| 摘要 |
PURPOSE: A thermoplastic polyamide resin composition is provided to improve the heat resistance, the impact resistance, the resistance against drop weight impact and the mechanical strength and to reduce the molding shrinkage rate. CONSTITUTION: The thermoplastic polyamide resin composition comprises 50-90 wt% of a polyamide resin; 1-30 wt% of a modified aromatic vinyl-based compound/maleimide copolymer; 1-20 wt% of a thermoplastic elastomer; 0-20 wt% of an aromatic vinyl-based compound/maleimide/vinyl cyanide copolymer; and 0-20 wt% of an aromatic vinyl-based copolymer. Preferably the modified aromatic vinyl-based compound/maleimide copolymer comprises 30-80 wt% of an aromatic vinyl-based compound; 30-80 wt% of maleimide having the repeating unit represented by the formula 1; 0.1-10 wt% of an unsaturated dicarboxylic acid or unsaturated dicarboxylic anhydride; and 0-40 wt% of other vinyl compounds copolymerizable with the aromatic vinyl-based compound. In the formula 1, R1 and R2 are H, a halogen atom or an alkyl group, respectively; and R3 is H, an alkyl group, an aromatic group or an aryl group.
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