| 摘要 |
PURPOSE: A polyester resin composition is provided to improve strength and repeating cycle performance in a weld-line which is generated in a molded product of PBT glass-reinforced fiber with quick crystallization rate. CONSTITUTION: A polyester resin composition comprises 100.0 parts by weight of polybutylene terephthalate resin, 20-50 parts by weight of polyethylene terephthalatten, 70-130 parts by weight of glass fiber, and 3-15 parts by weight of random ehthylene-methyacrylate-glycidylmethacrylate terpolymer comprising a unit structure in chemical formula 1. In chemical formula 1, R is hydrogen, an alkyl group, or an aryl group. X and y is an integer from 2-50. The polybutylene terephthalate resin has inherent viscosity of 0.8-1.4 dl/g. The polyethylene terephthalate resin has inherent viscosity of 0.6-1.2 dl/g.
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