A process for producing thermoformable foam sheet using a...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 9/12 (2006.01) B29C 44/56 (2006.01)

Patent

CA 2399438

The present invention is a process for producing a thermoplastic foam sheet comprising contacting a molten monovinylidene aromatic or olefinic polymer with a physical blowing agent to form a polymer/blowing agent mixture, and foaming the mixture into a region of lower pressure within a sheet extrusion line, wherein the extrudate is pulled and compressed to form a thermoplastic foam sheet having a uniform thickness of less than 3 mm.

L'invention concerne un procédé servant à produire une feuille de mousse thermoplastique et consistant à mettre en contact un polymère aromatique ou oléfinique de monovinylidène en fusion avec un agent soufflant physique, de manière à obtenir un mélange constitué par le polymère et l'agent soufflant, et à faire mousser ce mélange dans une zone de pression plus basse à l'intérieur d'une ligne d'extrusion de feuilles, l'extrudat étant soumis à une traction et à une compression dans cette ligne afin d'obtenir une feuille de mousse thermoplastique dont l'épaisseur uniforme est inférieure à 3 mm.

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