Process for making copolymers of maleic anhydride and a C.sub.1

Details Process for making copolymers of maleic anhydride and a C.sub.1 Process for making copolymers of maleic anhydride and a C.sub.1

1990-08-09

1991-07-23

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C08F 3402

Patent

active

050344870

ABSTRACT:
What is described herein is a process for making a copolymer of high specific viscosity by polymerization of maleic anhydride and a C.sub.1 -C.sub.4 alkyl vinyl ether monomer. The invention involves polymerizing said monomers to form a slurry of said copolymer in excess alkyl vinyl ether and toluene and is characterized by the steps of: (a) precharging a reactor with C.sub.1 -C.sub.4 alkyl vinyl ether as solvent at a reaction temperature, (b) feeding a mixture of maleic anhydride and a C.sub.1 -C.sub.4 alkyl vinyl ether in substantially stoichiometric amounts, preferably with a slight excess of the alkyl vinyl there, and at a selected rate, into said precharged reactor, and (c) simultaneously feeding a predetermined mixture of toluene and a polymerization initiator continuously over substantially the entire period of polymerization.

REFERENCES:
patent: 2782182 (1957-02-01), Verburg
patent: 3532771 (1970-10-01), Field et al.
patent: 3553183 (1971-01-01), Field et al.
patent: 3632561 (1972-01-01), Gibb et al.
patent: 4370454 (1983-01-01), Messmer et al.

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