Millen, White, Zelano, & Branigan, P.C.
Method for preparing partially tert-butoxylated poly(p-hydroxystyrene)
 A partially tert-butoxylated poly(p-hydroxystyrene) is prepared by subjecting poly(p-tert-butoxystyrene) to reaction of eliminating some of the tert-butoxy groups in an organic solvent at a temperature of 30.degree.-100.degree. C. in the presence of an acid catalyst at a molar ratio of acid catalyst/t-BuO group of from 0.050 to 2.0. During the elimination reaction, a change of solubility of the resulting partially tert-butoxylated poly(p-hydroxystyrene) is determined to calculate a degree of elimination of tert-butoxy groups. The reaction is terminated when a desired degree of elimination is reached. Through a simple process, partially tert-butoxylated poly(p-hydroxystyrene) having a well controlled t-BuO content is produced in high yields. 
Shin-Etsu Chemical Co., Ltd.
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inventional additional inventional inventional
Toshinobu Osamu Katsuya Junji Yoshihumi
Ishihara Watanabe Takemura Tsuchiya Takeda