US4077893A
Expired / Lapsed
US
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Star-shaped dispersant viscosity index improver
Assignee: Shell USA Inc
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Filing: 1977-05-11
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Granted: 1978-03-07
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Expires: 1997-05-11
Abstract
Abstract Lubricating oil additives having both dispersant and viscosity index-improving properties are prepared by reacting a selectively hydrogenated star-shaped polymer having at least four arms of polymers or copolymers of dienes and monoalkenyl arenes with an alpha-beta unsaturated carboxylic acid or derivative, and then reacting the resulting intermediate with an alkane polyol.
Inventors
- 👤 Thomas E. Kiovsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:01
CPC Classifications
C; C10; C10M; C10M143/00; C10M143/12; C08; C08C; C08C19/00; C08C19/30; C08C19/42; C08C19/44; C08G; C08G81/00; C08G81/02; C08G81/021; C08G81/022; C10M129/00; C10M129/02; C10M129/04; C10M129/06; C10M129/08; C10M143/10; C10M145/00; C10M145/02; C10M145/10; C10M2203/00; C10M2203/10; C10M2205/00; C10M2205/02; C10M2205/026; C10M2205/04; C10M2205/06; C10M2207/00; C10M2207/02; C10M2207/021; C10M2207/022; C10M2207/023; C10M2207/024; C10M2207/28; C10M2207/281; C10M2207/282; C10M2207/283; C10M2207/286; C10M2207/287; C10M2207/288; C10M2207/289; C10M2207/32; C10M2207/34; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/086; C10M2209/10; C10M2209/103; C10M2209/104; C10M2209/12; C10M2211/00; C10M2211/02; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/06; C10M2215/064; C10M2215/065; C10M2215/08; C10M2215/082; C10M2215/086; C10M2215/22; C10M2215/221; C10M2215/225; C10M2215/226; C10M2215/24; C10M2215/26; C10M2215/28; C10M2215/30; C10M2217/00; C10M2217/02; C10M2217/04; C10M2217/046; C10M2217/06; C10M2219/00; C10M2219/04; C10M2219/046; C10M2219/08; C10M2219/082; C10M2219/087; C10M2219/088; C10M2219/089; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10M2223/042; C10M2223/045; C10M2229/00; C10M2229/02; C10M2229/04; C10M2229/05; C10N; C10N2010/00; C10N2010/04; C10N2040/00; C10N2040/04; C10N2040/042; C10N2040/044; C10N2040/046; C10N2070/00; C10N2070/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
159 words
The oil-soluble product prepared by the process comprising: a. reacting a selectively hydrogenated star-shaped polymer with an alpha-beta unsaturated carboxylic acid, anhydride or ester at a temperature of between about 150° C and about 300° C for between about 1 hour and about 20 hours wherein said star-shaped polymer comprises a poly (polyalkenyl coupling agent) nucleus and at least four polymeric arms linked to said nucleus wherein said polymeric arms are selected from the group consisting of: (i) hydrogenated homopolymers and hydrogenated copolymers of conjugated dienes; (ii) hydrogenated copolymers of conjugated dienes and monoalkenyl arenes; and (iii) mixtures thereof; and wherein at least about 80% of the aliphatic unsaturation of the starshaped polymer has been reduced by hydrogenation while less than 20% of the aromatic unsaturation has been reduced; and b. reacting the product of step (a) with an alkane polyol having at least two hydroxy groups at a temperature of between about 150° C and about 250° C.
Claim 2
Dependent Claim
159 words
The oil-soluble product prepared by the process comprising: a. reacting a selectively hydrogenated star-shaped polymer with an alpha-beta unsaturated carboxylic acid, anhydride or ester at a temperature of between about 150° C and about 300° C for between about 1 hour and about 20 hours wherein said star-shaped polymer comprises a poly (polyalkenyl coupling agent) nucleus and at least four polymeric arms linked to said nucleus wherein said polymeric arms are selected from the group consisting of: (i) hydrogenated homopolymers and hydrogenated copolymers of conjugated dienes; (ii) hydrogenated copolymers of conjugated dienes and monoalkenyl arenes; and (iii) mixtures thereof; and wherein at least about 80% of the aliphatic unsaturation of the starshaped polymer has been reduced by hydrogenation while less than 20% of the aromatic unsaturation has been reduced; and b. reacting the product of step (a) with an alkane polyol having at least two hydroxy groups at a temperature of between about 150° C and about 250° C.
Claim 3
Dependent Claim
19 words
A product, according to claim 1, wherein the number of polymeric arms is between about 7 and about 15.
Claim 4
Dependent Claim
16 words
A product, according to claim 1, wherein the polyalkenyl coupling agent is a polyvinyl aromatic compound.
Claim 5
Dependent Claim
14 words
A product, according to claim 1, wherein the polyalkenyl coupling agent is divinyl benzene.
Claim 6
Dependent Claim
23 words
A product, according to claim 1, wherein the number average molecular weight of each polymeric arm is between about 5,000 and about 150,000.
Claim 7
Dependent Claim
23 words
A product, according to claim 1, wherein the peak molecular weight of the hydrogenated star-shaped polymer is between about 100,000 and about 500,000.
Claim 8
Dependent Claim
21 words
A product, according to claim 1, wherein between about 90 and 98% of the aliphatic unsaturation has been reduced by hydrogenation.
Claim 9
Dependent Claim
15 words
A product, according to claim 4, wherein each polymeric arm is a hydrogenated polyisoprene homopolymer.
Claim 10
Dependent Claim
55 words
A product, according to claim 1, wherein said star-shaped copolymer and said carboxylic acid, anhydride or ester are reacted in the presence of a trichlorobenzene solvent in a ratio of moles of carboxylic acid, anhydride or ester to olefinic double bonds remaining in the selectively hydrogenated star-shaped polymer of between about 1:1 and about 2:1.
Claim 11
Dependent Claim
48 words
A product, according to claim 9, wherein said star-shaped polymer and said carboxylic acid, anhydride or ester are reacted in the presence of a trichlorobenzene solvent and chlorine in a molar ratio of chlorine to said carboxylic acid, anhydride or ester of between about 0.3:1 and about 1.5:1.
Claim 12
Dependent Claim
31 words
A product, according to claim 1, wherein the alkane polyol is pentaerythritol and the molar ratio of polyol to carboxylic acid, anhydride or ester is between about 0.5:1 and about 2:1.
Claim 13
Dependent Claim
38 words
A product, according to claim 1, wherein the product of step (a) is reacted with between about 0.5 and 3.0 moles of chlorine per 100 carbon atoms of the star-shaped polymer prior to reaction with the alkane polyol.
Claim 14
Dependent Claim
26 words
A lubricating composition comprising a major amount of a lubricating oil and from 0.1 to about 15.0 weight percent of the oil-soluble product of claim 1.
Claim 15
Dependent Claim
22 words
A concentrated lubricating composition comprising a lubricating oil and from 15 to 45 weight percent of the oil-soluble product of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |