| 摘要 |
The prodn. of aromatic polycarbonates (PC) with UV-absorber end-gps. and a mean M2 of 1500-150,000, opt. mixed with known aromatic PC with a similar range of M2, from diphenols, 0.001-1 mole chain cleavage agent (to 1 mole diphenol), a source of carbonic acid and opt. a chain branching agent. The process is carried out by a known interfacial, soln. or melt-transesterification method, using a cpd. of formula (I) as chain-cleavage agent (opt. with other known cpds.); R<1> = H, 1-18C alkyl, 3-6C cycloalkyl or 6-10C aryl; R<2> = H, Cl or 1-12C alkyl; X = single bond, 1-12C alkylene, 5-6C cycloalkylene or 6-10C arylene; Y = a gp. which is reactive under the reaction conditions. Also claimed are aromatic PC with end gps. obtd. by removing the gp. (Y) from formula (I). |
