Method for producing expandable polystyrene

Details Method for producing expandable polystyrene Method for producing expandable polystyrene

C - Chemistry, Metallurgy

08

J

C08J 9/16 (2006.01) B29C 44/34 (2006.01)

Patent

CA 2488507

The invention relates to a method for producing expandable polystyrene with a molecular weight Mw in excess of 170,000 g/mol. According to the invention, a styrene polymer melt containing an expanding agent and having a temperature of at least 120 ~C is passed through a spinneret comprising bores, whose diameter at the spinneret exit measures a maximum 1.5 mm, and is then granulated. The invention also relates to expandable styrene polymers (EPS) with a molecular weight Mw of more than 170,000 g/mol and between 0.05 and 1.5 wt. % inherent moisture.

L'invention concerne un procédé pour produire des polymères de styrol pouvant être expansés, dont le poids moléculaire M¿w? est supérieur à 170.000 g/mol. Selon l'invention, on fait passer une masse polymérique fondue de styrol contenant un agent propulseur et ayant une température d'au moins 120 ·C à travers un corps de filière doté d'orifices dont le diamètre en sortie de filière ne dépasse pas 1,5 mm, puis on granule cette masse. La présente invention porte également sur des polymères de styrol (EPS) pouvant être expansés, dont le poids moléculaire M¿w? est supérieur à 170.000 g/mol et l'humidité inhérente varie entre 0,05 et 1,5 % en poids.

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