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A highly crystalline polyethylene terephthalate resin composition comprising (A) 100 parts by weight of a polyethylene terephthalate copolymer comprising ethylene terephthalate units as the main recurring units, which is formed by copolymerizing a glycol component containing 1 to 20% by weight of a

A highly crystalline polyethylene terephthalate resin composition comprising (A) 100 parts by weight of a polyethylene terephthalate copolymer comprising ethylene terephthalate units as the main recurring units, which is formed by copolymerizing a glycol component containing 1 to 20% by weight of a polyalkylene glycol having an average molecular weight of 500 to 20,000 and 1.2 to 15% by weight of diethylene glycol with a carboxylic acid component composed mainly of terephthalic acid, (B) 5 to 200 parts by weight of a fibrous reinforcer, (C) 0.5 to 130 parts by weight of a nucleating agent, and (D) 0.1 to 60 parts by weight of a crystallization-promoting agent. The resin composition optionally contains 2 to 100 parts by weight of an inorganic compound, 2 to 100 parts by weight of an impact strength improver, 2 to 40 parts by weight of a flame retardant, or 1 to 20 parts by weight of a flame retardant assistant. The resin composition has an improved impact strength, a high heat distortion temperature, and an excellent moldability, and gives a molded article having a good surface appearance even when molding is carried out at a low mold temperature.

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A polyethylene terephthalate resin composition comprising: (A) 100 parts by weight of a polyethylene terephthalate copolymer comprising ethylene terephthalate units as the main recurring units, said copolymer being formed by copolymerizing a carboxylic acid component containing primarily terephthali

A polyethylene terephthalate resin composition comprising: (A) 100 parts by weight of a polyethylene terephthalate copolymer comprising ethylene terephthalate units as the main recurring units, said copolymer being formed by copolymerizing a carboxylic acid component containing primarily terephthalic acid with a glycol component containing from 1 to 20% by weight, based on the weight of the copolymer, of a polyalkylene glycol having an average molecular weight of 500 to 20,000 and from 1.2 to 15% by weight, based on the weight of the copolymer, of diethylene glycol; (B) from 5 to 200 parts by weight of a fibrous reinforcer; (C) from 0.5 to 130 parts by weight of a nucleating agent; and (D) from 0.1 to 60 parts by weight of a crystallization-promoting agent.