| abstract |
The invention is a method for preparing organic solvent-soluble polytitanosiloxanes that contain units with the formulas R¹ a R² (3-a) SiO 1/2 (M units), SiO 4/2 (Q units) and TiO 4/2 . Our method comprises hydrolyzing tetraalkyl titanate, or a partial hydrolyzate-condensate thereof, and tetraalkyl silicate, or a partial hydrolyzate-condensate thereof, using water in an amount which is less than 80% of the amount theoretically necessary for the hydrolysis of all the alkoxy groups, and reacting the cohydrolyzate-cocondensate with at least 1 silane with the formula R¹ a R² (3-a) SiOR³, where R¹ is hydrogen atom or a monovalent organic group, R² is a monovalent organic group, R³ is hydrogen atom or an acyl group having no more than 8 carbon atoms, and a is an integer with a value of 0 to 3. |