US 12,419,818 B2
External preparation
Takashi Fukui, Kawasaki (JP); Tomonari Okada, Tsukuba (JP); Noriko Tejima, Sumida-ku (JP); and Keigo Kajiwara, Setagaya-ku (JP)
Assigned to KAO CORPORATION, Tokyo (JP)
Appl. No. 17/417,645
Filed by KAO CORPORATION, Tokyo (JP)
PCT Filed Dec. 27, 2019, PCT No. PCT/JP2019/051469
§ 371(c)(1), (2) Date Mar. 10, 2022,
PCT Pub. No. WO2020/138431, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 2018-244998 (JP), filed on Dec. 27, 2018; and application No. PCT/JP2018/048006 (WO), filed on Dec. 27, 2018.
Prior Publication US 2022/0226212 A1, Jul. 21, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. A61Q 17/04 (2006.01); A61K 8/04 (2006.01); A61K 8/27 (2006.01); A61K 8/29 (2006.01); A61K 8/34 (2006.01); A61K 8/36 (2006.01); A61K 8/891 (2006.01); A61K 8/92 (2006.01)
CPC A61K 8/27 (2013.01) [A61K 8/04 (2013.01); A61K 8/29 (2013.01); A61K 8/342 (2013.01); A61K 8/361 (2013.01); A61K 8/891 (2013.01); A61K 8/92 (2013.01); A61Q 17/04 (2013.01)] 13 Claims
 
1. An external preparation, comprising:
a tabular metal oxide (A) which is tabular titanium oxide having a thickness of 30 nm or more and 360 nm or less; and
a nonvolatile oil (B),
wherein a content of the tabular metal oxide (A) is 1% by mass or more and 35% by mass or less,
wherein a content of the nonvolatile oil (B) is 10% by mass or more,
wherein a ratio by mass of the tabular metal oxide (A) to the nonvolatile oil (B) is 0.05 or more and 5 or less,
wherein the external preparation is a water-in-oil type emulsion composition, and
wherein the external preparation has an IR protection factor of 10% or more, which is 100%−the percentage fraction of transmissivity at 1500 nm wavelength of 28.5 mg of the external preparation applied and dried on a 5 cm×5 cm polymethyl methacrylate resin substrate relative to the transmissivity at 1500 nm wavelength of the polymethyl methacrylate resin substrate with glycerin applied and dried.