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 the following general formula (1) as part of the structure thereof and which have specific properties; and processes for producing the polycarbonate resins.
[Chem. 1]CH2—O  (1)
(The case where the portion represented by general formula (1) is part of —CH2—O—H is excluded.)

主权项

1. A polycarbonate resin comprising:
structural units derived from a dihydroxy compound having a portion represented by formula (1) as part of the structure thereof:
CH2—O  (1)wherein the portion represented by formula (1) is not part of —CH2—O—H is; and
an aromatic monohydroxy compound in an positive amount of 700 weight ppm or less; wherein the polycarbonate resin is obtained using at least one metal compound selected from the group consisting of a magnesium compound and a calcium compound as a catalyst, and the polycarbonate resin has a total positive content of lithium, sodium, potassium, and cesium of 1 weight ppm or less in terms of metal amount, and wherein a molded object, having a thickness of 3 mm, obtained from said polycarbonate resin has a light transmittance, as measured at a wavelength of 350 nm, of 65% or higher.