Patent CA744263A successfully refreshed from Google Patents.
Patent US4026809A successfully refreshed from Google Patents.
US4026809A
Expired / Lapsed
US
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Lubricating compositions containing methacrylate ester graft copolymers as useful viscosity index improvers
Assignee: Texaco Inc
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Filing: 1974-12-19
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Granted: 1977-05-31
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Expires: 1994-12-19
Abstract
Abstract Lubricating compositions exhibiting an improved viscosity index are prepared by adding to a lubricating oil base stock a small amount of graft copolymer of a methacrylate ester and an ethylene/propylene/alkylidene norbornene terpolymer.
Inventors
- 👤 Donald R. Lachowicz
- 👤 Charles B. Holder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:38
CPC Classifications
C; C10; C10M; C10M145/00; C10M145/02; C10M145/10; C10M145/12; C10M145/14; C08; C08F; C08F255/00; C08F255/02; C08F255/06; C10M143/00; C10M143/02; C10M2207/00; C10M2207/02; C10M2207/023; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2217/00; C10M2217/02; C10M2217/04; C10M2219/00; C10M2219/04; C10M2219/044; C10M2229/00; C10M2229/02; C10M2229/04; C10M2229/041; C10M2229/05
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
175 words
A lubricating composition comprising a major portion of a hydrocarbon lubricating oil and a minor portion sufficient to improve the viscosity index of said oil of a graft copolymer prepared by (A) contacting an ethylene/propylene/5-alkylidene-2-norbornene backbone terpolymer wherein the alkylidene group has from 1 to 16 carbon atoms and wherein the terpolymer has a molecular weight of about 4,000 to about 200,000, with dinitrogen tetroxide at a temperature of from about -30° to about 20° C., wherein the amount of dinitrogen tetroxide introduced is from about 0.00001 to about 0.01 mole/g of the terpolymer, to form a intermediate backbone terpolymer product having incorporated therein nitro and nitrite groups on the olefinic carbon atoms of the 5-alkylidene-2-norborene units of the said terpolymer, and (B) reacting said intermediate backbone terpolymer product at a temperature of from about 35° to about 175° C. with an acrylate of the formula: ##STR10## wherein R c is hydrogen or alkyl of from 1 to 3 inclusive carbon atoms and R d is alkyl of from 1 to 30 inclusive carbon atoms.
Claim 2
Dependent Claim
175 words
A lubricating composition comprising a major portion of a hydrocarbon lubricating oil and a minor portion sufficient to improve the viscosity index of said oil of a graft copolymer prepared by (A) contacting an ethylene/propylene/5-alkylidene-2-norbornene backbone terpolymer wherein the alkylidene group has from 1 to 16 carbon atoms and wherein the terpolymer has a molecular weight of about 4,000 to about 200,000, with dinitrogen tetroxide at a temperature of from about -30° to about 20° C., wherein the amount of dinitrogen tetroxide introduced is from about 0.00001 to about 0.01 mole/g of the terpolymer, to form a intermediate backbone terpolymer product having incorporated therein nitro and nitrite groups on the olefinic carbon atoms of the 5-alkylidene-2-norborene units of the said terpolymer, and (B) reacting said intermediate backbone terpolymer product at a temperature of from about 35° to about 175° C. with an acrylate of the formula: ##STR10## wherein R c is hydrogen or alkyl of from 1 to 3 inclusive carbon atoms and R d is alkyl of from 1 to 30 inclusive carbon atoms.
Claim 3
Dependent Claim
19 words
The lubricating composition of claim 1 wherein the said backbone terpolymer is a terpolymer of ethylene, propylene and 5-ethylidene-2-norbornene.
Claim 4
Dependent Claim
20 words
The lubricating composition of claim 1 wherein the molecular weight of the graft copolymer is about 6500 to about 1,000,000.
Claim 5
Dependent Claim
15 words
The lubricating composition of claim 1 wherein said acrylate utilized in (B) is lauryl methacrylate.
Claim 6
Dependent Claim
32 words
The lubricating composition of claim 1 wherein the said terpolymer utilized in (A) is ethylene/propylene/5-ethylidene-2-norbornene having a molecular weight of about 91,000 and the said acrylate utilized in (B) is lauryl methacrylate.
Claim 7
Dependent Claim
210 words
A lubricating composition comprising a major portion of a hydrocarbon lubricating oil and a minor portion sufficient to improve the viscosity index of said oil of a graft copolymer prepared by: (A) contacting an ethylene/propylene/5-alkylidene-2-norbornene backbone terpolymer, wherein the alkylidene group has from 1 to 16 carbon atoms and wherein the terpolymer has a molecular weight of about 4,000 to about 200,000 with a mixture of dinitrogen tetroxide and oxygen at a temperature of from about -30° to about 20° C. to form an intermediate backbone polymer product having incorporated therein nitro and peroxy nitrate groups on the olefinic carbon atoms of the 5-alkylidene-2-norbornene units of the said terpolymer, wherein the mole ratio of dinitrogen tetroxide to oxygen in the said mixture is from about 1:1 to about 0.05:1 and wherein the amount of dinitrogen tetroxide introduced is from about 0.00001 to about 0.01 mole/g of the backbone polymer, and (B) reacting the said intermediate backbone polymer product at a temperature of from about 35° to about 175° C. with an acrylate of the formula: ##STR11## wherein R c is selected from the group consisting of hydrogen and alkyl of from 1 to 3 inclusive carbon atoms and R d is alkyl of from 1 to 30 inclusive carbon atoms.
Claim 8
Dependent Claim
210 words
A lubricating composition comprising a major portion of a hydrocarbon lubricating oil and a minor portion sufficient to improve the viscosity index of said oil of a graft copolymer prepared by: (A) contacting an ethylene/propylene/5-alkylidene-2-norbornene backbone terpolymer, wherein the alkylidene group has from 1 to 16 carbon atoms and wherein the terpolymer has a molecular weight of about 4,000 to about 200,000 with a mixture of dinitrogen tetroxide and oxygen at a temperature of from about -30° to about 20° C. to form an intermediate backbone polymer product having incorporated therein nitro and peroxy nitrate groups on the olefinic carbon atoms of the 5-alkylidene-2-norbornene units of the said terpolymer, wherein the mole ratio of dinitrogen tetroxide to oxygen in the said mixture is from about 1:1 to about 0.05:1 and wherein the amount of dinitrogen tetroxide introduced is from about 0.00001 to about 0.01 mole/g of the backbone polymer, and (B) reacting the said intermediate backbone polymer product at a temperature of from about 35° to about 175° C. with an acrylate of the formula: ##STR11## wherein R c is selected from the group consisting of hydrogen and alkyl of from 1 to 3 inclusive carbon atoms and R d is alkyl of from 1 to 30 inclusive carbon atoms.
Claim 9
Dependent Claim
19 words
The lubricating composition of claim 6 wherein the said backbone terpolymer is a terpolymer of ethylene, propylene and 5-ethylidene-2-norbornene.
Claim 10
Dependent Claim
20 words
The lubricating composition of claim 6 wherein the molecular weight of the graft copolymer is about 6500 to about 1,000,000.
Claim 11
Dependent Claim
16 words
The lubricating composition of claim 6 wherein the said acrylate utilized in (B) is lauryl methacrylate.
Claim 12
Dependent Claim
19 words
The lubricating composition of claim 6 wherein in (B) a mixture of butyl methacrylate and lauryl methacrylate is utilized.
Claim 13
Dependent Claim
19 words
The lubricating composition of claim 6 wherein in (B) a mixture of methyl methacrylate and lauryl methacrylate is utilized.
Claim 14
Dependent Claim
34 words
The lubricating composition of claim 6 wherein in (A) the terpolymer employed in ethylene/propylene/5-ethylidene-2-norbornene having a molecular weight of about 11,600 and in (B) a mixture of butyl methacrylate and lauryl methacrylate is utilized.
Claim 15
Dependent Claim
34 words
The lubricating composition of claim 6 wherein in (A) the terpolymer employed is ethylene/propylene/5-ethylidene-2-norbornene having a molecular weight of about 76,000 and in (B) a mixture of methyl methacrylate and lauryl methacrylate is utilized.
Claim 16
Dependent Claim
16 words
The lubricating composition of claim 1 wherein the said acrylate utilized in (B) is methyl methacrylate.
Claim 17
Dependent Claim
16 words
The lubricating composition of claim 6 wherein the said acrylate utilized in (B) is methyl methacrylate.
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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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |