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:
Oct. 12, 2021
Filed:
Jan. 09, 2020
Applicant:
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Inventors:
Assignee:
MITSUBISHI GAS CHEMICAL COMPANY, INC., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D 265/26 (2006.01); C07C 68/08 (2006.01); C08G 64/30 (2006.01); C07C 69/96 (2006.01); C08G 64/04 (2006.01); B01D 3/42 (2006.01); B01D 9/00 (2006.01); C07B 61/00 (2006.01);
U.S. Cl.
CPC ...
C07D 265/26 (2013.01); B01D 3/4211 (2013.01); B01D 9/0031 (2013.01); C07C 68/08 (2013.01); C07C 69/96 (2013.01); C08G 64/04 (2013.01); C08G 64/30 (2013.01); C07B 61/00 (2013.01);
Abstract
Disclosed are a diaryl carbonate containing a compound of the following formula (I) in an amount of less than 1,000 ppm by mass, and a method for producing the same: wherein Rrepresents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aryl group, or an aryloxy group. Disclosed methods include reacting urea with an alkyl alcohol to provide a dialkyl carbonate; reacting the dialkyl carbonate with an aryl alcohol to provide an alkylaryl carbonate; subjecting the alkylaryl carbonate to disproportionation to yield a mixture comprising a diaryl carbonate; and purifying the mixture.