Styryl-like compounds showing a color-developing and bleaching behavior with improved stability and prolonged lifetime

• Main Authors: YAMASHITA; AKIO, HAYAMI; MASAAKI
• Format: Patent
• Language: English
• Published: 19.04.1983
• Subjects: ADHESIVES; AUXILIARY PROCESSES IN PHOTOGRAPHY; CHEMISTRY; CINEMATOGRAPHY; COLOUR PRINTING; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; DYES; ELECTROGRAPHY; FREQUENCY-CHANGING; HETEROCYCLIC COMPOUNDS; HOLOGRAPHY; LAKES; LINING MACHINES; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; MORDANTS; NATURAL RESINS; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; ORGANIC CHEMISTRY; ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES; PAINTS; PERFORMING OPERATIONS; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR,STEREO-PHOTOGRAPHIC PROCESSES; PHOTOGRAPHY; PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHYSICS; POLISHES; PRINTING; PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; STAMPS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TRANSPORTING; TYPEWRITERS

Styryl-like compounds showing improved stability and prolonged lifetime on repetition of the coloration and bleaching cycle and represented by the general formula in which R represents an alkyl or phenyl group, R1 and R2 independently represent a lower alkyl group, a hydroxyalkyl group, or an alkoxyalkyl group, R3 represents hydrogen, an alkyl group, a halogen, a nitrile group, an aromatic group or a phenoxy group, Y represents O or S, Z represents an alkylene radical of 2 to 4 carbon atoms, with or without alkyl substituent(s), necessary for forming a ring structure together with A represents a residue of an aromatic aldehyde, a heterocyclic aldehyde, an aromatic nitroso compound or a heterocyclic nitroso compound, and n is an integer of 2 or 3.