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:
Nov. 03, 2015
Filed:
Jan. 20, 2011
Applicants:
Shuji Tanaka, Ube, JP;
Hirofumi Ii, Ube, JP;
Inventors:
Shuji Tanaka, Ube, JP;
Hirofumi Ii, Ube, JP;
Assignee:
UBE INDUSTRIES, LTD., Ube-shi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C 67/02 (2006.01); C07C 67/03 (2006.01); C07C 68/00 (2006.01); C08G 64/30 (2006.01);
U.S. Cl.
CPC ...
C07C 67/03 (2013.01); C07C 68/00 (2013.01); C08G 64/307 (2013.01);
Abstract
Disclosed is a process for preparing a diaryl oxalate which comprises the step of transesterifying a dialkyl oxalate or/and an alkylaryl oxalate with an aryl alcohol in the presence of a tetra(aryloxy)titanium as a catalyst, wherein the tetra(aryloxy)titanium is fed into a reaction system of the transesterification as an aryl alcohol solution of the tetra(aryloxy)titanium which is prepared by reacting a tetraalkoxy titanium and an excess amount of the aryl alcohol and removing a by-producing alkyl alcohol.