US4849481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Star shaped asymmetric block copolymer of monoalkenyl aromatic hydrocarbon and conjugated diene
Assignee: Shell USA Inc
•
Filing: 1987-07-10
•
Granted: 1989-07-18
•
Expires: 2007-07-10
Abstract
Abstract A star-shaped polymer useful as a polymeric VI improver comprising at least one arm which is a block copolymer containing a conjugated diolefin block and a monoalkenyl aromatic hydrocarbon block and a plurality of arms which are either a homopolymer of a conjugated diolefin or a copolymer of two or more conjugated diolefins. Oil compositions comprising star-shaped VI improvers of this type exhibit relatively low HTHSR viscosities, and hence, improved fuel efficiencies when used in automative applications. Oil compositions comprising star-shaped VI improvers of this type also exhibit improved low temperature pumpability.
Inventors
- 👤 Robert B. Rhodes
- 👤 Arthur R. Bean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:41
CPC Classifications
C; C10; C10M; C10M143/00; C10M143/12; C08; C08F; C08F297/00; C08F297/02; C08F297/04; C08F297/046; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/16; C10L1/1625; C10L1/1633; C10L1/1666; C10M143/10; C10M2205/00; C10M2205/04; C10M2205/06
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
148 words
A selectively hydrogenated star-shaped polymer comprising at least one arm of a block copolymer containing a single monoalkenyl aromatic hydrocarbon block and a single block having conjugated diene monomer units and a plurality of arms of a conjugated diene homopolymer or copolymer and a poly(polyalkenyl coupling agent) nucleus, said polymer containing from about 6 to about 13 total arms as determined by (GPC) on a styrene scale and one block copolymer arm, on average, for from about 6 to about 8 conjugated diolefin homopolymer or copolymer arms, the molecular weight of the monoalkenyl aromatic hydrocarbon block being from about 0.65 to about 7.5 times the molecular weight of the conjugated diene block in said block copolymer and the molecular weight of the conjugated diene block of the block copolymer being from about 0.8 to about 1.2 times the molecular weight of the conjugated diene homopolymer or copolymer blocks.
Claim 2
Dependent Claim
148 words
A selectively hydrogenated star-shaped polymer comprising at least one arm of a block copolymer containing a single monoalkenyl aromatic hydrocarbon block and a single block having conjugated diene monomer units and a plurality of arms of a conjugated diene homopolymer or copolymer and a poly(polyalkenyl coupling agent) nucleus, said polymer containing from about 6 to about 13 total arms as determined by (GPC) on a styrene scale and one block copolymer arm, on average, for from about 6 to about 8 conjugated diolefin homopolymer or copolymer arms, the molecular weight of the monoalkenyl aromatic hydrocarbon block being from about 0.65 to about 7.5 times the molecular weight of the conjugated diene block in said block copolymer and the molecular weight of the conjugated diene block of the block copolymer being from about 0.8 to about 1.2 times the molecular weight of the conjugated diene homopolymer or copolymer blocks.
Claim 3
Dependent Claim
39 words
The selectively hydrogenated star-shaped polymer of claim 1 wherein the weight average molecular weight of the conjugated diolefin block is from about 0.9 to about 1.1 times the molecular weight of the conjugated diene block in said block copolymer.
Claim 4
Dependent Claim
38 words
The selectively hydrogenated star-shaped of claim 2 wherein the molecular weight of the conjugated diene block in said block copolymer is substantially equal to the average weight average molecular weight of the conjugated diene homopolymer or copolymer arms.
Claim 5
Dependent Claim
15 words
The selectively hydrogenated star-shaped polymer of claim 1 wherein said monoalkenyl aromatic hydrocarbon is styrene.
Claim 6
Dependent Claim
14 words
The selectively hydrogenated star-shaped polymer of claim 4 wherein said conjugated diene is isoprene.
Claim 7
Dependent Claim
150 words
A selectively hydrogenated star-shaped polymer comprising at least one arm of a block copolymer containing a single monoalkenyl aromatic hydrocarbon block and a single block having conjugated diene monomer units and a plurality of arms of a conjugated diene homopolymer or copolymer and a poly(polyalkenyl coupling agent) nucleus, said polymer containing from about 6 to about 13 total arms as determined by (GPC) on a styrene scale and one block copolymer arm, on average, for from about 6 to about 8 conjugated diolefin homopolymer or copolymer arms, the molecular weight of the monoalkenyl aromatic hydrocarbon block being from about 0.7 to about 5.0 times the molecular weight of the conjugated diene block in said block copolymer and the molecular weight of the conjugated diene block of the block copolymer being from about 0.8 to about 1.2 times the weight average molecular weight of the conjugated diene homopolymer or copolymer blocks.
Claim 8
Dependent Claim
150 words
A selectively hydrogenated star-shaped polymer comprising at least one arm of a block copolymer containing a single monoalkenyl aromatic hydrocarbon block and a single block having conjugated diene monomer units and a plurality of arms of a conjugated diene homopolymer or copolymer and a poly(polyalkenyl coupling agent) nucleus, said polymer containing from about 6 to about 13 total arms as determined by (GPC) on a styrene scale and one block copolymer arm, on average, for from about 6 to about 8 conjugated diolefin homopolymer or copolymer arms, the molecular weight of the monoalkenyl aromatic hydrocarbon block being from about 0.7 to about 5.0 times the molecular weight of the conjugated diene block in said block copolymer and the molecular weight of the conjugated diene block of the block copolymer being from about 0.8 to about 1.2 times the weight average molecular weight of the conjugated diene homopolymer or copolymer blocks.
Claim 9
Dependent Claim
37 words
The selectively hydrogenated star-shaped polymer of claim 6 wherein the molecular weight of the conjugated diolefin block is from about 0.9 to about 1.1 times the molecular weight of the conjugated diene block in said block copolymer.
Claim 10
Dependent Claim
36 words
The selectively hydrogenated star-shaped polymer of claim 7 wherein the molecular weight of the conjugated diene block in said block copolymer is substantially equal to the molecular weight of the conjugated diene homopolymer or copolymer arms.
Claim 11
Dependent Claim
15 words
The selectively hydrogenated star-shaped polymer of claim 6 wherein said monoalkenyl aromatic hydrocarbon is styrene.
Claim 12
Dependent Claim
14 words
The selectively hydrogenated star-shaped polymer of claim 9 wherein said conjugated diene is isoprene.
Claim 13
Dependent Claim
148 words
The selectively hydrogenated star-shaped polymer comprising at least one arm of a block copolymer containing a single monoalkenyl aromatic hydrocarbon block and a single block having conjugated diene monomer units and a plurality of arms of a conjugated diene homopolymer or copolymer and a poly(polyalkenyl coupling agent) nucleus, said polymer containing from about 7 to about 9 total arms as determined by (GPC) on a styrene scale and one block copolymer arm, on average, for from about 6 to about 8 conjugated diolefin homopolymer or copolymer arms, the molecular weight of the monoalkenyl aromatic hydrocarbon block being from about 0.8 to about 2.5 times the molecular weight of the conjugated diene block in said block copolymer and the molecular weight of the conjugated diene block of the block copolymer being from about 0.8 to about 1.2 times the molecular weight of the conjugated diene homopolymer or copolymer blocks.
Claim 14
Dependent Claim
148 words
The selectively hydrogenated star-shaped polymer comprising at least one arm of a block copolymer containing a single monoalkenyl aromatic hydrocarbon block and a single block having conjugated diene monomer units and a plurality of arms of a conjugated diene homopolymer or copolymer and a poly(polyalkenyl coupling agent) nucleus, said polymer containing from about 7 to about 9 total arms as determined by (GPC) on a styrene scale and one block copolymer arm, on average, for from about 6 to about 8 conjugated diolefin homopolymer or copolymer arms, the molecular weight of the monoalkenyl aromatic hydrocarbon block being from about 0.8 to about 2.5 times the molecular weight of the conjugated diene block in said block copolymer and the molecular weight of the conjugated diene block of the block copolymer being from about 0.8 to about 1.2 times the molecular weight of the conjugated diene homopolymer or copolymer blocks.
Claim 15
Dependent Claim
37 words
The selectively hydrogenated star-shaped polymer of claim 11 wherein the molecular weight of the conjugated diolefin block is from about 0.9 to about 1.1 times the molecular weight of the conjugated diene block in said block copolymer.
Claim 16
Dependent Claim
36 words
The selectively hydrogenated star-shaped polymer of claim 12 wherein the molecular weight of the conjugated diene block in said block copolymer is substantially equal to the molecular weight of the conjugated diene homopolymer or copolymer arms.
Claim 17
Dependent Claim
15 words
The selectively hydrogenated star-shaped polymer of claim 11 wherein said monoalkenyl aromatic hydrocarbon is styrene.
Claim 18
Dependent Claim
14 words
The selectively hydrogenated star-shaped polymer of claim 14 wherein said conjugated diene is isoprene.
References Cited (Backward Citations)
CA716645A
Cited
US3135716A
Cited
US3150209A
Cited
US3265765A
Cited
GB1025295A
Cited
US3231635A
Cited
US3322856A
Cited
US3496154A
Cited
US3498960A
Cited
US3554911A
Cited
US3668125A
Cited
US3775329A
Cited
US3700633A
Cited
US3772196A
Cited
US3835083A
Cited
US3835053A
Cited
US3985830B1
Cited
US3985830A
Cited
US4116917A
Cited
US4156673A
Cited
US4077893A
Cited
US4141847A
Cited
US4145298A
Cited
US4238202A
Cited
US4346193A
Cited
US4391949A
Cited
US4444953A
Cited
US4391949B1
Cited
US4444953B1
Cited
US4427834A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |