OFFSET INK COMPOSITION

PROBLEM TO BE SOLVED: To provide a permeation drying type printing ink reproducing a wider color reproduction region than color reproduction region of RGB expressed by conventional four process colors of yellow, red, indigo, black. SOLUTION: The invention relates to the offset printing ink comprisin...

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Bibliographische Detailangaben
Hauptverfasser:	YABUNO MICHIO, WASHIO TOMOHITO, SHIRAISHI HIDENORI, ASAI HIROSHIGE
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COLOUR PRINTING CORRECTING FLUIDS DYES FILLING PASTES INKS LINING MACHINES METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PERFORMING OPERATIONS POLISHES PRINTING PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES STAMPS TRANSPORTING TYPEWRITERS USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a permeation drying type printing ink reproducing a wider color reproduction region than color reproduction region of RGB expressed by conventional four process colors of yellow, red, indigo, black. SOLUTION: The invention relates to the offset printing ink comprising following pigment combinations. A yellow ink comprising 5-15% of C.I. pigment yellow 12 or C.I pigment yellow 13 as disazo yellow compound, and having opacity exceeding 31 of L* value in overprinting with a density of 0.85-0.91 on a black ink with a density of 1.10-1.20. A red ink comprising 15-20% of C.I. pigment red 81 or C.I pigment violet 1 as a metal chelate compound of a rhodamine based dye. An indigo ink comprising 10-25% of C.I.pigment blue 15:3 or C.I.pigment blue 15:4 and/or 0.5-2.0% of C.I. pigment green 7 as a phthalocyanine based compound. COPYRIGHT: (C)2007,JPO&INPIT