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Abstract

Disclosed herein is a thermoplastic resin composition which comprises: (a) a polyphenylene ether resin or a polyphenylene ether-containing resin composition, (b) a polypropylene grafted with a styrene-based monomer and/or a propylene copolymer grafted with a styrene-based monomer, (c) an ethylene-.alpha.-olefin copolymer grafted with a styrene-based monomer, said ethylene-.alpha.-olefin copolymer having a density of 0.85-0.91 g/cm.sup.3 and a maximum melting peak temperature of 100.degree. C. and above measured with a differential scanning calorimeter (DSC), and (d) optionally, rubbery substance. Also disclosed herein is a process for producing a thermoplastic resin composition which comprises incorporating a preblend composed of: (a') a polyphenylene ether resin or a polyphenylene ether-containing resin composition, (b') a polypropylene and/or a propylene copolymer, (c') an ethylene-.alpha.-olefin copolymer having a density of 0.85-0.91 g/cm.sup.3 and a maximum melting peak temperature of 100.degree. C. and above measured with a differential scanning calorimeter (DSC), and (d') optionally, a rubbery substance with a styrene-based monomer and an organic peroxide, followed by kneading with heating. The thermoplastic resin composition has good moldability and yields molded articles having well-balanced physical properties.

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First Claim