US5002676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Block copolymers
Assignee: Shell USA Inc
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Filing: 1989-12-06
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Granted: 1991-03-26
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Expires: 2009-12-06
Abstract
Abstract Novel, selectively hyrogenated block compolymers, which compolymers comprise at least one block of polymerized alkyl methacrylate and one block of polymerized conjugated alkadiene, provide improved dispersant properties and viscosity index improvement to hydrocarbon lubricating oils.
Inventors
- 👤 Carl L. Willis
- 👤 Donn A. DuBois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:07
CPC Classifications
C; C10; C10M; C10M145/00; C10M145/02; C10M145/10; C10M145/12; C10M145/14; C08; C08F; C08F8/00; C08F8/04; C10M143/00; C10M143/12; C10M2205/00; C10M2205/06; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10N; C10N2040/00; C10N2040/02; C10N2040/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
70 words
A selectively hydrogenated block copolymer resulting from hydrogenation of at least about 90% of the ethylenic unsaturation of an ABA block copolymer wherein A is a block of polymerized t-butyl methacrylate and B is a block of polymerized butadiene or isoprene having from about 10% to about 90% of 1,4-polymerization, wherein the polymerized t-butyl methacrylate provides from about 5% to about 80% of the molecular weight of the block copolymer.
Claim 2
Dependent Claim
70 words
A selectively hydrogenated block copolymer resulting from hydrogenation of at least about 90% of the ethylenic unsaturation of an ABA block copolymer wherein A is a block of polymerized t-butyl methacrylate and B is a block of polymerized butadiene or isoprene having from about 10% to about 90% of 1,4-polymerization, wherein the polymerized t-butyl methacrylate provides from about 5% to about 80% of the molecular weight of the block copolymer.
Claim 3
Dependent Claim
16 words
The selectively hydrogenated block copolymer of claim 1 wherein B is a block of polymerized butadiene.
Claim 4
Dependent Claim
16 words
The selectively hydrogenated block copolymer of claim 1 wherein B is a block of polymerized isoprene.
Claim 5
Dependent Claim
96 words
A lubricating oil composition comprising a major proportion of a hydrocarbon oil and from about 0.1% by weight to about 5% by weight, based on total composition, of a selectively hydrogenated block copolymer resulting from hydrogenation of at least 90% of the ethylenic unsaturation of an ABA block copolymer wherein A is a block of polymerized t-butyl methacrylate and B is a block of polymerized butadiene or isoprene having from about 10% to about 90% 1,4-polymerization, wherein the polymerized t-butyl methacrylate provides from about 5% to about 80% of the molecular weight of the block copolymer.
Claim 6
Dependent Claim
96 words
A lubricating oil composition comprising a major proportion of a hydrocarbon oil and from about 0.1% by weight to about 5% by weight, based on total composition, of a selectively hydrogenated block copolymer resulting from hydrogenation of at least 90% of the ethylenic unsaturation of an ABA block copolymer wherein A is a block of polymerized t-butyl methacrylate and B is a block of polymerized butadiene or isoprene having from about 10% to about 90% 1,4-polymerization, wherein the polymerized t-butyl methacrylate provides from about 5% to about 80% of the molecular weight of the block copolymer.
Claim 7
Dependent Claim
15 words
The lubricating oil composition of claim 4 wherein B is a block of polymerized butadiene.
Claim 8
Dependent Claim
15 words
The lubricating oil composition of claim 4 wherein B is a block of polymerized isoprene.
References Cited (Backward Citations)
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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) | 1994-03-25 | 1994-09-24 | 1995-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-25 | 1998-09-24 | 1999-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-25 | 2002-09-24 | 2003-03-26 | $7700.00 | Window Closed / Lapsed |