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US 9,335,649 B2Granted
Making a liquid electrophotographic (LEP) paste
AssigneeHewlett-Packard Development Company, L.P.
InventorDoris Chun
Life of this patent
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Abstract
A method of making a liquid electrophotographic (LEP) paste is disclosed herein. A base paste is made by forming a dispersion of a pigment and a non-polar carrier, adding a transparent resin dispersion to the pigment dispersion to form a dispersion mixture, and homogenizing the dispersion mixture. The transparent resin dispersion includes a polymer dispersed in a non-aqueous carrier. The homogenizing may be accomplished by agitating the dispersion mixture at a frequency of less than 1 kHz, thereby forming the paste.
Claims6
A method of making a liquid electrophotographic (LEP) paste, comprising:
- making a silver base paste by:
- forming a silver dispersion of a colorant and a non-polar carrier, the colorant being chosen from i) a pigment having a silver appearance or ii) a combination of the pigment having the silver appearance and an other pigment having a pearlescent optical property;
- adding a transparent resin dispersion to the silver dispersion to form a dispersion mixture, the transparent resin dispersion including a polymer dispersed in a non-aqueous carrier;
- and
- homogenizing the dispersion mixture, the homogenizing being accomplished via a non-impact homogenization process operating at a frequency of less than or equal to 1 kHz;
- and
- mixing a predefined ratio of the silver base paste and a colored paste, thereby producing the LEP paste which exhibits a color that matches an industrial color standard when formed into a final printable ink.
4 more elements
Dependencies are inferred from the claim text.