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:
Feb. 14, 2023
Filed:
Mar. 20, 2019
Teijin Limited, Osaka, JP;
Tatsuya Oyama, Osaka, JP;
Kazuyoshi Ogasawara, Osaka, JP;
Atsushi Umeki, Osaka, JP;
Keisuke Sato, Osaka, JP;
Manabu Matsui, Osaka, JP;
TEIJIN LIMITED, Osaka, JP;
Abstract
The purpose of the present invention is to provide a high temperature/humidity resistant polycarbonate resin without using bisphenol A as a raw material. The present invention relates to a polycarbonate resin comprising the repeating units of formulas (1), (2) and (3), wherein the content of the repeating unit of formula (3) is 5 mol% to 50 mol%, and the refractive index is 1.570 to 1.600. {In formula (1), Rand Reach represent a hydrogen atom or a Chydrocarbon group.} {In formula (3), n ranges from 0 to 8, and the R symbols are each selected from Calkyl groups}.