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

摘要

Disclosed are an acrylonitrile-acrylate-styrene graft copolymer having a structure including a seed which comprises at least one of an aromatic vinyl compound, a vinyl cyanide compound and an alkyl (meth)acrylate compound, a core which surrounds the seed and comprises alkyl acrylate, and a shell which surrounds the core and comprises at least one of an aromatic vinyl compound, a vinyl cyanide compound and an alkyl (meth)acrylate compound, and having suitably controlled thicknesses and refractive indexes of the respective layers, and a thermoplastic resin composition comprising the acrylonitrile-acrylate-styrene graft copolymer.

主权项

1. A graft copolymer composition comprising:
a 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 0.03, a difference between a refractive index of the shell, and a refractive index (μD25) of the matrix polymer is lower than 0.03, a difference between a refractive index of the core and a refractive index (μD25) of the matrix polymer is higher than 0.08, and the graft copolymer satisfies the following Equations 1 and 2:
200≦2*r2≦300  Equation 120≦r2−r1≦50  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, wherein the graft copolymer has a graft ratio higher than 25% and a gel content lower than 90%, and the graft copolymer comprises a styrene, vinyl toluene or styrene monomer derivative; an alkyl (meth)acrylate compound; and acrylonitrile, methacrylonitrile or a mixture thereof, and wherein a weight ratio of the seed to the core to the shell is 10 to 35:30 to 55:30 to 45.