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. 05, 1987
Filed:
Nov. 25, 1985
Walter Horstmann, Bergisch-Gladbach, DE;
Bayer Aktiengesellschaft, Leverkusen, DE;
Abstract
New diaminoalkyldiphenyl ethers of the formula ##STR1## wherein R.sup.1 and R.sup.2 are identical or different and denote hydrogen or methyl, but R.sup.1 and R.sup.2 do not simultaneously represent methyl, are prepared by a process wherein alkyldiphenyl ethers of the formula ##STR2## wherein R.sup.1 and R.sup.2 have the above-mentioned meaning are acetylated, the diacetyl compounds obtained, in aqueous-alcoholic solution or suspension, are converted to the corresponding dioximes with hydroxylamine, the dried dioximes are subjected to a Beckmann rearrangement and thereafter the diacetylaminoalkyldiphenyl ethers formed are hydrolyzed by means of aqueous mineral acids or alkali metal hydroxide solutions to give the diamines. The new diaminoalkyldiphenyl ethers are used in the preparation of dyestuffs and polyurethanes and serve as monomers for the preparation of polymers.