Abstract: The polyester resin composition includes: a polyester resin A containing 82 to 88 mass % of a polybutylene terephthalate resin and 12 to 18 mass % of a polyethylene terephthalate resin; a metal organic acid salt B that is either one or both of an alkali metal organic acid salt and an alkaline earth metal organic acid salt; and an inorganic filler C having an average particle diameter of 0.05 to 3 ?m in an amount of 1 to 13 parts by mass based on 100 parts by mass of the polyester resin A, wherein the polyester resin composition includes either one or both of alkali metal atoms and alkaline earth metal atoms in an amount of 0.000005 to 0.05 parts by mass based on 100 parts by mass of the polyester resin A, and a content of linear oligomers of polybutylene terephthalate or the like is not more than 1000 mg/kg.

Abstract: The present invention relates to a polybutylene terephthalate resin composition comprising 20 to 50 mass % of a polybutylene terephthalate resin (A) having an intrinsic viscosity of 0.60 to 1.0 dl/g, 20 to 45 mass % of a fibrous filler (B), 1 to 20 mass % of a polycarbonate resin (C) having a melt volume rate (MVR) of 30 cm3/10 min or more, 3 to 20 mass % of a copolymerized polybutylene terephthalate resin (D), and 0 to 20 mass % of an inorganic filler (E) other than the fibrous filler (B). The polybutylene terephthalate resin composition can form a molding that remedies sink marks, maintains high heat deflection temperature, and has excellent appearance.

Abstract: The present invention relates to a polyester resin composition comprising 18 to 35 parts by mass of a polybutylene terephthalate resin (A), 10 to 25 parts by mass of a polyethylene terephthalate resin (B), 10 to 20 parts by mass of a thermoplastic polyester elastomer (C), 0.5 to 5 parts by mass of an epoxy group-containing ethylene copolymer (D), 12 to 20 parts by mass of a spherical and/or amorphous inorganic filler (E), 10 to 35 parts by mass of a glass fiber reinforcing material (F), 0 to 10 parts by mass of a polycarbonate resin (G), and 0 to 2 parts by mass of a transesterification inhibitor (H). The polyester resin composition is excellent in heat resistance, capable of imparting toughness to a molding while remedying sink marks.

Abstract: The polyester resin composition includes: a polyester resin A containing 82 to 88 mass % of a polybutylene terephthalate resin and 12 to 18 mass % of a polyethylene terephthalate resin; a metal organic acid salt B that is either one or both of an alkali metal organic acid salt and an alkaline earth metal organic acid salt; and an inorganic filler C having an average particle diameter of 0.05 to 3 ?m in an amount of 1 to 13 parts by mass based on 100 parts by mass of the polyester resin A, wherein the polyester resin composition includes either one or both of alkali metal atoms and alkaline earth metal atoms in an amount of 0.000005 to 0.05 parts by mass based on 100 parts by mass of the polyester resin A, and a content of linear oligomers of polybutylene terephthalate or the like is not more than 1000 mg/kg.