Glass fiber-reinforced poly(tetramethylene terephthalate) resin composition

A glass fiber-reinforced polyester resin composition consisting of:

• A. about 55 to about 95% by weight, based on the total weight of (A) and (B), of poly(tetramethylene terephthalate) resin composed of a dicarboxylic acid component unit at least 90 mole% of which consists of terephthalic acid and a glycol component unit at least 90 mole% of which consists of tetramethylene glycol,
• B. about 45 to about 5% by weight, based on the total weight of (A) and (B), of a copolyester resin composed of a dicarboxylic acid component unit at least 90 mole% of which consists of terephthalic acid and a unit of a mixed glycol consisting of an ether glycol of the formula HO(CH.sub.2 CH.sub.2 O).sub.n H wherein n is an integer of 2 to 6, and a monoalkylene glycol containing not more than 6 carbon atoms, the amount X in mole% of the ether glycol being expressed by the formula 12/n .ltoreq. X .ltoreq. 150/n wherein n is the same as defined above, and the amount of the monoalkylene glycol being (100 - X) mole%,
• C. about 10 to about 50 parts by weight, per 100 parts by weight of the sum of (A) and (B), of glass fibers, and
• D. up to about 50 parts by weight, per 100 parts by weight of the sum of (A) and (B), of an additive.