US 11,737,958 B2
Method for producing UV protective coating
Tomonari Okada, Yashio (JP)
Assigned to KAO CORPORATION, Tokyo (JP)
Appl. No. 16/604,685
Filed by KAO CORPORATION, Tokyo (JP)
PCT Filed Apr. 18, 2018, PCT No. PCT/JP2018/015981
§ 371(c)(1), (2) Date Oct. 11, 2019,
PCT Pub. No. WO2018/194087, PCT Pub. Date Oct. 25, 2018.
Claims priority of application No. 2017-082079 (JP), filed on Apr. 18, 2017.
Prior Publication US 2020/0155422 A1, May 21, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. A61K 8/34 (2006.01); A61K 8/81 (2006.01); B05B 5/025 (2006.01); B05B 5/16 (2006.01); A61K 8/02 (2006.01); A61K 8/35 (2006.01); A61K 8/87 (2006.01); A61Q 17/04 (2006.01)
CPC A61K 8/027 (2013.01) [A61K 8/34 (2013.01); A61K 8/35 (2013.01); A61K 8/8135 (2013.01); A61K 8/87 (2013.01); A61Q 17/04 (2013.01); B05B 5/0255 (2013.01); B05B 5/1691 (2013.01); A61K 2800/87 (2013.01); A61K 2800/884 (2013.01)] 14 Claims
 
1. A method for forming a UV protective porous coating in the form of a deposit of continuous fibers on skin, the method comprising:
applying a first composition comprising a UV protective agent to the skin, and
separately from the applying the first composition, electrostatically spraying a second composition comprising a component (a) and a component (b) directly onto the skin, thereby depositing the second composition in the form of a deposit of continuous fibers at a site of application to form the UV protective porous coating on the skin,
wherein
the component (a) is a volatile substance comprising at least one member selected from the group consisting of ethanol and 1-butanol, wherein a content of the component (a) in the second composition is from 30 mass % to 98 mass %,
the component (b) comprises at least one member selected from the group consisting of polyvinyl butyral, polyacrylate and polyvinyl acetal diethylaminoacetate, wherein a content of the component (b) in the second composition is from 2 mass % to 50 mass %,
wherein the UV protective porous coating comprises a deposit comprising continuous fibers, and the continuous fibers are formed from the water-insoluble polymer by the electrostatically spraying,
wherein the continuous fibers are formed from the water-insoluble polymer during the electrostatically spraying of the second composition,
wherein the second composition for the electrostatically spraying is in a liquid form at 20° C. and
wherein a content ratio of the component (a) and the component (b), ((a)/(b)), is from 0.5 to 40.