025; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/16; C10L1/1625; C10L1/1633; C10L1/1658; C10M143/12; C10M2203/00; C10M2203/10; C10M2203/108; C10M2205/00; C10M2205/06; C10M2207/00; C10M2207/28; C10M2207/282; C10M2207/34; C10M2209/00; C10M2209/02; C10M2209/04; C10M2209/06; C10M2209/062; C10M2209/08; C10M2209/084; C10M2209/10; C10M2211/00; C10M2211/06; C10M2213/00; C10M2213/02; C10M2213/06; C10M2213/062; C10M2215/00; C10M2215/086; C10M2215/24; C10M2215/28; C10M2217/00; C10M2217/02; C10M2217/028; C10M2217/04; C10M2217/06; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/045; C10N; C10N2010/00; C10N2010/04; C10N2070/00; C10N2070/02
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
56 words
A lubricating oil composition comprising a major proportion of a lubricating oil and between 0.15 and 10.0% by weight of a hydrogenated star-shaped polymer wherein said polymer comprises a poly(poly-alkenyl coupling agent) nucleus and at least seven polymeric arms linked to said nucleus wherein said polymeric arms are hydrogenated copolymers of conjugated dienes and monoalkenyl arenes.
Claim 2
Dependent Claim
56 words
A lubricating oil composition comprising a major proportion of a lubricating oil and between 0.15 and 10.0% by weight of a hydrogenated star-shaped polymer wherein said polymer comprises a poly(poly-alkenyl coupling agent) nucleus and at least seven polymeric arms linked to said nucleus wherein said polymeric arms are hydrogenated copolymers of conjugated dienes and monoalkenyl arenes.
Claim 3
Dependent Claim
18 words
A composition according to claim 1 wherein the number of polymeric arms is between about 7 and 15.
Claim 4
Dependent Claim
16 words
A composition according to claim 1 wherein the polyalkenyl coupling agent is a poly-vinyl aromatic compound.
Claim 5
Dependent Claim
14 words
A composition according to claim 1 wherein the polyalkenyl coupling agent is divinyl benzene.
Claim 6
Dependent Claim
14 words
A composition according to claim 1 wherein the nucleus is a poly(divinyl benzene/monoalkenyl arene).
Claim 7
Dependent Claim
23 words
A composition according to claim 1 wherein the number average molecular weight of each polymeric arm is between about 5,000 and about 150,000.
Claim 8
Dependent Claim
23 words
A composition according to claim 2 wherein the number average molecular weight of each polymeric arm is between about 5,000 and about 150,000.
Claim 9
Dependent Claim
23 words
A composition according to claim 1 wherein the peak molecular weight of the hydrogenated star-shaped polymer is between about 250,000 and about 1,250,000.
Claim 10
Dependent Claim
21 words
A composition according to claim 8 wherein the peak molecular weight of the hydrogenated star-shaped polymer is greater than about 500,000.
Claim 11
Dependent Claim
19 words
A composition according to claim 9 wherein the number of polymeric arms is between about 7 and about 15.
Claim 12
Dependent Claim
14 words
A composition according to claim 4 wherein each polymeric arm is a poly(styrene/butadiene) copolymer.
Claim 13
Dependent Claim
23 words
A composition according to claim 11 wherein the structure of the polymeric arm is a random copolymer, block copolymer, or tapered block copolymer.
Claim 14
Dependent Claim
19 words
A composition according to claim 11 wherein the number of polymeric arms is between about 7 and about 15.
Claim 15
Dependent Claim
23 words
A composition according to claim 11 wherein the number average molecular weight of each polymeric arm is between about 5,000 and about 150,000.
Claim 16
Dependent Claim
23 words
A composition according to claim 11 wherein the peak molecular weight of the hydrogenated star-shaped polymer is between about 250,000 and about 1,250,000.
Claim 17
Dependent Claim
20 words
A composition according to claim 11 wherein the hydrogenated polymer contains less than about 70% of its original olefinic unsaturation.
Claim 18
Dependent Claim
16 words
A composition according to claim 16 wherein less than 10% of the aromatic unsaturation is hydrogenated.
Claim 19
Dependent Claim
23 words
A composition according to claim 11 wherein the weight percentage of styrene in each polymeric arm is between about 3% and about 50%.
Claim 20
Dependent Claim
14 words
A composition according to claim 4 wherein each polymeric arm is a poly(styrene/isoprene) copolymer.
Claim 21
Dependent Claim
23 words
A composition according to claim 19 wherein the structure of the polymeric arm is a random copolymer, block copolymer, or tapered block copolymer.
Claim 22
Dependent Claim
19 words
A composition according to claim 19 wherein the number of polymeric arms is between about 7 and about 15.
Claim 23
Dependent Claim
23 words
A composition according to claim 19 wherein the number average molecular weight of each polymeric arm is between about 5,000 and about 150,000.
Claim 24
Dependent Claim
23 words
A composition according to claim 19 wherein the peak molecular weight of the hydrogenated star-shaped polymer is between about 250,000 and about 1,250,000.
Claim 25
Dependent Claim
20 words
A composition according to claim 19 wherein the hydrogenated polymer contains less than about 70% of its original olefinic unsaturation.
Claim 26
Dependent Claim
16 words
A composition according to claim 24 wherein less than 10% of the aromatic unsaturation is hydrogenated.
Claim 27
Dependent Claim
23 words
A composition according to claim 19 wherein the weight percentage of styrene in each polymeric arm is between about 3% and about 50%.
Claim 28
Dependent Claim
56 words
An oil concentrate comprising a major proportion of a lubricating oil and between about 10% and 30% by weight of a viscosity index improver comprising a hydrogenated star-shaped polymer having a poly(divinylbenzene) nucleus and at least seven polymeric arms linked to said nucleus wherein said polymeric arms are hydrogenated copolymers of monoalkenyl arenes and conjugated dienes.
Claim 29
Dependent Claim
56 words
An oil concentrate comprising a major proportion of a lubricating oil and between about 10% and 30% by weight of a viscosity index improver comprising a hydrogenated star-shaped polymer having a poly(divinylbenzene) nucleus and at least seven polymeric arms linked to said nucleus wherein said polymeric arms are hydrogenated copolymers of monoalkenyl arenes and conjugated dienes.
Claim 30
Dependent Claim
19 words
An oil concentrate according to claim 27 wherein said polymeric arms are selectively hydrogenated copolymers of styrene and isoprene.
Claim 31
Dependent Claim
14 words
An oil concentrate according to claim 28 wherein said copolymer is a block copolymer.
Claim 32
Dependent Claim
22 words
A composition according to claim 1 wherein the structure of the polymeric arm is a random copolymer, block copolymer, or tapered copolymer.
Claim 33
Dependent Claim
29 words
A composition according to claim 30 wherein the structure of the polymeric arm is a block copolymer and wherein the monoalkenyl arene block is directly attached to the nucleus.
Claim 34
Dependent Claim
42 words
A composition according to claim 30 wherein the structure of the polymeric arm is a block copolymer, the hydrogenated conjugated diene block is directly attached to the nucleus, and the molecular weight of the monoalkenyl arene block is less than about 9,000.
Claim 35
Dependent Claim
42 words
A composition according to claim 30 wherein the structure of the polymeric arm is a block copolymer, the hydrogenated conjugated diene block is directly attached to the nucleus, and the molecular weight of the monoalkenyl arene block is between 4,000 and 5,000.
Claim 36
Dependent Claim
7 words
A non-gelling composition according to claim 1.
Claim 37
Dependent Claim
17 words
A composition according to claim 1 wherein the structure of the polymeric arm is a random copolymer.
Claim 38
Dependent Claim
17 words
A composition according to claim 1 wherein the structure of the polymeric arm is a tapered copolymer.
Claim 39
Dependent Claim
17 words
A composition according to claim 17 wherein the structure of the polymeric arm is a random copolymer.
Claim 40
Dependent Claim
17 words
A composition according to claim 25 wherein the structure of the polymeric arm is a tapered copolymer.
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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) | 1982-05-28 | 1982-11-27 | 1983-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-28 | 1986-11-27 | 1987-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-28 | 1990-11-27 | 1991-05-29 | $7700.00 | Window Closed / Lapsed |