Impregnation suspension system for expandable styrene/maleic anh

Details Impregnation suspension system for expandable styrene/maleic anh Impregnation suspension system for expandable styrene/maleic anh

1984-12-10

1985-10-15

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 56, C08J 918

Patent

active

045475270

ABSTRACT:
The absorption of water by styrene/maleic anhydride copolymer particles during the impregnation of the particles in aqueous suspension is greatly reduced by the addition of salt to the impregnation system.
This process produces expandable particles of non-equimolar copolymers of styrene and maleic anhydride having considerable less heterogeneity, finer cell structure, greater expandability, less heat sensitivity, less shrinkage, and lower density potential on molding.

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