Calcium carbonate

This invention provides a body comprising needle- to pillar-like primary particles of aragonite calcium carbonate irregularly three-dimensionally twined about one another and having an average length (L) of 0.3 to 6.0 mu m and an average width (W) of 0.04 to 0.5 mu m as observed electron microscopic...

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Bibliographische Detailangaben
Hauptverfasser:	TOSHIO KANEGUCHI, TSUNEYOSHI SHIRAISHI, RYOGO TSUKISAKA
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMISTRY COLOUR PRINTING COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS DYES IMPREGNATING OR COATING OF PAPER INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OFSOLID INORGANIC COMPOUNDS INORGANIC CHEMISTRY LINING MACHINES METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING PERFORMING OPERATIONS POLISHES PREPARATION OF CARBON BLACK PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D PRINTING PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES PRODUCTION OF CELLULOSE PULP COMPOSITIONS STAMPS TEXTILES TRANSPORTING 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 TYPEWRITERS
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Beschreibung
Zusammenfassung:	This invention provides a body comprising needle- to pillar-like primary particles of aragonite calcium carbonate irregularly three-dimensionally twined about one another and having an average length (L) of 0.3 to 6.0 mu m and an average width (W) of 0.04 to 0.5 mu m as observed electron microscopically and an aspect ratio (L/W) of 2 to 50, the body containing at least 50% by weight of aragonite crystals as determined by X-ray diffraction and having bulkiness of 5 to 10 ml/g and a specific gravity of 2.75 to 2.93 according to JIS K 5101, and a process for preparing the same.