Precured silicone emulsion

Claim 2

An aqueous silicone emulsion which dries to an elastomer comprising the product produced by (A) homogenizing a mixture consisting essentially of (1) 100 parts by weight of hydroxyl endblocked polydiorganosiloxane oligomer free of aliphatic unsaturation, (2) from 0.1 to 10 parts by weight of organosilicon hydride crosslinker, (3) anionic or nonionic surfactant, and (4) sufficient water to give a polydiorganosiloxane content in the mixture of from 40 to 70 percent by weight, (B) emulsion polymerizing the mixture of (A) by addition of anionic polymerization catalyst suitable to copolymerize the ingredients (1) and (2) to obtain a hydroxyl endblocked copolymer having pendant hydrogen atoms on the siloxane chain, then (C) arresting polymerization by raising the pH to a value of from about 6 to 11, then (D) crosslinking the emulsion copolymer by addition of a silanol-silicon hydride condensation catalyst, to obtain an aqueous silicone emulsion which dries to an elastomer.

Claim 3

The aqueous silicone emulsion of claim 1 in which the organosilicon hydride crosslinker (2) is selected from the group consisting of hydrolyzable silane having hydrogen and hydrolyzable atoms or groups bonded to silicon, alkylhydrogencyclosiloxane, and polyorganohydrogensiloxane.

Claim 4

The aqueous silicone emulsion of claim 1 in which the anionic polymerization catalyst is chosen from the group consisting of strong mineral acids and surface active sulfonic acids.

Claim 5

The aqueous silicone emulsion of claim 1 in which the pH is from 6 to 7.5.

Claim 6

The aqueous silicone emulsion of claim 1 to which a filler has been added.

Claim 7

The aqueous silicone emulsion of claim 1 in which the silanol-silicon hydride condensation catalyst is selected from the group consisting of tin salts, zinc salts, and hydroxylamines.

Claim 8

The aqueous silicone emulsion of claim 5 in which the organosilicon hydride crosslinker contains hydrolyzable atoms or groups bonded to silicon.

Claim 9

The aqueous silicone emulsion of claim 5 in which the organosilicon hydride crosslinker is an alkylhydrogencyclosiloxane.

Claim 10

The aqueous silicone emulsion of claim 5 in which the organosilicon hydride crosslinker is polymethylhydrogensiloxane fluid.

Claim 11

The aqueous silicone emulsion of claim 7 in which the condensation catalyst is a dialkyltindicarboxylate present in an amount of from 0.2 to 1 part by weight.

Claim 12

The aqueous silicone emulsion of claim 7 in which the condensation catalyst is a stannous salt.

Claim 13

The aqueous silicone emulsion of claim 7 in which the condensation catalyst is a hydroxylamine.

Claim 14

The aqueous silicone emulsion of claim 8 in which the alkylhydrogencyclosiloxane is present in an amount of from 0.5 to 2 parts by weight and the condensation catalyst is a dialkyltindicarboxylate present in an amount of from 0.1 to 1 part by weight.

Claim 15

The aqueous silicone emulsion of claim 9 in which the condensation catalyst is a dialkyltindicarboxylate present in an amount of from 0.1 to 1 part by weight.

Claim 16

The aqueous silicone emulsion of claim 9 in which the condensation catalyst is a stannous salt present in an amount of from 0.1 to 1 part by weight.

Claim 17

The aqueous silicone emulsion of claim 9 in which the condensation catalyst is a hydroxylamine present in an amount of from 0.5 to 1.5 parts by weight.

Claim 18

An aqueous silicone emulsion which dries to an elastomer comprising the product produced by (A) homogenizing a mixture consisting essentially of (1) 100 parts by weight of hydroxyl endblocked polydiorganosiloxane oligomer free of aliphatic unsaturation, (2) from 0.1 to 10 parts by weight of organosilicon hydride crosslinker, (3) surface active sulfonic acid surfactant, and (4) sufficient water to give a polydiorganosiloxane content in the mixture of from 40 to 70 percent by weight, (B) emulsion polymerizing the mixture of (A) by allowing copolymerization of the ingredients (1) and (2) to obtain a hydroxyl endblocked copolymer having pendant hydrogen atoms on the siloxane chain, then (C) arresting polymerization by raising the pH to a value of from about 6 to 11, then (D) crosslinking the emulsion copolymer by addition of a silanol-silicon hydride condensation catalyst, to obtain an aqueous silicone emulsion which dries to an elastomer.

Claim 19

An aqueous silicone emulsion which dries to an elastomer comprising the product produced by (A) homogenizing a mixture consisting essentially of (1) 100 parts by weight of hydroxyl endblocked polydiorganosiloxane oligomer free of aliphatic unsaturation, (2) from 0.1 to 10 parts by weight of organosilicon hydride crosslinker, (3) surface active sulfonic acid surfactant, and (4) sufficient water to give a polydiorganosiloxane content in the mixture of from 40 to 70 percent by weight, (B) emulsion polymerizing the mixture of (A) by allowing copolymerization of the ingredients (1) and (2) to obtain a hydroxyl endblocked copolymer having pendant hydrogen atoms on the siloxane chain, then (C) arresting polymerization by raising the pH to a value of from about 6 to 11, then (D) crosslinking the emulsion copolymer by addition of a silanol-silicon hydride condensation catalyst, to obtain an aqueous silicone emulsion which dries to an elastomer.

Claim 20

An aqueous silicone emulsion which dries to an elastomer consisting essentially of the product produced by (A) homogenizing a mixture consisting essentially of (1) 100 parts by weight of hydroxyl endblocked polydiorganosiloxane oligomer free of aliphatic unsaturation, (2) from 0.1 to 10 parts by weight of organosilicon hydride crosslinker, (3) anionic or nonionic surfactant, and (4) sufficient water to give a polydiorganosiloxane content in the mixture of from 40 to 70 percent by weight, (B) emulsion polymerizing the mixture of (A) by addition of anionic polymerization catalyst suitable to copolymerize the ingredients (1) and (2) to obtain a hydroxyl endblocked copolymer having pendant hydrogen atoms on the siloxane chain, then (C) arresting polymerization by raising the pH to a value of from about 6 to 11, then (D) crosslinking the emulsion copolymer by addition of a silanol-silicon hydride condensation catalyst, to obtain an aqueous silicone emulsion which dries to an elastomer.

Claim 21

An aqueous silicone emulsion which dries to an elastomer consisting essentially of the product produced by (A) homogenizing a mixture consisting essentially of (1) 100 parts by weight of hydroxyl endblocked polydiorganosiloxane oligomer free of aliphatic unsaturation, (2) from 0.1 to 10 parts by weight of organosilicon hydride crosslinker, (3) anionic or nonionic surfactant, and (4) sufficient water to give a polydiorganosiloxane content in the mixture of from 40 to 70 percent by weight, (B) emulsion polymerizing the mixture of (A) by addition of anionic polymerization catalyst suitable to copolymerize the ingredients (1) and (2) to obtain a hydroxyl endblocked copolymer having pendant hydrogen atoms on the siloxane chain, then (C) arresting polymerization by raising the pH to a value of from about 6 to 11, then (D) crosslinking the emulsion copolymer by addition of a silanol-silicon hydride condensation catalyst, to obtain an aqueous silicone emulsion which dries to an elastomer.

Claim 22

An aqueous silicone emulsion which dries to an elastomer consisting essentially of the product produced by (A) homogenizing a mixture consisting essentially of (1) 100 parts by weight of hydroxyl endblocked polydiorganosiloxane oligomer free of aliphatic unsaturation, (2) from 0.1 to 10 parts by weight of organosilicon hydride crosslinker, (3) surface active sulfonic acid surfactant, and (4) sufficient water to give a polydiorganosiloxane content in the mixture of from 40 to 70 percent by weight, (B) emulsion polymerizing the mixture of (A) by allowing copolymerization of the ingredients (1) and (2) to obtain a hydroxyl endblocked copolymer having pendant hydrogen atoms on the siloxane chain, then (C) arresting polymerization by raising the pH to a value of from about 6 to 11, then (D) crosslinking the emulsion copolymer by addition of a silanol-silicon hydride condensation catalyst, to obtain an aqueous silicone emulsion which dries to an elastomer.

Claim 23

An aqueous silicone emulsion which dries to an elastomer consisting essentially of the product produced by (A) homogenizing a mixture consisting essentially of (1) 100 parts by weight of hydroxyl endblocked polydiorganosiloxane oligomer free of aliphatic unsaturation, (2) from 0.1 to 10 parts by weight of organosilicon hydride crosslinker, (3) surface active sulfonic acid surfactant, and (4) sufficient water to give a polydiorganosiloxane content in the mixture of from 40 to 70 percent by weight, (B) emulsion polymerizing the mixture of (A) by allowing copolymerization of the ingredients (1) and (2) to obtain a hydroxyl endblocked copolymer having pendant hydrogen atoms on the siloxane chain, then (C) arresting polymerization by raising the pH to a value of from about 6 to 11, then (D) crosslinking the emulsion copolymer by addition of a silanol-silicon hydride condensation catalyst, to obtain an aqueous silicone emulsion which dries to an elastomer.