Modified high molecular weight succinimides
AssigneeChevron Research and Technology Company, a Division of Chevron U.S.A. Inc.
InventorsJames J. Harrison, William R. Ruhe, Jr.
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Abstract
Alkenyl or alkyl succinimide additives which are the reaction product of a high molecular weight alkenyl- or alkyl-substituted succinic anhydride and a polyalkylene polyamine having an average of greater than 4 nitrogen atoms per mole, wherein the reaction product is post-treated with a cyclic carbonate, are compatible with fluorocarbon engine seals and, for concentration levels at which fluorocarbon seal compatibility is achieved, possess improved dispersancy and/or detergency properties when employed in lubricating oils and fuels,
Claims37
A modified polyamino alkenyl or alkyl succinimide comprising the succinimide reaction product of:
- (i) an alkenyl- or alkyl-substituted succinic anhydride derived from a polyolefin having a Mn of about 2000 to about 2700 and a Mw/Mn ratio of about 1 to about 5;
- and
- (ii) a polyalkylene polyamine having greater than 4 nitrogen atoms per mole;
- wherein the succinimide reaction product is post-treated with a cyclic carbonate.
A modified polyamino alkenyl or alkyl succinimide according to claim wherein the succinic anhydride has a succinic ratio from about 1 to less than about 1.3.
A modified polyamino alkenyl or alkyl succinimide according to claim wherein the succinic anhydride has a succinic ratio from about 1.3 to about 1.7.
A lubricating oil composition comprising a major amount of an oil of lubricating viscosity and an effective amount of a modified polyamino alkenyl or alkyl succinimide sufficient to be compatible with fluorocarbon seals and simultaneously control engine sludge and varnish, wherein the modified succinimide comprises the succinimide reaction product of:
- (i) an alkenyl- or alkyl-substituted succinic anhydride derived from a polyolefin having a Mn of about 2000 to about 2700 and a Mw/Mn ratio of about 1 to about 5;
- and
- (ii) a polyalkylene polyamine having greater than 4 nitrogen atoms per mole;
- wherein the succinimide reaction product is post-treated with a cyclic carbonate.
A lubricating oil concentrate comprising from about 90 to about 10 weight percent of an oil of lubricating viscosity and from about 10 to about 90 weight percent on a dry polymer basis of a modified polyamino alkenyl or alkyl succinimide comprising the succinimide reaction product of:
- (i) an alkenyl- or alkyl-substituted succinic anhydride derived from a polyolefin having a Mn of about 2000 to about 2700 and a Mw/Mn ratio of about 1 to about 5;
- and
- (ii) a polyalkylene polyamine having greater than 4 nitrogen atoms per mole;
- wherein the succinimide reaction product is post-treated with a cyclic carbonate.
Dependencies are inferred from the claim text.