Dibutyl Phthalate → Phthalic Anhydride

Participants

Reaction Steps

320 parts of a 40% xylene solution of dihydroxyethylenepropylene copolymer (molecular weight; 8,000, propylene content; 50%, prepared by hydroxyethylating both terminals of the ethylene-propylene copolymer as produced by known living anionic polymerization with ethyleneoxide) and 460 parts of a 40% dibutyl phthalate solution of polyester obtained from 1,4-butanediol and phthalic anhydride (equivalent weight ratio; 41/40, molecular weight; 8,000) were fed into a four-mouthed reaction vessel fitted with a powerful stirrer, a temperature sensor, a condenser and a material charging inlet and stirred for one hour at 100° C. for homogenization. Afterwards, 4.3 parts of hexamethylene diisocyanate was added thereto and stirred for one hour at 120° C., and 0.02 part of dibutyl tin dilaurate was further added thereto and reacted until the NCO content became 0.05 or less (generally, for five hours) to obtain a 40% solvent solution of component (2)(i).

Provenance & Evidence