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US 5,106,417 AGranted
Aqueous printing ink compositions for ink jet printing
AssigneeCiba-Geigy Corporation
InventorsHanspeter Hauser, Karin Reiniger
Life of this patent
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Abstract
Aqueous, low viscosity, stable printing ink compositions suitable for drop-on-demand ink jet printing contain specific selected amounts of a solid pigment preparation, a water-soluble organic solvent, a humectant and water so that the compositions resist clogging ink jet nozzles and give prints of excellent image resolution which are resistant to water and migration.
Claims9
An aqueous printing ink composition for drop-on-demand type ink jet printing which comprises
- (a) 0.5 to 5% by weight of a solid pigment preparation containing 30 to 70% by weight of a pigment and 70 to 30% by weight of a polyacrylic resin which resin contains carboxyl groups and has an acid value in the range of 50 to 300 and an average molecular weight M.sub.w in the range of 30,000 to 60,000;
- (b) 2 to 10% by weight of a water-dilutable organic solvent selected from the group consisting of C.sub.1 -C.sub.4 -alkanols, lower aliphatic ketones, cellosolves, carbitols, N-methyl-2-pyrrolidone, 2-pyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide and mixtures thereof;
- (c) 2 to 15% by weight of a humectant selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, dipropylene glycol, glycerol and poly(ethylene glycol);
- and
- (d) water;
- and
- with the viscosity of the aqueous ink jet printing ink composition being in the range of 2 to 5 mPa-s.
4 more elements
Dependencies are inferred from the claim text.