US4699723A
Expired / Lapsed
US
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Dispersant-antioxidant multifunction viscosity index improver
Assignee: Afton Chemical Additives Corp
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Filing: 1986-08-20
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Granted: 1987-10-13
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Expires: 2006-08-20
Abstract
Abstract A multi-function Viscosity Index Improver having properties, including dispersancy and antioxidation, which comprises a functional ethylene-propylene copolymer having a dispersant/antioxidant unit grafted thereon.
Inventors
- 👤 Maria M. Kapuscinski
- 👤 Ronald E. Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:12
CPC Classifications
C; C10; C10M; C10M151/00; C10M151/02; C08; C08F; C08F255/00; C08F255/02; C08F255/04; C10M143/00; C10M2205/00; C10M2205/02; C10M2221/00; C10M2221/02; C10N; C10N2040/00; C10N2040/25; C10N2040/251; C10N2040/252; C10N2040/253; C10N2040/255; C10N2040/28
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
39 words
A multifunctional Viscosity Index Improver, having properties of dispersancy and antioxidation, comprising an oil-soluble, substantially linear functional ethylene-propylene copolymer having grafted thereon through an alkyl group a heterocyclic ring containing at least one atom of N, S, or O.
Claim 2
Dependent Claim
39 words
A multifunctional Viscosity Index Improver, having properties of dispersancy and antioxidation, comprising an oil-soluble, substantially linear functional ethylene-propylene copolymer having grafted thereon through an alkyl group a heterocyclic ring containing at least one atom of N, S, or O.
Claim 3
Dependent Claim
13 words
The multifunctional Viscosity Index Improver of claim 1, wherein said monomer is 4-methyl--5-vinylthiazole.
Claim 4
Independent Claim
34 words
A method of preparing a multifunctional Viscosity Index Improver, having properties including dispersancy and antioxidation, said method comprises grafting a thiazole/benzothiazole vinyl/allyl monomer onto an ethylene-propylene copolymer in the presence of a free-radical initiator.
Claim 5
Independent Claim
34 words
A method of preparing a multifunctional Viscosity Index Improver, having properties including dispersancy and antioxidation, said method comprises grafting a thiazole/benzothiazole vinyl/allyl monomer onto an ethylene-propylene copolymer in the presence of a free-radical initiator.
Claim 6
Dependent Claim
11 words
The method of claim 3, wherein said vinyl/allyl monomer is 4-methyl-5-vinylthiazole.
Claim 7
Dependent Claim
13 words
The method of claim 3, wherein said copolymer is replaced with ethylene-propylene-diene terpolymer.
Claim 8
Dependent Claim
24 words
The method of claim 3, wherein said free-radical initiator is selected from the group consisting of dicumyl peroxide, di-tertiary-butyl-peroxide, azobisisobutyronitrile, diacetylperoxide and diisopropyl peroxidecarbonate.
Claim 9
Dependent Claim
19 words
The method of claim 3, wherein the reaction mixture is maintained at about 155° C. for about 1 hour.
Claim 10
Dependent Claim
29 words
The method of claim 3, wherein said Viscosity Index Improver is added to a lubricating oil in an amount of about 0.05 to about 4.0 wt.% of the polymer.
Claim 11
Dependent Claim
30 words
The method of claim 8, wherein said Viscosity Index Improver is added to said lubricating oil in an amount of about 0.08 to about 2.0 wt. % of the polymer.
Claim 12
Dependent Claim
43 words
A lubricating oil composition comprising a major portion of a lubricating oil and a minor effective amount of a dispersant/antioxidant Viscosity Index Improver comprising an oil soluble, substantially linear, carbon-carbon backbone polymer having grafted polymerized thereon units derived from a thiazole/benzothiazole vinyl/alkyl monomer.
Claim 13
Dependent Claim
43 words
A lubricating oil composition comprising a major portion of a lubricating oil and a minor effective amount of a dispersant/antioxidant Viscosity Index Improver comprising an oil soluble, substantially linear, carbon-carbon backbone polymer having grafted polymerized thereon units derived from a thiazole/benzothiazole vinyl/alkyl monomer.
Claim 14
Dependent Claim
12 words
The lubricating oil composition of claim 10, wherein said monomer is 4-methyl-5-vinyltlthiazole.
Claim 15
Dependent Claim
20 words
The lubricating oil composition of claim 10, wherein said backbone polymer is a copolymer of ethylene-propylene or of ethylene-propylene-diene terpolymer.
Claim 16
Dependent Claim
23 words
The lubricating oil composition of claim 10, wherein the molecular weight M n of said backbone polymer is about 10,000 to about 1,000,000.
Claim 17
Dependent Claim
20 words
The lubricating oil composition of claim 10, wherein said minor effective amount is about 1 to about 20 wt. %.
Claim 18
Dependent Claim
53 words
A lubricating oil composition comprising a major portion of a lubricating oil and 0.1 to about 10 wt. % of, as an additive, a graft polymer comprising an oil-soluble, substantially linear, carbon-carbon backbone copolymer of ethylene propylene or a terpolymer of ethylene propylene-third diene monomer having graft polymerized thereon units derived from 4-methyl-5-vinylthiazole.
Claim 19
Dependent Claim
53 words
A lubricating oil composition comprising a major portion of a lubricating oil and 0.1 to about 10 wt. % of, as an additive, a graft polymer comprising an oil-soluble, substantially linear, carbon-carbon backbone copolymer of ethylene propylene or a terpolymer of ethylene propylene-third diene monomer having graft polymerized thereon units derived from 4-methyl-5-vinylthiazole.
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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) | 1990-10-12 | 1991-04-13 | 1991-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-12 | 1995-04-13 | 1995-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-12 | 1999-04-13 | 1999-10-13 | $7700.00 | Window Closed / Lapsed |