Thermoplastic resin composition, manufacturing method of thermoplastic resin composition, molded product and manufacturing method of molded product

A method of manufacturing a thermoplastic resin composition, comprising:

• a process of obtaining a graft copolymer (A) by graft copolymerization of a monomer mixture (a) including at least an aromatic vinyl monomer (a1) and a (meth)acrylate monomer (a2), but does not contain a vinyl cyanide monomer (a3), in the presence of a rubbery polymer (r) having a refractive index of not lower than 1.510 and not higher than 1.520;
• a process of obtaining a vinyl copolymer (B) by copolymerization of a monomer mixture (b) including at least an aromatic vinyl monomer (b1), a (meth)acrylate monomer (b2), and a vinyl cyanide monomer (b3);
• and
• a process of blending the graft copolymer (A) with the vinyl copolymer (B), wherein
• an acetone insoluble component (C) of the thermoplastic resin composition does not contain a vinyl cyanide monomer-derived unit,
• an acetone soluble component (D) of the thermoplastic resin composition contains the vinyl cyanide monomer-derived unit,
• a content of the vinyl cyanide monomer-derived unit is not lower than 2% by mass and not higher than 14% by mass relative to 100% by mass of the acetone soluble component (D),
• a dimethyl sulfoxide soluble component (E) of the thermoplastic resin composition contains the vinyl cyanide monomer-derived unit,
• in the dimethyl sulfoxide soluble component (E), a rate of a triad having all positions occupied by the vinyl cyanide monomer-derived unit to a total number of triads having a center position occupied by the vinyl cyanide monomer-device unit is lower than 1%, and
• a difference in refractive index between a graft acetone insoluble component of the graft copolymer (A) and the rubbery polymer (r) is not higher than 0.03 and a difference in refractive index between the vinyl copolymer (B) and the rubbery polymer (r) is not higher than 0.03.