BETA-SUBSTITUTED ORGANOSILSESQUIOXANES AND USE THEREOF

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. 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.