Novel crystal modifications of yellow diazo dyestuff and process for producing thereof

Crystal modifications of a known disazo pigment are obtained by treatment at ≥ 100 degrees C of the dye or a tautomer, cis/trans isomer or tautomeric cis/trans isomer with dimethylformamide, N-methyl-pyrrolidone, dimethyl sulfoxide, 4-20C alcohols, 1,2-dichlorobenzene, pyridine and/or nitrobenzene,...

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Hauptverfasser:	WACKER ANDREAS DR, METZ HANS-JOACHIM DR, SCHUPP OLAF DR, WEBER JOACHIM DR, JUNG RUEDIGER DR, SCHMIDT MARTIN U. DR
Format:	Patent
Sprache:	cze ; eng
Schlagworte:	ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY CINEMATOGRAPHY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COLOUR PRINTING CORRECTING FLUIDS CORRECTION OF TYPOGRAPHICAL ERRORS DYES ELECTROGRAPHY ELECTROPHOTOGRAPHY FILLING PASTES HOLOGRAPHY i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME INKS LAKES LINING MACHINES MAGNETOGRAPHY METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS MORDANTS NATURAL RESINS ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PERFORMING OPERATIONS PHOTOGRAPHY PHYSICS POLISHES PRINTING PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES SELECTIVE PRINTING MECHANISMS STAMPS TRANSPORTING TYPEWRITERS USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	Crystal modifications of a known disazo pigment are obtained by treatment at ≥ 100 degrees C of the dye or a tautomer, cis/trans isomer or tautomeric cis/trans isomer with dimethylformamide, N-methyl-pyrrolidone, dimethyl sulfoxide, 4-20C alcohols, 1,2-dichlorobenzene, pyridine and/or nitrobenzene, optionally in combination with up to 90 wt.% water. Crystal modifications of a known disazo pigment of formula (I) are obtained by treatment at ≥ 100 degrees C of (I) or a tautomer, cis/trans isomer or tautomeric cis/trans isomer with dimethylformamide, N-Me-pyrrolidone, dimethyl sulfoxide, 4-20C alcohols, 1,2-dichlorobenzene, pyridine and/or nitrobenzene optionally in combination with up to 90 wt.% water. Independent claims are also included for: (i) the yellow disazo pigment (I) whose Cu-K alpha X-ray powder diagram shows specified values for alpha , beta , gamma , delta , zeta and eta modifications; and (ii) mixtures of (I) containing ≥ 10 (especially ≥ 90) % of each of these individual modifications or of 2-6 of the modifications.