Cosmetics with enhanced durability

Claim 1

A method of enhancing adherence to the skin of a skin care preparation containing an active ingredient selected from the group consisting of pigments, sunscreens, moisturizers, and emollients, comprising the step of incorporating into the skin care preparation about 5-20 percent by weight of a film forming agent as an ingredient thereof, and applying the skin care preparation containing the active ingredient and the film forming agent to the skin; the film forming agent being an aqueous latex of a crosslinkable polydiorganosiloxane prepared by a method consisting essentially of: (A) homogenizing a mixture consisting essentially of (1) one hundred parts by weight of a polydiorganosiloxane of the formula HO(R 2 SiO) x H wherein R is a radical selected from the group consisting of methyl, ethyl, propyl, phenyl, vinyl, allyl, and 3,3,3-trifluoropropyl, and x is an integer having an average value of three to one hundred; (2) 15-75 millimoles of surface active anionic catalyst per kilogram of polydiorganosiloxane wherein said catalyst is selected from the group consisting of dodecylbenzene sulfonic acid and hydrogen lauryl sulfate; and (3) water, to yield an oil in water emulsion; (B) admixing 0.5-15 parts by weight of an alkoxy silicon compound selected from the group consisting of (i) silanes of the formula R' a Si(OR 3 ) 4--a wherein R' is a monovalent hydrocarbon radical having up to twelve carbon atoms, R 3 is an alkyl radical having one to six carbon atoms, and a has a value of zero or one; (ii) a partial hydrolyzate of the silane which is soluble in the polydiorganosiloxane; and (iii) mixtures of the silane and the partial hydrolyzate; (C) maintaining the emulsion at a temperature of fifteen to thirty degrees Centigrade for at least five hours at a pH of less than five until a crosslinked polymer emulsion is formed; (D) admixing sufficient base to raise the pH of the crosslinked polymer emulsion to greater than seven; and optionally (E) admixing greater than one part by weight of colloidal silica sol or colloidal silsesquioxane; to yield a latex which produces an elastomer upon removal of the water at room temperature.

Claim 2

A method of enhancing adherence to the skin of a skin care preparation containing an active ingredient selected from the group consisting of pigments, sunscreens, moisturizers, and emollients, comprising the step of incorporating into the skin care preparation about 5-20 percent by weight of a film forming agent as an ingredient thereof, and applying the skin care preparation containing the active ingredient and the film forming agent to the skin; the film forming agent being an aqueous latex of a crosslinkable polydiorganosiloxane prepared by a method consisting essentially of: (A) homogenizing a mixture consisting essentially of (1) one hundred parts by weight of a polydiorganosiloxane of the formula HO(R 2 SiO) x H wherein R is a radical selected from the group consisting of methyl, ethyl, propyl, phenyl, vinyl, allyl, and 3,3,3-trifluoropropyl, and x is an integer having an average value of three to one hundred; (2) 15-75 millimoles of surface active anionic catalyst per kilogram of polydiorganosiloxane wherein said catalyst is selected from the group consisting of dodecylbenzene sulfonic acid and hydrogen lauryl sulfate; and (3) water, to yield an oil in water emulsion; (B) admixing 0.5-15 parts by weight of an alkoxy silicon compound selected from the group consisting of (i) silanes of the formula R' a Si(OR 3 ) 4--a wherein R' is a monovalent hydrocarbon radical having up to twelve carbon atoms, R 3 is an alkyl radical having one to six carbon atoms, and a has a value of zero or one; (ii) a partial hydrolyzate of the silane which is soluble in the polydiorganosiloxane; and (iii) mixtures of the silane and the partial hydrolyzate; (C) maintaining the emulsion at a temperature of fifteen to thirty degrees Centigrade for at least five hours at a pH of less than five until a crosslinked polymer emulsion is formed; (D) admixing sufficient base to raise the pH of the crosslinked polymer emulsion to greater than seven; and optionally (E) admixing greater than one part by weight of colloidal silica sol or colloidal silsesquioxane; to yield a latex which produces an elastomer upon removal of the water at room temperature.