US4033888A
Expired / Lapsed
US
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Dispersant VI improver
Assignee: Shell USA Inc
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Filing: 1976-10-18
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Granted: 1977-07-05
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Expires: 1996-10-18
Abstract
Abstract Lubricating oil additives having both dispersant and viscosity-index improving properties are prepared by reacting a block copolymer with maleic anhydride and an alkane polyol. The block copolymer has the general configuration A-B wherein A is a monoalkenyl arene block and B is a selectively hydrogenated conjugated diene block having between 75 and 98 percent hydrogenated double bonds.
Inventors
- 👤 Thomas E. Kiovsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:24
CPC Classifications
C; C08; C08G; C08G81/00; C08G81/02; C08G81/024; C08G81/025; C08F; C08F287/00; C08F8/00; C08F8/14; C08F8/30; C08F8/32; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/18; C10L1/192; C08F2810/00; C08F2810/20; C10M; C10M2205/00; C10M2205/02; C10M2205/026; C10M2205/04; C10M2205/06; C10M2207/00; C10M2207/02; C10M2207/021; C10M2207/022; C10M2207/023; C10M2207/024; C10M2207/28; C10M2207/282; C10M2207/283; C10M2207/287; 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; C10M2215/086; C10M2215/24; C10M2215/26; C10M2215/28; C10M2217/00; C10M2217/02; C10M2217/024; C10M2217/028; 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; C10N2070/00; C10N2070/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
145 words
The oil-soluble product prepared by the process comprising: (a) reacting a selectively hydrogenated block copolymer having the general configuration A-B with maleic anhydride at a temperature of between about 180° C. and 250° C. and in the presence of a solvent wherein each polymer block A is a monoalkenylarene polymer having an average molecular weight of between about 25,000 and about 50,000 and each block B is a polymer of a C 4-5 conjugated diene having an average molecular weight of between about 35,000 and about 100,000 wherein between about 80% and about 98% of the aliphatic unsaturation has been reduced by hydrogenation while less than about 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
145 words
The oil-soluble product prepared by the process comprising: (a) reacting a selectively hydrogenated block copolymer having the general configuration A-B with maleic anhydride at a temperature of between about 180° C. and 250° C. and in the presence of a solvent wherein each polymer block A is a monoalkenylarene polymer having an average molecular weight of between about 25,000 and about 50,000 and each block B is a polymer of a C 4-5 conjugated diene having an average molecular weight of between about 35,000 and about 100,000 wherein between about 80% and about 98% of the aliphatic unsaturation has been reduced by hydrogenation while less than about 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
48 words
The composition of claim 1 wherein said block copolymer and said maleic anhydride are reacted in the presence of a trichlorobenzene solvent in a ratio of moles of maleic anhydride to olefinic double bonds remaining in the selectively hydrogenated block copolymer of between about 1:1 and about 2:1.
Claim 4
Dependent Claim
40 words
The composition of claim 2 wherein said block copolymer and said maleic anhydride are reacted in the presence of a trichlorobenzene solvent and chlorine in a molar ratio of chlorine to maleic anhydride of between about 0.3:1 and about 1.5:1.
Claim 5
Dependent Claim
10 words
The composition of claim 1 wherein the diene is isoprene.
Claim 6
Dependent Claim
27 words
The composition of claim 1 wherein the alkane polyol is pentaerythritol and the molar ratio of polyol to maleic anhydride is between about 0.5:1 and about 2:1.
Claim 7
Dependent Claim
25 words
The composition of claim 5 wherein between about 90% and about 95% of the aliphatic unsaturation in the block copolymer has been reduced by hydrogenation.
Claim 8
Dependent Claim
26 words
A lubricating composition comprising a major amount of a lubricating oil and from 0.1 to about 10.0 weight percent of the oil-soluble product of claim 1.
Claim 9
Dependent Claim
28 words
A lubricating concentrate composition comprising a major amount of a lubricating oil and from about 10 to about 45 weight percent of the oil-soluble product of claim 1.
References Cited (Backward Citations)
US3448174A
Cited
US3954812A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |