Gentle recycling of styrene polymers

Details Gentle recycling of styrene polymers Gentle recycling of styrene polymers

C - Chemistry, Metallurgy

08

J

C08J 11/06 (2006.01) C08K 5/34 (2006.01) C08K 5/3415 (2006.01)

Patent

CA 2157604

A process for non-modifying recycling of styrene polymers, comprising the steps: a) melting the possibly finely reduced styrene polymers in an extruder, and b) extruding the melt thus obtained, to which expanding agents and/or the usual additives may be added, in which melting is performed in the presence of 0.01 to 4 wt % in relation to the styrene polymer of bismaleic imides, trismaleic imides and/or maleic imides with more than three imide groups.

L'invention concerne un procédé permettant de recycler des polymérisats de styrène sans les altérer, qui comprend les étapes suivantes: a) fusion dans une extrudeuse des polymérisats de styrène éventuellement pulvérisés et b) extrusion de la matière fondue obtenue, à laquelle on peut éventuellement ajouter des agents porogènes et/ou des additifs classiques. La fusion s'effectue en présence de 0,01 à 4 % en poids, par rapport au polymérisat de styrène, d'imides bismaléiques, d'imides trismaléiques et/ou d'imides maléiques ayant plus de trois groupes imide.

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