| abstract |
The present invention relates to a method for preparing an ASA-based graft copolymer, a thermoplastic resin composition comprising the same, and a method for manufacturing a molded product. More specifically, an emulsifier is injected in a specific amount range in a seed preparation step, and a multifunctional carboxylic acid of at least 20 carbon atoms or a salt thereof are introduced as an emulsifier in a shell preparation step such that the thermal stability of the ASA-based graft copolymer can improve, and provided is a high-quality thermoplastic resin composition containing the same, thereby having a greatly reduced amount of gas generation, which occurs on the surface of a resin during a high-temperature thermoforming process, while having excellent impact resistance with respect to impact strength, tensile strength and the like, and an excellent exterior quality with respect to surface gloss, whiteness, thermal discoloration retention and the like. |