Foaming method

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 9/00 (2006.01) C08J 9/14 (2006.01) C08J 9/34 (2006.01) C08L 25/04 (2006.01) C08L 25/06 (2006.01) C08L 33/06 (2006.01)

Patent

CA 2192169

A process for forming a foamed article having a closed cell structure without the need to use a halogenated blowing agent. In the process, a polymer blend comprising at least 50 % by weight of a styrenic polymer and up to 50 % by weight of an acrylic polymer which has an average molecular weight which is less than 90 % of that of the styrenic polymer and a hydrocarbon blowing agent are supplied to a heated extruder where the blend is formed and the blowing agent incorporated to form a molten mixture from which the foamed article is formed on release from the extruder.

Procédé de préparation d'articles en mousse possédant une structure cellulaire fermée sans qu'il soit nécessaire d'utiliser un agent gonflant halogéné. Ce procédé consiste à effectuer l'apport dans une extrudeuse réchauffée d'un mélange de polymères composé au moins de 50 % en poids d'un polymère styrénique et de 50 % en poids maximum d'un polymère acrylique, dont le poids moléculaire moyen est inférieur à 90 % de celui du polymère styrénique, ainsi que d'un agent gonflant à base d'hydrocarbures, le mélange étant réalisé dans ladite extrudeuse et l'agent gonflant incorporé, afin d'obtenir un mélange fondu à partir duquel on retire l'article en mousse à la sortie de l'extrudeuse.

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