US4661276A
Expired / Lapsed
US
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Grease composition
Assignee: Chevron USA Inc
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Filing: 1986-05-30
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Granted: 1987-04-28
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Expires: 2006-05-30
Abstract
Abstract Disclosed is a polyurea-thickened grease containing a polymeric material which improves the low shear stability of the grease.
Inventors
- 👤 Jeffrey E. Stemke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:33
CPC Classifications
C; C10; C10M; C10M121/00; C10M121/04; C10M2209/00; C10M2209/02; C10M2209/04; C10M2209/046; C10M2209/06; C10M2209/0613; C10M2209/08; C10M2209/0813; C10M2209/086; C10M2209/0866
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
122 words
A grease composition comprising a major amount of a lubricating oil, a polyurea gellant in an amount sufficient to thicken the lubricating oil to grease consistency, and an effective amount in the range of 0.1 to 20 weight percent to improve the low shear stability of the polyurea thickened grease of a polymer having a pKa value greater than 5.0, said polyurea gellant having the following formula: ##STR4## wherein x is a number having a value from 1 to 3, R' and R" are hydrocarbon radicals containing from 1 to 30 carbon atoms, R and R"' are hydrocarbon radicals containing from 2 to 30 carbon atoms, wherein the ratio of carbon atoms to the number of urea groups is at least 6:1.
Claim 2
Dependent Claim
122 words
A grease composition comprising a major amount of a lubricating oil, a polyurea gellant in an amount sufficient to thicken the lubricating oil to grease consistency, and an effective amount in the range of 0.1 to 20 weight percent to improve the low shear stability of the polyurea thickened grease of a polymer having a pKa value greater than 5.0, said polyurea gellant having the following formula: ##STR4## wherein x is a number having a value from 1 to 3, R' and R" are hydrocarbon radicals containing from 1 to 30 carbon atoms, R and R"' are hydrocarbon radicals containing from 2 to 30 carbon atoms, wherein the ratio of carbon atoms to the number of urea groups is at least 6:1.
Claim 3
Dependent Claim
16 words
The grease composition of claim 1 wherein said polymer has a molecular weight greater than 1,000.
Claim 4
Dependent Claim
26 words
The grease composition of claim 2 wherein said polymer has a molecular weight in the range 2,000 to 5,000,000 and a pKa value greater than 7.0.
Claim 5
Dependent Claim
13 words
The grease composition of claim 3 wherein said polymer is an oxygen-containing polymer.
Claim 6
Dependent Claim
21 words
The grease composition of claim 3 wherein said polymer is selected from the group of polyesters, polyamides, polyurethans, polyamines, or polyoxides.
Claim 7
Dependent Claim
20 words
The grease composition of claim 3, wherein said polymer is selected from polyacrylamide, polyvinyl alcohol, ethylene-vinylacetate copolymers, or polyvinyl pyrollidone.
Claim 8
Dependent Claim
21 words
The grease composition of claim 2, 3 or 4 wherein said grease contains 1 to 10 weight percent of said polymer.
Claim 9
Dependent Claim
126 words
A grease composition comprising a major amount of a lubricating oil, a polyurea gellant in an amount sufficient to thicken the lubricating oil to grease consistency, and an effective amount in the range of 0.1 to 20 weight percent to improve the low shear stability of the polyurea thickened grease of a polymer having a pKa value greater than 5.0, said polyurea gellant having the following formula: ##STR5## wherein x is a number having a value from 1 to 3; R a and R d are hydrocarbyl of from 5 to 28 carbon atoms, and R b and R c are hydrocarbylene of from 2 to 26 carbon atoms, wherein the ratio of carbon atoms to the number of urea groups is at least about 6:1.
Claim 10
Dependent Claim
126 words
A grease composition comprising a major amount of a lubricating oil, a polyurea gellant in an amount sufficient to thicken the lubricating oil to grease consistency, and an effective amount in the range of 0.1 to 20 weight percent to improve the low shear stability of the polyurea thickened grease of a polymer having a pKa value greater than 5.0, said polyurea gellant having the following formula: ##STR5## wherein x is a number having a value from 1 to 3; R a and R d are hydrocarbyl of from 5 to 28 carbon atoms, and R b and R c are hydrocarbylene of from 2 to 26 carbon atoms, wherein the ratio of carbon atoms to the number of urea groups is at least about 6:1.
Claim 11
Dependent Claim
14 words
The grease composition of claim 2 wherein said polymer is an ethylene-vinyl acetate copolymer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-04-27 | 1990-10-27 | 1991-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-27 | 1994-10-27 | 1995-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-27 | 1998-10-27 | 1999-04-28 | $7700.00 | Window Closed / Lapsed |