Patent ID: 7495064

Claim:
A method of producing a polycarbonate comprising the steps of, (i) introducing to a melt polymerization reactor system comprising a polymerization reactor operating under melt polymerization conditions, a reaction mixture comprising: an acid stabilizer and a first dihydroxy compound selected from the group consisting of catechol, resorcinol, hydroquinone, butyl hydroquinone, methyl hydroquinone, DMBPC, biphenol, o,o-biphenol, 2,2-dihydroxynaphtalene, and ortho-methyl BPA, an activated diarylcarbonate, and a polymerization catalyst system comprising a first catalyst compound having the structure: M p H q Q wherein Q is phosphate, sulfate, phosphite, sulfite, thiosulfate, or thiophosphate; H is hydrogen; M is an alkali metal, an alkali earth metal, or (NH 4 ); and p and q are independently 1 or 2, and wherein the first catalyst compound is present in an amount sufficient to catalyze a polymerization reaction between the free hydroxyl ends of the first dihydroxy compound and the activated diarylcarbonate, and (ii) allowing the reaction mixture to polymerize thereby forming polycarbonate.