公开(公告)号：US20220313566A1

公开(公告)日：2022-10-06

申请号：US17607926

申请日：2020-05-06

Applicant: L'OREAL

Inventor： Andres CARDOZO PEREZ ,  Antoine MONTAUX-LAMBERT

IPC: A61K8/02 ,  A61K8/29 ,  A61K8/25 ,  A61Q17/04 ,  A61K8/19

Abstract: The invention relates to i) a multilayer material; ii) a process for preparing said multilayer materials; iii) a cosmetic composition comprising one or more multilayer materials; iv) a process for treating keratin materials, notably human keratin materials such as the skin; v) the use of multilayer material for screening out ultraviolet (UV) rays. Said multilayer material has an odd number N of layers: ▪comprising at least three layers, each layer of which consists of a material A or of a material B different from A, said successive layers A and B being alternated and two adjacent layers having different refractive indices; ▪for which the thickness of each layer obeys the mathematical formula (I) below: [x/y/(αx/y)a/x] in which formula (I): x is the thickness of the inner and outer layer; y is the thickness of the layer adjacent to the inner layer αx or the outer layer x; α is an integer or fraction and α=2±0 to 15%, preferably α=2±0 to 10%, more preferentially α=2±0 to 5%, the intermediate odd layers (αx) have a double thickness±0 to 15% of the thickness of said outer layers x; and a represents an integer greater than or equal to 0, connected to the number of alternated layers N such that a=(N−3)/2; it being understood that: ▪preferably, x has a different thickness from y; ▪when several layers are of thickness x, this means that each layer has a thickness x±0 to 15%, preferably±0 to 10%, more preferentially±0 to 5%; ▪when several layers are of thickness y, this means that each layer has a thickness y±0 to 15%, preferably±0 to 10%, more preferentially±0 to 5%; and ▪when several layers are of thickness α x, this means that each layer has a thickness α x±0 to 15%, preferably±0 to 10%, more preferentially±0 to 5%.