Modification of chargeable pigment particles
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United States of America Patent
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May 22, 2001
Grant Date -
N/A
app pub date -
Jul 24, 1998
filing date -
Jul 24, 1998
priority date (Note) -
Expired
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Abstract
The present invention provides a method for making a non-polar suspension of chargeable pigment particles. A suspension of pigment particles is formed in a non-polar solvent, wherein the pigment particles are inherently ionic or are chargeable, and possess surface anchoring groups on the surface of the pigment particles. The pigment particles are contacted with a polymeric resin comprising a hydrophobic region that is soluble or solvatable in the non-polar solvent and a reactive group that reacts with the surface-anchoring groups on the surface of the pigment particle. The resultant coated pigment particles are stable in non-polar suspensions. In certain embodiments of the present invention, a covalent bond is formed between the pigment and the surface modifying polymer.
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