| 摘要 |
A process for the preparation of a phenol and solvent free polycarbonate resin is disclosed comprising (i) forming an oligomeric polycarbonate comprising structural units based on a diphenol corresponding to <IMAGE> wherein R1 and R2 independently of one another denote a member selected from the group consisting of a hydrogen atom, a halogen atom, C1-8 alkyl, C5-6 cycloalkyl, C6-10 aryl and C7-12 aralkyl radicals, m is an integer of from 4 to 7, X represents carbon and R3 and R4 are individually selected for each X and independently of one another represent a hydrogen atom or a C1-6 alkyl radical, with the proviso that for at least one X atom, both R3 and R4 are alkyl radicals, and (ii) condensing said oligomeric polycarbonate at a temperature in the range of of 140 to 350 DEG C.
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