SURFACE-TREATED CALCIUM CARBONATE, METHOD OF PRODUCING THE SAME AND CERAMIC COMPOSITION BLENDED WITH THE SAME

PROBLEM TO BE SOLVED: To provide a surface-treated calcium carbonate which has water dispersibility suitable for ceramic and provides a ceramic composition meeting X7R and X8R characteristics.SOLUTION: A calcium carbonate surface-treated with an organic surface treatment agent has (a) a BET specific...

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Hauptverfasser:	KASAHARA HIDEMITSU, TAKIYAMA SHIGEO
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	ARTIFICIAL STONE CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS CONCRETE INORGANIC CHEMISTRY LIME, MAGNESIA METALLURGY REFRACTORIES SLAG TREATMENT OF NATURAL STONE
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Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a surface-treated calcium carbonate which has water dispersibility suitable for ceramic and provides a ceramic composition meeting X7R and X8R characteristics.SOLUTION: A calcium carbonate surface-treated with an organic surface treatment agent has (a) a BET specific surface area meeting the condition 10≤Sw≤100 (m/g), (b) a thermal reduction meeting the condition 0.1≤As≤5.0 (mg/m), (c) an average particle size meeting the condition 0.03≤Dxs≤3.0 (μm), (d) a total weight of particles of particle sizes beyond 3 μm meeting the condition Dys≤30 (wt.%) and (e) an alkali metal content meeting the condition Is≤0.5 (μmol/m). 【課題】セラミックに好適な水分散能を有し、Ｘ７Ｒ特性やＸ８Ｒ特性を満足するセラミック組成物を与える表面処理炭酸カルシウムを提供する。【解決手段】有機系表面処理剤で表面処理された炭酸カルシウムが、下記の式（ａ）ＢＥＴ比表面積、（ｂ）熱減量、（ｃ）平均粒子径、（ｄ）３μｍを越える粒子径の重量累計、（ｅ）アルカリ金属含有量を満足する表面処理炭酸カルシウムである。（ａ）１０Ｓｗ１００（ｍ2／ｇ）（ｂ）０．１Ａｓ５．０（ｍｇ／ｍ2）（ｃ）０．０３Ｄｘｓ３．０（μｍ）（ｄ）Ｄｙｓ３０（重量％）（ｅ）Ｉｓ０．５（μｍｏｌ／ｍ2）【選択図】なし