1975 Volume 48 Issue 6 Pages 1857-1861
α-Copper phthalocyanine and calcium carbonate were mixed and ground with a grinder, and then the surface properties of the mixtures were investigated in comparison with the grinding time by means of X-ray diffraction analysis, electron-micrograph observation, and the specific surface area as obtained by the B.E.T. method. In the grinding process, the crystal decays of both α-copper phthalocyanine and calcium carbonate were observed. Particularly, the calcite-aragonite transformation occurred in the case of calcium carbonate. However, the addition of some α-copper phthalocyanine to calcium carbonate interfered with the transformation of calcium carbonate. As a conclusion, it was evident that the surface of calcium carbonate was covered with α-copper phthalocyanine and that the grinding of calcium carbonate was interfered with by the lubricating action of α-copper phthalocyanine.
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