PRODUCTION OF CALCIUM CARBONATE,申请号JP19980344030-传众专利搜索

PRODUCTION OF CALCIUM CARBONATE

申请公布号：JP2000169142(A)

申请号：JP19980344030

申请日期：1998.12.03

申请公布日期：2000.06.20

申请人：

MARUO CALCIUM CO LTD

发明人：SHIBATA HIROSHI;FUJIWARA TOSHIO

分类号：C01F11/18;C08K3/26;D21H17/67;(IPC1-7):C01F11/18

主分类号：C01F11/18

摘要：PROBLEM TO BE SOLVED: To obtain a cubic calcite crystal calcium carbonate having a large particle size by ageing acicular aragonite crystal calcium carbonate. SOLUTION: The acicular aragonite crystal calcium carbonate used has preferably 1 to 200μm major diameter, 0.1 to 10μm minor diameter, >=3 aspect ratio and >=3 m2/g and <=30 m2/g BET specific surface area. In order to accelerate ageing, a small amt. of calcite crystal calcium carbonate particles is preferably added to the water slurry of the acicular aragonite crystal calcium carbonate. The amt. of the calcite crystal calcium carbonate preliminarily added is preferably 0.1 to 20 wt.% of the acicular aragonite calcium carbonate particles, and the particle size of the calcite crystal is preferably 0.02 to 10μn. Thereby, a cubic calcite crystal calcium carbonate having a large particle size, preferably >=1μm, can be easily obtd.