Process for making printed images using pigmented ink jet compositions
AssigneeE. I. Du Pont de Nemours and Company
InventorsSheau-Hwa Ma, Michael Fryd
Life of this patent
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Abstract
Dispersions of an aqueous carrier medium, an insoluble particle, and a graft copolymer dispersant having backbone and side chain portions wherein both portions are prepared from ethylenically unsaturated monomers and either the backbone or sidechain portion is hydrophilic and the other portion is hydrophobic. In a preferred embodiment, the dispersion is formulated as an ink that exhibits excellent resistance to flocculation and provides images with a high color strength and gloss when used in a thermal ink jet printer.
Claims16
A process for making printed images, said process comprising the step of jetting an ink jet ink composition from an ink jet printer, said ink jet ink composition comprising:
- (a) an aqueous carrier medium,
- (b) an insoluble colorant, and
- (c) a salt of a graft copolymer dispersant that is soluble in the aqueous carrier medium, said dispersant having a backbone portion and at least one sidechain portion wherein:
- (i) both portions are prepared from ethylenically unsaturated monomers and the sidearm portion is hydrophilic and the backbone portion is hydrophobic;
- (ii) the ratio of the hydrophobic portion to the hydrophilic portion is in the range of 90:10 to 10:90 by weight;
- and
- (iii) the hydrophobic portion contains at least 50% by weight, based on the total weight of the hydrophobic portion, of at least one monomer selected from the group consisting of aryl esters of acrylic acid, aryl esters of methacrylic acid, N-aryl acrylamide, N-aryl methacrylamide and vinyl aryl esters.
A process for making printed images, said process comprising the step of jetting an ink jet ink composition from an ink jet printer, said ink jet ink composition comprising:
- (a) an aqueous carrier medium,
- (b) an insoluble colorant, and
- (c) a salt of a graft copolymer dispersant that is soluble in the aqueous carrier medium, said dispersant having a backbone portion and at least one sidechain portion wherein:
- (i) both portions are prepared from ethylenically unsaturated monomers and one portion is hydrophilic and the other portion is hydrophobic;
- (ii) the ratio of the hydrophobic portion to the hydrophilic portion is in the range of 90:10 to 10:90 by weight;
- and
- (iii) the hydrophobic portion contains at least 50% by weight, based on the total weight of the hydrophobic portion, of at least one monomer selected from the group consisting of aryl esters of acrylic acid, aryl esters of methacrylic acid, N-aryl acrylamide, N-aryl methacrylamide and vinyl aryl esters;
- wherein the graft copolymer dispersant is cationic and the hydrophilic portion comprises 2-100% by weight of an ionizable monomer that contains amine groups.
Dependencies are inferred from the claim text.