Process for preparing styrenic polymer foams

Details Process for preparing styrenic polymer foams Process for preparing styrenic polymer foams

1978-01-11

1979-11-06

Henderson, C. A.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

260DIG24, 521146, 521147, 526206, 526207, 526211, 526212, 526217, C08J 902

Patent

active

041736885

ABSTRACT:
Styrenic polymer particles having a substantially uniform particle size are prepared by suspending styrenic polymer particles having particle sizes in a certain range in water to provide an aqueous suspension and after adding to the suspension a styrenic monomer, a suspension polymerization catalyst and a polymerization retarder in an amount of 1/200 to 1/15 mole per 1 mole of the catalyst, conducting the suspension polymerization. By conducting the polymerization in the presence of a foaming agent, one can produce foamable styrenic polymer particles having a substantially uniform particle size.

REFERENCES:
patent: 2181102 (1939-01-01), Stoesser
patent: 2888410 (1959-05-01), Buchholz
patent: 2934530 (1960-04-01), Ballast
patent: 3265643 (1966-08-01), Hatano
patent: 3423351 (1969-01-01), Pierce
patent: 3440219 (1969-04-01), Wolff
patent: 3468820 (1969-09-01), Buchholz
patent: 3696172 (1972-10-01), Kaiho
patent: 3736273 (1973-05-01), Hatano
patent: 3960787 (1976-06-01), Isukamoto

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