Expandable styrene-maleic anhydride copolymer particles and...

Details Expandable styrene-maleic anhydride copolymer particles and... Expandable styrene-maleic anhydride copolymer particles and...

C - Chemistry, Metallurgy

08

J

18/645, 403/67,

C08J 9/18 (2006.01) B32B 5/20 (2006.01) C08F 8/14 (2006.01) C08F 8/30 (2006.01)

Patent

CA 1141900

ABSTRACT OF THE DISCLOSURE An expandable styrene-maleic anhydride copolymer particle comprising the reaction product of a styrene-maleic anhydride copolymer comprising from 2 to 25 weight percent of maleic anhydride and having an average degree of polymerization of from 500 to 4,000 with a hydroxy compound having from 2 to 4 active hydroxy groups and from 2 to 15 carbon atoms, wherein the mole ratio of the hydroxy compound is from 2.5 to 150 mole percent relative to the maleic anhydride and, wherein the reaction product is impregnated with a volatile blowing agent. A bead molding process for preparing foams from these expandable particles is also disclosed.

351379

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