Process for making ethanol solutions of alkyl half-esters of cop

Details Process for making ethanol solutions of alkyl half-esters of cop Process for making ethanol solutions of alkyl half-esters of cop

1990-08-30

1991-11-12

Schofer, Joseph L.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

526318, 526332, C08K 505, C08F22216, C08F21612

Patent

active

050648977

ABSTRACT:
What is described herein is a process for making ethanol solutions of alkyl half-esters of copolymers of maleic anhydride and a C.sub.1 -C.sub.4 alkyl vinyl ether which are benzene and acetone-free. The invention is characterized by (a) precharging a reactor with excess C.sub.1 -C.sub.4 alkyl vinyl ether as both monomer reactant and solvent, and a free radical polymerization initiator, at a reaction temperature; (b) feeding the alkyl half-ester of maleic anhydride formed by reaction of substantially one mole of maleic anhydride and substantially one mole of alkanol into the precharged reactor to form the desired alkyl half-ester of the alternating copolymer of maleic anhydride and the C.sub.1 -C.sub.4 alkyl vinyl ether in excess alkyl vinyl ether as solvent; (c) cooling the reactor to room temperature; and (d) introducing ethanol solvent into the reactor and removing excess alkyl vinyl ether to form the desired half-ester copolymer in ethanol solution.

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