Loading patent…
AssigneeMitsubishi Chemical Corporation
InventorsKei Uchiyama, Kazuhisa Hatakeyama, Makoto Nakamura, Toshio Uchibori, Michitaka Ise
Estimating the term…
Provided is a thermally stable bisphenol composition whose increase in the Hazen color number is suppressed even under higher temperature conditions. A bisphenol composition including an aryl alkyl sulfide or a dialkyl disulfide at 0.1 ppb by mass to 1% by mass with respect to a bisphenol. A bisphenol composition including an aryl alkyl sulfide or a dialkyl disulfide at a predetermined ratio is thermally stable in terms of the Hazen color number, and shows no coloring problem under high temperature conditions. By using such a bisphenol composition, a polycarbonate resin having an excellent color tone can be produced.
A bisphenol composition comprising an aryl alkyl sulfide at 1 ppb by mass to 1% by mass with respect to a bisphenol, wherein the content of the bisphenol is not less than 95.0% by mass.
A bisphenol composition comprising a dialkyl disulfide at 1 ppb by mass to 1% by mass with respect to a bisphenol, wherein the content of the bisphenol is not less than 95.0% by mass.
A polycarbonate resin comprising aryl alkyl sulfide structural units at not less than 1 ppb by glass with respect to bisphenol structural units.
Dependencies are inferred from the claim text.