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. 02, 1980
Filed:
Nov. 13, 1978
Rudiger Erckel, Eppstein, DE;
Erwin Schmidt, Kelkheim, DE;
Helmut Eckes, Frankfurt am Main, DE;
Gu Rosch, Bad Soden am Taunus, DE;
Hoechst Aktiengesellschaft, , DE;
Abstract
Diamino-1,3-5-triazinylstilbene compounds of the formula ##STR1## in which R.sub.1 and R.sub.2 may be identical or different and represent each hydrogen or non chromophoric radicals selected from the group consisting of fluorine or chlorine atoms, phenyl, alkyl, lower alkoxy, lower dialkylamino, lower trialkylammonium, acyl amino or optionally functionally modified carboxy or sulfo groups, or two vicinal radicals, R.sub.1 and R.sub.2 denote together lower alkylene, a fused benzo ring or 1,3-dioxypropylene, the rings A and B having optionally further non chromophoric substituents, and X is O or S. These compounds are good optical brighteners and are prepared by reacting a 4'-cyano-4-benzoxazolyl- or 4'-cyano-4-benzthiazolylstilbene compound with dicyanoamide or with urea and ammonia.