Process for production of stabilized polycarbonate

A process for the production of a stabilized polycarbonate which comprises melt-polycondensing an aromatic dihydroxy compound and a carbonic acid diester in the presence of a polycondensation catalyst and then, after the reaction mixture shows an intrinsic viscosity of at least 0.1, adding at least one stabilizer selected from the group consisting of

• a compound of the formula (II)
• .sup.+ X.sup.2 --A.sup.2 --Y.sup.1 --SO.sub.3.sup.- (II)
• wherein A.sup.2 is a divalent hydrocarbon group,
• .sup.+ X.sup.2 is a secondary, tertiary or quaternary ammonium cation or a secondary, tertiary or quaternary phosphonium cation, and
• Y.sup.1 is a single bond or an oxygen atom,
• and a compound of the formula (III)
• A.sup.3 --(.sup.+ X.sup.3).sub.n.(R--Y.sup.1 --SO.sub.3.sup.31).sub.n(III)
• wherein A.sup.3 is a hydrocarbon group having a valence of n,
• .sup.+ X.sup.3 is a secondary, tertiary or quaternary ammonium cation or a secondary, tertiary or quaternary phosphonium cation,
• R is a monovalent hydrocarbon group,
• n is an integer of 2 to 4, and
• Y.sup.1 is a single bond or an oxygen atom,
• in an amount of 0.01 to 500 ppm of a polycarbonate to be formed, to form a polycarbonate having a desired intrinsic viscosity.