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Stable emissive toner composition system and method

  • US 8,535,865 B2
  • Filed: 08/20/2008
  • Issued: 09/17/2013
  • Est. Priority Date: 08/21/2007
  • Status: Active Grant
First Claim
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1. An emissive toner composition for producing an emissive image component of an image indicia on a substrate, the composition comprising:

  • a photoluminescent agent that emits light having one or more emission peaks in a first emission spectral region, each of said one or more emission peaks centered at a corresponding emission wavelength, when irradiated with a first excitation energy;

    a charge control agent; and

    one or more additives,said photoluminescent agent, charge control agent, and one or more additives being selected and present in an amount in the toner composition such that when the toner composition is printed to produce an image component on a substrate, the emission spectra of the image component for irradiation with said first excitation energy includes only dominant emission peaks in said first emission spectral region corresponding to said one or more emission peaks of said photoluminescent agent, wherein when the toner composition is printed to produce an image component on a substrate, the image component has a photoluminescent toner stability factor of about greater than or equal to 25, wherein the photoluminescent toner stability factor is calculated according to the following equation;


    PTSF=((1−

    ALF-XE)×

    ALF-QUV/CP)×

    100,where PTSF is the photoluminescent toner stability factor, ALF-XE is the average loss in photoluminescence of said image component from day 3 to day 7 of a seven day xenon arc exposure at 0.35 W/m2 at 340 nm with said image component distanced from said xenon arc exposure at 10 inches and a temperature of 50 degrees Celsius, ALF-QUV is the average loss in photoluminescence of said image component from day 3 to day 7 of submission of said image component to QUV exposure conditions, and CP is a number of dominant emission peaks in a desired spectral region of an emission spectra for the image component when irradiated with said first excitation energy prior to said xenon-arc exposure and said QUV exposure.

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