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AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsYoshinori Isahaya, Atsushi Hirashima, Hidefumi Harada, Maki Ito, Jun-ya Hayakawa, Takehiko Isobe, Taichi Tokutake, Yousuke Shinkai
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A branched aromatic polycarbonate resin having a degree of branching (N value) controlled within a specific range is manufactured by subjecting an aromatic polycarbonate prepolymer that has a branched structure introduced using a specific amount of a branching agent to molecular-weight-increasing linking reaction with an aliphatic diol compound in the presence of a transesterification catalyst under the condition of a reduced pressure. The amount (A) of the branching agent used is adjusted on the basis of the correlation between the amount (A) of the branching agent used and the N value of the branched aromatic polycarbonate resin.
A process for manufacturing a branched aromatic polycarbonate resin having a desired degree of branching which comprises a process wherein an aromatic polycarbonate prepolymer having a branched structure introduced by using a predetermined amount of a branching agent is subjected to linking and a highly-polymerizing reaction by melt polymerization under reduced pressure with an aliphatic diol compound having aliphatic hydrocarbon groups bonding to terminal OH groups.
Dependencies are inferred from the claim text.