Adhesion additives and curable organosiloxane compositions containing same
AssigneeDow Corning Corporation
InventorsTheresa E. Gentle, Michael A. Lutz
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Abstract
The novel organosiloxane compounds of the present invention are characterized by the presence of 1) a silicon atom containing at least two alkoxy or other hydrolyzable groups and the group --OR.sup.1 Si.dbd. wherein R.sup.1 represents a divalent organic group comprising carbon, hydrogen, and, optionally, oxygen, and 2) a silicon bonded hydrogen atom or alkenyl radical. A preferred method for preparing the compounds is by the reaction of 1) a silane containing a silicon-bonded alkenyloxy group and at least two silicon-bonded hydrolyzable groups or a precursor of said hydrolyzable groups and 2) an organohydrogensiloxane. The reaction is conducted in the presence of a hydrosilation catalyst.
Claims7
An organosiloxane compound represented by the formula
- X.sub.m R.sup.2.sub.(3-m) SiOR.sup.1 [Si(R.sup.3).sub.3 ].sub.n
- wherein R.sup.1 contains at least 3 carbon atoms, exhibits a valence of n+1 wherein n is 1 or 2, and is selected from the group consisting of --R.sup.4 --, --R.sup.4 OR.sup.5 --, --R.sup.4 OC(O)R.sup.6 -- and --R.sup.7 C(O)OR.sup.5 -- when n is 1 and R.sup.1 is (--R.sup.4 O).sub.2 R.sup.8 -- when n is 2 and wherein R.sup.5, R.sup.6 and R.sup.8 are bonded to the oxygen atom in said formula;
- R.sup.4 represents a hydrocarbylene or substituted hydrocarbylene radical containing at least 3 carbon atoms wherein the substituent is hydroxyl or alkoxy;
- R.sup.5 contains from 2 to 12 carbon atoms and is selected from the group consisting of hydrocarbylene radicals and allyloxy-substituted hydrocarbylene radicals;
- R.sup.6 represents a hydrocarbylene or substituted hydrocarbylene radical containing at least 3 carbon atoms wherein the substituent is hydroxyl or alkoxy;
- R.sup.7 is selected from the group consisting of R.sup.6 and a single bond;
- R.sup.8 represents a trivalent hydrocarbon radical;
- each R.sup.2 is individually selected from the group consisting of unsubstituted monovalent hydrocarbon radicals and substituted monovalent hydrocarbon radicals;
- each R.sup.3 is individually selected from the group consisting of unsubstituted and substituted monovalent hydrocarbon radicals, silicon bonded hydrogen atoms, X and siloxane units represented by the general formula --O[SiR.sup.9.sub.p O.sub.(3-p)/2 ].sub.q wherein q is at least 1 and said siloxane units are sequential when q is greater than 1;
- each R.sup.9 is individually selected from the group consisting of X, hydrogen, substituted and unsubstituted monovalent hydrocarbon radicals, X.sub.m R.sup.2.sub.3-m SiOR.sup.1 -- and --R.sup.11 [R.sup.10.sub.s SiO.sub.(3-s)/2 ].sub.r wherein r is at least 1 and the siloxane units represented by R.sup.10.sub.s SiO.sub.(3-s)/2 are sequential when r is greater than 1, with the proviso that at least one substituent represented by R.sup.3 contains a silicon-bonded hydrogen atom or alkenyl radical;
- each R.sup.10 is individually selected from the group consisting of monovalent hydrocarbon radicals, hydrogen and X;
- R.sup.11 represents a hydrocarbylene or substituted hydrocarbylene radical containing at least 2 carbon atoms wherein the substituent is hydroxyl or alkoxy;
- the substituents present on the substituted hydrocarbon radicals represented by R.sup.2, R.sup.3, R.sup.9, R.sup.10 and R.sup.11 are selected from the group consisting of halogen, epoxy, amino, mercapto and
- 3-methacryloxypropyl;
- X represents a hydrolyzable group;
- m is 2 or 3;
- n is 1 or 2;
- p is 0, 1, 2 or 3;
- and
- s is 0, 1, 2, or 3.
Dependencies are inferred from the claim text.