Water repellent and method of preparation
AssigneeDow Corning Toray Silicone Co., Ltd.
InventorAsao Harashima
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Abstract
A water repellent powdered material and a method of making the powder in which the powdered material is mixed with an organic solvent solution of a triorganosiloxysilicic acid having the formula (R.sub.3 SiO.sub.1/2).sub.2 nSiO.sub.2 in which R is a monovalent hydrocarbon radical such as alkyl, aryl, and alkenyl; and n is an integer having a value of one to five; with the acid being present in an amount of from 0.1 to 20 parts by weight per one hundred parts by weight of the powdered material. The powder can be used to formulate cosmetic foundations.
Claims4
A cosmetic foundation comprising a wax, a liquid paraffin, a dimethylpolysiloxane, and a water repellent powder made by (i) mixing a powdered material with an organic solvent solution of a triorganosiloxy silicic acid having the formula (R.sub.3 SiO.sub.178 ).sub.2 nSiO.sub.2 in which R is a monovalent hydrocarbon radical selected from the group consisting of alkyl, aryl, and alkenyl;
- and n is an integer having a value of one to five;
- the triorganosiloxy silicic acid being present in an amount of from 0.1 to 20 parts by weight per one hundred parts by weight of the powdered material;
- the triorganosiloxy silicic acid being prepared by reacting water glass and a hexaorganodisilizane with heating in an aromatic solvent/water mixture followed by extractive drying;
- and (ii) removing the solvent.
Dependencies are inferred from the claim text.