| http://www.w3.org/ns/prov#value | - Generally speaking, the polycarbonates comprise repeating units of the formula ##STR4## wherein R3 is a divalent aromatic radical derived from a dihydroxyaromatic compound of the formula HO--R3 --OH. Typical dihydroxyaromatic compounds are 2,2-bis-(4-hydroxyphenyl)propane (bis-phenol A), hydroquinone, resorcinol, 2,2-bis-(4-hydroxyphenyl)pentane, 2,4'-dihydroxydiphenylmethane, bis-(2-hydroxyphenyl
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