US4032459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricating compositions containing hydrogenated butadiene-isoprene copolymers
Assignee: Shell USA Inc
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Filing: 1976-01-29
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Granted: 1977-06-28
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Expires: 1996-01-29
Abstract
Abstract Novel lubricating compositions are provided comprising a lubricating oil modified with a pour point depressant and as a superior viscosity index improver, a copolymer of butadiene and isoprene having between 20-55% 1,4-configuration, this polymer then having been hydrogenated to remove substantially all of the olefinic unsaturation.
Inventors
- 👤 Ronald K. Crossland
- 👤 David J. St. Clair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:44
CPC Classifications
C; C10; C10M; C10M157/00; C10M157/04; C10M2205/00; C10M2205/06; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2217/00; C10M2217/02; C10M2217/028; C10M2217/06; C10M2219/00; C10M2219/04; C10M2219/046; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/045; C10N; C10N2040/00; C10N2040/04; C10N2040/042; C10N2040/044; C10N2040/046; C10N2070/00; C10N2070/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
101 words
An improved lubricating oil composition comprising a major proportion of a hydrocarbon lubricating oil, a pour point depressing amount of a pour point depressant, and a viscosity index improving amount of a viscosity index improver, the improvement wherein said viscosity index improver comprises a hydrogenated copolymer of butadiene and isoprene wherein the weight ratio of butadiene to isoprene is between about 10:90 and 70:30 and from about 20% to about 55% of the precursor copolymer units are in the 1,4-configuration and wherein the olefinic bonds are substantially saturated during hydrogenation, the average molecular weight being between about 40,000 and about 225,000.
Claim 2
Dependent Claim
101 words
An improved lubricating oil composition comprising a major proportion of a hydrocarbon lubricating oil, a pour point depressing amount of a pour point depressant, and a viscosity index improving amount of a viscosity index improver, the improvement wherein said viscosity index improver comprises a hydrogenated copolymer of butadiene and isoprene wherein the weight ratio of butadiene to isoprene is between about 10:90 and 70:30 and from about 20% to about 55% of the precursor copolymer units are in the 1,4-configuration and wherein the olefinic bonds are substantially saturated during hydrogenation, the average molecular weight being between about 40,000 and about 225,000.
Claim 3
Dependent Claim
28 words
A composition according to claim 1 wherein the pour point depressant is a copolymer of C 8-30 alkyl methacrylate or a terpolymer of these with a vinyl pyridine.
Claim 4
Dependent Claim
23 words
The composition of claim 1 in which said hydrogenated copolymer contains up to 35 mol percent of a co-monomer comprising a monoalkenyl arene.
Claim 5
Dependent Claim
18 words
The composition of claim 1 wherein the weight ratio of butadiene to isoprene is between 65:35 and 45:55.
Claim 6
Dependent Claim
12 words
The composition according to claim 3 wherein the monoalkenyl arene is styrene.
Claim 7
Dependent Claim
14 words
The composition according to claim 1 wherein the copolymer is an essentially random copolymer.
Claim 8
Dependent Claim
26 words
The composition according to claim 3 wherein the copolymer comprises a polymer block of the monoalkenyl arene and a random copolymer block of butadiene and isoprene.
Claim 9
Dependent Claim
28 words
A composition according to claim 1 wherein the amount of viscosity index improver employed is from about 0.4 to about 4.0% by weight of the lubricating oil composition.
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) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |