Claims
- 1. 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.
- 2. The web as claimed in claim 1 in which at least 50% by moles of the groups denoted by R in the component (a) are methyl groups.
- 3. The web as claimed in claim 1 in which the organopolysiloxane as the component (a) has a viscosity in the range from 1.times.10.sup.4 to 1.times.10.sup.8 centistokes at 25.degree. C.
- 4. The web as claimed in claim 1 in which the organosilane compound as the component (b) is selected from the group consisting of the compounds expressed by the structural formulas
- (MeO).sub.3 Si(C.sub.3 H.sub.6 --NCO); (EtO).sub.3 Si(C.sub.3 H.sub.6 --NCO);
- (CH.sub.2 =CMe--O).sub.3 Si(C.sub.3 H.sub.6 --NCO);
- (MeOC.sub.2 H.sub.4 O).sub.3 Si(C.sub.3 H.sub.6 --NCO); (MeO).sub.2 MeSi(C.sub.3 H.sub.6 --NCO);
- (MeO).sub.2 ViSi(C.sub.3 H.sub.6 --NCO); (MeO).sub.2 PhSi(C.sub.3 H.sub.6 --NCO);
- (EtO).sub.2 MeSi(C.sub.3 H.sub.6 --NCO); (MeO).sub.3 Si(C.sub.2 H.sub.4 --S--C.sub.3 H.sub.6 --NCO);
- and
- (MeO).sub.2 MeSi(C.sub.2 H.sub.4 --S--C.sub.3 H.sub.6 --NCO),
- in which Me, Et, Vi and Ph denote methyl, ethyl, vinyl and phenyl groups, respectively.
- 5. The web as claimed in claim 1 in which the curing agent is an organic peroxide.
- 6. The web as claimed in claim 5 in which the amount of the organic peroxide is in the range from 0.1 to 5 parts by weight per 100 parts by weight of the component (a).
- 7. The web as claimed in claim 1 in which the curing agent is a combination of an organohydrogenpolysiloxane and a platinum compound when the organopolysiloxane as the component (a) has at least two alkenyl groups bonded to the silicon atoms in a molecule.
- 8. 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.
Priority Claims (1)
Number |
Date |
Country |
Kind |
1-315585 |
Dec 1989 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 07/622,572 filed Dec. 5, 1990, now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (3)
Number |
Date |
Country |
2132797 |
Apr 1972 |
FRX |
2137217A |
Mar 1983 |
GBX |
8605798 |
Oct 1986 |
WOX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
622572 |
Dec 1990 |
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