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US 4,332,844 AGranted
Silicone compositions for adhesion and method for adhering silicone rubber to a substrate
AssigneeToray Silicone Company, Ltd.
InventorsMitsuo Hamada, Sadami Yasuda, Chiichiro Hasegawa
Life of this patent
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Abstract
A silicone composition prepared from an alkoxy-containing silicon compound, an organotitanate, and an organohydrogensilicon compound, optionally an organic solvent is useful for improving the adhesion between silicone rubber and a substrate.
Claims22
A silicone composition consisting of
- (A) 100 parts by weight of an organosilicon compound having an average unit formula ##EQU6## in which R.sup.1 represents a monovalent radical selected from the group consisting of hydrocarbon radicals and halogenated hydrocarbon radicals;
- R.sup.2 represents a monovalent organic radical containing a functional group selected from the group consisting of epoxy, methacryloxy, amino, and mercapto;
- R.sup.3 represents an alkyl radical;
- a has a value of 0 to 3 inclusive;
- b has a value of 0 to 3 inclusive;
- c has a value such that 0<c.ltoreq.4;
- and the sum of a+b+c has a value such that 0<a+b+c.ltoreq.4;
- and said organosilicon compound containing at least one silicon-bonded alkoxy radical per molecule,
- (B) 5 to 500 parts by weight of an organotitanate, and
- (C) 5 to 1000 parts by weight of an organohydrogensilicon compound having an average unit formula ##EQU7## in which R.sup.4 represents a monovalent radical selected from the group consisting of hydrocarbon radicals and halogenated hydrocarbon radicals;
- x has a value such that 0<x.ltoreq.3;
- y has a value such that 0<y.ltoreq.2;
- and the sum of x+y has a value such that 0<x+y.ltoreq.4;
- and said organohydrogensilicon compound contains at least one SiH per molecule.
11 more elements
A method for adhering silicone rubber to a substrate comprising
- applying a coating of a silicone composition to a substrate surface, said silicone composition consisting of (A) 100 parts by weight of an organosilicon compound having an average unit formula ##EQU8## in which R.sup.1 represents a monovalent radical selected from the group consisting of hydrocarbon radicals and halogenated hydrocarbon radicals;
- R.sup.2 represents a monovalent organic radical containing a functional group selected from the group consisting of epoxy, methacryloxy, amino, and mercapto;
- R.sup.3 represents an alkyl radical;
- a has a value of 0 to 3 inclusive;
- b has a value of 0 to 3 inclusive;
- c has a value such that 0<c.ltoreq.4;
- and the sum of a+b+c has a value such that 0<a+b+c.ltoreq.4;
- and said organosilicon compound containing at least one silicon-bonded alkoxy radical per molecule, (B) 5 to 500 parts by weight of an organotitanate, and (C) 5 to 1000 parts by weight of an organohydrogensilicon compound having an average unit formula ##EQU9## in which R.sup.4 represents a monovalent radical selected from the group consisting of hydrocarbon radicals and halogenated hydrocarbon radicals;
- x has a value such that 0<x.ltoreq.3;
- y has a value such that 0<y.ltoreq.2;
- and the sum of x+y has a value such that 0<x+y.ltoreq.4;
- and said organohydrogensilicon compound contains at least one SiH per molecule,
- drying the coating,
- applying an unvulcanized silicone rubber containing a curing catalyst over the dried coating, and thereafter
- curing the silicone rubber.
12 more elements
Dependencies are inferred from the claim text.