Inkjet recording liquid and process for the production thereof
First Claim
1. A process for the production of an inkjet recording liquid, which comprises mixing and dispersing a water-based dispersion of an organic pigment and a water-based dispersion of resin particles having an average particle diameter of 50 to 300 nm, to form a water-based dispersion of colorant particles formed by coating each of the resin particles with the organic pigment, wherein the water-based dispersion of the organic pigment is obtained by dispersing the organic piqment in a water-based liquid to prepare a dispersion and allowing the dispersion to pass a flow path having at least two corner portions under a liquid pressure of 100 to 1,000 kg/cm2.
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Abstract
An inkjet recording ink having excellent water resistance and having excellent ejection stability through a nozzle, which ink is obtained by dispersing colorant particles in a water-based liquid, the colorant particles being a product formed by coating each of resin particles having an average particle diameter of 50 to 300 nm with an organic pigment.
55 Citations
15 Claims
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1. A process for the production of an inkjet recording liquid, which comprises mixing and dispersing a water-based dispersion of an organic pigment and a water-based dispersion of resin particles having an average particle diameter of 50 to 300 nm, to form a water-based dispersion of colorant particles formed by coating each of the resin particles with the organic pigment, wherein the water-based dispersion of the organic pigment is obtained by dispersing the organic piqment in a water-based liquid to prepare a dispersion and allowing the dispersion to pass a flow path having at least two corner portions under a liquid pressure of 100 to 1,000 kg/cm2.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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12. A process according to claim 1, wherein the water-based dispersion of the organic pigment is prepared by kneading the organic pigment together with a water-soluble inorganic salt and a water-soluble solvent to obtain a kneaded mixture, dispersing the kneaded mixture in water and then removing the water-soluble inorganic salt and the water-soluble solvent.
- 13. A process according to claim 12, wherein a compound of the formula (1) is further added for the kneading,
- space="preserve" listing-type="equation">P--[X--Y--Z--N(R.sup.1)R.sup.2 ].sub.n (
1)
wherein P is an organic dyestuff residue, a heterocyclic ring residue or an aromatic polycyclic compound residue, X is a divalent binding group composed of a chemically rational combination of 2 to 15 atoms selected from S, C, N, O and H, Y is a direct bond or a divalent binding group selected from --NR-- (in which R is H or an alkyl group having 1 to 18 carbon atoms) or --O--, Z is an alkylene group having 1 to 6 carbon atoms, each of R1 and R2 is independently an alkyl group having 1 to 18 carbon atoms which alkyl group may have a substituent, provided that R1 and R2 may together form a heterocyclic ring which may have a substituent, and n is an integer of 1 to 3. - space="preserve" listing-type="equation">P--[X--Y--Z--N(R.sup.1)R.sup.2 ].sub.n (
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14. A process according to claim 1, wherein the water-based dispersion of the organic pigment is obtained by dispersing the organic pigment and a dispersing agent in the water-based liquid to prepare a dispersion and allowing the dispersion to pass the flow path recited in claim 1.
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15. A process according to claim 1, wherein the water-based dispersion of the organic pigment is obtained by dispersing the organic pigment in the water-based liquid to prepare a dispersion, adding a dispersing agent to the dispersion to obtain a mixture and allowing the mixture to pass the flow path recited in claim 1.
Specification
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- Resources
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Current AssigneeTOYO Ink Manufacturing Company Limited
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Original AssigneeTOYO Ink Manufacturing Company Limited
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InventorsAida, Seiji, Sawada, Seiji, Iida, Yasuharu, Fujigamori, Tsutomu, Uraki, Hisashi, Satake, Sunao
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Primary Examiner(s)NILAND, PATRICK DENNIS
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Application NumberUS09/028,325Time in Patent Office735 DaysField of Search523/204, 523/207, 523/220, 523/222, 523/160, 523/161, 523/200, 523/210, 106/31.13, 106/31.65US Class Current523/161CPC Class CodesC09D 11/32 characterised by colouring ...
