Fatty alkyl succinate ester and succinimide modified copolymers

Details Fatty alkyl succinate ester and succinimide modified copolymers Fatty alkyl succinate ester and succinimide modified copolymers

1977-03-14

1979-10-16

Shaver, Paul F.

Compositions

Electrolytes for electrical devices

525329, 525375, 525348, 525383, C08G 904, C08G 3732

Patent

active

041712730

ABSTRACT:
Fatty alkyl succinate ester and succinimide modified copolymers of ethylene and an alpha-olefin, such as an ethylene-propylene copolymer, are useful as shear stable viscosity index (VI) improvers, dispersants and pour point depressants in lubricating oils. Especially useful is the succinate ester of mixtures of primary n-alkanols containing about 12 to about 18 carbon atoms and the N-(3-dimethylaminopropyl) succinimide derivative of the copolymer of ethylene and an alpha-olefin, such as an ethylene-propylene copolymer. This succinate ester-succinimide derivative is prepared by reacting the copolymer in an aromatic solvent with maleic anhydride in the presence of a free radical initiator, then esterifying the anhydride with a fatty alcohol or mixtures thereof in the presence of an acidic catalyst and finally converting any unreacted anhydride and half esters to the succinimide by reaction with a polyamine containing a primary amine. Additive concentrates containing 5 to 30 wt. % of the copolymer derivative in a solvent facilitate the introduction of the additive into a lubricating oil blend.

REFERENCES:
patent: 3272746 (1966-09-01), LeSuer et al.
patent: 3872019 (1975-03-01), Culbertson et al.
patent: 3950341 (1976-04-01), Okamoto et al.
patent: 4053426 (1977-10-01), Davis et al.

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