Method for preparing partially tert-butoxylated poly(p-hydroxyst

Details Method for preparing partially tert-butoxylated poly(p-hydroxyst Method for preparing partially tert-butoxylated poly(p-hydroxyst

1995-09-29

1996-12-03

Lipman, Bernard

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

5253289, 525344, 525353, 525355, 525386, C08F 800

Patent

active

055809367

ABSTRACT:
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.

REFERENCES:
patent: 5110709 (1992-05-01), Aoai et al.
patent: 5346803 (1994-09-01), Crivello et al.

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