Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
280 words
A method of producing an aqueous latex of crosslinked polydiorganosiloxane consisting essentially of (A) homogenizing a mixture consisting essentially of (1) 100 parts by weight of polydiorganosiloxane of the formula: HO(R.sub.2 SiO).sub.x H wherein each 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 average value in the range of from 3 to 100 inclusive (2) from 15 to 75 millimoles of surface active anionic catalyst per kilogram of polydiorganosiloxane where 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, then (B) admixing from 0.5 to 15 parts by weight of an alkoxy silicon compound selected from the group consisting of silane of the formula R a 'Si(OR 3 ) 4-a where R' is a monovalent hydrocarbon radical having up to 12 carbon atoms, R 3 is an alkyl radical having 1 to 6 inclusive carbon atoms, and a is 0 or 1; a partial hydrolyzate of the silane where the partial hydrolyzate is soluble in the polydiorganosiloxane (1); and mixtures of silane and partial hydrolyzate, (C) maintaining the emulsion produced in (B) at a temperature of from 15 to 30° C. for at least 5 hours at a pH of less than 5 until a crosslinked polymer emulsion is formed, then (D) admixing sufficient base to raise the pH of the product of (C) to greater than 7, then (E) admixing greater than 1 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
Independent Claim
280 words
A method of producing an aqueous latex of crosslinked polydiorganosiloxane consisting essentially of (A) homogenizing a mixture consisting essentially of (1) 100 parts by weight of polydiorganosiloxane of the formula: HO(R.sub.2 SiO).sub.x H wherein each 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 average value in the range of from 3 to 100 inclusive (2) from 15 to 75 millimoles of surface active anionic catalyst per kilogram of polydiorganosiloxane where 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, then (B) admixing from 0.5 to 15 parts by weight of an alkoxy silicon compound selected from the group consisting of silane of the formula R a 'Si(OR 3 ) 4-a where R' is a monovalent hydrocarbon radical having up to 12 carbon atoms, R 3 is an alkyl radical having 1 to 6 inclusive carbon atoms, and a is 0 or 1; a partial hydrolyzate of the silane where the partial hydrolyzate is soluble in the polydiorganosiloxane (1); and mixtures of silane and partial hydrolyzate, (C) maintaining the emulsion produced in (B) at a temperature of from 15 to 30° C. for at least 5 hours at a pH of less than 5 until a crosslinked polymer emulsion is formed, then (D) admixing sufficient base to raise the pH of the product of (C) to greater than 7, then (E) admixing greater than 1 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 3
Independent Claim
33 words
The method of claim in which R' is selected from the group consisting of methyl, ethyl, propyl, and phenyl and R 3 is selected from the group consisting of methyl, ethyl, and propyl.
Claim 4
Dependent Claim
37 words
The method of claim 1 in which the alkoxy silicon compound is present in an amount of from 1 to 5 parts by weight and is chosen from the group consisting of ethylorthosilicate, ethylpolysilicate, methyltrimethoxysilane, and phenyltrimethoxysilane.
Claim 5
Dependent Claim
18 words
The method of claim 3 in which (E) is 10 to 50 parts by weight of colloidal silica.
Claim 6
Dependent Claim
13 words
The aqueous latex of crosslinked polydiorganosiloxane produced by the method of claim 1.
Claim 7
Dependent Claim
13 words
The aqueous latex of crosslinked polydiorganosiloxane produced by the method of claim 5.
Claim 8
Dependent Claim
10 words
The elastomer produced by drying the latex of claim 6.
Claim 9
Dependent Claim
10 words
The elastomer produced by drying the latex of claim 7.