Sulfuric Acid → HCID 19083679, compound

Participants

Reaction Steps

A solution was prepared by dissolving 100 parts by weight, as the total amount, of p-t-butoxystyrene and styrene (molar ratio was p-t-butoxystyrene:styrene=80:20) in 150 parts by weight of propylene glycol monomethyl ether. This solution was kept under a nitrogen atmosphere at 70° C. for 10 hr with 4 parts by weight of azobisisobutyronitrile supplied to proceed polymerization. Then, sulfuric acid was added to the reaction solution, and the resultant solution was kept at 90° C. for 10 hr to covert the p-t-butoxystyrene unit into a hydroxystyrene unit through deprotection. Ethyl acetate was added to the obtained copolymer, the resultant solution was washed with water 5 times, the ethyl acetate phase was collected, and the solvent was removed to obtain p-hydroxystyrene/styrene copolymer (hereinafter, referred as “alkali soluble resin (A-1)”).

Provenance & Evidence