Star-shaped polymer reacted with dicarboxylic acid and amine as dispersant viscosity index improver
First Claim
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1. The oil-soluble product prepared by the process comprising:
- a. reacting a selectively hydrogenated star-shaped polymer with an excess of 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 between about 7 and about 15 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 star-shaped polymer has been reduced; and
b. reacting the product of step (a) with a C1 to C18 amine containing 1 to 8 nitrogen atoms at a temperature of between about 150°
C. and about 250°
C. wherein the molar ratio of amine to carboxylic acid, anhydride or ester is between about 0.1;
1 and about 2;
1.
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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 amine.
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Citations
14 Claims
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1. The oil-soluble product prepared by the process comprising:
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a. reacting a selectively hydrogenated star-shaped polymer with an excess of 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 between about 7 and about 15 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 star-shaped polymer has been reduced; and b. reacting the product of step (a) with a C1 to C18 amine containing 1 to 8 nitrogen atoms at a temperature of between about 150°
C. and about 250°
C. wherein the molar ratio of amine to carboxylic acid, anhydride or ester is between about 0.1;
1 and about 2;
1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification