Patent ID: 9695295
Date: 2017-07-04
CPC Classifications: C08J,C08K,C09D

Claim:
1. A composition, based on a self-extinguishing expandable vinyl aromatic polymer in granules, the composition consisting of: a polymeric matrix produced by a mass polymerization or a continuous mass polymerization process, comprising 50-100% by weight of a vinyl aromatic monomer and 0-50% by weight of a copolymerizable monomer; and homogeneously englobed in the polymeric matrix; 3-10% by weight, calculated with respect to the polymeric matrix, of an expanding system consisting of at least one substance selected from the group consisting of aliphatic or cyclo-aliphatic hydrocarbons containing 3-6 carbon atoms, halogenated derivatives of an aliphatic hydrocarbons containing 1-3 carbon atoms, and carbon dioxide; 0.005-5% by weight, calculated with respect to the polymeric matrix, of a brominated flame-retardant comprising a brominated hydrocarbon comprising at least 30% by weight of bromine; 0.001-2% by weight, calculated with respect to the polymeric matrix, of a synergic additive of the brominated flame-retardant comprising a C—C or C—O—O—C thennolabile bond; and 0.005-5% by weight, calculated with respect to the polymeric matrix, of a first additive, wherein the first additive is capable of regulating cell structure after expansion of the granules and inhibiting thermal degradation of the brominated flame-retardant, and wherein the first additive is a partially or completely salified polycarboxylic acid.