Molding expandable styrene polymer particles

Details Molding expandable styrene polymer particles Molding expandable styrene polymer particles

1977-11-07

1978-09-12

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

260 4585B, 260 4595R, 260 4595H, 260 4575H, 260 4578T, 521 88, 521 93, 521146, 521147, C08V 918

Patent

active

041136721

ABSTRACT:
Expandable styrene polymer particles having reduced flammability are made by incorporating from 0.1 to 15 weight percent of non-polymeric organic halogen compounds into the polymer during impregnation of the polymer particles with a blowing agent in aqueous suspension. The addition of 0.001 to 0.5 weight percent of dialkyl tin maleates or fumarates during the impregnation step produces expandable styrene polymer particles with greatly improved molding characteristics such as reduced pruning tendency, increased mold fusion, and greater dimensional stability. Addition of a synergistic amount of 0.001 to 0.4 weight percent of a hindered phenolic antioxidant with the tin compounds gives improved molding characteristics with retention of polymer molecular weight.

REFERENCES:
patent: 2676927 (1954-04-01), McCurdy et al.
patent: 3058926 (1962-10-01), Eichhorn
patent: 3368916 (1968-02-01), Hattori

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