Modified polyisobutylene succinimide dispersants having improved seal, sludge, and deposit performance
AssigneeThe Lubrizol Corporation
InventorsCarl F. Stachew, Gordon D. Lamb, William D. Abraham, Mary Galic Raguz
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Abstract
A composition suitable for reducing sludge and degradation of elastomer seals in engines comprises an oil of lubrication viscosity and a minor amount of a sludge preventing/seal protecting nitrogen containing dispersant, which is a reaction product of a hydrocarbyl-substituted succinic acylating agent having a limited amount of low molecular weight substituent; and a polyamine or condensed polyamine containing less than 20 mole percent of polyamine components of 6 or fewer nitrogen atoms.
Claims25
A composition suitable for reducing engine sludge and degradation of elastomer seals comprising
- a major amount of an oil of lubricating viscosity and
- a minor amount of a nitrogen-containing dispersant wherein the nitrogen containing dispersant is a reaction product of
- (I) a hydrocarbyl-substituted succinic acylating agent, wherein 15 to about 20 mole percent of the individual molecules thereof have a hydrocalbyl substituent with a molecular weight of less than 500;
- wherein the hydrocarbyl substituent is a polymeric species consisting essentially of olefin monomer units of at least 3 carbon atoms;
- and
- (II) at least one polyamine, wherein the polyamine is
- (a) a polyalkylene amine containing at least one H—N< group;
- or
- (b) a condensate of (i) a polyalkylene amine containing at least one H—N< group with (ii) at least one alcohol containing at least one ether group, amine group, nitro group, or additional alcohol group;
- wherein in said polyamine (a) or condensed polyamine (b) no more than about 20 mole percent of the molecules contain 6 or fewer nitrogen atoms.
A composition suitable for reducing engine sludge and degradation of elastomer seals comprising
- a major amount of an oil of lubricating viscosity and
- a minor amount of a nitrogen-containing dispersant wherein the nitrogen containing dispersant is a reaction product of
- (I) a hydrocarbyl-substituted succinic acylating agent wherein the hydrocarbyl substituent is prepared from a polymeric species consisting essentially of olefin monomer units of at least 3 carbon atoms and wherein 15 to about 20 mole percent of the individual molecules of said polymeric species have a molecular weight of less than 500;
- and
- (II) at least one polyamine, wherein the polyamine is
- (a) a polyalkylene amine containing at least one H—N< group;
- or
- (b) a condensate of (i) a polyalkylene amine containing at least one H—N< group with (ii) at least one alcohol containing at least one ether group, amine group, nitro group, or additional alcohol group;
- wherein in said polyamine (a) or condensed polyamine (b) no more than about 20 mole percent of the molecules contain 6 or fewer nitrogen atoms.
Dependencies are inferred from the claim text.