POLYCARBONATE MIT NIEDRIGEM YELLOWNESS-INDEX

摘要

A process for the preparation of polycarbonate resins having a low yellowness index is described. The process involves converting phosgene with a sodium bisphenolate solution by means of a phase interface process performed with the exclusion of oxygen. The sodium bisphenolate solution used in the process has a dissolved oxygen content of 150 ppb. Also described are optical data storage media prepared from the polycarbonate of the present invention.