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:
May. 02, 1989
Filed:
Mar. 10, 1988
Thomas M Ford, Greenville, DE (US);
Enio Kumpinsky, Wilmington, DE (US);
Antonio Vidal, Wilmington, DE (US);
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
A process for manufacturing 1,4-bis(4-phenoxybenzoyl)benzene, wehrein diphenyl ether is contacted for about 30-360 minutes at 130.degree.-200.degree. C. with 1,4-benzenedicarbonyl chloride in respective mole ratios of about 15-80:1 in the presence of a fluorocarbon resin carrying pendant sulfonic acid groups, the weight ratio of the resin to 1,4-benzenedicarbonyl chloride being 3:1-1:2; the hot solution is separated from the resin, and the crystalline product is recovered from the solution on cooling. The so obtained 1,4-bis(4-phenoxybenzoyl)-benzene is a high purity material free of ortho-isomer and catalyst contamination and can be used without further purification as one of the starting materials in the preparation of polyetherketones, which are important engineering resins.