Silicone-acrylic impact modifier having improved colorability and thermoplastic resin composition comprising the same

A silicone-acrylic impact modifier having multi-layer structure, which is characterized by containing 1-40 weight % of a silicone rubber seed containing one or more vinyl copolymers;

• 20-80 weight % of an acrylic rubber core covering the silicone rubber seed;
• and 19-40 weight % of a shell containing one or more vinyl copolymers and covering the acrylic rubber core,
• wherein the silicone rubber seed is characterized by containing i) 0.1-10 weight % of one or more vinyl copolymers;
• ii) 50-94.9 weight % of a silicone rubber layer covering the vinyl copolymers;
• and iii) 5-40 weight % of an alkyl methacrylate monomer covering the silicone rubber layer
• wherein the vinyl copolymer of i) is one or more compounds having a glass transition temperature of at least room temperature and selected from the group consisting of an aromatic vinyl monomer of styrene, α-methyl styrene, p-methyl styrene, p-butyl styrene and 3,4-dichloro styrene;
• an alkyl acrylate of ethyl acrylate;
• an alkyl methacrylate of methyl methacrylate and glycidyl methacrylate;
• benzyl methacrylate;
• and a cyano vinyl monomer such as acrylonitrile and methacrylonitrile.