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:
Dec. 29, 1992
Filed:
May. 14, 1990
Applicant:
Inventors:
Eduard P Babayan, Huntington Beach, CA (US);
Douglas G Soden, Santa Ana, CA (US);
Anthony Bosch, El Toro, CA (US);
Assignee:
The Standard Oil Company, Cleveland, OH (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
560 52 ; 560 64 ; 560 59 ; 560 76 ; 560 96 ;
Abstract
A process for producing a dialkyl ester (i.e. BTDE) from its corresponding dianhydride (i.e., BTDA) comprising mixing the dianhydride, an organic solvent, solid catalyst and an alcohol capable of reacting with the dianhydride stirring the solution until the dianhydride and alcohol have reacted to form the dialkyl ester, separating the dialkyl ester from the catalyst and drying the ester to form a solid paticulate product. The product has a purity of over 85%.