A METHOD FOR PREPARING A POLYCARBONATE RESIN HAVING A LOW COEFFICIENT OF THERMAL EXPANSION

摘要

A polycarbonate resin of a semi-interpenetrating polymer network system is provided to secure excellent light transparence and low thermal expansion coefficient and to prepare a plastic substrate or a display optical film with excellent performance. A polycarbonate resin of a semi-interpenetrating polymer network system comprises the steps of: preparing a raw material mixture containing polycarbonate, a bisphenol-based compound having epoxy end groups and amine curing agent; and reacting the raw material mixture. The weight average molecular weight of polycarbonate is 400-50,000. The main chain of the polycarbonate comprises at least one repeating units represented by formula 1 or 2.