초록 ▼

The manufacture of polycarbonates can be accomplished via an ester interchange reaction of a dihydroxy compound and a carbonic acid diester. The method, which can be a single or multi-stage process wherein the total amount of alkali metal compounds and alkaline earth metal compounds contained as imp

The manufacture of polycarbonates can be accomplished via an ester interchange reaction of a dihydroxy compound and a carbonic acid diester. The method, which can be a single or multi-stage process wherein the total amount of alkali metal compounds and alkaline earth metal compounds contained as impurities is 1.times.10-7 moles or less per mole of dihydroxy compound used as raw materials, and the catalyst employed is an ammonium and/or phosphonium compound, a compound which decomposes or volatilizes at a temperature of 100 to 300.degree. C., and/or an alkali metal phosphorous containing inorganic salt and/or alkaline earth metal phosphorous-containing inorganic salt.

대표청구항 ▼

1. A method for manufacturing a polycarbonate comprising using an ester interchange reaction of raw materials comprising a dihydroxy compound and a carbonic acid diester:wherein prior to the interchange reaction the dihydroxy compound and the carbonate diester used contain no greater than a total 1.

1. A method for manufacturing a polycarbonate comprising using an ester interchange reaction of raw materials comprising a dihydroxy compound and a carbonic acid diester:wherein prior to the interchange reaction the dihydroxy compound and the carbonate diester used contain no greater than a total 1.times.10-7 mole of alkali metal compounds of alkaline earth metal compounds as impurities per 1 mole of the dihydroxy compound and during the interchange reaction an alkali metal phosphite inorganic salt is used as a catalyst.