Steam expanded polymeric composition and method

Details Steam expanded polymeric composition and method Steam expanded polymeric composition and method

C - Chemistry, Metallurgy

08

J

18/650, 403/72

C08J 9/14 (2006.01)

Patent

CA 1271595

Abstract of the Disclosure A steam expanded alkenyl aromatic polymer composition is provided. The polymer is mixed with a volatile blowing agent containing, as a primary blowing agent, dichlorodifluoromethane and as a secondary blowing agent, a halogenated hydrocarbon, a hydrocarbon, or an aliphatic alcohol containing from 1 to 4 carbon atoms. The secondary blowing agent has a normal atmospheric boiling point of from 0° to 100°C. The admixture of polymer and blowing agent may be expanded by steam immediately after extrusion foaming or may be expanded after aging of the composition which has been impregnated with the volatile blowing agent.

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