US 11,939,448 B2
Light reflecting body
Kenichiro Eguchi, Amagasaki (JP); and Yutaka Minamino, Amagasaki (JP)
Assigned to SHIRAISHI KOGYO KAISHA, LTD., Osaka (JP)
Filed by Shiraishi Kogyo Kaisha, Ltd., Osaka (JP)
Filed on May 14, 2021, as Appl. No. 17/320,788.
Claims priority of application No. 2020-085639 (JP), filed on May 15, 2020.
Prior Publication US 2021/0355295 A1, Nov. 18, 2021
Int. Cl. C08K 3/26 (2006.01); G02B 5/08 (2006.01)
CPC C08K 3/26 (2013.01) [G02B 5/0808 (2013.01); C08K 2003/265 (2013.01); C08K 2201/005 (2013.01); C08K 2201/006 (2013.01)] 4 Claims
 
1. A light reflecting body comprising:
an injection molded base containing a resin material and a calcium carbonate, the resin material being polybutylene terephthalate composition; and
a metal layer on a surface of the injection molded base, wherein
the calcium carbonate has a BET specific surface area of 1 to 15 m2/g,
the calcium carbonate has such a pore distribution curve determined by mercury porosimetry that a top of a peak representing interparticle void size is in a pore size range of 0.1 to 1.0 μm,
the calcium carbonate has such a particle size distribution determined by using an electron microscope that a proportion of particles having a particle size of 0.1 μm or less is 10% or less of the calcium carbonate, and
a residue on a sieve having a mesh size of 45 μm after wet sieving of the calcium carbonate is 0.1% or less.