Organosilicon primer compositions
AssigneeDow Corning Corporation
InventorEdwin P. Plueddemann
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Abstract
This invention provides novel silanes and bis-silylhydrocarbons that contain a plurality of silicon-bonded alkoxy groups and at least one substituent that is bonded to silicon through oxygen and contains at least four carbon atoms, two of which form a terminal group of the formula CH.sub.2 .dbd.CH--. A preferred class of these compounds will cohesively bond polyorganosiloxane elastomers and resins to both organic and inorganic substrates.
Claims10
A primer composition for adhering a curable polyorganosiloxane elastomer composition to an inorganic substrate, said primer composition comprising an organosilicon compound having a general formual selected from the group consisting of
- (R.sup.1 O).sub.n (R.sup.2 O).sub.4-n-p R.sup.3.sub.p Si,
- R.sup.4 [OSi(OR.sup.2).sub.3-p R.sup.3.sub.p ].sub.2,
- (R.sup.1 O).sub.n (R.sup.2 O).sub.3-n SiR.sup.5 Si(OR.sup.1).sub.2 (OR.sup.2).sub.3-r,
- and
- R.sup.4 [OSi(OR.sup.2).sub.2 R.sup.5 Si(OR.sup.2).sub.3 ].sub.2,
- where
- R.sup.1 represents a radical selected from the group consisting of
- CH.sub.2 .dbd.CHCH.sub.2 R.sup.6 --,
- CH.sub.2 .dbd.CHR.sup.6 OR.sup.7 --,
- CH.sub.2 .dbd.CHR.sup.6 OC(O)R.sup.8 --,
- CH.sub.2 .dbd.CHR.sup.9 C(O)OR.sup.7 --,
- and
- (CH.sub.2 .dbd.CHR.sup.6 O).sub.2 R.sup.10 --;
- R.sup.2 and R.sup.3 are methyl;
- R.sup.4 represents a radical selected from the group consisting of
- CH.sub.2 .dbd.CHR.sup.10 <,
- CH.sub.2 .dbd.CHR.sup.6 OR.sup.10 <,
- CH.sub.2 .dbd.CHR.sup.6 OC(O)R.sup.10 .dbd.
- and
- CH.sub.2 .dbd.CHR.sup.9 C(O)OR.sup.10 .dbd.;
- R.sup.5 represents ethylene;
- R.sup.6 represents a hydrocarbylene or substituted hydrocarbylene radical where the substituent is hydroxyl or alkoxy;
- R.sup.7 is selected from the same group as R.sup.6 or represents an allyloxy-substituted hydrocarbylene radial, with the proviso that R.sup.7 contains at least 2 carbon atoms;
- R.sup.8 is selected from the same group as R.sup.6 ;
- R.sup.9 represents a single bond or a radical selected from the same group as R.sup.6 ;
- R.sup.10 represents a trivalent hydrocarbon radical;
- n is 1 or 2;
- p is 0 or 1;
- r is 0 or 1;
- and 4-n-p is at least 2.
Dependencies are inferred from the claim text.