Thermoplastic resin composition

A thermoplastic resin composition comprising:

• a graft copolymer, which is prepared by graft-polymerizing an aromatic vinyl-based monomer and a vinyl cyan-based monomer onto an acrylic rubber polymer;
• a first matrix copolymer, which includes a C1-C3alkyl (meth)acrylate-based monomer unit, an aromatic vinyl-based monomer unit and a vinyl cyan-based monomer unit;
• a second matrix copolymer, which includes a C1-C3alkyl (meth)acrylate-based monomer unit, an aromatic vinyl-based monomer unit and a vinyl cyan-based monomer unit;
• and
• an additive, which includes a polymer including a C1-C3alkyl (meth)acrylate-based monomer unit,
• wherein the first matrix copolymer and the second matrix copolymer have different weight-average molecular weights, and
• wherein the thermoplastic resin composition comprises, with respect to 100 parts by weight of the sum of the graft copolymer, the first matrix copolymer and the second matrix copolymer, the additive in an amount of 0.1 part by weight to less than 5.0 parts by weight.