Self-bonding one-component RTV silicone rubber compositions
AssigneeGeneral Electric Company Silicone Products Business Division
InventorsWarren R. Lampe, Tyrone D. Mitchell, James A. Cella
Life of this patent
Estimating the term…
Abstract
A self-bonding additive for a dimedone functional one-component RTV in which the self-bonding agent is a dialkoxydisilylether functional silane.
Claims64
A self-bonding one-component RTV silicone rubber composition comprising (A) 100 parts by weight of an organopolysiloxane consisting essentially of chemically combined units of the formula, ##STR21## and having terminal alkoxysiloxy units of the formula, ##STR22## where R is a C.sub.(1-13) monovalent organic radical, R.sup.1 is selected from hydrogen, halogen and R, R.sup.2 is a C.sub.(1-8) alkyl radical, X and Y are divalent radicals selected from --O--, --S-- and ##STR23## Z is a divalent C.sub.(1-13) organic radical selected from alkylene, cycloalkylene, arylene and a fused ring structure, b and c are equal to 0 or 1, R.sup.3 is selected from hydrogen and R, e is a whole number having a value of 0 or 1, g is equal to 1 or 2, and the sum of e+g is equal to 1 or 2;
- (B) from 0.1 to 5 parts by weight of an adhesion promoter of the formula, ##STR24## where X, Y, Z, R.sup.1, b and c are as previously defined and R.sup.4 is a C.sub.(4-8) monovalent hydrocarbon radical.
A self-bonding one-component RTV silicone rubber composition comprising (A) 100 parts by weight of a silanol end-stopped polymer of the formula, ##STR25## where s varies such that the viscosity of the polymer varies from 100 to 1,000,000 centipoise at 25.degree. C.;
- (B) from 0.1 to 10 parts by weight of a silyl ether cross-linking agent of the formula, ##STR26## where Q is a hydrolyzable radical, R is a C.sub.(1-13) monovalent organic radical, R.sup.1 is selected from hydrogen, halogen, and R, R.sup.2 is a C.sub.(1-8) alkyl radical, X and Y are divalent radicals selected from --O--, --S-- and ##STR27## Z is a divalent C.sub.(1-13) organic radical selected from alkylene, cycloalkylene, arylene and a fused ring structure, b and c are equal to 0 or 1, R.sup.3 is selected from hydrogen and R, e is a whole number having a value of 0 or 1, g is equal to 1 or 2, and the sum of e+g is equal to 1 or 2;
- and (C) from 0.1 to 5 parts by weight of an adhesion promoter of the formula, ##STR28## where X, Y, Z, R.sup.1, b, c are as previously defined and R.sup.4 is a C.sub.(4-8) monovalent hydrocarbon radical.
A self-bonding one-component RTV silicone rubber composition comprising (A) 100 parts by weight of an organopolysiloxane consisting essentially of chemically combined units of the formula, ##STR29## and having terminal siloxy units of the formula, ##STR30## where R is a C.sub.(1-13) monovalent organic radical, R.sup.1 is selected from hydrogen, halogen and R, X and Y are divalent radicals selected from --O--, --S-- and ##STR31## Z is a divalent C.sub.(1-13) organic radical selected from alkylene, cycloalkylene, arylene and a fused ring structure, b and c are equal to 0 or 1, R.sup.3 is selected from hydrogen and R and d is a whole number having a value of 0 or 1, R.sup.5 is a C.sub.(1-13) monovalent organic radical, and (B) from 0.1 to 5 parts by weight an adhesion promoter of the formula, ##STR32## where X, Y, Z, R.sup.1, b, c are as previously defined and R.sup.4 is a C.sub.(4-8) monovalent hydrocarbon radical.
A self-bonding one-component RTV silicone rubber composition comprising (A) 100 parts by weight of a silanol end-stopped polymer of the formula, ##STR33## where s varies such that the viscosity of the polymer varies from 100 to 1,000,000 centipoise at 25.degree. C.;
- (B) from 0.1 to 10 parts by weight of a silyl ether cross-linking agent of the formula, ##STR34## where Q is a hydrolyzable radical, R is a C.sub.(1-13) monovalent organic radical, R.sup.1 is selected from hydrogen, halogen and R, X and Y are divalent radicals selected from --O--, --S-- and ##STR35## Z is a divalent C.sub.(1-13) organic radical selected from alkylene, cycloalkylene, arylene and a fused ring structure, b and c are equal to 0 or 1, R.sup.3 is selected from hydrogen and R, and d is a whole number having a value of 0 or 1, R.sup.5 is a C.sub.(1-13) monovalent organic radical;
- and (C) from 0.1 to 5 parts by weight of an adhesion promoter of the formula, ##STR36## where X, Y, Z, R.sup.1, c are previously defined and R.sup.4 is a C.sub.(4-8) monovalent hydrocarbon radical.
A process for forming a self-bonding one-component RTV silicone rubber composition comprising (1) mixing (A) 100 parts by weight of a silanol end-stopped polymer of the formula, ##STR37## where s varies such that the viscosity of the polymer varies from 100 to 1,000,000 centipoise at 25.degree. C. (B) from 0.1 to 10 parts by weight of silyl ether crosslinking agent of the formula, ##STR38## where Q is a hydrolyzable radical, R is a C.sub.(1-13) monovalent organic radical, R.sup.1 is selected from hydrogen, halogen, and R, R.sup.2 is a C.sub.(1-8) alkyl radical, X and Y are divalent radicals selected from --O--, --S-- and ##STR39## S is a divalent C.sub.(1-13) organic radical selected from alkylene, cycloalkylene, arylene and a fused ring structure, b and c are equal to 0 or 1, R.sup.3 is selected from hydrogen and R, e is a whole number having a value of 0 or 1, g is equal to 1 or 2, and the sum of e+g is equal to 1 or 2;
- and (C) from 0.1 to 5 parts by weight of an adhesion promoter of the formula, ##STR40## where X, Y, Z, R.sup.1, b, c are as previously defined and R.sup.4 is a C.sub.(4-8) monovalent hydrocarbon radical;
- (2) allowing the composition to cure at room temperature
A process for forming self-bonding one-component RTV silicone rubber compositions comprising (1) mixing (A) 100 parts by weight of a silanol end-stopped polymer of the formula, ##STR41## where s varies such that the viscosity of the polymer varies from 100 to 1,000,000 centipoise at 25.degree. C.;
- (B) from 0.1 to 10 parts by weight of a silyl ether crosslinking agent of the formula, ##STR42## where Q is a hydrolyzable radical, R is a C.sub.(1-13) monovalent organic radical, R.sup.1 is selected from hydrogen, halogen and R, X, and Y are divalent radicals selected from --O--, --S-- and ##STR43## Z is a divalent C.sub.(1-13) organic radical selected from alkylene, cycloalkylene, arylene and a fused ring structure, b and c are equal to 0 or 1, R.sup.3 is selected from hydrogen and R, and d is a whole number having a value of 0 or 1, R.sup.5 is a C.sub.(1-13) monovalent organic radical;
- and (C) from 0.1 to 5 parts by weight of an adhesion promoter of the formula, ##STR44## where X, Y, Z, R.sup.1, c are previously defined and R.sup.4 is a C.sub.(4-8) monovalent hydrocarbon radical;
- (2) allowing the composition to cure at room temperature to a silicone elastomer.
An article of manufacture comprising a laminate of metallic substrate and a one-component self-bonding RTV silicone rubber composition comprising (1) a substrate selected from a metal, plastic or glass and (2) having thereover a layer of self-bonding one-component RTV silicone rubber composition having (A) 100 parts by weight of an organopolysiloxane consisting essentially of chemically combined units of the formula, ##STR45## and having terminal alkoxysiloxy units of the formula, ##STR46## where R is a C.sub.(1-13) monovalent organic radical, R.sup.1 is selected from hydrogen, halogen and R, R.sup.2 is a C.sub.(1-8) alkyl radical, X and Y are divalent radicals selected from --O--, --S-- and ##STR47## Z is a divalent C.sub.(1-13) organic radical selected from alkylene, cycloalkylene, arylene and a fused ring structure, b and c are equal to 0 or 1, R.sup.3 is selected from hydrogen and R, e is a whole number having a value of 0 or 1, g is equal to 1 or 2, and the sum of e+g is equal to 1 or 2;
- (B) from 0.1 to 5 parts by weight of an adhesion promoter of the formula, ##STR48## where X, Y, Z, R.sup.1, b and c are as previously defined and R.sup.4 is a C.sub.(4-8) monovalent hydrocarbon radical.
A laminate of a substrate and a silicone rubber composition comprising (1) a substrate selected from metallic substrates, plastic substrates and glass substrates and (2) a layer over said substrate of a self-bonding one-component RTV silicone rubber composition having (A) 100 parts by weight of a silanol end-stopped polymer of the formula, ##STR49## where s varies such that the viscosity of the polymer varies from 100 to 1,000,000 centipoise at 25.degree. C.;
- (B) from 0.1 to 10 parts by weight of a silyl ether crosslinking agent of the formula, ##STR50## where Q is a hydrolyzable radical, R is a C.sub.(1-13) monovalent organic radical, R.sup.1 is selected from hydrogen, halogen, and R, R.sup.2 is a C.sub.(1-8) alkyl radical, X and Y are divalent radicals selected from --O--, --S-- and ##STR51## Z is a divalent C.sub.(1-13) organic radical selected from alkylene, cycloalkylene, arylene and a fused ring structure, b and c are equal to 0 or 1, R.sup.3 is selected from hydrogen and R, e is a whole number having a value of 0 to 1, g is equal to 1 or 2, and the sum of e+g is equal to 1 or 2;
- and (C) from 0.1 to 5 parts by weight of an adhesion promoter of the formula, ##STR52## where X, Y, Z, R.sup.1, b, c are as previously defined and R.sup.4 is a C.sub.(4-8) monovalent hydrocarbon radical.
A laminate of a substrate and a silicone elastomer comprising (1) a substrate selected from metallic substrates, plastic substrates, glass substrates and (2) applied over the substrate a layer of self-bonding one-component RTV silicone rubber composition having (A) 100 parts by weight of an organopolysiloxane consisting essentially of chemically combined units of the formula, ##STR53## and having terminal siloxy units of the formula, ##STR54## where R is a C.sub.(1-13) monovalent organic radical, R.sup.1 is selected from hydrogen, halogen and R, X, and Y are divalent radicals selected from --O--, --S-- and ##STR55## Z is a divalent C.sub.(1-13) organic radical selected from alkylene, cycloalkylene, arylene and a fused ring structure, b and c are equal to 0 or 1, R.sup.3 is selected from hydrogen and R, and d is a whole number having a value of 0 or 1, R.sup.5 is a C.sub.(1-13) monovalent organic radical, and (B) from 0.1 to 5 parts by weight of an adhesion promoter of the formula ##STR56## where X, Y, Z, R.sup.1, b, c are as previously defined and R.sup.4 is a C.sub.(4-8) monovalent hydrocarbon radical.
The laminate of claim 55 wherein there is further present from 0.01 to 10 parts by weight of a curing promoter which is a metal salt of a carboxylic acid and R.sup.4 in the adhesion promoter is tertiary butyl.
A laminate of a substrate and a silicone elastomer comprising (1) a substrate selected from the class consisting of metallic substrates, plastic substrates and glass substrates and (2) applied over the substrate a layer of a self-bonding one-component RTV silicone rubber composition having (A) 100 parts by weight of a silanol end-stopped polymer of the formula, ##STR57## where s varies such that the viscosity of the polymer varies from 100 to 1,000,000 centipoise at 25.degree. C.;
- (B) from 0.1 to 10 parts by weight of a silyl ether crosslinking agent of the formula, ##STR58## where Q is a hydrolyzable radical, R is a C.sub.(1-13) monovalent organic radical, R.sup.1 is selected from hydrogen, halogen and R, X and Y are divalent radicals selected from --O--, --S-- and ##STR59## Z is a divalent C.sub.(1-13) organic radical selected from alkylene, cycloalkylene, arylene and a fused ring structure, b and c are equal to 0 or 1, R.sup.3 is selected from hydrogen and R, and d is a whole number having a value of 0 or 1, R.sup.5 is a C.sub.(1-13) monovalent organic radical;
- and (C) from 0.1 to 5 parts by weight of an adhesion promoter of the formula, ##STR60## where X, Y, Z, R.sup.1, c are previously defined and R.sup.4 is a C.sub.(4-8) monovalent hydrocarbon radical.
Dependencies are inferred from the claim text.