WITH SILICON RUBBER TOUGHENED THERMOPLASTIC RESINS

摘要

A thermoplastic composition having a high impact strength is disclosed, said composition being prepared by (I) mixing, (A) a thermoplastic selected from a polyester resin or a polyamide resin, (B) a silicone component comprising; (B') a diorganopolysiloxane gum having a plasticity of at least 30 and having an average of at least 2 alkenyl radicals in its molecule and (B'') a fumed silica filler, (C) an organohydrido silicon compound which contains an average of at least 2 silicon-bonded hydrogen groups in its molecule, and (D) a hydrosilation catalyst, components (C) and (D) being present in an amount sufficient to cure said diorganopolysiloxane; and (II) dynamically curing said diorganopolysiloxane gum. When the above composition is based on preferred poly(butylene terephthalate) resins, molded components thereof exhibit an Izod impact strength of at least 14 ft-lb (747 J/m), this high impact strength also being realized by blending the poly(butylene terephathalate) resin with a polycarbonate resin, the fumed silica then being an optional component.