Polycarbonate resins and processes for producing the same

摘要

The invention is to provide polycarbonate resins having excellent light resistance, transparency, hue, heat resistance, thermal stability, and mechanical strength and to provide processes for efficiently and stably producing a polycarbonate resin which stably shows those performances. The invention includes: polycarbonate resins which at least contain structural units derived from a dihydroxy compound having the portion represented by formula (1) as part of the structure thereof and which have specific properties; and processes for producing the polycarbonate resins,
CH2—O  (1)
where the case where the portion represented by formula (1) is part of —CH2—O—H is excluded.

主权项

1. A polycarbonate resin obtained by condensation-polymerizing at least one dihydroxy compound including a dihydroxy compound which has the portion represented by formula (1) as part of the structure thereof with a carbonic diester represented by formula (2) in the presence of a catalyst, the catalyst comprising one or more compounds containing at least one metal selected from the group consisting of lithium and the Group-2 metals of the long-form periodic table, the polycarbonate resin having a content of the metal-containing compounds of 20 μmol or less in terms of metal amount per mole of the dihydroxy compound and containing an aromatic monohydroxy compound in an amount of 700 weight ppm or less,
CH2—O  (1) wherein the case where the portion represented by formula (1) is part of —CH2—O—H is excluded, wherein, in formula (2), A1and A2 each independently are a substituted or unsubstituted aliphatic group having 1-18 carbon atoms or a substituted or unsubstituted aromatic group, and wherein the polycarbonate resin has a total content of sodium, potassium, and cesium of 1 weight ppm or less in terms of metal amount.