| 摘要 |
PURPOSE:To obtain the titled resin excellent in flow and useful for optical moldings, by producing the resin from a dihydric phenol compound by using a specified monofunctional organic compound and a polyfunctional organic compound as a chain terminator and a branching agent, respectively. CONSTITUTION:A polycarbonate resin is produced from a dihydric phenol by using a monofunctional organic compound of formula I or II as a chain terminator and using an at least trifunctional organic compound having phenolic hydroxyl groups as a branching agent. In the formulae, X is -COCl or -COOH, Y is a direct bond or -COO- and n is 8-30. It is suitable that the viscosity-average MW of the branched end-modified polycarbonate resin is set such that its Q value may be 20X10<-2>cc/sec or below. For this purpose, it is suitable that its viscosity-average MW is 13,000-23,000, preferably 16,000-20,000.
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