Process for making pigmented ink jet inks
AssigneeE. I. DuPont de Nemours and Company
InventorsRobert D. Mitchell, Torence J. Trout
Life of this patent
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Abstract
In accordance with this invention there is provided a process for the preparation of pigmented ink jet inks comprising: (a) mixing at least one pigment and at least one pigment dispersant in a dispersant medium to form a pigmented ink mixture wherein pigment is present in an amount up to 60% by weight based on the total weight of the mixture; (b) deflocculating the pigmented ink mixture by passing the pigmented ink mixture through at least a plurality of nozzles within a liquid jet interaction chamber at a liquid pressure of at least 1,000 psi to produce a substantially uniform dispersion of pigment particles in the dispersant medium.
Claims10
A process for the preparation of pigmented ink jet inks comprising:
- (a) mixing at least one pigment and at least one water soluble pigment dispersant in a carrier liquid selected from the group consisting of water or a mixture of water and at least one water-soluble organic solvent to form a pigmented ink mixture wherein pigment is present in an amount from about 0.1% to about 30% by weight based on the total weight of the mixture;
- and
- (b) deflocculating the pigmented ink mixture by passing the pigmented ink mixture through at least a plurality of nozzles within a liquid jet interaction chamber at a liquid pressure of at least 1,000 psi to produce a substantially uniform dispersion of pigment in the carrier liquid.
Dependencies are inferred from the claim text.