POLYCARBONATE-POLYORGANOSILOXANE COPOLYMER PRODUCTION METHOD

摘要

Provided is a polycarbonate-polyorganosiloxane copolymer production method wherein a reaction system for polymerizing aromatic dihydric phenol and carbonate precursors is added with a polyorganosiloxane to conduct copolymerization, comprising: collecting a portion of the polycarbonate-polyorganosiloxane copolymer obtained after the copolymerization; measuring, by near-IR spectrometry, the polyorganosiloxane content ratio within the copolymer; and controlling the amount of polyorganosiloxane to be added to the reaction system on the basis of the measured value.