| abstract |
An object of the present invention is to provide a polyester resin composition for obtaining a reflecting plate having high reflectance and heat even when exposed to a reflowing step at the manufacturing step or mounting of the LED package, Or, under the heat or light generated by the light source in the use environment, the decrease in reflectance is also small. The polyester resin composition for a reflective material of the present invention contains: 30% by mass to 80% by mass of a polyester resin (A) having a melting point (Tm) as measured by a differential scanning calorimeter (DSC) Or a glass transition temperature (Tg) of 250 ° C or more; 5 mass % to 30 mass % of the fibrous reinforcing material (B), and the average fiber length (1) of the fibrous reinforcing material (B) is 2 μm to 300 μm , the average fiber diameter (d) is 0.05 μm to 18 μm, and the aspect ratio (l/d) obtained by dividing the average fiber length (1) by the average fiber diameter (d) is 2 to 20; White pigment (C) in a mass% to 50% by mass (wherein the total of (A), (B), and (C) is 100% by mass). |