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US 12,029,801 B2Granted
Sunscreen multilayer particle
AssigneeL'oreal
InventorsJun Sasai, Toshifumi Shiroya
Life of this patent
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Abstract
The present invention relates to 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. The particle according to the present invention can have a good UV filtering effect.
Claims14
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.
1 more element
Dependencies are inferred from the claim text.