Anti-shudder additive composition and lubricating oil composition containing the same
AssigneeChevron Oronite Company LLC
InventorsJuan Buitrago, Rawls Frazier, Tony Banh
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Abstract
An anti-shudder additive composition comprising at least one neutral phosphite and at least one phosphorous-free hydrocarbyl substituted succinic dispersant selected from the group consisting of a hydrocarbyl bissuccinimide and a hydrocarbyl substituted succinic ester of a polyol and mixtures thereof, wherein the additive is used in transmission fluids to decrease shudder.
Claims30
An anti-shudder additive composition comprising:
- (a) At least one neutral phosphite compound;
- and
- (b) At least one hydrocarbyl substituted succinic dispersant selected from the group consisting of a hydrocarbyl bissuccinimide and a hydrocarbyl substituted succinic ester of a polyol and mixtures thereof, wherein the hydrocarbyl substituent has at least 50 carbon atoms,
- wherein the additive composition does not comprise an ethoxylated amine, and wherein the additive composition does not comprise a primary amide of a long chain carboxylic acid, and provided that if the lubricating oil composition also contains a monosuccinimide, then the ratio of the hydrocarbyl substituted succinic dispersant to monosuccinimide is at least 7:3.
The anti-shudder additive composition according to 2, wherein the trihydrocarbyl phosphite is trialkyl phosphite.
A lubricating oil composition comprising:
- (a) a major amount of an oil of lubricating viscosity;
- (b) an effective amount of an anti-shudder additive composition comprising:
- (i) At least one neutral phosphite compound, and
- (ii) At least one hydrocarbyl substituted succinic dispersant selected from the group consisting of a hydrocarbyl bissuccinimide and a hydrocarbyl substituted succinic ester of a polyol and mixtures thereof, wherein the hydrocarbyl substituent has at least 50 carbon atoms;
- and
- wherein the additive composition does not comprise an ethoxylated amine, and wherein the additive composition does not comprise a primary amide of a long chain carboxylic acid, and provided that if the lubricating oil composition also contains a monosuccinimide, then the ratio of the hydrocarbyl substituted succinic dispersant to monosuccinimide is at least 7:3.
A method of making an anti-shudder additive composition comprising:
- mixing from about 0.1 wt % to about 90.9 wt % of at least one neutral phosphite compound with from about 9.1 wt % to about 99.9 wt % of at least one hydrocarbyl substituted succinic dispersant selected from the group consisting of a hydrocarbyl bissuccinimide and a hydrocarbyl substituted succinic ester of a polyol and mixtures thereof, in the absence of an ethoxylated amine and a primary amide of a long chain carboxylic acid, and provided that if the additive composition also contains a monosuccinimide, then the ratio of the hydrocarbyl substituted succinic dispersant to monosuccinimide is at least 7:3.
A method of reducing shudder in a transmission comprising:
- (a) mixing an oil of lubricating viscosity with a shudder reducing effective amount of an anti-shudder additive composition comprising:
- (i) at least one neutral phosphite compound;
- (ii) at least one hydrocarbyl substituted succinic dispersant selected from the group consisting of a hydrocarbyl bissuccinimide and a hydrocarbyl substituted succinic ester of a polyol and mixtures thereof, wherein the hydrocarbyl substituent has at least 50 carbon atoms;
- in the absence of an ethoxylated amine and a primary amide of a long chain carboxylic acid;
- and
- provided that if the lubricating oil composition also contains monosuccinimide, then the ratio of the hydrocarbyl substituted succinic dispersant to monosuccinimide is at least 7:3.
- (b) adding the mixture of (a) to a transmission.
Dependencies are inferred from the claim text.