Process for making crosslinked copolymers of maleic anhydride an

Details Process for making crosslinked copolymers of maleic anhydride an Process for making crosslinked copolymers of maleic anhydride an

1997-09-18

1999-02-23

Smith, Jeffrey T.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526216, 526332, 526336, C08F22206, C08F21614, C08F21234, C08F 214

Patent

active

058745106

ABSTRACT:
A process for making crosslinked polymers of maleic anhydride and methyl vinyl ether is described. The process is characterized by precharging methyl vinyl ether, partially or totally, in isopropyl acetate, and a crosslinker, and then continuously feeding molten maleic anhydride and methyl vinyl ether into the thus-precharged reactor. The monomer mixture then is polymerized at a temperature of about 60.degree.-80.degree. C. The reaction product is a pumpable, homogeneous suspension of the crosslinked copolymer at a solids level of about 30-50%, which is recoverable in high yield upon removal of the solvent and filtering the suspension.

REFERENCES:
patent: 4952558 (1990-08-01), Goertz et al.
patent: 5034488 (1991-07-01), Tazi et al.

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