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AssigneeKyowa Chemical Industry Co., Ltd.
InventorsAkira Okada, Xing Dong Wang, Takatoshi Sato
Estimating the term…
Alunite type compound particles represented by the following general formula (I) and having a specific value of D75/D25 when D25 is the particle diameter of particles which account for 25% of the total and D75 is the particle diameter of particles which account for 75% of the total in the cumulative particle size distribution curve measured by a laser diffraction method: Ma[Al1-xM′x]3(SO42−)y(OH)z.mH2O (I) wherein M is at least one cation selected from the group consisting of Na+, K+, NH4+ and H3O+, M′ is at least one cation selected from the group consisting of Cu2+, Zn2+, Ni2+, Sn4+, Zr4+ and Ti4+, and a, m, x, y and z satisfy 0.8≦a≦1.35, 0≦m≦5, 0≦x≦0.4, 1.7≦y≦2.5, and 4≦z≦7, respectively. The above particles of the present invention have a small average particle diameter, are spherical, disk-like or hexagonal and have an extremely narrow particle size distribution.
Alunite type compound particles which are represented by the following general formula (I) and have a particle size distribution sharpness Ds (=D75/D25) of 1 to 1.4 when D25 is the particle diameter of particles which account for 25% of the total and D75 is the particle diameter of particles which account for 75% of the total in the cumulative particle size distribution curve measured by a laser diffraction method and a spherical particle shape:
Alunite type compound particles which are represented by the following general formula (I) and have a disk-like or hexagonal particle shape:
Dependencies are inferred from the claim text.