Acrylonitrile-acrylate-styrene graft copolymer and thermoplastic resin composition comprising thereof

An ASA graft copolymer composition comprising:

• an ASA graft copolymer comprising a seed, a core and a shell;
• and
• a matrix polymer, wherein a difference between a refractive index of the seed and a refractive index (μD25) of the matrix polymer is lower than 0.035,
• a difference between a refractive index of the shell, and a refractive index (μD25) of the matrix polymer is lower than 0.035,
• a difference between a refractive index of the core and a refractive index (μD25) of the matrix polymer is higher than 0.056, and
• the ASA graft copolymer satisfies the following Equations 1 and 2:
• 140<2*r2<380 Equation 1
• r2−r1<80 Equation 2
• wherein r1 represents a thickness (nm) from the center to the seed of the graft copolymer and R2 represents a thickness (nm) from the center to the core of the graft copolymer.