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:
Sep. 24, 2013
Filed:
Aug. 06, 2009
Masayuki Nishio, Ube, JP;
Hiroaki Imajima, Ube, JP;
Takato Nakamura, Ube, JP;
Yoshihiro Yamauchi, Ube, JP;
Masayuki Nishio, Ube, JP;
Hiroaki Imajima, Ube, JP;
Takato Nakamura, Ube, JP;
Yoshihiro Yamauchi, Ube, JP;
Ube Industries, Ltd., Ube-shi, JP;
Abstract
Disclosed is a method for producing a biphenyltetracarboxylic acid ester by oxidative coupling a phthalic acid ester by using a catalyst comprising at least a palladium salt, a copper salt and a β-dicarbonyl compound in the presence of a molecular oxygen, wherein the β-dicarbonyl compound is supplied into a reaction mixture liquid intermittently at an interval of less than 30 minutes, or continuously. This method allows, in particular, the selective and economical production of an asymmetric biphenyltetracarboxylic acid tetraester such as 2,3,3',4′-biphenyltetracarboxylic acid tetraester.