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:
Mar. 31, 2015
Filed:
Apr. 12, 2007
Masakazu Nishiyama, Shunan, JP;
Naoki Matsumoto, Shunan, JP;
Takanori Miyazaki, Shunan, JP;
Takeshi Kanbara, Shunan, JP;
Masakazu Nishiyama, Shunan, JP;
Naoki Matsumoto, Shunan, JP;
Takanori Miyazaki, Shunan, JP;
Takeshi Kanbara, Shunan, JP;
Tosoh Corporation, Shunan-shi, JP;
Abstract
A novel material having high hole-transporting ability and a high glass transition temperature and having long-lasting durability is obtained. A benzofluorene compound represented by formula (1) is used. (In the formula, M is a substituted or unsubstituted aryl group having 6-40 carbon atoms or a substituted or unsubstituted heteroaryl group having 5-40 carbon atoms; Arto Areach independently is a substituted or unsubstituted aryl group having 6-40 carbon atoms or a substituted or unsubstituted heteroaryl group having 5-40 carbon atoms, provided that at least one of Arto Aris a substituent represented by any of the following formulae (2) to (5); and p is an integer of 0-2.) (In the formulae, Rto Reach independently is a hydrogen atom, a halogen atom, a substituted or unsubstituted amino group, a linear, branched, or cyclic alkyl group, a linear, branched, or cyclic alkoxy group, a substituted or unsubstituted aryl group having 6-40 carbon atoms, or a substituted or unsubstituted aryloxy group having 6-40 carbon atoms, provided that Rand Rmay be bonded to each other to form a ring.)