Process for producing styrenic polymer

Details Process for producing styrenic polymer Process for producing styrenic polymer

1992-02-11

1993-03-02

Teskin, Fred

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

Synthetic resins

Polymerizing in two or more physically distinct zones

526 88, 5262323, 526293, 526346, C08F 436, C08F 202

Patent

active

051910403

ABSTRACT:
A process for producing a styrenic polymer suitable for making molded products which has excellent quality without a decrease in the productivity. The process comprises feeding a compound consisting essentially of a styrenic monomer to 2 to 6 units of reactors connected in series and carrying out a bulk polymerization at a reaction temperature of 90.degree. to 200.degree. C. and a difference of reaction temperatures among the units of reactors of not more than 40.degree. C. and in the presence of 10 to 450 ppm by weight of an organic peroxide represented by the following formula (I): ##STR1## wherein R represents a tertiary alkyl group or a tertiary aralkyl group, and R.sup.1 and R.sup.2 each represent an alkyl group having 1 to 2 carbon atoms, the styrenic polymer having a weight average molecular weight of 30.times.10.sup.4 to 70.times.10.sup.4 and a ratio of weight average molecular weight (Mw) to number average molecular weight (Mn of not more than 3.0.

REFERENCES:
patent: 3357964 (1967-12-01), Gulpen et al.
patent: 3639372 (1972-02-01), Haynes, Jr. et al.
patent: 3859268 (1975-01-01), Novack et al.
patent: 4042768 (1977-08-01), Muller et al.

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