Method for preparation of carbinol-functional siloxanes
AssigneeDow Corning Corporation
InventorsGary T. Burns, Gary T. Decker, Aroop K. Roy
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Abstract
The present invention is a method for the preparation of carbinol-functional organosiloxanes and carbinol-functional organosiloxane resins. The method comprises contacting a cyclic silyl ether with an organosiloxane or an organosiloxane resin at a temperature within a range of about 25.degree. C. to 150.degree. C. The method may be conducted in the presence of an inert organic solvent to facilitate dissolution and contact of the reactants.
Claims25
A method for preparation of carbinol-functional organosiloxanes described by formula
- HO(CR.sup.1.sub.2).sub.b SiR.sub.2 O(SiR.sub.2 O).sub.n SiR.sub.2 (CR.sup.1.sub.2).sub.b OH,
- the method comprising:
- contacting a cyclic silyl ether described by formula ##STR2## with an organosiloxane described by formula
- HO(R.sub.2 SiO).sub.n H
- at a temperature within a range of about 25.degree. C. to 150.degree. C.:
- where each R is independently selected from a group consisting of alkyls comprising one to 20 carbon atoms, cycloalkyls comprising three to 20 carbon atoms, alkenyls comprising two to 20 carbon atoms, aralkyls, and aryls;
- each R.sup.1 is independently selected from a group consisting of hydrogen, R, and substituted hydrocarbyls comprising one to 20 carbon atoms;
- b=3, 4, or 5;
- and n=1 to 15,000.
A method for preparation of carbinol-functional organosiloxane resins described by formula
- (SiO.sub.2).sub.w (RSiO.sub.3/2).sub.x (R.sub.2 SiO).sub.y (R.sub.3 SiO.sub.1/2).sub.z {O.sub.1/2 SiR.sub.2 (CR.sup.1.sub.2).sub.b OH}.sub.a,
- the method comprising:
- contacting a cyclic silyl ether described by formula ##STR3## with an organosiloxane resin described by formula
- (SiO.sub.2).sub.w (RSiO.sub.3/2).sub.x (R.sub.2 SiO).sub.y (R.sub.3 SiO.sub.1/2).sub.z
- at a temperature within a range of about 25.degree. C. to 150.degree. C.;
- where each R is independently selected from a group consisting of alkyls comprising one to 20 carbon atoms, cycloalkyls comprising three to 20 carbon atoms, alkenyls comprising two to 20 carbon atoms, aralkyls, and aryls;
- each R.sup.1 is independently selected from a group consisting of hydrogen, R, and substituted hydrocarbyls comprising one to 20 carbon atoms;
- b=3, 4, or 5;
- the values w, x, y, z are mole percents, w<100, w+x>0, and w+x+y+z=100;
- the organosiloxane resin comprises greater than zero weight percent silanol to about 30 weight percent silanol, and the value a represents the percent of the silanol substituted with carbinol functional silyl and a>0.
Dependencies are inferred from the claim text.