Polyester resin composition, light-reflector component containing same, and light reflector

Abstract

The present invention is a polyester resin composition that includes a polyester resin A containing 50 to 100% by mass of a polybutylene terephthalate resin and 0 to 50% by mass of a polyethylene terephthalate resin, a metal organic acid salt B being either one or both of an alkali metal organic acid salt and an alkaline earth metal organic acid salt, a polyfunctional glycidyl group-containing styrene-based polymer C in a predetermined amount, and an inorganic filler D having an average particle diameter of 0.05 to 3 μm. The polyester resin composition contains a predetermined amount of alkali metal atoms/alkaline earth metal atoms, and further the content of linear oligomers of polybutylene terephthalate, or the content of linear oligomers of polybutylene terephthalate and polyethylene terephthalate is less than or equal to 1000 mg/kg.

The invention claimed is: 
     
       1. A polyester resin composition, comprising a polyester resin A containing 50 to 100% by mass of a polybutylene terephthalate resin and 0 to 50% by mass of a polyethylene terephthalate resin, wherein
 the polyester resin composition contains a metal organic acid salt B being either one or both of an alkali metal organic acid salt and an alkaline earth metal organic acid salt, and a polyfunctional glycidyl group-containing styrene-based polymer C in an amount of 0.05 to 3 parts by mass per 100 parts by mass of the polyester resin A and an inorganic filler D having an average particle diameter of 0.05 to 3 μm in an amount of 1 to 20 parts by mass based on 100 parts by mass of the polyester resin A, 
 the polyester resin composition contains either one or both of alkali metal atoms and alkaline earth metal atoms in an amount of 0.000005 to 0.05 parts by mass based on 100 parts by mass of the polyester resin A, and 
 the polyester resin composition has a content of linear oligomers of polybutylene terephthalate of or a content of linear oligomers of the polybutylene terephthalate and linear oligomers of polyethylene terephthalate of less than or equal to 1000 mg/kg. 
 
     
     
       2. The polyester resin composition according to  claim 1 , wherein
 the polyester resin composition contains either one or both of the alkali metal atoms and the alkaline earth metal atoms in an amount of 0.0005 to 0.05 parts by mass based on 100 parts by mass of the polyester resin A. 
 
     
     
       3. The polyester resin composition according to  claim 1 , wherein
 the polyester resin composition has a content of titanium atoms of less than or equal to 50 mg/kg. 
 
     
     
       4. The polyester resin composition according to  claim 1 , wherein
 a metal kind of the metal organic acid salt B is one or two or more kinds selected from the group consisting of lithium, sodium, potassium, calcium, and magnesium. 
 
     
     
       5. The polyester resin composition according to  claim 1 , wherein
 the metal organic acid salt B is one or two or more kinds selected from the group consisting of lithium acetate, sodium acetate, potassium acetate, calcium acetate, magnesium acetate, lithium benzoate, sodium benzoate, and potassium benzoate. 
 
     
     
       6. The polyester resin composition according to  claim 1 , wherein
 the inorganic filler D is one or two or more kinds selected from the group consisting of calcium carbonate, silica, kaolin, barium sulfate, and titanium dioxide. 
 
     
     
       7. A light-reflector component, comprising the polyester resin composition according to  claim 1 . 
     
     
       8. A light reflector, wherein a light reflective metal layer is formed at least on a part of a surface of the light-reflector component according to  claim 7 .