Process for controlling the particle size in the preparation of

Details Process for controlling the particle size in the preparation of Process for controlling the particle size in the preparation of

1991-07-05

1993-02-23

Teskin, Fred

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521146, 521147, 526 87, C08J 920

Patent

active

051890690

ABSTRACT:
Expandable styrene polymer of controlled particle size is prepared by polymerizing styrene and optionally polymerizable comonomers in a stirred aqueous suspension in the presence of monomer-soluble free radical initiator and dispersant to the extent that at least 70%, based on the total monomer, of the monomers are polymerized in the aqueous suspension initially to a conversion of at least 70% by weight; and then adding the remaining monomer, initiator and optional copolymerizable monomer and additives to the polymerization medium over one to three hours.

REFERENCES:
patent: 3657162 (1972-04-01), Finestone et al.
patent: 4137388 (1979-01-01), Cutter
patent: 4174425 (1979-11-01), Saito et al.
patent: 4404338 (1983-09-01), DeToffol et al.
patent: 4489058 (1984-12-01), Lay et al.

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