| 摘要 |
PROBLEM TO BE SOLVED: To provide a polycarbonate-polyorganosiloxane copolymer which is excellent in transparency and is reduced in yellowishness without deterioration of mechanical characteristics.SOLUTION: In a differential molecular weight distribution curve with the lateral axis being the logarithmic value log(M) of the molecular weight M and the vertical axis being dw/dlog(M), or the concentration fraction w differentiated with the logarithmic value log(M), obtained by gel permeation chromatography based on polystyrene, for polyorganosiloxane, the value obtained by integration of dw/dlog(M) in the range of 2.5≤log(M)≤3.1 is 0-10% of the value obtained by integration of dw/dlog(M) in the whole range of log(M). |
