Self-adhesive silicone rubber composition and silicone rubber coated-fabric material
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsTakeshi Fukuda, Shiniti Ide, Motoo Fukushima
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Abstract
A novel self-adhesive silicone rubber composition is disclosed which gives a cured silicone rubber capable of being firmly bonded to the surface of various kinds of substrate materials even without the pre-treatment of the substrate surface with a primer so that the composition is useful as a coating material in the preparation of a silicone rubber-coated cloth advantageous in respect of the firm adhesion of the cured silicone rubber layer to the substrate cloth. The composition is characterized by the formulation of a unique component which is an organosilane compound having an isocyanato-containing group and a hydrolyzable group in a molecule such as 3-isocyanatopropyl trimethoxy silane.
Claims8
A silicone rubber-coated fabric web which comprises:
- (A) a fabric web;
- and
- (B) a layer of a silicone rubber cured and bonded to at least one surface of the fabric web, said rubber being a cured self-adhesive silicone rubber composition
- which is a uniform blend comprising:
- (a) 100 parts by weight of an organopolysiloxane represented by the average unit formula
- R.sub.a SiO.sub.(4-a)/2'
- in which R is an unsubstituted or substituted monovalent hydrocarbon group and the subscript a is a positive number in the range from 1.98 to 2.01, and having a viscosity of at least 300 centistokes at 25.degree. C.;
- (b) from 0.1 to 20 parts by weight of an organosilane compound having, in a molecule, an isocyanato group --NCO and a hydrolyzable group represented by the formula
- R.sup.1.sub.b Si(OR.sup.1).sub.3-b (R.sup.2 --NCO),
- in which the group denoted by R.sup.1 is a monovalent hydrocarbon group or an alkoxy-substituted alkyl group, the group denoted by R.sup.2 is a divalent hydrocarbon group having 1 to 10 carbon atoms or an alkylene group having a sulfur atom between the carbon atoms forming a sulfide linkage and the subscript b is zero, 1 or 2, or a partial hydrolysis product thereof;
- and
- (c) a curing agent in an amount sufficient to cure the composition.
A method for preparing a fabric web coated with a silicone rubber, comprising coating a fabric substrate with a composition comprising
- (a) 100 parts by weight of an organopolysiloxane represented by the average unit formula
- R.sub.a SiO.sub.(4-a)/2'
- in which R is an unsubstituted or substituted monovalent hydrocarbon group and the subscript is a positive number in the range from 1.98 to 2.01, and having a viscosity of at least 300 centistokes at 25.degree. C.;
- (b) from 0.1 to 20 parts by weight of an organosilane compound having, in a molecule, an isocyanato group --NCO and a hydrolyzable group represented by the general formula
- R.sup.1.sub.b Si(OR.sup.1).sub.3-b (R.sup.2 --NCO),
- in which the group denoted by R.sup.1 is a monovalent hydrocarbon group or an alkoxy-substituted alkyl group, the group denoted by R.sup.2 is a divalent hydrocarbon group having 1 to 10 carbon atoms or an alkylene group having a sulfur atom between the carbon atoms forming a sulfide linkage and the subscript b is zero, 1 or 2, or a partial hydrolysis product thereof;
- (c) a curing agent in a amount sufficient to cure the composition;
- and curing said composition.
Dependencies are inferred from the claim text.