Flame retarded extruded polystyrene foams

摘要

The invention relates to flame retarded extruded polystyrene foams with a very low halogen content in the final product, i.e. containing a very low content of hexabromocyclododecane or preferably hexabromocyclododecane free, and a process for their preparation. The invention also relates to their use in construction, as building thermal insulating materials, or in transportation.

主权项

1. Flame retarded polystyrene compositions containing:
(A) at least a polystyrene crystal homopolymer, (B) at least an inorganic hypophosphite, (C) at least an halogen containing molecule or polymer, (D) at least an “organic synergic” or “radical initiator” (RI), wherein said polystyrene, after processing, has a weight average molecular weight (Mw) of at least 90% of the polystyrene in an identical composition without said compounds (B), (C) and (D) and wherein B), C) and D) together comprise between 0.5% and 3% by weight with respect to the total weight of the composition.