Environmentally Pollution-Free Anti-Corrosion Pigment Composition
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United States of America Patent
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Issued Date -
Jan 18, 2007
app pub date -
Sep 14, 2006
filing date -
Mar 18, 2004
priority date (Note) -
Abandoned
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Abstract
The present invention provides an environmentally pollution-free, anti-corrosive pigment composition which is free of any heavy metal such as lead and/or chromium, which is free of zinc and/or water-soluble ions and which is excellent in the anti-corrosive effect. The anti-corrosive pigment composition comprises condensed calcium phosphate prepared by firing a mixture which comprises a calcium-containing component and a phosphorus-containing component and in which the molar ratio (Ca/P=m) of calcium to phosphorus present in these components falls within the following range: 0.50
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