Composition for promoting adhesion of curable silicones to substrates

Claim 2

A self-bonding, low modulus, one-package room temperature vulcanizing silicone composition, having superior adhesion to substrates, comprising: i. a silanol chain-stopped diorganopolysiloxane, ii. a tri- or tetrafunctional, hydroxy-reactive silane or polysilane crosslinker therefor, iii. a catalyst capable of promoting the reactions between (i) and (ii), and iv. a small, effective, adhesion promoting amount of a composition comprising predominantly a compound of the formula: ##STR11## wherein G is hydrogen or a group of the formula: ##STR12## wherein R is a divalent radical selected from alkylene-arylene, alkylene and cycloalkylene of up to 8 carbon atoms, R 1 and R 3 , independently, are radicals of up to 8 carbon atoms selected from hydrocarbyl or halohydrocarbyl, R 2 is a radical of up to 8 carbon atoms selected from hydrocarbyl, halohydrocarbyl or cyanohydrocarbyl, and a is 0 to 3, or a mixture of such compounds.

Claim 3

A composition as defined in claim 1 wherein said catalyst (iii) is a silanol reactive organometallic ester compound of a metal and the weight ratio of components (iii) to (ii) is always at least 0.5 to 1.

Claim 4

A composition as defined in claim 1 wherein said adhesion promoter (iv) is predominantly of the formula: ##STR13##

Claim 5

A composition as defined in claim 1 wherein said adhesion promoter is predominantly of the formula: ##STR14##

Claim 6

A composition as defined in claim 1 wherein said adhesion promoter is predominantly a mixture of compounds of the formulae: ##STR15##

Claim 7

A process for producing a self-bonding, one-package room temperature vulcanizing silicone composition, having superior adhesion to substrates, said process comprising adding to a composition comprising: i. a silanol chain-stopped diorganosiloxane, ii. a tri- or tetrafunctional, hydroxy-reactive silane or polysilane crosslinker therefor, and iii. a catalyst capable of promoting the reactions between (i) and (ii), a small, effective, adhesion promoting amount of a composition comprising predominantly a compound of the formula: ##STR16## wherein G is hydrogen or a group of the formula: ##STR17## wherein R is a divalent radical selected from alkylene-arylene, alkylene and cycloalkylene of up to 8 carbon atoms, R 1 and R 3 , independently, are radicals of up to 8 carbon atoms selected from hydrocarbyl or halohydrocarbyl, R 2 is a radical of up to 8 carbon atoms selected from hydrocarbyl, halohydrocarbyl or cyanohydrocarbyl, and a is 0 to 3, or a mixture of such compounds.

Claim 8

A process for producing a self-bonding, one-package room temperature vulcanizing silicone composition, having superior adhesion to substrates, said process comprising adding to a composition comprising: i. a silanol chain-stopped diorganosiloxane, ii. a tri- or tetrafunctional, hydroxy-reactive silane or polysilane crosslinker therefor, and iii. a catalyst capable of promoting the reactions between (i) and (ii), a small, effective, adhesion promoting amount of a composition comprising predominantly a compound of the formula: ##STR16## wherein G is hydrogen or a group of the formula: ##STR17## wherein R is a divalent radical selected from alkylene-arylene, alkylene and cycloalkylene of up to 8 carbon atoms, R 1 and R 3 , independently, are radicals of up to 8 carbon atoms selected from hydrocarbyl or halohydrocarbyl, R 2 is a radical of up to 8 carbon atoms selected from hydrocarbyl, halohydrocarbyl or cyanohydrocarbyl, and a is 0 to 3, or a mixture of such compounds.

Claim 9

In a self-bonding, low modulus, one-package room temperature vulcanizing silicone composition having superior adhesion to substrates comprising (i) a silanol chain-stopped diorganopolysiloxane, (ii) a tri- or tetrafunctional, hydroxy reactive silane or polysilane crosslinker therefor, (iii) a catalyst capable of promoting the reactions between (i) and (ii), and (iv) a nitrogen functional silane adhesion promoter, the improvement which comprises using as said nitrogen functional silane adhesion promoter a small, effective, adhesion promoting amount of a composition predominantly a compound of the formula: ##STR18## wherein G is hydrogen or a group of the formula: ##STR19## wherein R is a divalent radical selected from alkylene-arylene, alkylene and cycloalkylene of up to 8 carbon atoms, R 1 and R 3 , independently, are radicals of up to 8 carbon atoms selected from hydrocarbyl or halohydrocarbyl, R 2 is a radical of up to 8 carbon atoms selected from hydrocarbyl, halohydrocarbyl or cyanohydrocarbyl, and a is 0 to 3, or a mixture of such compounds.

Claim 10

In a self-bonding, low modulus, one-package room temperature vulcanizing silicone composition having superior adhesion to substrates comprising (i) a silanol chain-stopped diorganopolysiloxane, (ii) a tri- or tetrafunctional, hydroxy reactive silane or polysilane crosslinker therefor, (iii) a catalyst capable of promoting the reactions between (i) and (ii), and (iv) a nitrogen functional silane adhesion promoter, the improvement which comprises using as said nitrogen functional silane adhesion promoter a small, effective, adhesion promoting amount of a composition predominantly a compound of the formula: ##STR18## wherein G is hydrogen or a group of the formula: ##STR19## wherein R is a divalent radical selected from alkylene-arylene, alkylene and cycloalkylene of up to 8 carbon atoms, R 1 and R 3 , independently, are radicals of up to 8 carbon atoms selected from hydrocarbyl or halohydrocarbyl, R 2 is a radical of up to 8 carbon atoms selected from hydrocarbyl, halohydrocarbyl or cyanohydrocarbyl, and a is 0 to 3, or a mixture of such compounds.

Claim 11

A composition as defined in claim 7 wherein said catalyst (iii) is a silanol reactive organometallic ester compound of a metal and the weight ratio of components (iii) to (ii) is always at least 0.5 to 1.

Claim 12

A composition as defined in claim 7 wherein said adhesion promoter (iv) is predominantly of the formula: ##STR20##

Claim 13

A composition as defined in claim 7 wherein said adhesion promoter is predominantly of the formula: ##STR21##

Claim 14

A composition as defined in claim 7 wherein said adhesion promoter is predominantly a mixture of compounds of the formulae: ##STR22##

Claim 15

In a process for producing a self-bonding one-package room temperature vulcanizing silicone composition having superior adhesion to substrates comprising adding to a composition comprising: i. a silanol chain-stopped diorganosiloxane, ii. a tri- or tetrafunctional, hydroxy-reactive silane or polysilane crosslinker therefor, iii. a catalyst capable of promoting the reactions between (i) and (ii), and iv. a nitrogen functional silane adhesion promoter; the improvement which comprises using as said nitrogen functional silane adhesion promoter a small, effective, adhesion promoting amount of a composition comprising predominantly a compound of the formula: ##STR23## wherein G is hydrogen or a group of the formula: ##STR24## wherein R is a divalent radical selected from alkylene-arylene, alkylene and cycloalkylene of up to 8 carbon atoms, R 1 and R 3 , independently, are radicals of up to 8 carbon atoms selected from hydrocarbyl or halohydrocarbyl, R 2 is a radical of up to 8 carbon atoms selected from hydrocarbyl, halohydrocarbyl or cyanohydrocarbyl, and a is 0 to 3, or a mixture of such compounds.

Claim 16

In a process for producing a self-bonding one-package room temperature vulcanizing silicone composition having superior adhesion to substrates comprising adding to a composition comprising: i. a silanol chain-stopped diorganosiloxane, ii. a tri- or tetrafunctional, hydroxy-reactive silane or polysilane crosslinker therefor, iii. a catalyst capable of promoting the reactions between (i) and (ii), and iv. a nitrogen functional silane adhesion promoter; the improvement which comprises using as said nitrogen functional silane adhesion promoter a small, effective, adhesion promoting amount of a composition comprising predominantly a compound of the formula: ##STR23## wherein G is hydrogen or a group of the formula: ##STR24## wherein R is a divalent radical selected from alkylene-arylene, alkylene and cycloalkylene of up to 8 carbon atoms, R 1 and R 3 , independently, are radicals of up to 8 carbon atoms selected from hydrocarbyl or halohydrocarbyl, R 2 is a radical of up to 8 carbon atoms selected from hydrocarbyl, halohydrocarbyl or cyanohydrocarbyl, and a is 0 to 3, or a mixture of such compounds.