Styrenic polymer foam with comonomer content

Details Styrenic polymer foam with comonomer content Styrenic polymer foam with comonomer content

C - Chemistry, Metallurgy

08

J

C08J 9/12 (2006.01) C08F 212/08 (2006.01) C08L 25/08 (2006.01)

Patent

CA 2164327

Disclosed is a process for making a styrenic polymer foam structure, comprising: a) heating a styrenic polymer material comprising greater than 50 percent by weight styrenic monomeric units and 0.1 to 40 percent by weight of oxygen-containing units based upon the total weight of the styrenic polymer material to form a melt polymer material; and b) incorporating into the melt polymer material a blowing agent comprising 5 weight percent or more carbon dioxide based upon the total weight of the blowing agent. Further disclosed is a foam structure obtainable according to the above process. The oxygen-containing comonomer content in the styrenic polymer material enables process operating pressures to be significantly reduced when using carbon dioxide as a blowing agent compared to a styrenic polymer material without comonomer content. The foam structure formed is of low density and of good quality.

Procédé de fabrication d'un polystyrène expansé consistant: a) à chauffer un polystyrène comportant plus de 50 % en poids d'unités styrène, et 0,1 à 40 % en poids d'unités monomères oxygénés pourcentages basés sur le poids total de la matière polymère styrénique pour former une matière polymère en fusion; b) à incorporer au polymère en fusion un agent porogène composé d'au moins 5 % en poids (de l'agent d'expansion) de gaz carbonique. L'invention porte également sur une structure de matériau expansé obtenue par ledit procédé. Le contenu du polystyrène expansé en comonomères oxygénés a pour effet de réduire sensiblement les pressions pendant le processus de fabrication (utilisant du gaz carbonique comme agent porogène), par rapport à ce qu'elles sont lorsqu'on emploie un polystyrène sans adjonction de comonomères. La structure de la mousse se caractérise par sa faible densité et sa bonne qualité.

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