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. 30, 1993
Filed:
Nov. 15, 1991
Vincent F Smith, Jr, Big Rock, IL (US);
Gary J Gudac, Joliet, IL (US);
Amoco Corporation, Chicago, IL (US);
Abstract
The invention relates to the preparation of novel dianhydrides of the formula: ##STR1## wherein R is a polyalkylated mononuclear aromatic radical, preferably a phenylene radical. The mononuclear aromatic radical may be substituted with from three to four lower alkyl radicals, preferably C.sub.1 -C.sub.4 alkyl radicals. The dianhydrides are preferably made by the reaction of a monoanhydride monoacid halide and a polyalkylated mononuclear aromatic in the presence of a Friedel-Crafts catalyst under Friedel-Crafts reaction conditions. These dianhydrides ae useful reactants in the preparation of polyimides and epoxy curing agents.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile