| 摘要 |
<p>This invention is directed to improved polycarbonates comprising from about 20 weight percent to about 95 weight percent of repeating units (I) having the formula (I) and from about 5 weight percent to about 80 weight percent of repeating units (II) having the formula (II) in which the repeating units (I) and the repeating units (II) are connected by interbonding units (III) having the formula (III) wherein Y is selected from alkyl groups of 1 to 4 carbon atoms, chlorine or bromine, each z, independently, has a value of from 0 to 4 inclusive, n has a value of 0 or 1, and R1 is a divalent saturated or unsaturated aliphatic hydrocarbon radical, O, CO, SO2, S or a direct bond, with the proviso that when R1 is SO2 then repeating unit (II) is not the same as repeating unit (I) and wherein terminal units in the polycarbonate are bonded to repeating units (II). The invention is also directed to a process for preparing the improved polycarbonates.</p> |
