US 12,419,820 B2
Fatty acid calcium salt particles and cosmetics
Tetsuya Kanemaru, Tokyo (JP); Yoshihiro Nishiyama, Tokyo (JP); Takuya Hiruma, Tokyo (JP); Yuka Iwahashi, Tokyo (JP); Takeshi Yoshimura, Hyogo (JP); and Mako Iwasaki, Hyogo (JP)
Assigned to NOF CORPORATION, Tokyo (JP)
Appl. No. 17/796,092
Filed by NOF CORPORATION, Tokyo (JP)
PCT Filed Feb. 17, 2021, PCT No. PCT/JP2021/006009
§ 371(c)(1), (2) Date Jul. 28, 2022,
PCT Pub. No. WO2021/172146, PCT Pub. Date Sep. 2, 2021.
Claims priority of application No. 2020-033890 (JP), filed on Feb. 28, 2020.
Prior Publication US 2023/0077466 A1, Mar. 16, 2023
Int. Cl. A61K 8/36 (2006.01); A61Q 19/10 (2006.01)
CPC A61K 8/36 (2013.01) [A61Q 19/10 (2013.01); A61K 2800/412 (2013.01)] 5 Claims
 
1. A fatty acid calcium salt particle consisting of a calcium salt of a fatty acid having 12 to 22 carbon atoms, wherein the particle have a plate shape, the median size of the particle is 4.0 μm to 15.0 μm, the particle size digest A expressed by the following equation (1) satisfies the relation A≤2.0, and the average thickness is 350 to 800 nm:
the particle size digest A=(D90−D10)/D50  equation (1),
wherein 4.0≤D50≤15.0,
wherein D10 is the 10% cumulative size in μm of the fatty acid calcium salt particle on a volumetric basis,
D50 is the median size in μm of the fatty acid calcium salt particle on a volumetric basis, and
D90 is the 90% cumulative size in μm of the fatty acid calcium salt particle on a volumetric basis.