Process of preparing styrenic polymer foams

Details Process of preparing styrenic polymer foams Process of preparing styrenic polymer foams

1978-01-11

1979-11-13

Henderson, C. A.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521146, 521147, 526200, 526206, 526207, 526201, 526209, 526210, C08J 902

Patent

active

041744250

ABSTRACT:
In a suspension polymerization process of preparing styrenic polymer particles from a styrenic monomer and small particles of a styrenic polymer in a definite particle size range, styrenic polymer particles having a uniform particle size are obtained without the formation of fine polymer powders by simultaneously but separately dropwise adding to an aqueous suspension of the small particles of the styrenic polymer (1) a solution of 100-60% by weight of a suspension polymerization catalyst and 1-10% by weight of the styrenic monomer and (2) a solution of 0-40% by weight of the catalyst and 99-90% by weight of the styrenic monomer simultaneously but separately from each other.

REFERENCES:
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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