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US 5,684,110 AGranted
Silicone rubber composition for formed-in-place gaskets
AssigneeDow Corning Toray Silicone Co., Ltd.
InventorNaoji Kawamura
Life of this patent
Estimating the term…
Abstract
A silicone rubber composition which can be used to provide a formed-in-place gasket which exhibits excellent pressure resistance immediately after its site application and cures into a highly pressure-resistant and strongly adherent silicone rubber gasket comprising (A) 100 weight parts of a mixture of comprising an alkoxy-substituted polyorganosiloxane and an alkenyl-substituted polyorganosiloxane; (B) a hydrogen-containing polyorganosiloxane an alkoxysilane; a condensation reaction catalyst; and platinum catalyst.
Claims12
A silicone rubber composition, comprising
- (A) 100 parts by weight of a mixture comprising
- (a) 5 to 95 weight % of an alkoxy-substituted polyorganosiloxane having a viscosity at 25.degree. C. of 20 to 1,000,000 centipoise and containing an average of at least two silicon-bonded alkoxy groups per molecule;
- and
- (b) 95 to 5 weight % of an alkenyl-substituted polyorganosiloxane having a viscosity at 25.degree. C. of 20 to 1,000,000 centipoise and containing an average of at least two silicon-bonded lower alkenyl groups per molecule;
- and
- (B) a polyorganosiloxane containing an average of least two silicon-bonded hydrogen atoms per molecule, in a quantity that affords a value of 0.3 to 10 for the molar ratio of silicon-bonded hydrogen atoms to silicon-bonded lower alkenyl groups in component (b),
- (C) 0.01 to 20 parts by weight of an organosilicon compound selected from the group consisting of alkoxysilanes having the general formula
- R.sup.1.sub.a Si(OR.sup.2).sub.4-a
- and partial hydrolysis condensates thereof;
- wherein each R.sup.1 is selected from the group consisting of monovalent hydrocarbon groups, epoxy-functional organic groups, and acrylic-functional organic groups, R.sup.2 is alkyl or alkoxyalkyl, and a is 0, 1, or2;
- (D) 0.01 to 20 parts by weight of a condensation reaction catalyst;
- and
- (E) a catalytic quantity of a platinum catalyst;
- wherein at least one R.sup.1 group is selected from the group consisting of epoxy-functional organic groups and acrylic-functional organic groups.
11 more elements
A product obtained from the incipient materials:
- (A) 100 parts by weight of a mixture comprising
- (a) 5 to 95 weight % of an alkoxy-substituted polyorganosiloxane having a viscosity at 25.degree. C. of 20 to 1,000,000 centipoise and containing an average of at least two silicon-bonded alkoxy groups per molecule;
- and
- (b) 95 to 5 weight % of an alkenyl-substituted polyorganosiloxane having a viscosity at 25.degree. C. of 20 to 1,000,000 centipoise and containing an average of at least two silicon-bonded lower alkenyl groups per molecule;
- and
- (B) a polyorganosiloxane containing an average of least two silicon-bonded hydrogen atoms per molecule, in a quantity that affords a value of 0.3 to 10 for the molar ratio of silicon-bonded hydrogen atoms to silicon-bonded lower alkenyl groups in component (b),
- (C) 0.01 to 20 parts by weight of an organosilicon compound selected from the group consisting of alkoxysilanes having the general formula
- R.sup.1.sub.a Si(OR.sup.2).sub.4-a
- and partial hydrolysis condensates thereof;
- wherein each R.sup.1 is selected from the group consisting of monovalent hydrocarbon groups, epoxy-functional organic groups, and acrylic-functional organic groups, R.sup.2 is alkyl or alkoxyalkyl, and a is 0, 1, or2;
- (D) 0.01 to 20 parts by weight of a condensation reaction catalyst;
- and
- (E) a catalytic quantity of a platinum catalyst;
- wherein at least one R.sup.1 group is selected from the group consisting of epoxy-functional organic groups and acrylic-functional organic groups.
11 more elements
Dependencies are inferred from the claim text.