Glass fiber-reinforced polyester resin composition and molded product using the same

A glass fiber-reinforced polyester resin composition including:

• (A) about 30 to about 80 wt % of two or more kinds of polyester resin;
• (B) about 20 to about 70 wt % of a vinyl-based copolymer comprising an acrylic-based graft copolymer or a mixture of the acrylic-based graft copolymer and a copolymer of aromatic vinyl monomers and unsaturated nitrile monomers;
• and
• (C) about 10 to about 100 parts by weight of glass fiber, based on about 100 parts by weight of the total amount of the polyester resin (A) and the vinyl-based copolymer (B),
• wherein the polyester resin (A) includes polyethylene terephthalate resin having a crystallinity of about 40% to about 60% and polybutylene terephthalate resin;
• and
• wherein the polyester resin (A) includes about 10 to about 40% of the polyethylene terephthalate resin and about 60% to about 90% of the polybutylene terephthalate resin;
• wherein the acrylic-based graft copolymer is a copolymer in which a polymer of aromatic vinyl monometers and unsaturated nitrile monomers is grafted onto an acrylic-based rubber;
• and
• wherein the composition has a fluidity of 25 to 33 g/1 min measured in accordance with ASTM D1238 and a shrinkage ratio (TD) of 0.65 to 0.73%.