Self-bonding one-component dimedone RTV silicone rubber compositions
AssigneeGeneral Electric Silicones
InventorsJohn J. Dziark, Kazuto Shinohara
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Abstract
The present invention relates to dimedone functional self-bonding room temperature vulcanizable silicone rubber compositions. The self-bond additive is selected from silyl maleates, silyl fumarates, silyl succinates, silyl isocyanurates and mixtures thereof. Preferably the self-bonding additive is prereacted with the cross-linking agent before they are incorporated into the RTV composition. This prereaction of the self-bonding additive and the cross-linking agent imparts shelf-stability to the composition.
Claims110
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, ##STR27## and having terminal alkoxysiloxy units of the formula, ##STR28## 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 ##STR29## 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 3 to 8 parts by weight of an adhesion promoter which is selected from the class consisting of silyl maleates, silyl fumarates, silyl succinates, silyl isocyanurates and mixtures thereof.
A self-bonding one-component RTV silicone rubber composition comprising (A) 100 parts by weight of a silanol end-stopped polymer of the formula, ##STR30## where s varies such that the viscosity of the polymer varies from 100 to 1,000,000 centipoise at 25.degree. C. and the reaction product of (B) from 0.1 to 10 parts by weight of a silyl ether cross-linking agent of the formula, ##STR31## 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 ##STR32## 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 3 to 8 parts by weight of an adhesion promoter selected from the class consisting of silyl maleates, silyl fumarates, silyl succinates, silyl isocyanurates, and mixtures thereof.
A self-bonding one-component RTV silicone rubber composition comprising (A) 100 parts by weight of a base organopolysiloxane consisting essentially of chemically combined units of the formula ##STR33## and having terminal siloxy units of the formula, ##STR34## 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 ##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 (B) from 3 to 8 parts by weight of an adhesion promoter selected from a class consisting of silyl maleates, silyl fumarates, silyl succinates, silyl isocyanurates, and mixtures thereof.
A self-bonding one-component RTV silicone rubber composition comprising (A) 100 parts by weight of a silanol end-stopped polymer of the formula, ##STR36## where s varies such that the viscosity of the polymer varies from 100 to 1,000,000 centipoise at 25.degree. C. and the reaction product of (B) from 0.1 to 10 parts by weight of a silyl ether cross-linking agent of the formula, ##STR37## 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 ##STR38## 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 3 to 8 parts by weight of an adhesion promoter selected from the class consisting of silyl maleates, silyl fumarates, silyl succinates, silyl isocyanurates, and mixtures thereof.
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, ##STR39## where s varies such that the viscosity of the polymer varies from 100 to 1,000,000 centipoise at 25.degree. C. with the reaction product of (B) from 0.1 to 10 parts by weight of a silyl ether cross-linking agent of the formula ##STR40## 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 ##STR41## 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;
- with (C) from 3 to 8 parts by weight of an adhesion promoter selected from the class consisting of silyl maleates, silyl fumarates, silyl succinates, silyl isocyanurates and mixtures thereof, and (2) allowing the composition to cure at room temperature.
A process for forming 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, ##STR42## where s varies such that the viscosity of the polymer varies from 100 to 1,000,000 centipoise at 25.degree. C., with the reaction product of (B) from 0.1 to 10 parts by weight of a silyl ether cross-linking agent of the formula, ##STR43## 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 ##STR44## Z is a divalent C.sub.(1-13) organic radical selected from alkylene, cyclalkylene, 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;
- with (C) from 3 to 8 parts by weight of an adhesion promoter selected from the class consisting of silyl maleates, silyl fumarates, silyl succinates, silyl isocyanurates and mixtures thereof, and (2) allowing the composition to cure at room temperature.
An article of manufacture comprising a laminate of a metallic substrate and a one-component self-bonding RTV silicone rubber composition, comprising, (1) a metallic substrate 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 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 3 to 8 parts by weight of an adhesion promoter selected from the class consisting of silyl maleates, silyl fumarates, silyl succinates, silyl isocyanurates and mixtures thereof.
A laminate of a substrate and a silicone rubber composition comprising (1) a metallic substrate 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. ##STR48## where s varies such that the viscosity of the polymer varies from 100 to 1,000,000 centipoise at 25.degree. C., with the reaction product of (B) from 0.1 to 10 parts by weight of a silyl ether cross-linking agent of the formula, ##STR49## 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 ##STR50## 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 3 to 8 parts by weight of an adhesion promoter selected from the class consisting of silyl maleates, silyl fumarates, silyl succinates, silyl isocyanurates and mixtures thereof.
A laminate of a substrate and a silicone elastomer comprising (1) a metallic substrate 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, ##STR51## and having terminal siloxy units of the formula, ##STR52## 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 ##STR53## 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 3 to 8 parts by weight of an adhesion promoter selected from the class consisting of silyl maleates, silyl fumarates, silyl succinates, silyl isocyanurates and mixtures thereof.
A laminate of a substrate and a silicone elastomer comprising (1) a metallic substrate and (2) applied over the substrate is 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, ##STR54## where s varies such that the viscosity of the polymer varies from 100 to 1,000,000 centipoise at 25.degree. C., with the reaction product of (B) from 0.1 to 10 parts by weight of a silyl ether cross-linking agent of the formula, ##STR55## 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 ##STR56## 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 3 to 8 parts by weight of an adhesion promoter selected from the class consisting of silyl maleates, silyl fumarates, silyl succinates, silyl isocyanurates and mixtures thereof.
Dependencies are inferred from the claim text.