METHOD FOR MAKING HIGH TINT STRENGTH PIGMENT COMPOSITIONS

• Main Authors: ASHLEY, MICHAEL, L, PILLARS, DARCI, HAGER, GREGORY, TODD
• Format: Patent
• Language: English; French
• Published: 05.07.2007
• Subjects: ADHESIVES; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; DYES; INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OFSOLID INORGANIC COMPOUNDS; INORGANIC CHEMISTRY; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; POLISHES; PREPARATION OF CARBON BLACK; THEIR PREPARATION OR CHEMICAL WORKING-UP; TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

The invention concerns a method for making a pigment composition comprising inorganic base particles and one or more inorganic spacer particles precipitated thereon, including the steps of forming an aqueous slurry of the inorganic base particles, if necessary, milling the aqueous slurry so that at least 50% of the inorganic base particles are less than 0.5 microns, in size, heating the slurry as needed to achieve and maintain a temperature of at least 40 degrees Celsius, adjusting the pH of the slurry as needed to achieve and maintain a pH in the range of from 4 to 9, adding the inorganic spacer particles to the slurry while maintaining such temperature and pH conditions and with intensive mixing, and finally, recovering the pigment composition from the slurry. L'invention concerne un procédé de fabrication d'une composition de pigment comprenant des particules inorganiques de base sur lesquelles sont précipitées une ou plusieurs particules inorganiques d'espaceur, ledit procédé comprenant les étapes suivantes : former une pâte aqueuse des particules inorganiques de base, le cas échéant, broyer la pâte aqueuse afin qu'au moins 50 % des particules inorganiques de base aient une taille inférieure à 0,5 micron ; chauffer la pâte au besoin afin d'atteindre et de maintenir une température d'au moins 40 degrés Celsius ; ajuster le pH de la pâte au besoin afin d'atteindre et de maintenir un pH compris entre 4 et 9 ; ajouter les particules inorganiques d'espaceur à la pâte tout en maintenant de telles conditions de température et de pH et mélanger intensivement ; et enfin récupérer la composition de pigment à partir de la pâte.