FIRE-RETARDANT POLYCARBONATE COMPOSITIONS WITH MODIFIED IMPACT STRENGTH Russian patent published in 2012 - IPC C08L69/00 C08L51/04 C08K5/34 C08K5/523 B29C51/02 

FIELD: chemistry.

SUBSTANCE: composition contains the following in pts.wt: A) 40-78 branched aromatic polycarbonate and/or branched aromatic polyether carbonate; B) 1-25 graft copolymer; C) 9-18 talc; D) 11-20 oligophosphate based on bisphenol A as phosphorus-containing fire-retardant agent; E) 0-3 polytetrafluoroethylene as an additive for preventing droplet formation, and F) 0-1.5 thermoplastic vinyl (co)polymer and/or polyalkylene terephthalate. Copolymer (B) is obtained from B.1) 5-95 wt % one or more vinyl monomers per B.2) 95-5 wt % one or more graft bases selected from silicon rubber (B.2.1) and silicon-acrylate rubber (B.2.2), wherein the graft base has glass transition temperature lower than 10°C.

EFFECT: invention enables to obtain a composition with excellent fire resistance and high heat resistance, meets high fire-prevention technical requirements according to ASTM E162 and ASTM E662 standards.

11 cl, 1 tbl, 20 ex