IMPACT VISCOSITY-MODIFIED FIRE-RESISTANT POLYCARBONATE COMPOSITIONS Russian patent published in 2012 - IPC C08L69/00 C08L51/04 C08K3/34 C08K3/38 C08K5/523 

FIELD: chemistry.

SUBSTANCE: composition contains the following in pts.wt: A) 40-95 branched aromatic polycarbonate and/or branched aromatic polyether polycarbonate; B) 1-25 graft copolymer; C) 9-18 talc; D) 0.4-20 bisphenol A based oligophosphate as a phosphorus-containing fire retardant; E) 1-6 one or more inorganic boron compounds selected from Zn₄B₂O₇·H₂O, Zn₂B₆O₁₁·3.5H₂O and/or ZnB₄O₇·4H₂O and F) 0-3 polytetrafluoroethylene as an agent for preventing formation of droplets. 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 copolymerisation bases selected from silicone rubber (B.2.1) and silicone-acrylate rubber (B.2.2), wherein the base has glass transition temperature lower than 10°C.

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

12 cl, 1 tbl, 7 ex