Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Aaron M. Hollman0
Philippe Schottland0
Date of Patent
July 3, 2012
0Patent Application Number
121000260
Date Filed
April 9, 2008
0Patent Citations Received
Patent Primary Examiner
Patent 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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