	US 12,029,801 B2
	Sunscreen multilayer particle
Jun Sasai, Kanagawa (JP); and Toshifumi Shiroya, Kanagawa (JP)
Assigned to L'OREAL, Paris (FR)
Appl. No. 17/609,531
Filed by L'OREAL, Paris (FR)
PCT Filed May 7, 2020, PCT No. PCT/JP2020/019171 § 371(c)(1), (2) Date Nov. 8, 2021, PCT Pub. No. WO2020/226184, PCT Pub. Date Nov. 12, 2020.
Claims priority of application No. 2019-088920 (JP), filed on May 9, 2019.
Prior Publication US 2022/0211588 A1, Jul. 7, 2022
Int. Cl. A61K 8/02 (2006.01); A61K 8/25 (2006.01); A61K 8/29 (2006.01); A61Q 17/04 (2006.01)

CPC A61K 8/0245 (2013.01) [A61K 8/25 (2013.01); A61K 8/29 (2013.01); A61Q 17/04 (2013.01); A61K 2800/26 (2013.01); A61K 2800/63 (2013.01); A61K 2800/651 (2013.01); A61K 2800/805 (2013.01)]

14 Claims

1. A multilayer UV filter particle, comprising:

an odd number of alternating layers of high and low refractive index materials,

wherein each layer has a refractive index that differs from that of adjacent layers by at least 0.2, the total number of layers is at least 9, and the particle does not contain a substrate,

wherein the high refractive index material has a refractive index of larger than 1.7 and less than 5.0, the low refractive index material has a refractive index of lower than 1.65, and the high and low refractive index materials are metal oxides, and

wherein the thickness of each of the layers of the high refractive index material ranges from 3 to 100 nm and the thickness of each of the layers of the low refractive index material ranges from 10 to 150 nm.