US 11,795,298 B2
Polyester resin composition, light-reflector component containing same, and light reflector
Kaori Furukawa, Otsu (JP); Takahiro Shimizu, Otsu (JP); and Takuya Shimoharai, Otsu (JP)
Assigned to TOYOBO MC CORPORATION, Osaka (JP)
Appl. No. 16/982,256
Filed by TOYOBO MC CORPORATION, Osaka (JP)
PCT Filed Mar. 25, 2019, PCT No. PCT/JP2019/012393
§ 371(c)(1), (2) Date Sep. 18, 2020,
PCT Pub. No. WO2019/188921, PCT Pub. Date Oct. 3, 2019.
Claims priority of application No. 2018-058292 (JP), filed on Mar. 26, 2018.
Prior Publication US 2021/0047499 A1, Feb. 18, 2021
Int. Cl. C08K 5/098 (2006.01); C08K 3/26 (2006.01); C08K 3/30 (2006.01); C08K 3/34 (2006.01); C08K 3/36 (2006.01); C08L 67/02 (2006.01); G02B 5/08 (2006.01)
CPC C08K 5/098 (2013.01) [C08K 3/26 (2013.01); C08K 3/30 (2013.01); C08K 3/346 (2013.01); C08K 3/36 (2013.01); C08L 67/02 (2013.01); G02B 5/0808 (2013.01); C08K 2003/265 (2013.01); C08K 2003/3045 (2013.01)] 12 Claims
 
1. A polyester resin composition comprising:
a polyester resin A that contains 82 to 88% by mass of a polybutylene terephthalate resin and 12 to 18% by mass of a polyethylene terephthalate resin;
a metal organic acid salt B that is either one or both of an alkali metal organic acid salt and an alkaline earth metal organic acid salt; and
an inorganic filler C having an average particle diameter of 0.05 to 3 μm in an amount of 1 to 13 parts by mass based on 100 parts by mass of the polyester resin A,
wherein the polyester resin composition includes 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,
wherein, in the polyester resin composition, a content of linear oligomers of polybutylene terephthalate, or a content of the linear oligomers of the polybutylene terephthalate and linear oligomers of polyethylene terephthalate is less than or equal to 1000 mg/kg, and
wherein the polyester resin composition achieves a maximum height roughness (Rz) of less than or equal to 0.70 μm,
wherein the maximum height roughness (Rz) is measured by injection-molding the polyester resin composition using a mirror-surface mold having a temperature of 45° C. and surface-finished with #16000, at a molding temperature of 260° C. for a packing time of greater than or equal to 4.5 seconds, to obtain a flat plate of 100 mm in length×100 mm in width×2 mm in thickness, and measuring the maximum height roughness (Rz) of the flat plate.