Method for producing thermoplastic resin composition, thermoplastic resin composition and copier/printer exterior part

A method for producing a thermoplastic resin composition, the method comprising:

• melt-blending 50 to 80 parts by mass of a crystalline polyester resin and 20 to 50 parts by mass of an amorphous polyester resin with an extruder, thereby producing a first polyester resin compound;
• melt-blending 90 to 99 parts by mass of the crystalline polyester resin and 1 to 10 parts by mass of a styrene-acrylonitrile-glycidyl methacrylate terpolymer with the extruder used for producing the first polyester resin compound or a different extruder, thereby producing a second polyester resin compound;
• and
• compounding 1 to 10 parts by mass of the first polyester resin compound, 1 to 10 parts by mass of the second polyester resin compound, 10 to 90 parts by mass of a polycarbonate resin, 1 to 40 parts by mass of a flame retardant, 0.1 to 1 parts by mass of an antidrip agent, 0.1 to 1 parts by mass of an antioxidant, 0.1 to 2 parts by mass of a lubricant and 1 to 20 parts by mass of a toughening agent.