COMPOSITIONS HAVING IMPROVED IGNITION RESISTANCE

The present invention relates to composition having improved ignition resistance. The interpolymer compositions comprise: (A) from 5 to 90 percent by weight of at least one substantially random interpolymer prepared by polymerizing ethylene and/or one or more alpha -olefin monomers with one or more vinyl or vinylidene aromatic monomers, and optionally with other polymerizable ethylenically unsaturated monomer(s); (B) from 10 to 94.9 percent by weight of at least one filler selected from ammonium polyphosphate, magnesium hydroxide, calcium hydroxide, and aluminum trihydrate; and (C) one or more components selected from the group consisting of (1) 5 to 50 percent by weight of at least one filler selected from talc, calcium carbonate, glass fibers, marble dust, cement dust, clay, feldspar, silica or glass, fumed silica, silicates, alumina, magnesium oxide, antimony oxide, zinc oxide, barium sulfate, aluminum silicate, calcium silicate, titanium oxides, glass microspheres, mica, clays, wollastonite, and chalk; (2) 0.5 to 20 percent by weight of at least one metal borate selected from the metal borate of Group IIA, and, optionally, 0.5 to 10 percent by weight of at least one processing aid selected from the group consisting of polydimethylsiloxane, organopolysiloxanes, tartaric acid, stearic acid, zinc stearic, waxes, and high melt flow polyolefins; (3) 0.1 to 15 percent by weight of at least one initiator or at least one coupling agent selected from the group consisting of organic peroxides, silanes, titanates, zirconates, multifunctional vinyl compounds and organic azides; (4) 0.1 to 20 percent by weight of at least one hindered amine stabilizer; wherein the amounts of (A), (B) and (C) are based on the total weight of (A), (B) and (C). La présente invention concerne des compositions présentant une résistance améliorée à l'inflammation. Ces compositions interpolymères comprennent: (A) de 5 à 90 % en poids d'au moins un interpolymère sensiblement aléatoire obtenu par polymérisation d'éthylène et/ou d'un ou de plusieurs alpha -oléfine monomères avec un ou plusieurs monomères aromatiques de vinyle ou de vinylidène, et, éventuellement, d'autres monomères polymérisables insaturés ethyléniquement; (B) de 10 à 94,9 % en poids d'au moins une charge prise parmi un polyphosphate d'ammonium, un hydroxyde de magnésium, un hydroxyde de calcium et un trihydrate d'aluminium; et (C) un ou plusieurs composants pris dans le groupe comprenant (1) de 5 à 50 % en poids d'au moins