Thermoplastic resin composition and article produced therefrom

A thermoplastic resin composition comprising:

• about 10 wt % to about 30 wt % of a first rubber-modified vinyl graft copolymer obtained by grafting a monomer mixture comprising an aromatic vinyl monomer and a vinyl cyanide monomer to a diene rubber polymer;
• about 1 wt % to about 15 wt % of a second rubber-modified vinyl graft copolymer obtained by grafting a monomer mixture comprising an aromatic vinyl monomer and a vinyl cyanide monomer to an acrylate rubber polymer;
• about 10 wt % to about 40 wt % of a first aromatic vinyl-vinyl cyanide copolymer having a weight average molecular weight of about 250,000 g/mol to about 450,000 g/mol and including about 25 wt % to about 31 wt % of a repeat unit derived from a vinyl cyanide monomer;
• about 20 wt % to about 60 wt % of a second aromatic vinyl-vinyl cyanide copolymer having a weight average molecular weight of about 70,000 g/mol to about 150,000 g/mol and including about 33 wt % to about 42 wt % of a repeat unit derived from a vinyl cyanide monomer;
• and
• 5 wt % to about 15 wt % of a third aromatic vinyl-vinyl cyanide copolymer having a weight average molecular weight of about 70,000 g/mol to about 150,000 g/mol and including about 25 wt % to about 31 wt % of a repeat unit derived from a vinyl cyanide monomer, each based on 100 wt % of the thermoplastic resin composition,
• wherein the thermoplastic resin composition has a fracture strain ratio ε1/ε0 of about 65% to about 90%, as measured in accordance with ASTM D543-06 using a 3.2 mm thick specimen, wherein ε1 is fracture strain measured when the specimen not exposed to a chemical reagent is subjected to tensile testing and ε0 is fracture strain measured when the specimen exposed to a chemical reagent is subjected to tensile testing, wherein tensile testing is conducted at a tensile rate of 5 mm/min in accordance with ASTM D638.