Method of manufacturing polystyrene foam with polymer...

Details Method of manufacturing polystyrene foam with polymer... Method of manufacturing polystyrene foam with polymer...

C - Chemistry, Metallurgy

08

J

C08J 9/228 (2006.01) C08J 3/20 (2006.01) C08J 9/12 (2006.01) C08K 5/10 (2006.01) C08L 25/06 (2006.01)

Patent

CA 2626307

Disclosed is a method for making polystyrene foam which utilizes one or more atmospheric gases, particularly CO2, as the blowing agent in combination with a polymer processing aid (PPA), typically an ester that is relatively non- volatile at the extrusion temperature range. The blowing agent and the PPA may both be introduced into the molten thermoplastic polystyrene resin or the PPA may be incorporated in the solid source polystyrene resins. The resulting foam will be substantially free of residual blowing agent and dimensionally stable at ambient temperatures.

La présente invention se rapporte à un procédé permettant de fabriquer une mousse de polystyrène, qui fait appel à un agent gonflant se présentant sous la forme d'un ou plusieurs gaz atmosphériques, en particulier de CO2, ainsi qu'à un auxiliaire de traitement de polymères (PPA), en général un ester qui est relativement non volatile dans la fourchette de températures d'extrusion. L'agent gonflant et le PPA peuvent être tous deux introduits dans la résine de polystyrène thermoplastique fondue, ou le PPA peut être incorporé dans la résine de polystyrène source solide. La mousse obtenue est sensiblement exempte d'agent gonflant résiduel et présente une stabilité dimensionnelle satisfaisante à température ambiante.

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