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Shiseido Patents Sunblock Cosmetic

March 5, 2014

US Patent No. 8,642,018 B2; Shiseido Company, Ltd., Tokyo, has patented a water-in-oil emulsified sunscreen cosmetic that exhibits excellent long lasting coverage and ease of washability. It is comprised of hydrophobic zinc oxide powder (manufactured through a method in which a zinc oxide powder is dispersed in a solvent, and the surface of the zinc oxide powder is treated with a phosphate ester having a perfluoroalkyl); volatile silicone; caprylylmethicone; polyoxyalkylene-modified organopolysiloxane; water; nonvolatile non-polar oil and/or nonvolatile silicone oil; and octylmethoxy cinnamate.

The hydrophobic zinc oxide powder absorbs from 10-40mL/100g of oil.
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