Green decorative colour for high temperature firing, process for its preparation and its use

• Main Authors: SPEER, DIETRICH, JACKOW, KATIA, SPERLICH, JOERG, LUDWIG, STEPHAN, DORER, KAI
• Format: Patent
• Language: English; French; German
• Published: 07.04.1999
• Edition: 6
• Subjects: ADHESIVES; ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; DYES; GLASS; JOINING GLASS TO GLASS OR OTHER MATERIALS; LIME, MAGNESIA; METALLURGY; MINERAL OR SLAG WOOL; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; POLISHES; PREPARATION OF CARBON BLACK; REFRACTORIES; SLAG; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS; TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES; TREATMENT OF NATURAL STONE

Die Erfindung stellt erstmalig rein grüne Dekorfarben für den Hochtemperaturbrand bei mindestens 1000 °C, insbesondere 1100 bis 1250 °C, mit einem Bunttonwinkel h im Bereich von 160° ± 20° zur Verfügung. Die Dekorfarbe enthält Chromoxid als Pigment und eine oder mehrere Glasfritten als Glasfluß und zusätzlich eine Kobaltverbindung aus der Reihe CoO, Co(OH)2 und unterhalb oder bei der Brenntemperatur CoO bildenden Co-Verbindungen, wobei das Atomverhältnis Co zu Cr im Bereich von 0,01 bis 0,35, vorzugsweise 0,15 bis 0,25 liegt. The invention makes available for the first time pure green decoration coloring substances for high-temperature firing at least at 1000 DEG C., in particular at 1100 to 1250 DEG C., with a color hue angle h in the range of 160 DEG +/-20 DEG . The decoration coloring substance comprises chromium oxide as the pigment and one or several glass frits as glass flux, and additionally a cobalt compound from the series CoO, Co(OH)2 and Co compounds forming CoO below or at the firing temperature, with the atomic ratio of Co to Cr being in the range of 0.01 to 0.35, preferably 0.15 to 0.25.