Curable fluorinated organosiloxane compositions exhibiting improved adhesion
First Claim
1. A curable organosiloxane composition comprisingA. a polyorganosiloxane containing at least two silicon-bonded alkenyl radicals per molecule where at least 20 percent of the siloxane units contain a silicon-bonded perfluoroalkylethyl radical and the silicon atoms containing said alkenyl radicals are separated by at least two dimethylsiloxane units from the closest silicon atom containing said perfluoroalkylethyl radical;
- B. as the curing agent for said composition, an organohydrogensiloxane containing an average of more than two silicon-bonded hydrogen atoms per molecule;
C. an amount of a hydrosilation catalyst sufficient to promote curing of said composition, where said catalyst is selected from the group consisting of metals from the platinum group of the periodic table and compounds of these metals; and
D. as the adhesion promoter, an effective amount of an alkoxy-substituted organosilicon compound containing at least one organofunctional substituent bonded to silicon through carbon, where said substituent is selected from the group consisting of epoxy, amino, alkenyl, alkyl esters of ethylenically unsaturated carboxylic acids and polymers derived from said acids, and the concentration of said organosilicon compound is sufficient to achieve adhesion between said composition and a substrate in contact with said composition during curing.
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Accused Products
Abstract
The adhesion developed during curing of organosiloxane compositions comprising a polyorganosiloxane containing silicon-bonded alkenyl and fluorinated alkyl radicals, at least one organosiloxane as the curing agent, a platinum-containing hydrosilation catalyst and conventional organosiloxane adhesion promoters is substantially improved when the alkenyl-substituted siloxane units are separated from the closest fluorine-containing siloxane units by at least one dimethylsiloxane unit.
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Citations
6 Claims
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1. A curable organosiloxane composition comprising
A. a polyorganosiloxane containing at least two silicon-bonded alkenyl radicals per molecule where at least 20 percent of the siloxane units contain a silicon-bonded perfluoroalkylethyl radical and the silicon atoms containing said alkenyl radicals are separated by at least two dimethylsiloxane units from the closest silicon atom containing said perfluoroalkylethyl radical; -
B. as the curing agent for said composition, an organohydrogensiloxane containing an average of more than two silicon-bonded hydrogen atoms per molecule; C. an amount of a hydrosilation catalyst sufficient to promote curing of said composition, where said catalyst is selected from the group consisting of metals from the platinum group of the periodic table and compounds of these metals; and D. as the adhesion promoter, an effective amount of an alkoxy-substituted organosilicon compound containing at least one organofunctional substituent bonded to silicon through carbon, where said substituent is selected from the group consisting of epoxy, amino, alkenyl, alkyl esters of ethylenically unsaturated carboxylic acids and polymers derived from said acids, and the concentration of said organosilicon compound is sufficient to achieve adhesion between said composition and a substrate in contact with said composition during curing. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification