Completely solventless two component RTV silicone composition

Claim 2

A self-bonding, soventless, room temperature vulcanizable silicone rubber composition comprising: (1) 100 parts by weight of a first mixture comprising (A) 83 to 98.6 parts by weight of a silanol endstopped diorganopolysiloxane polymer having a viscosity varying from 100 to 4000 centipoise at 25° C., wherein the organo groups are monovalent hydrocarbon radicals, and (B) 1.4 to 17 parts by weight of resinous copolymer comprising R 3 SiO 0 .5 units and SiO 2 units, wherein R is a monovalent hydrocarbon radical and wherein said copolymer has from 0.5 to 1 R 3 SiO 0 .5 unit per SiO 2 unit; and (2) 1 to 20 parts by weight of a reacted catalyst mixture comprising: (C) 10 to 50 parts by weight of an alkyl silicate of the formula (R.sup.1).sub.m Si(OR.sup.2).sub.4-m and partial hydrolysis products thereof, wherein R 1 and R 2 are monovalent hydrocarbon radicals, m is 0 or 1, and which is pre-reacted (D) 10 parts by weight of a tin salt of a carboxylic acid, (E) 10 to 30 parts by weight of a self-bonding additive having the formula ##STR6## wherein R 3 is a monovalent hydrocarbon radical, E is a hydrolyzable group selected from the group consisting of alkoxy, phenoxy, amino and dialkylamino, and θ is a nitrogen functional radical which is reacted with unsaturated or aromatic hydrocarbon residue, which in addition to nitrogen functionality may be functionalized by a radical selected from the group consisting of amino, cyano, thio, oxo and ester, and combinations thereof, and a is a number varying from 0 to 2, (F) 10 to 40 parts by weight vinyl terminated linear diorganopolysiloxane fluid having a viscosity varying from 100 to 50,000 centipoise at 25° C., wherein the organo groups are monovalent hydrocarbon radicals and wherein said diorganopolysiloxane fluid is a dispersant for filler, and (G) 5 to 100 parts by weight of an extending filler, 1 to 50 parts by weight of a reinforcing filler, or mixture thereof.

Claim 3

The composition of claim 1 wherein the vinyl terminated diorganopolysiloxane fluid is a vinyl-terminated dimethylpolysiloxane having a viscosity varying from 100 to 10,000 centipoise at 25° C.

Claim 4

The composition of claim 2 wherein mixture comprises 0.01 to 1 part polyalkylene polyol.

Claim 5

The composition of claim 1 wherein the silanol endstopped diorganopolysiloxane is a blend of two or more silanol endstopped polymers, wherein at least one of the polymers has a viscosity in the range of 1000 to 10,000 centipoise at 25° C. and at least one of the polymers has a viscosity in the range of 10 to 1500 centipoise at 25° C.

Claim 6

The composition of claim 1 wherein in the resinous copolymer R is methyl and the ratio of (CH 3 ) SiO 0 .5 units to SiO 2 units ranges from 0.525 to 1 to 0.775 to 1.

Claim 7

The composition of claim 1 wherein the alkyl silicate is tetraethyl orthosilicate.

Claim 8

The composition of claim 1 wherein the self-bonding additive is gamma-aminopropyltriethoxysilane.

Claim 9

The composition of claim 1 wherein the tin salt of a carboxylic acid is dibutyltindilaurate.

Claim 10

A process for forming a self-bonding, solventless, room temperature vulcanizable silicone rubber composition comprising: (a) mixing (1) 100 parts by weight of a first mixture comprising: (A) 83 to 98.6 parts by weight of a silanol endstopped diorganopolysiloxane polymer having a viscosity varying from 100 to centipoise at 25° C., wherein the organo groups are monovalent hydrocarbon radicals, and 1.4 to 17 parts by weight of resinous copolymer comprising R 3 SiO 0 .5 units and SiO 2 units, wherein R is a monovalent hydrocarbon radical and wherein said copolymer has from 0.5 to 1 R 3 SiO 0 .5 unit per SiO 2 unit; and (2) 1 to 20 parts by weight of a reacted catalyst mixture comprising: (C) 10 to 50 parts by weight of an alkyl silicate of the formula (R.sup.1).sub.m Si(OR.sup.2).sub.4-m and partial hydrolysis products thereof, wherein R 1 and R 2 are monovalent hydrocarbon radicals, m is 0 or 1, and which is pre-reacted with (D) 10 parts by weight of a tin salt of a carboxylic acid, (E) 10 to 30 parts by weight of a self-bonding additive having the formula ##STR7## wherein R 3 is a monovalent hydrocarbon radical, E is a hydrolyzable group selected from the group consisting of alkoxy, phenoxy, amino and dialkylamino, and θ is a nitrogen functional radical which is reacted with unsaturated or aromatic hydrocarboh residue, which in addition to nitrogen functionality may be functionalized by a radical selected from the group consisting of amino, cyano, thio, oxo and ester, and combinations thereof, and a is a number varying from 0 to 2, (F) 10 to 40 parts by weight vinyl terminated linear diorganopolysiloxane fluid having a viscosity varying from 100 to 50,000 centipoise at 25° C., wherein the organo groups are monovalent hydrocarbon radicals and wherein said diorganopolysiloxane fluid is a dispersant for filler, and (G) 5 to 100 parts by weight of an extending filler, 1 to 50 parts by weight of a reinforcing filler, or mixture thereof.

Claim 11

A process for forming a self-bonding, solventless, room temperature vulcanizable silicone rubber composition comprising: (a) mixing (1) 100 parts by weight of a first mixture comprising: (A) 83 to 98.6 parts by weight of a silanol endstopped diorganopolysiloxane polymer having a viscosity varying from 100 to centipoise at 25° C., wherein the organo groups are monovalent hydrocarbon radicals, and 1.4 to 17 parts by weight of resinous copolymer comprising R 3 SiO 0 .5 units and SiO 2 units, wherein R is a monovalent hydrocarbon radical and wherein said copolymer has from 0.5 to 1 R 3 SiO 0 .5 unit per SiO 2 unit; and (2) 1 to 20 parts by weight of a reacted catalyst mixture comprising: (C) 10 to 50 parts by weight of an alkyl silicate of the formula (R.sup.1).sub.m Si(OR.sup.2).sub.4-m and partial hydrolysis products thereof, wherein R 1 and R 2 are monovalent hydrocarbon radicals, m is 0 or 1, and which is pre-reacted with (D) 10 parts by weight of a tin salt of a carboxylic acid, (E) 10 to 30 parts by weight of a self-bonding additive having the formula ##STR7## wherein R 3 is a monovalent hydrocarbon radical, E is a hydrolyzable group selected from the group consisting of alkoxy, phenoxy, amino and dialkylamino, and θ is a nitrogen functional radical which is reacted with unsaturated or aromatic hydrocarboh residue, which in addition to nitrogen functionality may be functionalized by a radical selected from the group consisting of amino, cyano, thio, oxo and ester, and combinations thereof, and a is a number varying from 0 to 2, (F) 10 to 40 parts by weight vinyl terminated linear diorganopolysiloxane fluid having a viscosity varying from 100 to 50,000 centipoise at 25° C., wherein the organo groups are monovalent hydrocarbon radicals and wherein said diorganopolysiloxane fluid is a dispersant for filler, and (G) 5 to 100 parts by weight of an extending filler, 1 to 50 parts by weight of a reinforcing filler, or mixture thereof.

Claim 12

The process of claim 9 wherein the vinyl terminated diorganopolysiloxane fluid is a vinyl terminated dimethylpolysiloxane having a viscosity varying from 100 to 10,000 centipoise at 25° C.

Claim 13

The process of claim 10 wherein mixture (2) further comprises 0.01 to 1 part polyalkylene polyol.

Claim 14

The process of claim 9 wherein the silanol endstopped diorganopolysiloxane is a blend of two or more silanol endstopped polymers, wherein at least one of the polymers has a viscosity in the range of 1000 to 10,000 centipoise at 25° C. and at least one of the polymers has a viscosity in the range of 10 to 1500 centipoise at 25° C.

Claim 15

The process of claim 9 wherein in the resinous copolymer R is methyl and the ratio of (CH 3 ) 3 SiO 0 .5 units to SiO 2 units ranges from 0.525 to 1 to 0.775 to 1.

Claim 16

The process of claim 9 wherein the alkyl silicate is tetraethyl orthosilicate.

Claim 17

The process of claim 9 the self-bonding additive is gamma-aminopropyltriethoxysilane.

Claim 18

The process of claim 9 wherein the tin salt of a carboxylic acid is dibutyltindilaurate.