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. 18, 1990
Filed:
Nov. 23, 1988
Jurgen Lau, Hofheim am Taunus, DE;
Gunter Siegemund, Hofheim am Taunus, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
Compounds of the formula ##STR1## in which A represents the radicals ##STR2## in which R.sup.1 and R.sup.2 are different from one another and denote hydrogen, --NO.sub.2 or --NH.sub.2, R.sup.3 is hydrogen or halogen, X represents --NO.sub.2 or --NH.sub.2, with the proviso that R.sup.1 is hydrogen, if R.sup.2 is --NO.sub.2 or --NH.sub.2 and R.sup.2 is hydrogen, if R.sup.1 is --NO.sub.2 or --NH.sub.2. The compounds are prepared from 4,4'-bis[2-(4-hydroxyphenyl)hexafluoroisopropyl]diphenyl ether by nitration or reaction with nitrobenzenes followed by reduction of the nitro groups. They are used for the preparation of high-temperature-resistant polycondensates.