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. 23, 1999
Filed:
Oct. 11, 1996
Heinz Langhals, Ottobrunn, DE;
Petra Christa von Unold, Munchen, DE;
Abstract
Naphthalenelactamimides of the formula I ##STR1## in which, for example, R.sub.1 and R.sub.2 are 2,5-di-tert-butylphenyl and m and n are 0, are novel dyes which have the distinctive features of pronounced fluorescence as a solid and in solvents and a good light-fastness. They are therefore suitable, for example, for mass dyeing of high molecular weight organic material, as laser dyes and for the preparation of printing toners, colour filters, organic photoreceptors, electroluminescent and photoluminescent elements, optical information storage media or solar collectors. The compounds of the the formula I can be prepared by reaction of the corresponding naphthalenetetracarboxylic acid bisimides with a base.