Process for preparing pigment dispersions used in inks
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United States of America Patent
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Apr 6, 1999
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N/A
app pub date -
May 13, 1997
filing date -
May 13, 1997
priority date (Note) -
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Abstract
A method for making a dispersion for an ink, and the ink obtained from this method. The method comprises preparing a dispersion comprising colorant agglomerates and reducing the agglomerate size using a plastic medium. The dispersion is formed by dispersing the colorant agglomerates in a dispersant, optionally in the presence of a liquid carrier such as distilled or deionized water. The colorant in the dispersion may be a carbon black, yellow, cyan, or magenta pigment, or a combination thereof. The plastic medium is preferably a grinding medium, such as polystyrene.
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