| 摘要 |
PURPOSE: A polyester resin composition is provided to have good reflectivity, high rigidity, and low thermal contraction ratio, to have high productivity because low generating breakage generation, and to reduce cost by making low density possible at the same time. CONSTITUTION: A polyester resin composition comprises a resin containing ethylene terephthalate as a main repeating unit, 16.0 weight% or more amount of bubble formable barium sulfate of which average diameter is 4.5 micron or less, and 1.0 weight% or more of inorganic particles for reducing density having bubble forming ability, of which average diameter is 10.0 micron or less, and reflectivity is 2.2 or less, except barium sulfate. The inherent viscosity of the polyester resin composition is 0.635 dl/g or higher, and the melting point is 245 °C or higher.
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