Method of producing a silicone water-based elastomer

Claim 1

A method of producing a foam in which the ingredients are stored before use as two parts, Part I consisting essentially of 100 parts by weight of an anionically stabilized, hydroxyl enblocked polydiorganosiloxane having a weight average molecular weight of about 50,000, the organic radicals being monovalent hydrocarbon radicals containing les than seven carbon atoms per radical or 2-(perfluoroalkyl)ethyl radicals having less than seven carbon atoms per radical, present as an emulsion of dispsered particles in water, the emulsion having a pH of greater than 9 (A), from 1 to 10 parts by weight of (D), collodial silica and (F) from 1 to 10 parts by weight of fibers having a diameter of from 1 to 10 micrometers and a length of from 30 micrometers to 10 millimeters with a length to diameter ratio of greater than 10 to 1, or from 0.2 to 1.5 parts by weight of lauryl alcohol, or mixtures thereof, and Part II consisting essentially of 0.1 to 2.0 parts by weight of dialkyltindicarboxylate (B), from 1 to 10 parts by weight of (C) alkylorthosilicate of the formula Si(OR')4 where R' is a lower alkyl radical of from 1 to 4 carbon atoms inclusive, and from 15 to 35 parts by weight of (D) colloidal slica; the method consisting essentially of (1) mixing Part I and Part II to produce an emulsion of the ingredients dispersed in water, (2) immediately forming a froth of the mixture, then (3) immediately removing water from the froth to produce a foam.

Claim 2

A method of producing a foam in which the ingredients are stored before use as two parts, Part I consisting essentially of 100 parts by weight of an anionically stabilized, hydroxyl enblocked polydiorganosiloxane having a weight average molecular weight of about 50,000, the organic radicals being monovalent hydrocarbon radicals containing les than seven carbon atoms per radical or 2-(perfluoroalkyl)ethyl radicals having less than seven carbon atoms per radical, present as an emulsion of dispsered particles in water, the emulsion having a pH of greater than 9 (A), from 1 to 10 parts by weight of (D), collodial silica and (F) from 1 to 10 parts by weight of fibers having a diameter of from 1 to 10 micrometers and a length of from 30 micrometers to 10 millimeters with a length to diameter ratio of greater than 10 to 1, or from 0.2 to 1.5 parts by weight of lauryl alcohol, or mixtures thereof, and Part II consisting essentially of 0.1 to 2.0 parts by weight of dialkyltindicarboxylate (B), from 1 to 10 parts by weight of (C) alkylorthosilicate of the formula Si(OR')4 where R' is a lower alkyl radical of from 1 to 4 carbon atoms inclusive, and from 15 to 35 parts by weight of (D) colloidal slica; the method consisting essentially of (1) mixing Part I and Part II to produce an emulsion of the ingredients dispersed in water, (2) immediately forming a froth of the mixture, then (3) immediately removing water from the froth to produce a foam.