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Method to determine light scattering efficiency of pigments

  • US 6,040,913 A
  • Filed: 01/29/1999
  • Issued: 03/21/2000
  • Est. Priority Date: 01/29/1999
  • Status: Expired due to Term
First Claim
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1. A method to determine light scattering efficiency of a white pigment wherein the light scattering efficiency correlates with performance in an end-use application, comprising:

  • (a) preparing a dilute slurry of a pigment in a continuous liquid medium having a known concentration, where concentration is the concentration of pigment in the slurry;

    (b) measuring the total transmittance (T) of the slurry at a wavelength (λ

    ) of at least 600 nm;

    (c) converting the transmittance measurement (T) to optical density (OD) by the equation
    
    
    space="preserve" listing-type="equation">OD=-log (T)and(d) dividing the optical density by the concentration of the pigment in the slurry to determine light scattering efficiency of the pigment.

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