Method of manufacturing inorganic pigment
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United States of America Patent
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Oct 26, 1999
Grant Date -
N/A
app pub date -
Oct 27, 1997
filing date -
Mar 26, 1996
priority date (Note) -
Expired
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Abstract
The invention provides a method for producing colorful inorganic pigments, which comprise complex oxides of various elements, which have good weather resistance and good heat resistance, and which are widely used in colorants for ceramics and in colorants for coatings and plastics. In the method, the composite oxides are sintered at a low temperature for a short period of time to give homogeneous and well colored pigments. Under the sintering conditions, the composite oxides are not sintered excessively. The grinding step in the method is simplified. The method comprises mixing oxides of elements to constitute specific inorganic pigments, or compounds that can be converted into such oxides under heat, in predetermined ratios, followed by calcining the resulting mixtures, and is characterized in that the raw materials are dry-processed in a grinding machine, without being subjected to said mixing step, to thereby give to the raw materials sufficient energy enough to induce the mechanochemical reaction of the materials to compound them into composite particles comprising the raw materials in the compounding ratios.
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