Bleed control solvents for pigmented and dye-based inks
First Claim
1. An aqueous-based black ink-jet composition having a single liquid phase for ink-jet printing in combination with at least one water-soluble dye-based color ink, said black ink-jet composition containing a black self-dispersing pigment and a vehicle comprising at least one water-miscible organic co-solvent and water, said black ink-jet composition further containing at least one solvent in addition to said at least one water-miscible organic co-solvent and selected from the group consisting of organic esters, diols, and triols, present in an effective amount to reduce bleed between pigment-based, black inks and water-soluble dye-based color inks.
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Accused Products
Abstract
Two classes of solvents, organic esters and diols and triols, help to reduce bleed between black (pigment-containing) inks and color (water-soluble dye-based) inks when used in formulating inks that contain self-dispersed pigments. The solvents help self-dispersed pigments to agglomerate by producing successful mutual collisions when the electrostatic potential is reduced with positively charged color inks. It appears that these solvents may be changing the dielectric constant of the ink, thereby reducing the repulsion potential of the pigment particles themselves.
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Citations
30 Claims
- 1. An aqueous-based black ink-jet composition having a single liquid phase for ink-jet printing in combination with at least one water-soluble dye-based color ink, said black ink-jet composition containing a black self-dispersing pigment and a vehicle comprising at least one water-miscible organic co-solvent and water, said black ink-jet composition further containing at least one solvent in addition to said at least one water-miscible organic co-solvent and selected from the group consisting of organic esters, diols, and triols, present in an effective amount to reduce bleed between pigment-based, black inks and water-soluble dye-based color inks.
- 11. A method for reducing bleed between (a) an aqueous-based black ink having a single liquid phase and containing at least one self-dispersed black pigment and a vehicle comprising at least one water-miscible organic co-solvent and water, and (b) color inks containing water-soluble color dyes, said method comprising adding an effective amount of a solvent selected from the group consisting of organic esters, diols, and triols to said black ink containing said self-dispersed black pigment, said solvent added in addition to said at least one water-miscible organic co-solvent.
- 21. An aqueous-based black ink-jet composition having a single liquid phase for ink-jet printing in combination with at least one water-soluble dye-based color ink, said black ink-jet ink composition containing a black self-dispersing pigment and a vehicle comprising at least one water-miscible organic co-solvent and water, said black ink-jet ink composition further containing at least one solvent in addition to said at least one water-miscible organic co-solvent and selected from the group consisting of organic esters, diols, and triols, present in an effective amount to reduce bleed between pigment-based, black inks and water-soluble dye-based color inks, wherein said organic ester is selected from the group consisting of triethyl citrate and acetyl triethyl citrate, wherein said diol is selected from the group consisting of 2-methyl-2,4-pentanediol, 1,2-octanediol, 2-methyl-1,3-propanediol, 3-methyl-1,5-panetanediol, 2,5-dimethyl-2,5-hexanediol, 1,2-hexanediol, and wherein said triol consists essentially of 3-methyl-1,3,5-pentanetriol, and wherein said diol or said triol, other than 1,2-octanediol, each has concentration in said ink-jet ink ranging from about 0.1 to 10 wt % and wherein said 1,2-octanediol has a concentration ranging from about 0.25 to 1 wt %.
- 26. A method for reducing bleed between (a) an aqueous-based black ink having a single liquid phase and containing at least one self-dispersed black pigment and a vehicle comprising at least one water-miscible organic co-solvent and water, and (b) color inks containing water-soluble color dyes, said method comprising adding an effective amount of a solvent selected from the group consisting of organic esters, diols, and triols to said black ink containing said self-dispersed black pigment, said solvent added in addition to said at least one water-miscible organic co-solvent, wherein said organic ester is selected from the group consisting of triethyl citrate and acetyl triethyl citrate, wherein said diol is selected from the group consisting of 2-methyl-2,4-pentanediol, 1,2-octanediol, 2-methyl-1,3-propanediol, 3-methyl-1,5-pentanediol, 2,5-dimethyl-2,5-hexanediol, 1,2-hexanediol, and wherein said triol consists essentially of 3-methyl-1,3,5-pentanetriol, and wherein said diol or said triol, other than 1,2-octanediol, each has a concentration in said ink-jet ink ranging from about 0.1 to 10 wt % and wherein said 1,2-octanediol has a concentration ranging from about 0.25 to 1 wt %.
Specification