Sulfuric Acid → Styrene p-hydroxystyrene

Participants

Reaction Steps

70 parts by mass of p-t-butoxystyrene and 10 parts by mass of styrene were dissolved in 150 parts by mass of propylene glycol monomethyl ether. The mixture was polymerized at 70° C. for 10 hours in a nitrogen atmosphere in the presence of 4 parts by mass of azobisisobutyronitrile. After the addition of sulfuric acid to the reaction solution, the components were reacted at 90° C. for 10 hours to convert (deprotect) p-t-butoxystyrene to p-hydroxystyrene. After the addition of ethyl acetate to the resulting copolymer, the mixture was washed five times with water. After isolating the ethyl acetate phase, the solvent was removed to obtain a p-hydroxystyrene/styrene copolymer (hereinafter referred to as “resin (AR-1)”). The resin (AR-1) was analyzed in the same manner as in Production Example 1. The resin (AR-1) had a content of the structural unit (a2) derived from p-hydroxystyrene of 80 mol % and a content of the structural unit (a3-1) derived from styrene of 20 mol %. The resin (AR-1) had a polystyrene-reduced weight average molecular weight of 32,000.

Provenance & Evidence