Acid catalyzed polymerization

Details Acid catalyzed polymerization Acid catalyzed polymerization

1998-04-24

1999-09-07

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 86, 526193, 526204, 526222, 526224, 526225, 526232, 5262321, 5262323, 526233, 526234, 5263186, 5263292, 526347, C08F22006, C08F22010, C08F 202

Patent

active

059488743

ABSTRACT:
The present invention is an improvement in a free radical bulk polymerization process for preparing a high molecular weight polymer from a vinyl aromatic monomer characterized in that the polymerization is conducted in the presence of an acid catalyst having a pKa at 25.degree. C. of less than 2, or salt thereof, wherein the improvement comprises dispersing the acid catalyst, or salt thereof, in a (meth)acrylic acid or ester thereof, prior to contact with the vinyl aromatic monomer. The (meth)acrylic acid or ester allows the acid catalyst to be dispersed within the vinyl aromatic monomer without causing cationic polymerization. The acid catalyst, or salt thereof, catalyzes the free radical polymerization reaction such that high molecular weight polymers are produced in reasonable reaction times.

REFERENCES:
patent: 5115055 (1992-05-01), Dais et al.
patent: 5145924 (1992-09-01), Shero et al.
patent: 5254650 (1993-10-01), Fukumura et al.
patent: 5608023 (1997-03-01), Odell et al.

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