Process for producing a silicone elastomer emulsion and use thereof

Claim 2

A process for producing a silicone elastomer emulsion comprising emulsifying (A) a vinyl endblocked polydiorganosiloxane, and (B) an organosilicon compound having silicon-bonded hydrogen atoms using water and surfactant to form an emulsion, adding a platinum catalyst, and heating the emulsion forming a latex of crosslinked silicone.

Claim 3

A crosslinked silicone latex produced by the method of claim 1.

Claim 4

The process in accordance with claim 1 in which a colloidal silica is added to the latex of crosslinked silicone.

Claim 5

A crosslinked silicone latex produced by the method of claim 3.

Claim 6

The process in accordance with claim 1 in which the vinyl endblocked polydiorganosiloxane (A) is a polydiorganosiloxane terminated by triorganosiloxy groups and having two vinyl radicals per molecule, no silicon atom having more than one vinyl radical bonded thereto, the remaining organic radicals being selected from the group consisting of methyl, ethyl, phenyl and 3,3,3-trifluoropropyl radicals, at least 50 percent of the organic radicals being methyl radicals, and said polydiorganosiloxane having a viscosity of from 0.1 to 100 Pa·s at 25° C., and the organo-silicon compound (B) is a mixture of silicon compounds providing from 0.75 to 1.50 silicon-bonded hydrogen atoms per vinyl radical of (A), said mixture (B) consisting essentially of (1) an organosiloxane compound containing two silicon-bonded hydrogen atoms per molecule and the organic radicals being selected from the group consisting of alkyl radicals having from 1 to 12 carbon atoms inclusive, phenyl and 3,3,3-trifluoropropyl, no silicon atom having bonded thereto more than one silicon-bonded hydrogen atom, and said organosiloxane compound (1) having no more than 500 silicon atoms per molecule, and (2) an organosiloxane compound containing at least 3 silicon-bonded hydrogen atoms per molecule, the organic radicals being selected from the group consisting of alkyl radicals having from 1 to 12 carbon atoms inclusive, phenyl and 3,3,3-trifluoropropyl radicals, no silicon atom having bonded thereto more than one silicon-bonded hydrogen atom and said organosiloxane compound (2) having no more than 75 silicon atoms per molecule, said mixture (B) being such that at least 10 percent of the silicon-bonded hydrogen atoms are derived from (1) and at least 10 percent of the silicon-bonded hydrogen atoms are derived from (2), (1) and (2) composing 100 weight percent of mixture (B).

Claim 7

A crosslinked silicone latex produced by the method of claim 5.

Claim 8

The process in accordance with claim 5 in which a colloidal silica is added to the latex of crosslinked silicone.

Claim 9

A process in which a crosslinked silicone latex is produced in accordance with claim 1 and thereafter the water is evaporated from the crosslinked silicone latex to form an elastomeric film.

Claim 10

The process in accordance with claim 8 in which the latex is coated on a substrate before evaporating the water.

Claim 11

A process in which a crosslinked silicone latex is produced in accordance with claim 5 and thereafter the water is evaporated from the crosslinked silicone latex to form an elastomeric film.

Claim 12

The process in accordance with claim 10 in which the latex is coated on a substrate before evaporating the water.

Claim 13

A process in which a crosslinked silicone latex is produced in accordance with claim 7 and thereafter the water is evaporated from the crosslinked silicone latex to form an elastomeric film.

Claim 14

The process in accordance with claim 12 in which the latex is coated on a substrate before evaporating the water.

Claim 15

The process in accordance with claim 13 in which the substrate is a textile.

Claim 16

The process in accordance with claim 14 in which the substrate is paper.