Solution feed, slurry polymerization process for the production

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...

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526 79, 526 87, 526208, 526216, 526271, 526332, 523120, C08F 206, C08F22206, C08F21618, A61K 6083

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049488481

ABSTRACT:
What is described herein is a solution feed, slurry precipitation polymerization process for making copolymers of maleic anhydride and an alkyl vinyl ether within a predetermined viscosity range.
The process of the invention is characterized by precharging a large excess of the alkyl vinyl ether in a reactor, feeding maleic anhydride dissolved in a minimum amount of an organic solvent into the precharged reactor, and polymerizing the monomers in the presence of a free radical initiator. The copolymer product then appears as a pumpable slurry in the reaction medium. The slurry is discharged from the reactor and the desired copolymer is obtained therefrom as a fine, white powder having specific viscosities in the range of about 1.5-6.0, and preferably about 2.6-3.5.

REFERENCES:
patent: 2694698 (1954-11-01), Grosser
patent: 3178395 (1965-04-01), Muskat
patent: 3956244 (1976-05-01), Carpenter et al.

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