Process for producing N-vinyl pyrrolidone polymer having low res

Details Process for producing N-vinyl pyrrolidone polymer having low res Process for producing N-vinyl pyrrolidone polymer having low res

1994-06-07

1996-04-09

Zitomer, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 78, 526 79, 526 81, 526 86, 5262181, 526260, 526263, 526264, 526312, 5263297, 526319, 5263182, 526321, 5263441, 526342, C08F 404, C08F 628, C08F 2610

Patent

active

055063187

ABSTRACT:
This invention relates to an improved process for the batch polymerization, neat, of a monomer system comprising N-vinyl pyrrolidone monomer utilizing an oil soluble,-thermally activated, free radical initiator. The improvement for reducing the monomer level from about 1 to 2% by weight of the polymerization product to a level below about 0.2 and preferably below about 0.1% by weight of the polymerization reaction product comprises continuously adding an oil soluble azo type free radical generating catalyst to the polymerization reaction product and establishing and maintaining the polymerization reaction product containing residual monomer at a temperature and for a time sufficient to effect substantial polymerization of the residual monomer. Typically the oil soluble, azo type free radical generating catalyst is azobis(isobutyronitrile).

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