Horishirokisan * horikaaboneetoburotsukukyojugotaiokippontoshitanetsukasoseiseikeiyososeibutsu

摘要

PURPOSE: To provide a thermoplastic molding composition which contains a polydiorganosiloxane/polycarbonate block copolymer, an elastic copolymer and, optionally, a polyalkylene terephthalate and which excels in thermal deformation resistance and toughness at low temperature. ;CONSTITUTION: This composition contains (A) 10-98 parts by weight (hereinafter referred to as part), preferably, 30-90 parts of a polydiorganosiloxane/ polycarbonate block copolymer having an average molecular weight of 10000-200000 and containing 75-97.5 wt.% (hereinafter referred to as %) of aromatic carbonate unit and 25-2.5% of polyorganosiloxane unit, which contains α,ω-bishydroxyaryloxy terminal group and is manufactured from a polydiorganosiloxane having a polymerization degree of 5-100, (B) 1-30 parts, preferably, 5-20 parts of an elastic polymer (e.g.; EPDM) having a glass transition point of -20°C or lower and, preferably, a gel content of 20% or more, and (C) 0-50 parts of a thermoplastic polyalkylene terephthalate.;COPYRIGHT: (C)1990,JPO