Patent ID: 7528214

Claim:
A method for producing a transparent article, the method comprising the steps of: melt transesterifying a monomer mixture in the presence of a transesterification catalyst, said monomer mixture comprising a hydroquinone, at least one aromatic dihydroxy compound other than the hydroquinone, and a carbonic acid diester to produce a hydroquinone polycarbonate copolymer product comprising greater than 45 mole percent of structural units derived from the hydroquinone, wherein the transesterification catalyst is in an amount of 1×10 −7 to 1×10 −2 moles catalyst per total moles of the hydroquinone and the at least one aromatic dihydroxy compound, and wherein the carbonic acid diester is in an amount of 0.95 to 1.08 moles per mole of the hydroquinone and the at least one aromatic dihydroxy compound; heating the hydroquinone polycarbonate copolymer product to a processing temperature of 5° C. to 20° C. above a maximum melting melt temperature for the hydroquinone polycarbonate copolymer product for a period of time effective to render the hydroquinone polycarbonate copolymer product transparent upon cooling to an ambient temperature; and cooling the hydroquinone polycarbonate copolymer product to the ambient temperature to produce the transparent article.