Patent ID: 6284889
Filing Date: 2001-09-04
Classification: C09B,G02F

Abstract:
A chromophoric compound of the general formula 1 ##STR7##whereR.sup.1, R.sup.4, R.sup.5 are each a hydrogen atom, a linear or branched C.sub.1 - to C.sub.20 -alkyl radical which is optionally interrupted by 1 to 5 ether oxygen atoms, or an aryl or heteroaryl radical;R.sup.2, R.sup.3, which can be the same or different, are each a hydrogen atom, a linear or branched C.sub.1 - to C.sub.20 -alkyl radical which is optionally interrupted by 1 to 5 ether oxygen atoms, a benzyl radical or an aryl or heteroaryl radical, where one of the radicals R.sup.2 and R.sup.3 optionally has a hydroxyl or carboxyl group; provided that R.sup.1 and R.sup.2 or R.sup.2 and R.sup.3 or R.sup.3 and R.sup.4 taken together jointly form a 5-membered or 6-membered ring;Z is a methylene or imino group bearing an electron-acceptor cyano and/or alkoxycarbonyl substituent;X denotes ##STR8##where T denotes CH or N; andY is a CH or CR.sup.7 group or N where R.sup.7 is a linear or branched C.sub.1 - to C.sub.20 -alkyl radical or a phenyl or a naphthyl radical.