Thermoplastic resin composition, method of preparing the same, and molded article manufactured using the same

A method of preparing a thermoplastic resin composition, the method comprising:

• kneading and extruding, under conditions of 200 to 330° C. and 100 to 500 rpm, 100 parts by weight of a base resin consisting of an acrylate-aromatic vinyl compound-vinyl cyanide compound graft copolymer (A-1) containing acrylate rubber having an average particle diameter of 0.05 to 0.15 μm as a core, an acrylate-aromatic vinyl compound-vinyl cyanide compound graft copolymer (A-2) containing acrylate rubber having an average particle diameter of 0.3 to 0.6 μm as a core, an aromatic vinyl polymer (B-1), and a heat-resistant aromatic vinyl polymer (B-2);
• and 0.5 to 10 parts by weight of a polyolefin elastomer (C),
• wherein the thermoplastic resin composition has a heat deflection temperature (HDT) of 89° C. or more.

A thermoplastic resin composition, comprising:

• 100 parts by weight of a base resin consisting of 1 to 30% by weight of an acrylate-aromatic vinyl compound-vinyl cyanide compound graft copolymer (A-1) containing acrylate rubber having an average particle diameter of 0.05 to 0.15 μm as a core, 5 to 50% by weight of an acrylate-aromatic vinyl compound-vinyl cyanide compound graft copolymer (A-2) containing acrylate rubber having an average particle diameter of 0.3 to 0.6 μm as a core, 40 to 85% by weight of an aromatic vinyl polymer (B-1), and 5 to 50% by weight of a heat-resistant aromatic vinyl polymer (B-2);
• and
• 0.5 to 10 parts by weight of a polyolefin elastomer (C).