Transesterification of diphenylcarbonate

The most practical nonphosgene process for manufacturing polycarbonates is the transesterification of diphenylcarbonate (DPC) with bisphenol-A. A nonphosgene process for the melt polymerization production of aromatic polycarbonates [reaction (14)], making use of EniChem technologies for the production of DMC and DPC as intermediates, has been commercially established and will account in a short time for about 300,000 ton/yr polycarbonates. 

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