Pearlescent pigments with large aspect ratio and a method of their preparation
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United States of America Patent
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Oct 16, 2012
Grant Date -
Dec 31, 2009
app pub date -
Jul 24, 2007
filing date -
Aug 28, 2006
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Abstract
The present invention relates to a pearlescent pigment with large aspect ratio and a method of their preparation, and particularly to pearlescent pigments prepared by coating a metal or metal precursor on the flaky alpha-alumina crystals obtained by using an aluminum precursor aqueous solution and a zinc precursor aqueous solution as main ingredients. The crystals herein has an average particle thickness of 0.5 μm or less, an average particle diameter of 15 μm or higher and a large aspect ratio of 50 or higher, thereby being superior in gloss. The crystals show metal colors and interference colors of silver, gold, red, purple, blue and green.
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