Method for manufacturing pigment dispersed liquid, and pigment dispersed liquid, and ink for ink-jet printer recording using said pigment dispersed liquid
AssigneeSeiko Epson Corporation
InventorsHidehiko Komatsu, Kazuhiko Hara, Hitoshi Ota, Hiroko Hayashi
Life of this patent
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Abstract
A method for manufacturing a pigment dispersed liquid, comprising at least: Step A of introducing a hydrophilic dispersibility-imparting group directly and/or via another atomic group to the surface of pigment particles; Step B of dispersing the pigment obtained in Step A in an aqueous medium; and Step C of conducting refining treatment of the dispersed liquid obtained in Step B.
Claims26
A method for manufacturing a pigment dispersed liquid, comprising the steps of:
- (A) introducing a hydrophilic dispersibility-imparting group directly and/or via another atomic group to the surface of pigment particles;
- (B) dispersing the pigment particles obtained in Step A in an aqueous medium to obtain a dispersed liquid;
- and
- (C) conducting a refining treatment of the dispersed liquid comprising (i) subjecting the dispersed liquid to ultra filtration in which an ultrafiltration film is used to separate the dispersed liquid into the pigment dispersed liquid that does not permeate through the ultrafiltration film and a filtrated liquid comprising impurities that permeate through the ultrafiltration film and a filtrated liquid comprising impurities that permeate through the ultrafiltration film, and (ii) recovering the pigment dispersed liquid, wherein the ultrafiltration film has a molecular cutoff size that results in the filtrated liquid having an absorbance which, at a maximum absorption wavelength, is 1.0 or less when a pigment concentration in the pigment dispersed liquid is converted to 10 wt. %.
A pigment dispersed liquid prepared by ultrafiltration of an aqueous dispersion comprising pigment particles having a hydrophilic dispersibility imparting group thereon, the ultrafiltration forming the pigment dispersed liquid and a filtered liquid, wherein the electric conductivity of the filtered liquid is 10 mS/cm or less when ultrafiltration (molecular cutoff:
- 50,000) is conducted with a pigment concentration of 10 wt % or less.
A pigment dispersed liquid prepared by ultrafiltration of an aqueous dispersion comprising pigment particles having a hydrophilic dispersibility imparting groups thereon, the ultrafiltration forming the pigment dispersed liquid and a filtered liquid, wherein the electric conductivity of the filtered liquid is 1 mS/cm or less when ultrafiltration (molecular cutoff:
- 50,000) is conducted by adjusting a pigment concentration to 1 wt %.
A pigment dispersed liquid prepared by ultrafiltration of an aqueous dispersion comprising pigment particles having a hydrophilic dispersibility imparting group thereon dispersed in an aqueous medium, the ultrafiltration forming the pigment dispersed liquid and a filtered liquid having an absorbance at a maximum absorption wavelength of 1.0 or less when a pigment concentration in the pigment dispersed liquid is converted to 10 wt %.
Dependencies are inferred from the claim text.