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. 09, 2010
Filed:
Mar. 28, 2008
Beatriz Penalver Bernabe, Chicago, IL (US);
Lioba Maria Kloppenburg, Mount Vernon, IN (US);
Matt Kuhlman, Evansville, IN (US);
Roy Ray Odle, Mount Vernon, IN (US);
Eric Pressman, Greenbush, NY (US);
Narayan Ramesh, Evansville, IN (US);
Harpreet Singh, Evansville, IN (US);
Beatriz Penalver Bernabe, Chicago, IL (US);
Lioba Maria Kloppenburg, Mount Vernon, IN (US);
Matt Kuhlman, Evansville, IN (US);
Roy Ray Odle, Mount Vernon, IN (US);
Eric Pressman, Greenbush, NY (US);
Narayan Ramesh, Evansville, IN (US);
Harpreet Singh, Evansville, IN (US);
Abstract
A method for preparing an oxydiphthalic anhydride comprises contacting, under reactive and substantially anhydrous conditions in a reactor, at least one halophthalic anhydride containing more than 250 ppm chlorophthalide impurity with a carbonate of the formula MCO, wherein M is an alkali metal, in the presence of a catalytic proportion of at least one phase transfer catalyst selected from the group consisting of hexaalkylguanidinium halides and alpha,omega-bis(pentaalkylguanidinium)alkane salts, phosphonium salts, phosphazenium salts, pyridinium salts, phosphazenium salts, ammonium salts, and combinations thereof. The phase transfer catalyst is present in a sufficient amount to prepare the oxydiphthalic anhydride when the chlorophthalide is present in an amount that is more than 250 ppm, and the oxydiphthalic anhydride is produced in a yield, based on the carbonate, of at least 70%.