Two-step thermal process for the preparation of alkenyl succinic

Details Two-step thermal process for the preparation of alkenyl succinic Two-step thermal process for the preparation of alkenyl succinic

1992-07-23

1997-04-29

Zitomer, Fred

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

252 56D, 525284, 525298, 5253274, 5253337, 525386, 525387, 525416, 508232, C10M14502, C08F25502, C08F25508, C08F25510

Patent

active

056250045

ABSTRACT:
A process for the preparation of an alkenyl-substituted succinic anhydride wherein the alkenyl substituent has a number average molecular weight of from about 500 to 5000 and the average number of succinic groups per alkenyl group is greater than 1.2 which comprises:
(a) reacting a polyolefin having an alkylvinylidene isomer content of less than about 10 percent and a number average molecular weight of about 500 to 5000 with maleic anhydride at a temperature in the range of about 200.degree. C. to 250.degree. C. to provide a mixture of alkenyl succinic anhydride having an average of about 1.0 succinic group per alkenyl group and unreacted polyolefin, and
(b) reacting the mixture of alkenyl succinic anhydride and unreacted polyolefin from step (a) with maleic anhydride in the presence of a free radical initiator at a temperature in the range of about 100.degree. C. to 220.degree. C. to thereby provide an alkenyl succinic anhydride having an average of greater than 1.2 succinic groups per alkenyl group.

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patent: 3219666 (1965-11-01), Norman et al.
patent: 3361673 (1968-01-01), Stuart et al.
patent: 3367864 (1968-02-01), Elliott
patent: 3381022 (1968-04-01), Le Suer
patent: 4234435 (1980-11-01), Meinhardt et al.
patent: 4873004 (1989-10-01), Beverwijk et al.
patent: 5112507 (1992-05-01), Harrison

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