Process for the continuous production in solution of styrene the

Details Process for the continuous production in solution of styrene the Process for the continuous production in solution of styrene the

1988-04-04

1990-05-15

Briggs, Sr., Wilbert J.

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

Synthetic resins

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

525 54, 525265, 525316, C08F25506, C08F27904

Patent

active

049258966

ABSTRACT:
Process for the continuous production in solution of styrene thermoplastic resins by polymerization of a vinyl-aromatic monomer and of a vinyl-nitrile monomer in the presence of an elastomer and of a starter, wherein polymerization is conducted in two or more steps, wherein the elastomeric component is fed, in solution in the solvent and/or in the monomers, to the first step, polymerization is carried out in the subsequent steps at temperatures ranging from 70.degree. to 150.degree. C., in each step the reaction mass is gently and homogeneously stirred and the reaction product is caused to flow to a thin evaporator heated at 150.degree.-300.degree. C.

REFERENCES:
patent: 3658946 (1972-04-01), Bronstert et al.
patent: 4419488 (1983-12-01), Fukumoto et al.

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