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:
Jan. 31, 2023
Filed:
Mar. 11, 2019
Teijin Limited, Osaka, JP;
Kyosuke Yamada, Osaka, JP;
Manabu Matsui, Osaka, JP;
Takatsune Yanagida, Osaka, JP;
Kazuyoshi Ogasawara, Osaka, JP;
Kazunori Nunome, Osaka, JP;
Keisuke Sato, Osaka, JP;
Tatsuya Oyama, Osaka, JP;
TEIJIN LIMITED, Osaka, JP;
Abstract
The purpose of the present invention is to provide a polyester resin or polyester carbonate resin, which has high refractive index, while achieving an excellent balance between heat resistance and low birefringence. A polyester resin or a polyester carbonate resin, which contains repeating units represented by the following formulae (1) and (2), and wherein the ratio of the repeating unit represented by formula (1) to the repeating unit represented by formula (2) is 15:85 to 85:15. (In formula (1), each of rings Zand Zrepresents a polycyclic aromatic hydrocarbon group having 9-20 carbon atoms; each of R, R, Rand Rindependently represents a hydrocarbon group which may contain an aromatic group having 1-12 carbon atoms; each of R-Rand R-Rrepresents a hydrogen atom or an aliphatic or aromatic substituents; each of j, k, r and s independently represent an integer of 0 or more; and each of m, n, p and q independently represents 1 or 2) (In formula (2), each of R, R, Rand Rindependently represent a hydrocarbon group which may contain an aromatic group having 1-12 carbon atoms; each of R-Rand R-Rrepresents a hydrogen atoms or an aliphatic or aromatic substituents; and each of r, s, t and u independently represents an integer of 0 or more.)