The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 25, 2023
Filed:
Feb. 21, 2020
Mitsubishi Chemical Corporation, Chiyoda-ku, JP;
Kei Uchiyama, Chiyoda-ku, JP;
Kazuhisa Hatakeyama, Chiyoda-ku, JP;
Makoto Nakamura, Chiyoda-ku, JP;
Toshio Uchibori, Chiyoda-ku, JP;
Michitaka Ise, Chiyoda-ku, JP;
MITSUBISHI CHEMICAL CORPORATION, Chiyoda-ku, JP;
Abstract
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.