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

A thermoplastic resin composition, comprising:

• an alkyl acrylate-aromatic vinyl compound-vinyl cyanide compound graft copolymer (A) comprising a seed obtained by polymerizing 35 to 58% by weight of an alkyl acrylate and 42 to 65% by weight of an aromatic vinyl compound, a rubber core formed to surround the seed and obtained by polymerizing 78 to 91% by weight of an alkyl acrylate and 9 to 22% by weight of an aromatic vinyl compound, and a graft shell formed to surround the rubber core and obtained by polymerizing 65 to 82% by weight of an aromatic vinyl compound, 12 to 30% by weight of a vinyl cyanide compound, and 3 to 15% by weight of an alkyl acrylate;
• and
• a non-graft copolymer (B) comprising an alkyl (meth)acrylate, an alkyl-substituted styrene-based compound, and a vinyl cyanide compound,
• wherein the graft copolymer (A) satisfies both Equations 1 and 2 below:
• 180
• ≤
• 2
• *
• r
• ⁢
• 2
• ≤
• 300
• [
• Equation
• ⁢
• 1
• ]
• 25
• ≤
• r
• ⁢
• 2
• -
• r
• ⁢
• 1
• ≤
• 45
• ,
• [
• Equation
• ⁢
• 2
• ]
• wherein, in Equations 1 and 2, r1 is a thickness (nm) from a center of the graft copolymer to the seed, and r2 is a thickness (nm) from a center of the graft copolymer to the core.

A method of preparing a thermoplastic resin composition, comprising kneading and extruding, at 180 to 300° C. and 80 to 400 rpm, an alkyl acrylate-aromatic vinyl compound-vinyl cyanide compound graft copolymer (A) comprising a seed obtained by polymerizing 35 to 58% by weight of an alkyl acrylate and 42 to 65% by weight of an aromatic vinyl compound, a rubber core formed to surround the seed and obtained by polymerizing 78 to 91% by weight of an alkyl acrylate and 9 to 22% by weight of an aromatic vinyl compound, and a graft shell formed to surround the rubber core and obtained by polymerizing 65 to 82% by weight of an aromatic vinyl compound, 12 to 30% by weight of a vinyl cyanide compound, and 3 to 15% by weight of an alkyl acrylate;

• and a non-graft copolymer (B) comprising an alkyl (meth)acrylate, an alkyl-substituted styrene-based compound, and a vinyl cyanide compound, wherein the graft copolymer (A) satisfies both Equations 1 and 2 below:
• 180
• ≤
• 2
• *
• r
• ⁢
• 2
• ≤
• 300
• [
• Equation
• ⁢
• 1
• ]
• 25
• ≤
• r
• ⁢
• 2
• -
• r
• ⁢
• 1
• ≤
• 45
• ,
• [
• Equation
• ⁢
• 2
• ]
• wherein, in Equations 1 and 2, r1 is a thickness (nm) from a center of the graft copolymer to the seed, and r2 is a thickness (nm) from a center of the graft copolymer to the core.