Process for making polystyrene

Details Process for making polystyrene Process for making polystyrene

1977-07-25

1979-07-17

Michl, Paul R.

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

Synthetic resins

Polymerizing in tubular or loop reactor

526 65, 526237, 526346, 585428, C08F11208

Patent

active

041615735

ABSTRACT:
Disclosed is a method for making polystyrene with M.sub.w between about 1,000 and about 50,000 and M.sub.w /M.sub.n ratio of less than about 8 by cationically polymerizing styrene monomer under substantially isothermal conditions where the conversion of styrene monomer is carried out in 2 or more stages by contacting with a cation generator. The polystyrene product finds utility as plasticizer for high molecular weight polystyrenes, as a binder resin in various coating applications, and as a precursor for further functionalized polystyrene derivatives. For example, a polystyrene of about 13,000 M.sub.w and M.sub.w /M.sub.n of about 4.9 is prepared by contacting styrene monomer with BF.sub.3 in 4 stages between a temperature of about 60.degree. C. and about 80.degree. C.

REFERENCES:
patent: 2499796 (1950-03-01), Surmatis
patent: 3385905 (1968-05-01), Smith
patent: 3763256 (1973-10-01), Massie
patent: 3769359 (1973-10-01), Massie
patent: 3859268 (1975-01-01), Novack
patent: 3988284 (1976-10-01), Wurmb

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