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High transparency pigments

  • US 9,487,657 B2
  • Filed: 08/16/2007
  • Issued: 11/08/2016
  • Est. Priority Date: 08/18/2006
  • Status: Active Grant
First Claim
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1. A method for producing a conditioned pigment comprising:

  • (a) milling a pigment with a dispersant comprising polyurethane having a molecular weight of about 1,000 to about 100,000 to obtain a resulting slurry, wherein at the start of the milling, the milling mixture has a total solids content of about 10 to 50% by weight and the amount of the dispersant is about 1 wt% to 50 wt% based on weight of the pigment; and

    (b) isolating a solid product containing the pigment and the dispersant from the resulting slurry, the solid product being the conditioned pigment;

    wherein the pigment is a perylene.

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