Solution feed, slurry polymerization process for the production

Details Solution feed, slurry polymerization process for the production Solution feed, slurry polymerization process for the production

1989-04-07

1990-08-14

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

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

Patent

active

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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