beta-substituted organosilsesquioxane polymers

摘要

Silsesquioxane polymers that are useful for preparing SiO2-rich ceramic coatings are obtained as the polymeric reaction products from the hydrolysis and condensation of organosilanes having a beta-substituted alkyl group. A preferred silsesquioxane polymer is the polymeric reaction product obtained from beta-chloroethyltrichlorosilane. More preferred silsesquioxones are those with non-halogenated alkyl groups, such as the beta-acetoxyethyl- and beta-hydroxyethyl-silsesquioxones. Coating compositions containing such silsesquioxane polymers dissolved in organic solvent may be applied to a substrate and converted to SiO2-rich ceramic thin layers by evaporating the solvent and heating the coated substrate at moderate temperatures.