| 摘要 |
A process for producing a polycarbonate including melt polycondensing an aromatic dihydroxy compound and a carbonic acid diester in the presence of a phosphonium borohydride catalyst(I), <IMAGE> (I) wherein R is a straight-chain or branched alkyl group, or <IMAGE> wherein each of R1, R2, and R3, independently is a C1 DIFFERENCE C4 alkyl group. A colorless, transparent polycarbonate having a high molecular weight is obtained by using the phosphonium borohydride compound (I) as a transesterification catalyst, which may be used alone or incorporated with boric acid or a hindered phenol antioxidant.
|
