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:
Sep. 26, 1995
Filed:
Feb. 24, 1994
Ted A Morgan, Midland, MI (US);
Bassam S Nader, Midland, MI (US);
Paul Vosejpka, Midland, MI (US);
Weshi Wu, Midland, MI (US);
Andrew S Kende, Pittsford, NY (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
The present invention is a method of preparing a 4,6-bisarylazoresorcinol comprising reacting an aryldiazonium salt and resorcinol in the presence of a base and a reaction medium containing water and a water-miscible solvent at a temperature in the range of about -5.degree. C to about -60.degree. C. The present invention is also a method of preparing a 2-substituted 4,6-bisarylazoresorcinol comprising reacting an aryldiazonium salt with a 2-substituted resorcinol. The 4,6-bisarylazoresorcinol or 2-substituted 4,6-bisarylazoresorcinol can then be hydrogenated to a 4,6-diaminoresorcinol, which is a precursor to polybisbenzoxazoles (PBOs), polymers which are useful as insulators, solar arrays, and tear-resistant gloves.