SILSESQUIOXANE OLIGOMERS AND OPTICAL GLASS FIBER COATING COMPOSITIONS CONTAINING THE SAME

摘要

The present invention is directed to silsesquioxane oligomers substantially free of urethane groups that are the condensation reaction products of a polyhydroxy terminated silsesquioxane with a hydroxy functional ethylenically unsaturated monomer. Photopolymerizable liquid compositions including the oligomer are disclosed. The composition can be used as a single coat or secondary coating for an optical glass fiber which exhibits reduced oxidative degradation and high temperature weight loss. Furthermore, secondary coatings produced therefrom protect conventional primary coatings from these degradative influences.