Thermoplastic resin composition and molded product thereof

A thermoplastic resin composition comprising:

• (A) aromatic polyamide comprising repeating units formed from:
• dicarboxylic acid constituent units comprising 40-100% by mol of terephthalic acid constituent units,
• 0-50% by mol of aromatic dicarboxylic acid constituent units other than terephthalic acid constituent units and/or
• 0-60% by mol of aliphatic dicarboxylic acid constituent units having 4 to 20 carbon atoms;
• and
• diamine constituent units comprising aliphatic diamine constituent units and/or
• alicyclic diamine constituent units, said aromatic polyamide having an intrinsic viscosity, as measured in a concentrated sulfuric acid at 30.degree. C., of 0.5 to 3.0 dl/g and a melting point of not lower than 280.degree. C.;
• (B) at least one polymer selected from the group consisting of
• a graft-modified product of a random copolymer comprising two different .alpha.-olefins, and
• a graft-modified product of an aromatic vinyl hydrocarbon/conjugated diene copolymer or a hydrogenation product thereof, wherein said graft-modified products are produced by grafting unmodified polymer with an unsaturated carboxylic acid or an unsaturated carboxylic acid derivative;
• (C) a hindered phenol antioxidant having a molecular weight of not less than 500 and a 10% weight loss temperature of not lower than 300.degree. C. in a thermogram measured in air;
• and
• (D) a sulfur antioxidant having a molecular weight of not less than 600 and a 10% weight loss temperature of not lower than 280.degree. C. in a thermogram measured in air represented by the following formula
• (R.sup.1 S--R.sup.2 --COOCH.sub.2).sub.4 C
• wherein R.sup.1 is a hydrocarbon group of 3 to 20 carbon atoms and R.sup.2 is a divalent hydrocarbon group of 1 to 5 carbon atoms;
• wherein the polymer component (B) is contained in an amount of 2 to 50 parts by weight based on 100 parts by weight of the polyamide (A);
• and wherein the total amount of the hindered phenol antioxidant (C) and the sulfur antioxidant (D) is in the range of 0.2 to 4 parts by weight based on the total amount of the polyamide (A) and the polymer (B).