| http://www.w3.org/ns/prov#value | - In the melt process for preparation of polycarbonate, aromatic diesters of carbonic acid are condensed with an aromatic dihydroxy compound in a transesterification reaction in the presence of a basic catalyst such as sodium methylate, sodium bisphenolate, calcium acetate, phenyl benzoate, N-stearoylphenothiazine, quaternary ammonium chloride, an alkaline(hydroxy)fluoroborate, an alkali metal salt
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