Process for producing extruded polystyrene foam products...

Details Process for producing extruded polystyrene foam products... Process for producing extruded polystyrene foam products...

C - Chemistry, Metallurgy

08

J

C08J 9/00 (2006.01) C08J 9/12 (2006.01) C08L 25/02 (2006.01)

Patent

CA 2344365

In one embodiment, the present invention relates to a process for preparing a foam product including the steps of (A) forming a foamable mixture of (1) an alkenyl aromatic polymer and (2) a blowing agent under a pressure sufficient to prevent prefoaming of the mixture and (B) foaming the mixture into a region of reduced pressure to form the foam product, wherein the difference between the glass transition temperature of the foamable mixture and the foaming temperature is less than about 62°C.

Dans un mode de réalisation, la présente invention concerne un procédé de préparation d'un produit en mousse comprenant les étapes consistant (A) à former un mélange expansible (1) d'un polymère alcényle aromatique et (2) d'un agent porogène sous une pression suffisante pour empêcher la prémoussage du mélange et (B) à mousser le mélange dans une région sous pression réduite pour former le produit de mousse, la différence entre la température de transition vitreuse du mélange expansible et la température de moussage étant inférieure à environ 62 DEG C.

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