Kaolin pigments, their preparation and use

A pigment product suitable for use in a coating composition to provide a gloss coating on paper, the pigment product comprising a processed particulate kaolin produced from a naturally platy kaolin clay having a particle size distribution such that about 50% to 60% by weight of the particles have an...

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Bibliographische Detailangaben
Hauptverfasser:	HUSBAND JOHN CLAUDE, BROWN, JR. HARRY VINCENT, PANFIL DANIEL JOHN, GOLLEY CHRISTOPHER R. L
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES ARTIFICIAL STONE CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE DYES IMPREGNATING OR COATING OF PAPER INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OFSOLID INORGANIC COMPOUNDS INORGANIC CHEMISTRY LIME, MAGNESIA METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING POLISHES PREPARATION OF CARBON BLACK PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D PRODUCTION OF CELLULOSE PULP COMPOSITIONS REFRACTORIES SLAG TEXTILES TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES TREATMENT OF NATURAL STONE
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Beschreibung
Zusammenfassung:	A pigment product suitable for use in a coating composition to provide a gloss coating on paper, the pigment product comprising a processed particulate kaolin produced from a naturally platy kaolin clay having a particle size distribution such that about 50% to 60% by weight of the particles have an esd less than 2 mum and less than 25% by weight of the particles have an esd less than 0.25 mum and a shape factor of at least 15. In processing, the crude kaolin is ground to a shape factor greater than 50 to produce even greater "platy" clay. The pigment product has a particle size distribution such that at least 80% by weight of the particles have an esd less than 2 mum and greater than 12% and less than 35% by weight of the particles have an esd less than 0.25 mum and whose surface area is greater than 12 m2/g when measured by the BET method.