Magnetic pigments and process of enhancing magnetic properties
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United States of America Patent
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Jul 3, 2012
Grant Date -
Oct 15, 2009
app pub date -
Apr 9, 2008
filing date -
Apr 9, 2008
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Abstract
A pearlescent pigment and a process for enhancing the magnetic properties of a pearlescent pigment. The pearlescent pigment has a layer with regions of γ-Fe2O3 and regions of α-Fe2O3. The magnetic properties of a pearlescent pigment may be enhanced by the steps of: providing a platelet pigment with a layer of Fe2O3, with a magnetic susceptibility less than 0.1×10−5 m3/kg; reducing some or all of the Fe2O3 to Fe3O4; and oxidizing some or all of the Fe3O4 to γ-Fe2O3. The color difference (ΔE*) between the provided pigment and the resultant pigment is not more than about 5.
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