WO2013115190A1 - Encre et utilisation associée - Google Patents

Encre et utilisation associée Download PDF

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Publication number
WO2013115190A1
WO2013115190A1 PCT/JP2013/051922 JP2013051922W WO2013115190A1 WO 2013115190 A1 WO2013115190 A1 WO 2013115190A1 JP 2013051922 W JP2013051922 W JP 2013051922W WO 2013115190 A1 WO2013115190 A1 WO 2013115190A1
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Prior art keywords
ink
binder resin
particles
colorant
resin particles
Prior art date
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PCT/JP2013/051922
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English (en)
Japanese (ja)
Inventor
大西　勝
Original Assignee
株式会社ミマキエンジニアリング
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Application filed by 株式会社ミマキエンジニアリング filed Critical 株式会社ミマキエンジニアリング
Publication of WO2013115190A1 publication Critical patent/WO2013115190A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/10—Printing inks based on artificial resins
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks
    • C09D11/32—Inkjet printing inks characterised by colouring agents
    • C09D11/322—Pigment inks
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
    • D06P5/30—Ink jet printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0023—Digital printing methods characterised by the inks used
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0041—Digital printing on surfaces other than ordinary paper
    • B41M5/0047—Digital printing on surfaces other than ordinary paper by ink-jet printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0041—Digital printing on surfaces other than ordinary paper
    • B41M5/0064—Digital printing on surfaces other than ordinary paper on plastics, horn, rubber, or other organic polymers

Definitions

  • the present invention relates to ink and its use.
  • JP 2010-180419 A (published on August 19, 2010) JP 2010-84066 A (released on April 15, 2010)
  • the smaller the diameter of the pigment particles in the ink is about 1/10 or less than the nozzle diameter of the inkjet head, the better the ejection stability in inkjet printing.
  • the pigment particles have a large diameter, the ink is difficult to bleed on the print medium, but the solvent due to the presence of the pigment before the ink comes out in a columnar shape from the nozzle and becomes spherical due to the surface tension during ink ejection. Due to the discontinuity, the ink is easily cut off at the interface between the pigment and the solvent, and the ejection stability is lowered.
  • the particle diameter of the microcapsule is the structure in which the core pigment particle is coated with a shell resin. Is small and causes ink to spread on the print medium.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide an ink capable of preventing ink bleeding on a print medium while maintaining ink ejection stability. is there.
  • the ink according to the present invention is such that the binder resin particles are dispersed in a dispersion solution as a dispersoid, and the colorant is dispersed or dissolved in the binder resin particles. It is a feature.
  • the discharge stability is lowered when the particle size of the pigment particles exceeds 200 nm. Even if the particles of the binder resin dispersed or dissolved in the resin are enlarged, the particles are easily formed into a substantially spherical shape or a substantially elliptical shape, so that the surface area is minimized.
  • By ensuring lyophilicity it is possible to ensure ejection stability without being affected by nonuniformity due to the colorant. That is, by increasing the resin particles encapsulating the colorant contained in the ink, it is possible to prevent ink bleeding on the print medium while maintaining ink ejection stability without being affected by the colorant. Is possible.
  • the ink according to the present invention evaporates quickly on the print medium, it is possible to prevent the ink from bleeding.
  • the average particle size of the binder resin particles is preferably 50 nm or more.
  • the discharge stability can be ensured, so that the ink bleeding on the print medium and the binder resin Particle aggregation and colorant alteration can be further prevented.
  • the average particle size of the binder resin particles is preferably 80 nm or more.
  • the discharge stability can be ensured, so that the ink bleeding on the print medium and the binder resin can be ensured while ensuring the discharge stability. Particle aggregation and colorant alteration can be further prevented.
  • the binder resin particles are preferably formed by emulsion polymerization or suspension polymerization of a binder resin material monomer and the colorant.
  • the binder resin particles are easily formed into a substantially spherical shape or a substantially elliptical shape, so that the discharge stability is ensured even when the binder resin particles are enlarged.
  • the average content ratio of the binder resin and the colorant is preferably 20:80 to 95: 5 by weight.
  • the above configuration can further suppress the precipitation of the binder resin particles.
  • the binder resin particles preferably have a substantially spherical shape, a substantially elliptical shape, or a substantially disk shape.
  • the average particle diameter of the colorant is preferably 50 nm or less.
  • the colorability of the ink is further improved, and high-definition printing is possible.
  • the colorant is included in the particles of the binder resin, the light resistance of the ink can be improved even if the average particle diameter of the colorant is reduced to 50 nm or less.
  • the colorant comprises an organic pigment, an inorganic pigment, a disperse dye, an acid dye, a reactive dye, titanium oxide, magnetic particles, alumina, silica, ceramic, carbon black, metal nanoparticles, and an organic metal. It is preferably at least one selected from the group. Further, the surface of the colorant may be coated with a polymer or a surfactant in order to improve the dispersibility in the binder resin.
  • ink that can be used for various purposes can be provided.
  • the binder resin is preferably at least one resin selected from a polymer compound that is cured by light or heat or cured.
  • ink that can be used for various purposes can be provided.
  • the binder resin is preferably an ultraviolet curable polymer compound.
  • the dispersion solution is water or a hydrophilic solvent
  • the binder resin particles are preferably emulsion or suspended in the water or the hydrophilic solvent.
  • the main component of the dispersion solution is preferably at least one of water and a hydrophilic solvent, and the surface of the binder resin particles is preferably subjected to a hydrophilic treatment.
  • the binder resin particles in contact with water or a hydrophilic solvent has an affinity for water or the hydrophilic solvent
  • the binder resin particles are suitably dispersed in the dispersion solution.
  • the affinity with the dispersion is ensured on the surface of the hydrophilic binder resin, it is not necessary to select hydrophilic binder resin materials and colorants, and various binder resin materials and colorants can be used. Can be used.
  • the hydrophilization treatment is preferably an emulsification treatment for emulsifying the surface using a surfactant or a dispersant, or an introduction treatment for introducing a hydrophilic group into the surface.
  • the surface of a binder resin particle can be hydrophilized suitably.
  • the average particle diameter of the binder resin particles is preferably 800 nm or more.
  • the colorant is preferably particles containing a rare earth metal.
  • the ink can be suitably used as so-called stealth ink.
  • the stealth ink By using an ink containing particles containing a rare earth metal as the stealth ink, the ink is more stable and a printed matter with high brightness can be obtained. Further, since the particles containing rare earth metal are encapsulated in the binder resin particles and the ink is rapidly evaporated on the print medium, it is possible to prevent the ink from bleeding on the print medium.
  • a simple ink even on a print medium that easily bleeds, such as fabric and leather, printing can be performed without causing any pretreatment without causing any pretreatment. That is, using the ink of the present invention as stealth ink, it can be suitably printed on fabric, leather, etc., and ink suitable for printing a mark for authenticity identification on fabric and leather products is used. Can be provided.
  • the ink according to the present invention it is preferable that a resin different from the binder resin is dissolved in the dispersion solution.
  • the viscosity of the ink can be adjusted. Further, when moisture in the ink flies by drying, the binder resin can be further strongly bonded as a binder when the other resin is formed into a film by bonding between the binder resins. Then, by using the other resin as a binder and binding the binder resins strongly, it is possible to prevent ink bleeding on the print medium.
  • the surface of the binder resin particles is preferably coated with a surfactant such as a polymer or a monomer.
  • the binder resin particles are microencapsulated with the surfactant.
  • the colorant may be exposed from the surface of the binder resin particles.
  • the ejection stability of the ink is lowered.
  • the surface of the binder resin particles by coating the surface of the binder resin particles with a surfactant, the dispersibility of the binder resin particles in the dispersion solution can be improved, and ink bleeding can be more effectively prevented. Also, by coating the surface of the binder resin particles with a surfactant, the particle surface is strengthened, the light resistance and color development of the ink are improved, and a strong ink film can be formed on the printing medium.
  • the binder resin particles preferably include flat particles having at least one elliptical cross section.
  • the flat particles fall down so that the long axis, which is the longest diameter among the diameters passing through the center of gravity of the flat particles, is along the surface of the print medium. That is, in the ink layer formed on the print medium, the flat particles are oriented so that their long axes are along the surface of the print medium.
  • the ink jet recording method includes a discharge step of discharging the ink onto a print medium, and a first heating step of heating the ink that has landed on the print medium at a temperature at which the solvent in the dispersion solution is evaporated. It is characterized by doing.
  • the binder resin is a polymer compound that is cured by heat
  • the ink that has landed on the print medium is dissolved at a temperature at which the binder resin is dissolved after the first heating step. It is preferable to further include a second heating step of heating.
  • the ink can be fixed more firmly on the print medium.
  • the method when the binder resin is a polymer compound that is cured by light, the method further includes an irradiation step of irradiating the ink landed on the print medium with light after the first heating step. It is preferable to do.
  • the average particle diameter of the binder resin particles is preferably 1/10 or less of the nozzle diameter of the nozzle for discharging the ink in the discharging step.
  • the discharge stability is further improved by the above configuration.
  • the printing medium is particularly effective when it is a non-absorbing medium such as plastic, paper, or fabric that is likely to cause bleeding.
  • the ink production method according to the present invention is not limited to a specific method, but is any one of a binder resin liquid and a binder resin material liquid in which a colorant is dispersed or dissolved. It is characterized by including a step of putting the liquid in a liquid incompatible with the liquid and stirring.
  • the ink according to the present invention can be preferably manufactured.
  • the binder resin particles are dispersed in the dispersion solution as a dispersoid, and the colorant is dispersed or dissolved in the binder resin particles. While maintaining, it is possible to prevent the ink from bleeding on the print medium.
  • FIG. 2A to 2C are schematic views showing a state in which ink according to an embodiment of the present invention lands on a medium (print medium) to print the medium. It is a graph which shows the relationship between the particle size of the coloring agent contained in an ink, and the performance of an ink.
  • 4A to 4C are schematic views showing a state in which a medium is printed with ink according to another embodiment of the present invention. It is a figure which shows the flow of one Embodiment of the manufacturing method of the ink which concerns on this invention.
  • the binder resin particles are dispersed as a dispersoid in the dispersion solution, and the colorant is dispersed or dissolved in the binder resin particles.
  • binder resin particles are referred to as “binder resin particles” in the present specification.
  • “ink” includes not only a colored liquid for coloring a printing medium but also a coating agent for coating the printing medium, and may be a transparent liquid.
  • FIG. 1 is a diagram schematically showing the configuration of binder resin particles contained in an ink according to an embodiment of the present invention. As shown in FIG. 1, a plurality of colorants are dispersed or dissolved in one binder resin particle.
  • the colorant is encapsulated in a hydrophilic binder resin or a solution-processed binder resin that has been hydrophilically processed and polymerized in a spheroidized state due to the surface tension of the liquid binder resin.
  • the problem caused by the non-uniformity of the characteristics and the problem caused by the variation in the shape of the colorant are solved.
  • the surface area where the binder resin and the solvent come into contact with each other can be minimized, the disturbance of the solvent performance due to the particles is eliminated, and the discharge stability is improved.
  • Examples of the method of encapsulating the colorant particles in the binder resin and the method of obtaining the binder resin particles having a desired particle diameter include an emulsion polymerization aggregation method, a suspension polymerization method, a dissolution suspension method, and an ester extension polymerization method. It is done.
  • the pigment is dispersed in the dispersion solution as compared with the conventional ink in which the pigment is dispersed in the dispersion solution as it is.
  • the diameter of the particles increases and lands on the print medium, bleeding due to the fine colorant that easily moves in the solvent is less likely to occur.
  • the binder resin particles are dispersed in the dispersion solution as a dispersoid, even when the ink is rapidly evaporated and the average particle diameter of the binder resin particles is small, the binder resin particles are dispersed on the printing medium. Ink bleeding can be further prevented. Therefore, printing on various print media is possible.
  • the discharge stability decreases when the particle size of the pigment particles exceeds 200 nm.
  • the colorant is contained inside the ink. Even if the particles of the dispersed or dissolved binder resin are enlarged, the particles are easily formed into a substantially spherical shape or a substantially elliptical shape, so that the discharge stability can be ensured. That is, it is possible to prevent bleeding of the ink on the print medium, particularly by making the binder resin particles larger than 200 nm while maintaining the ejection stability of the ink.
  • the specific material of the binder resin used in the ink of the present invention is not particularly limited as long as it is insoluble in the vehicle, but is at least selected from a polymer compound that is cured by polymerization with light or heat or is cured. It is preferably a kind of resin, and may be a monomer, an oligomer, and a low molecular weight resin that are cured by polymerization reaction by irradiation with energy rays such as ultraviolet rays, electron beams, radiation, or heat.
  • the “vehicle” refers to a component other than the binder resin in which fine particles are dispersed or dissolved in the ink according to the present invention, and a dispersion solution, an additive, a cosolvent, and the like described later are intended.
  • binder resins examples include vinyl resins, acrylic resins, alkyd resins, polyester resins, urethane resins, styrene resins, styrene copolymer resins, silicon resins, fluorine resins, epoxy resins, Examples thereof include phenoxy resins, polyolefin resins, and modified resins thereof.
  • acrylic resins, polyurethane resins, polyester resins, and acrylic resins are particularly preferred are polyester resins and acrylic resins.
  • the binder resin examples include natural rubber latex, styrene butadiene latex, styrene-acrylic latex, polyurethane latex and the like.
  • the binder resin for example, it is more preferable to use a stock solution of these resins and a solution obtained by subjecting the stock solution to an emulsion polymerization reaction, since the low-viscosity liquid resin before polymerization tends to be spherical when dispersed in water.
  • these resins may be a polymer dispersion type that requires a dispersant or a self-dispersion type (reference: see Japanese Patent Application Laid-Open No. 2001-152063).
  • Examples of the cured polymer compound include those listed in Table 1 below. These can be used alone or in combination. Furthermore, in order to improve the adhesion to the recording medium and the fixing property at low temperature heating, it is preferable to use a combination of a resin having a small glass transition point (TG) and a resin having a large TG and high fastness.
  • TG glass transition point
  • the ink of the present invention is particularly preferably an aqueous latex ink containing water or a hydrophilic organic solvent as a dispersion solution, and a binder resin being emulsified or suspended in the water or the hydrophilic organic solvent.
  • the aqueous latex ink may contain a non-hydrophilic organic solvent having an affinity for the hydrophilic organic solvent in addition to water or the hydrophilic organic solvent.
  • the ink of the present invention is an aqueous latex ink in which the binder resin is emulsified or suspended in water, it can be said that an aqueous emulsion or aqueous suspension is formed by the resin.
  • the aqueous latex ink may further contain an emulsifier for emulsifying or suspending the resin.
  • the colorant dispersed or dissolved in the binder resin particles are not particularly limited as long as they are insoluble in the vehicle, and various colorants can be used depending on the purpose.
  • Specific colorants include, for example, organic pigments, inorganic pigments, disperse dyes, oxidation dyes, reactive dyes, hollow organic resin particles, titanium oxide, magnetic particles, alumina, silica, ceramics, carbon black, metal nanoparticles, and organic There may be mentioned at least one kind of particles selected from the group consisting of metals.
  • the metal nanoparticle material include gold, silver, copper, and aluminum.
  • titanium oxide it can be suitably used as a white paint.
  • the surface of the colorant may be coated with a polymer or a surfactant in order to improve the dispersibility in the binder resin.
  • a plurality of colorant particles may be dispersed or dissolved in the binder resin particles.
  • five or more colorant particles are dispersed or dissolved.
  • the colorant dispersed or dissolved in the binder resin particles may be one type, but may be a plurality of types.
  • dispersion solution examples are not limited as long as they do not dissolve the binder resin, and various dispersion solutions can be employed depending on the purpose.
  • Specific examples of the dispersion solution include water. Water can be suitably used for applications such as inks for commonly used ink jet printers because of its safety and no environmental pollution. Since water alone has a high drying speed and causes nozzle clogging of the inkjet head, it is more preferable to add a humectant to the water. Also, in order to prevent bleeding by rapid evaporation when heated by a heater on the media, an organic solvent having a boiling point lower than that of water is added to water, or higher than water is used to reduce nozzle clogging. More preferably, a boiling organic solvent is added to water.
  • the binder resin particles are more preferably 5% by volume to 60% by volume, and more preferably 7% by volume to 40% by volume with respect to the total amount of the ink. Further preferred.
  • the ink according to the present invention may contain an additive in addition to the binder resin particles containing the colorant and the dispersion solution.
  • the kind of the additive may be appropriately selected depending on the purpose, and examples thereof include a surfactant, a coupling agent, a buffering agent, a biocide, a metal ion sealing agent, a viscosity modifier, and a solvent.
  • the additive may be dispersed in the binder resin particles, or may be present outside the binder resin particles and in the dispersion solution.
  • the binder resin itself colored with a dye may be used as the binder resin particles.
  • a polyester resin encapsulating a disperse dye is heated to dissolve the disperse dye, and the resin dyed with the disperse dye, a nylon resin mixed with an acid dye or a reactive dye is heated to dissolve the dye, and the acid dye Or what dye
  • the average particle size of the binder resin particles is preferably 50 nm or more, more preferably 50 nm or more and 500 nm or less, and most preferably 80 nm or more and 300 nm or less.
  • the average particle diameter of the binder resin means an average particle diameter of a plurality of binder resin particles dispersed in the dispersion solution.
  • the ejection stability from the nozzle is further improved. Can be made.
  • the particle size of the binder resin particles is controlled by controlling the polymerization conditions when forming the binder resin particles by the emulsion polymerization aggregation method, suspension polymerization method, dissolution suspension method, ester elongation polymerization method, etc. Can do.
  • the ink of the present invention since the colorant is dispersed or dissolved in the binder resin particles, the fine particles of the colorant that cause aggregation are not present in the ink as they are, and aggregation of the colorant can be prevented. In addition, a dispersant for dispersing the colorant in the dispersion solution becomes unnecessary. In other words, the disadvantage of the conventional ink that the fine particles of the pigment are aggregated can be solved.
  • the aggregation of particles is suppressed as the particle diameter in the dispersion solution is larger, by making the average particle diameter of the binder resin larger than 50 nm, aggregation of the binder resin particles is suppressed, Further, since the colorant dispersed or dissolved in the binder resin particles is fixed in the binder resin, aggregation of the colorant can be completely suppressed.
  • the colorant is included in the binder resin and protected by the binder resin, the influence of ultraviolet rays on the colorant can be suppressed and the light resistance of the ink can be improved.
  • the influence of oxygen on the colorant can be suppressed. That is, it is possible to greatly suppress colorant alteration due to the influence of ultraviolet rays or oxygen.
  • the larger the diameter of the binder resin particles encapsulating the colorant the more the deterioration of the colorant can be suppressed. Therefore, by making the average particle diameter of the binder resin larger than 50 nm, the quality of the colorant Can be further suppressed.
  • the binder resin particles are dispersed as a dispersoid in the dispersion solution, the ink evaporates quickly, and even when the average particle diameter of the binder resin particles is as small as 50 nm, for example, on the printing medium. Ink bleeding can be further prevented. As a result, if the ink of the present invention is used, it is possible to print on various printing media.
  • the average particle size of the colorant may be smaller than the particle size of the binder resin particles, and is preferably 80 nm or less, more preferably 5 nm or more and 80 nm or less, and 10 nm or more and 50 nm. Most preferably:
  • the average particle diameter of the colorant means the average particle diameter of a plurality of colorants dispersed in the binder resin particles.
  • Fine particles having a constant particle size distribution can be obtained by controlling the particles to have a constant particle size distribution in the production process or by classifying particles having a wide particle size distribution after production.
  • the colorant can be further reduced in diameter, and the colorability of the ink is improved and high-definition printing can be realized.
  • the colorant is improved as the colorant has a smaller diameter, when the average particle diameter of the colorant is 50 nm or less, the colorability of the ink is further improved and higher-definition printing is possible. Furthermore, since the colorant is encapsulated in the binder resin particles, the light resistance of the ink can be improved even if the average particle diameter of the colorant is reduced to 50 nm or less.
  • the average content ratio between the binder resin and the colorant in the binder resin particles is preferably 20:80 to 95: 5, and preferably 75:25 to 95: 5. Is more preferable, and most preferably 65:35 to 90:10.
  • the average content ratio between the binder resin and the colorant means the average content ratio between the binder resin and the colorant in the plurality of binder resin particles dispersed in the dispersion solution.
  • Control of the average content ratio of the binder resin and the colorant is to control the polymerization conditions when forming the binder resin particles by the emulsion polymerization aggregation method, suspension polymerization method, dissolution suspension method, ester elongation polymerization method, etc. Etc.
  • the colorant is dispersed or dissolved and fixed in the solid or semi-solid binder resin particles, precipitation of the colorant can be prevented.
  • the ratio between the binder resin and the colorant that forms the binder resin particles is preferably within a certain range in order to achieve both the coloring power and the inclusion of the colorant in the binder resin.
  • the average content ratio of the binder resin and the colorant is preferably in the range of 40:60 to 95: 5 by weight.
  • the resin ratio in the binder resin particles is preferably 50% or more, and when the ink is another color ink, the resin ratio in the binder resin particles is 70% or more. It is preferable that
  • the binder resin particles preferably have a substantially spherical shape or a substantially elliptical shape in order to reduce the specific surface area.
  • the binder resin particles are substantially spherical or elliptical, ink ejection stability is further improved.
  • the binder resin particles in the ink of the present invention may be formed by emulsion polymerization or suspension polymerization, or dissolution suspension polymerization or ester extension polymerization of a binder resin material monomer and a colorant. Details of the method of forming the binder resin particles will be described later.
  • the ink of the present invention it is possible to prevent bleeding of the ink on the print medium while maintaining the ejection stability of the ink. Further, according to the ink of the present invention, it is possible to prevent the aggregation and precipitation of particles in the ink, to suppress the influence of ultraviolet rays and oxygen on the colorant, to prevent the colorant from deteriorating, and to improve the colorability of the ink. It is possible to improve and achieve higher-definition printing.
  • FIG. 3 is a graph showing the relationship between the particle size of the binder resin particles contained in the ink and the performance of the ink.
  • the horizontal axis represents the particle diameter, and the particle diameter is larger toward the left in the figure.
  • the vertical axis represents the state of each property of the ink, and the upper part of the figure indicates that the state of each property of the ink is better.
  • the line (a) in FIG. 3 shows the relationship between the colorability of the ink and the particle size of the binder resin particles in the ink, and the line (b) shows the ink ejection stability and the binder resin in the ink.
  • the line of (c) shows the relationship between the precipitation state of the binder resin particles in the ink and the particle size of the binder resin particles in the ink.
  • the line (d) in FIG. 3 shows the light resistance of the binder resin particles in the ink
  • the line (e) shows the state of ink bleeding on the print medium and the binder resin particles in the ink.
  • the line (f) shows the relationship between the aggregated state of the binder resin particles in the ink and the particle size of the binder resin particles in the ink.
  • the ink colorability, ejection stability, and precipitation state are better (good) as the particle size is smaller, and worse (inferior) as the particle size is larger. That is, when the diameter of the particles in the ink is increased, the colorability and ejection stability are lowered, and the particles are easily precipitated.
  • the light resistance, bleeding, and aggregation state of the ink are better (good) as the particle size is larger, and worse (inferior) as the particle size is smaller. That is, when the particles in the ink have a small diameter, the light resistance is lowered, the ink is likely to bleed, and the particles are likely to aggregate.
  • the particle size of the pigment contained in the ink is small, the colorability, the ejection stability and the precipitation state are good, but the light resistance, the bleeding and the aggregation state are not good.
  • the ink of the present invention since the binder resin particles in which the colorant is dispersed or dissolved are used, the particle diameter can be increased. Accordingly, as represented by the lines (d) to (e), the ink of the present invention has excellent light resistance, particles are less likely to aggregate, and are less likely to bleed.
  • the binder resin particles are formed by emulsion polymerization or suspension polymerization, the particles are likely to be spherical, and even if the particle size is increased, the ejection stability is not easily lowered. Accordingly, the discharge stability is excellent as represented by the line (b).
  • the binder resin particles in which the colorant is dispersed are dispersed, the content ratio of the binder resin to the colorant in the ink is increased, and even if the particle size is increased, the colorant Since the average specific gravity is smaller than that of the single substance, the colorant is hardly precipitated as represented by the line (c). Moreover, since the particle
  • the ink of the present invention when the content ratio of the colorant in the ink is increased in order to increase the concentration of the ink, the average specific gravity of the colorant increases and precipitation tends to occur.
  • the particle size of the binder resin particles encapsulating the colorant is reduced.
  • the binder resin particles are dispersed in the dispersion solution as a dispersoid, and therefore, when applied on a print medium, the ink is quickly evaporated and hardly spreads.
  • the average particle size of the binder resin particles may be 50 nm or more, more preferably 50 nm or more and 500 nm or less, and more preferably 80 nm or more. Most preferably, it is 300 nm or less.
  • the binder resin particles in which the colorant is dispersed or dissolved are used, the particle size of the particles contained in the ink is increased. Therefore, with regard to the light resistance, bleeding, and aggregation states that are improved by increasing the particle size, the resin particles having a large particle size serve as anchors, so that they are naturally superior to conventional inks. Become.
  • the ink of the present invention even if the binder resin particle diameter in the dispersion solution is increased by dispersing the binder resin particles in which the colorant is dispersed or dissolved in the dispersion solution, the ejection stability is increased. In addition, the precipitation state and the colorability can be kept good. That is, it can be said that the ink of the present invention is a next-generation ink that can keep the discharge stability, the precipitation state, and the colorability comprehensively while improving the light resistance, bleeding, and aggregation state.
  • the ink of the present invention Since the ink of the present invention has good light resistance, bleeding and aggregation, and good discharge stability, precipitation and colorability, it can be used for printing on various printing media. It can also be suitably used for textile printing.
  • the ink of the present invention can be used as an adhesive or a release agent, or can be used as a coating agent such as a UV cut clear coating agent by adding an ultraviolet absorber. It can also be applied to inorganic hybrid inks and the like.
  • the surface of the binder resin particles may be subjected to a hydrophilic treatment.
  • the binder resin since the surface of the binder resin in contact with water or the hydrophilic solvent has an affinity for water or the hydrophilic solvent, the binder resin is suitably dispersed in the dispersion solution.
  • the binder resin is lipophilic and easily separated in a hydrophilic solvent.
  • the particle size of the binder resin is increased, it becomes easier to separate from the hydrophilic solvent, so that there is a problem that the ink is divided and misted when ejected from the nozzle.
  • FIG. 7 is a graph showing the relationship between the particle size of the particles contained in the ink and the ejection stability.
  • the vertical axis represents an evaluation value obtained by evaluating the ink ejection stability in five stages, and the upper part in the figure indicates that the ejection stability is more excellent.
  • the horizontal axis represents the average particle diameter (nm) of the particles contained in the ink.
  • the line A (dotted line) in FIG. 7 shows the average particle diameter and ejection stability of the binder resin particles when the ink of the present invention containing the binder resin whose surface is hydrophilized is ejected from a nozzle having a nozzle diameter of 25 ⁇ m. Shows the relationship.
  • the line B (solid line) in FIG. 7 shows the relationship between the average particle diameter of the pigment and the ejection stability when conventional ink containing the pigment is directly ejected from a nozzle having a nozzle diameter of 25 ⁇ m.
  • the ink of the present invention has good ejection stability even when the average particle diameter of the binder resin particles is as large as 1200 nm. Further, when the nozzle diameter of the nozzle that discharges the ink is increased, the discharge stability of the ink of the present invention is as indicated by the line A ′ (dotted line) in FIG. 7, and the average particle diameter of the binder resin particles is further increased. Even if it is changed, the discharge stability is good. On the other hand, the ejection stability of the conventional ink is lowered even when the average particle diameter of the pigment is 200 nm. That is, when the ink of the present invention is compared with the conventional ink, as shown by the arrows in FIG. 7, the ink of the present invention has greatly improved ejection stability, and even if the contained particles have a large particle size. Discharge stability does not decrease.
  • the ink of the present invention even if the particle size of the binder resin particles is increased, the particles are not separated in the hydrophilic solvent, so that the ink is not divided in the nozzle and a predetermined amount of ink is discharged from the nozzle. Can be reliably discharged.
  • the affinity with the dispersion solution is ensured on the surface of the new aqueous binder resin, it is not necessary to select hydrophilic binder resin materials and colorants, and various binder resin materials and colorants can be used. Can be used.
  • the hydrophilic treatment on the surface of the binder resin can be performed by a method such as an emulsification treatment in which the surface is emulsified using a surfactant or a dispersant, and an adhesion treatment in which a hydrophilic group is attached to the surface.
  • the surface of the binder resin particles may be coated with a polymer or monomer surfactant.
  • the binder resin particles may be microencapsulated with a surfactant, and the surface of the binder resin particles may be covered with the hydrophobic portion of the surfactant and may be micellar. Good.
  • the colorant may be exposed from the surface of the binder resin particles. In this way, the colorant is exposed from the surface of the binder resin particles, and the ink ejection stability is lowered.
  • the surface of the binder resin particles with a surfactant, the colorant is not exposed from the surface of the binder resin particles even when the particle diameter of the binder resin particles is reduced.
  • the surface of the binder resin particles with a surfactant, the dispersibility of the binder resin particles in the dispersion solution can be improved and ink bleeding can be more effectively prevented. Also, by coating the surface of the binder resin particles with a surfactant, the particle surface is strengthened, the light resistance and color development of the ink are improved, and a strong ink film can be formed on the printing medium.
  • the surfactant that coats the surface of the binder resin particles may be any one that covers the surface of the binder resin particles with the surfactant.
  • a monomer surfactant, a polymer surfactant, an aqueous surfactant, and a non-aqueous surfactant can be mentioned.
  • the monomer surfactant include an anionic surfactant, a cationic surfactant, a nonionic surfactant, and an amphoteric surfactant.
  • the polymer surfactants are classified into natural polymer surfactants, condensation polymer surfactants, and polymerized polymer surfactants.
  • aqueous surfactants include inorganic compounds, natural derivatives, formalin condensates, polymers, and special surfactants.
  • non-aqueous surfactants include alkylbenzene sulfonates, dioctyl sulfosuccinates, alkyl fatty acid salts, olefin / maleic anhydride copolymers, rosinates, alkyl imidazolines, alkyl diamates, and alkylamine acetates. Is mentioned.
  • Anionic surface active agents are those having a negative charge when dissolved in water, as a hydrophilic group, a carboxyl group, sulfuric acid group, sulfate group, and a phosphoric acid ester group, etc., as lipophilic group, C 10 those having a hydrocarbon or the like ⁇ C 18 is generally used.
  • anionic surfactants include fatty acid soap, alkenyl succinate, alkylbenzene sulfonate sodium salt, alkyl naphthalene sulfonate sodium salt, alkyl sulfate sodium salt, polyoxyethylene alkyl ether sulfate sodium salt, dialkyl sulfosuccinate sodium Examples thereof include salts, sodium alkyl phosphate, and polycarboxylic acid type polymer surfactants.
  • Cationic surfactants have a positive charge when dissolved in water, and those having an amine group in a hydrophilic group are generally used.
  • examples of the cationic surfactant include alkyltrimethylammonium chloride and alkyldimethylbenzylammonium chloride.
  • Nonionic surfactants have an oxyethylene chain in the hydrophilic group and are classified into ether type and ester type.
  • Examples of nonionic surfactants include polyoxyethylene alkyl ether, polyoxyethylene alkyl allyl ether, polyoxyethylene polyoxypropylene glycol, and sorbitan fatty acid ester.
  • amphoteric surfactant has a negative charge or a positive charge when dissolved in water.
  • amphoteric surfactants include alkyl betaines and amide betaines.
  • Examples of the natural polymer surfactant include lignin sulfonate obtained by sulfonating natural lignin, carboxymethyl cellulose modified with cellulose, and hydroxyethyl cellulose.
  • Examples of the condensation polymer surfactant include polymers obtained by formalin condensation of naphthalene sulfonate or melamine sulfonate.
  • polymeric polymer surfactant examples include ionic polymers and nonionic polymers obtained by polymerizing monomers having unsaturated bonds typified by acrylic acid.
  • polymeric high molecular surfactants include homopolymers containing aqueous dispersants such as polyacrylates, polystyrene sulfonates, and acrylamides, and non-aqueous dispersants such as polyvinylpyrrolidone.
  • polymeric high molecular surfactant examples include copolymers such as (meth) acrylic acid-maleic acid type, styrene-maleic acid type, acrylic acid-methyl acrylate (ethyl or butyl), maleic acid-isobutylene. It is done.
  • an aqueous dispersion of binder resin particles having an anionic group on the surface is used.
  • examples include a method in which a cationic surfactant is added to the liquid and mixed, and then an anionic surfactant is added for emulsification, and a polymerization initiator is added for emulsion polymerization.
  • the binder resin particles can be obtained.
  • a surfactant such as a styrene-acrylic acid-methacrylic acid terpolymer and a binder resin
  • the binder resin particles can be obtained.
  • the binder resin particles may include flat particles having at least one elliptical cross section.
  • the flat particles of the binder resin having at least one elliptical cross section in the ink, when such ink lands on the print medium, it passes through the center of gravity of the flat particles on the surface of the print medium.
  • the flat particles fall so that the long axis, which is the longest diameter, is along the surface of the print medium. That is, in the ink layer formed on the print medium, the flat particles are oriented so that their long axes are along the surface of the print medium.
  • Such flat particles of the binder resin can be produced by an extension polymerization method.
  • the average particle diameter of the binder resin particles may be 800 nm or more, or 800 nm or more. More preferably, it is 3000 nm or less. Accordingly, it is possible to more reliably prevent bleeding on the printing medium, so that printing can be performed without causing any bleeding without performing any pretreatment on the printing medium such as paper and fabric. Accordingly, it is possible to provide an ink particularly suitable for paper and textile printing.
  • the colorant may be a particle containing a rare earth metal (hereinafter also referred to as a rare earth metal particle).
  • a rare earth metal particle conventionally known phosphor particles containing rare earth metals can be used.
  • the colorant is a phosphor particle containing a rare earth metal
  • it can be suitably used as a so-called stealth ink.
  • Stealth ink emits visible light and can be observed with the naked eye when the printed matter is irradiated with specific light rays such as ultraviolet rays or infrared rays. Ink that can not be. Therefore, stealth ink is used for printing markings for authenticating banknotes, apparel products, and the like.
  • the stealth ink is more stable and a printed matter with high brightness can be obtained.
  • the ink of the present invention since the rare earth metal particles are encapsulated in the binder resin particles, it is possible to prevent bleeding on the printing medium.
  • the print medium can be printed without causing any pretreatment without causing any pretreatment. That is, using the ink of the present invention as stealth ink, it can be suitably printed on fabric, leather, etc., and ink suitable for printing a mark for authenticity identification on fabric and leather products is used. Can be provided.
  • the dispersion solution may further contain an emulsifier for emulsifying or suspending the binder resin.
  • the dispersion solution may contain other resin dissolved in the dispersion solution in addition to the emulsion resin or the suspended binder resin.
  • the other resin is dissolved in the dispersion solution and can adjust the viscosity of the ink.
  • the other resin is further used as a binder as an emulsion or suspension binder resin. It may have a function of strongly bonding.
  • PVA polyvinylpyrrolidone
  • rosin vinyl acetate
  • acrylic acrylic
  • the other resin By using the other resin as a binder and binding the binder resins strongly, it is possible to prevent ink bleeding on the print medium.
  • the inkjet recording method of the present invention includes a discharge step of discharging the ink of the present invention onto a printing medium, and a first heating step of heating the ink that has landed on the printing medium at a temperature at which the dispersion solution is evaporated. .
  • the binder resin is a polymer compound that is cured by heat
  • the ink that has landed on the printing medium is dissolved at a temperature at which the binder resin is dissolved.
  • a second heating step of heating may be further included.
  • only the first heating step can be performed by using a low TG resin or a mixture of a high TG resin and a low TG resin as the binder resin.
  • the heating temperature of the heating process can be lowered.
  • FIGS. 2A to 2C are schematic views showing a state in which ink according to an embodiment of the present invention lands on a medium (print medium) to print the medium.
  • the binder resin particles 1 are dispersed in the dispersion solution.
  • the binder resin particles 1 are stacked on the medium after the ink is discharged onto the medium and landed on the medium (discharge step).
  • the ink ejected to the medium can be ejected from the nozzle, but the average particle diameter of the binder resin particles 1 contained in the ink may be 1/10 or less of the nozzle diameter of the nozzle that ejects the ink. preferable. Thereby, the discharge stability from a nozzle improves more.
  • the ink is heated at a temperature at which water (solvent) in the dispersion solution is evaporated (first heating step).
  • the heating means in the first heating step only needs to be able to heat the ink layer on the medium and evaporate the solvent. Therefore, the heating means is not limited to the above-described form, and the surface on which the ink of the medium has landed is infrared or far. Heating may be performed by irradiating infrared rays, electromagnetic induction heating, applying hot air, or the like.
  • the installation position of the heating means may be in the vicinity of the platen on which the medium is placed in the printer used in the ink jet recording method of the present invention, but may be installed in front of or behind the platen, or outside the printer. It may be attached. As a result, the installation position is not limited as long as the solvent can be evaporated and the ink layer can be dried, polymerized, melted and fixed.
  • the printing can be completed only by heating the ink from the state shown in FIG. 2B and removing the dispersion solution. That is, when a binder resin that does not have thermoplasticity, thermal melting property, or thermal polymerization property is used, the ink can be fixed on the medium only by the first heating step. Since the colorant 2 is dispersed or dissolved in the binder resin particles 1, the heating ink is heated at a high temperature in order to disperse or dissolve the colorant in the binder resin. There is no need to go through.
  • the ink on the medium is further heated at a temperature at which the binder resin is melted (second heating step).
  • the binder resin heated and melted is integrated, the state shown in FIG. 2C is obtained. As a result, the binder resin is firmly fixed on the medium.
  • the colorant 2 is already dispersed or dissolved in the binder resin. Therefore, even when the binder resin is finally fixed to the medium, a high-temperature heating step is further performed to dissolve the binder resin and disperse or dissolve the colorant therein as in the case of the conventional ink. There is no need to do it.
  • the ink according to the present invention has an advantage that the heating temperature for fixing the ink to the medium is low.
  • the colorant and the resin particles are independently dispersed in the dispersion solution, the colorant cannot be dispersed in the dispersion solution unless the resin particles are melted.
  • the ink according to the present invention since the colorant is already dispersed or dissolved in the binder resin, it is not necessary to increase the heating temperature in order to disperse or dissolve the colorant in the binder resin. The heating temperature required for melting and integrating and fixing to the medium is low.
  • the temperature for heating the ink is sufficient, for example, a low temperature of 40 ° C. to 60 ° C., so that the ink in the nozzles of the ink jet head is dried by the high temperature during ink heating. Can be prevented. As a result, ink ejection failure can be prevented.
  • FIGS. 4A to 4C are schematic diagrams showing how ink according to another embodiment of the present invention is fixed to a medium.
  • the ink includes binder resin particles 1 in which a colorant 2 is dispersed or dissolved, and a dispersion solution 3 containing water, a solvent, and a dispersant.
  • a binder resin a high molecular compound curable with ultraviolet light or a high molecular compound curable with ultraviolet light is used.
  • the water (solvent) in the dispersion solution 3 evaporates and the ink that has been heated is presumed to be deposited on the medium 4 after being prevented from bleeding.
  • the binder resin may be temporarily cured by irradiating weak ultraviolet rays together with heating by the heater 5.
  • the binder resin is cured, and the ink film 7 firmly fixed on the medium 4 is formed.
  • the solvent of the ink is evaporated by heating in the first heating process and is cured by ultraviolet irradiation in the irradiation process.
  • a high ink film can be fixed on the media.
  • the medium (printing medium) 4 is particularly effective when it is a non-absorbing medium such as plastic that is likely to cause bleeding, paper, or fabric.
  • the ink jet recording method according to the present invention since the colorant 2 is printed on the media 4 using the ink according to the present invention in which the binder resin particles 1 are encapsulated, the ink bleeding on the media 4 is prevented.
  • By using such an ink it is possible to carry out no pretreatment on the medium 4 even on the medium 4 that is easy to bleed, such as non-absorbent media, paper, fabric, leather, etc. It is possible to print without causing bleeding.
  • the method for producing an ink according to the present invention is a liquid that is either a binder resin liquid or a binder resin material liquid in which a colorant is dispersed or dissolved. Placing in a liquid that does not dissolve and stirring.
  • the liquid of the binder resin material is intended to be a monomer liquid that becomes a desired binder resin by a polymerization reaction, a polymer liquid that becomes a desired binder resin by crosslinking, or the like.
  • any one of the binder resin liquid and the binder resin material liquid (hereinafter referred to as the binder resin liquid) is in a liquid incompatible with the liquid, that is, the ink dispersion according to the present invention. It is preferable to inject a binder resin liquid into the liquid to be used because the binder resin or particles of the material can be dispersed in the dispersion solution.
  • the binder resin liquid When the binder resin liquid is sprayed, it is preferably sprayed at a high speed, and for example, spraying using a sprayer or the like is preferable.
  • a colorant is dispersed or dissolved in advance. Therefore, a binder resin particle in which a colorant is dispersed or dissolved therein or a binder resin material particle dispersed in a dispersion solution is obtained. Then, this dispersion solution is stirred at high speed to be emulsified (emulsified), and binder resin particles having a substantially spherical shape or a substantially elliptic shape are formed in the dispersion solution.
  • a binder resin material When a binder resin material is used, after emulsifying the dispersion solution containing the binder resin material or suspending the binder resin material in the dispersion solution, the binder resin material is appropriately polymerized.
  • a binder resin may be formed by a crosslinking reaction or the like (emulsion polymerization or suspension polymerization).
  • a binder resin material may be polymerized after preparing a mixed solution of an emulsified dispersion solution containing a binder resin material and a binder resin material suspended in the dispersion solution.
  • the ink according to the present invention or the stock solution of the ink according to the present invention before the desired concentration can be obtained.
  • the binder resin particles become substantially spherical or substantially elliptical due to the surface tension of the binder resin.
  • the dispersion liquid containing the binder resin liquid and the binder resin material liquid is emulsified or suspended at high speed, so that the binder resin particles are substantially spherical or It becomes a substantially elliptical shape, and the chains between the resins do not entangle.
  • the ejection stability of the ink is improved and the solubility in the dispersion solution is also improved.
  • a colorant dispersion solution in which a colorant is dispersed in a binder resin dispersion solution prepared by emulsion polymerization of a dispersion solution containing a binder resin material, a wax dispersion solution, a flocculant
  • the binder resin particles may be produced by an emulsion polymerization aggregation method in which an electrolyte is added and mixed, and heated and stirred to form aggregated particles of the colorant and the binder resin.
  • the fusion state, shape, and surface properties of the aggregated particles can be controlled by controlling the pH, temperature, time, and the like during aggregation. After controlling these, the aggregated particles are washed and dried to produce binder resin particles.
  • a colorant is added to a thermosetting binder resin material, the resin material is dissolved in a solvent, and the solvent is vigorously mixed to finely form suspension droplets.
  • the binder resin particles may be produced by a dissolution suspension method in which the particle size is increased.
  • polyester resin, colorant and wax are dispersed in an organic solvent to form an oil phase, and the water phase in which the particle control agent is dispersed in water and the oil phase are mixed to contain a colorant having a sharp particle size distribution.
  • polyester polymer particles containing a colorant may be formed by simultaneous polymerization reaction and used as binder resin particles contained in the ink of the present invention.
  • FIG. 5 is a diagram showing a flow of an embodiment of the ink manufacturing method according to the present invention.
  • FIG. 6 is a diagram schematically showing a configuration of an apparatus used in an embodiment of the ink manufacturing method according to the present invention.
  • a stock solution of a polymer compound is generated (step S1).
  • the pigment fine particles to be dispersed in the polymer compound particles are added to the stock solution of the polymer compound and dispersed. Additives may be added according to the purpose.
  • the method for producing pigment fine particles include a build-up method.
  • the build-up method is a method for producing fine particles by producing solid-phase materials (raw materials) through reaction, supersaturation, nucleation, and growth from high-purity raw materials in the order of vapor, liquid atoms, molecules, and ions. is there. Industrially, it is a method used for the synthesis of high-purity fine particles having a particle size of several nm to several tens of nm.
  • Japanese Patent No. 3936558 can be referred to as a reference.
  • the stock solution of the polymer compound is emulsified (step S2). That is, the apparatus shown in FIG. 6 includes a container 10 and a stirrer 20. A stock solution of a polymer compound composed of unreacted monomers is contained in the container 10. A solvent for dispersing polymer compound particles such as water and a solvent is contained in the stirrer 20.
  • the pigment is dispersed in advance in the stock solution, fine particles of the pigment are dispersed in the polymer solution stock particles constituting the emulsion.
  • aggregation of pigment fine particles present in the stock solution of the polymer compound is suppressed by the viscosity of the stock solution. In this way, particles of a polymer compound stock solution in which pigment fine particles are uniformly dispersed inside can be formed in water.
  • the stock solution of the polymer compound is emulsified or suspended to produce a stock solution of ink (step S3).
  • the stock solution may be heated or emulsified or suspended by polymerization reaction of the stock solution to make it rubber (for example, using a cross-linking agent mixed in water).
  • the pigment fine particles in the polymer compound particle are fixed, and reaggregation is completely eliminated.
  • it is not essential to emulsion or suspend the stock solution of the polymer compound and the procedure may proceed to step S4 with the stock solution particles dispersed in water.
  • step S3 the ink stock solution obtained in step S3 is diluted to a desired concentration to obtain an ink having a desired concentration or viscosity (step S4).
  • an additive may be appropriately added to adjust the surface tension of the ink.
  • the binder resin particles 1 are dispersed in the dispersion solution 3 as a dispersoid, and the colorant 2 is dispersed or dissolved in the binder resin particles 1. .
  • the surface area of the ink can easily be substantially spherical or oval even if the binder resin particles 1 in which the colorant 2 is dispersed or dissolved are enlarged.
  • the lyophilicity between the resin itself and the dispersion solvent 3 by surface treatment or encapsulation, it is possible to ensure ejection stability without being affected by the nonuniformity caused by the colorant 2. Can do. That is, by increasing the size of the binder resin particles 1 encapsulating the colorant 2 contained in the ink, ink bleeding on the medium 4 can be prevented while maintaining ink ejection stability without being affected by the colorant 2. It is possible to prevent.
  • the average particle diameter of the binder resin particles 1 is 50 nm or more.
  • the ejection stability can be ensured, so that the ink bleeding on the medium 4 and the binder resin particles are ensured while ensuring the ejection stability. 1 aggregation and colorant 2 alteration can be further prevented.
  • the average particle diameter of the binder resin particles 1 is 80 nm or more.
  • the ejection stability can be ensured, so that the ink bleeding on the medium 4 and the binder resin particles are ensured while ensuring the ejection stability. 1 aggregation and colorant 2 alteration can be further prevented.
  • the binder resin particles 1 are formed by emulsion polymerization or suspension polymerization of a binder resin material monomer and the colorant.
  • the binder resin particles 1 can be easily formed into a substantially spherical shape or a substantially elliptical shape, so that the discharge stability is ensured even when the binder resin particles 1 are enlarged in diameter.
  • the average content ratio of the binder resin and the colorant 2 in the binder resin particles 1 is 20:80 to 95: 5 in weight ratio.
  • the binder resin particles 1 have a substantially spherical shape, a substantially elliptical shape, or a substantially disk shape.
  • the average particle diameter of the colorant 2 is 50 nm or less.
  • the colorability of the ink is further improved, and high-definition printing is possible.
  • the colorant is included in the particles of the binder resin, the light resistance of the ink can be improved even if the average particle diameter of the colorant is reduced to 50 nm or less.
  • the colorant 2 includes an organic pigment, an inorganic pigment, a disperse dye, an acid dye, a reactive dye, titanium oxide, magnetic particles, alumina, silica, ceramic, carbon black, metal nanoparticles, and an organic metal. And at least one selected from the group consisting of:
  • ink that can be used for various purposes can be provided.
  • the binder resin is at least one resin selected from a polymer compound that is cured by light or heat or is cured.
  • ink that can be used for various purposes can be provided.
  • the binder resin is an ultraviolet curable polymer compound.
  • the main component of the dispersion solution 3 is at least one of water and a hydrophilic solvent
  • the binder resin particles 1 are emulsion or suspended in at least one of the water and the hydrophilic solvent.
  • the main component of the dispersion solution 3 is at least one of water and a hydrophilic solvent, and the surface of the binder resin particles 1 is subjected to a hydrophilic treatment.
  • the binder resin particle 1 since the surface of the binder resin particle 1 which touches water or a hydrophilic solvent has affinity with respect to water or a hydrophilic solvent, the binder resin particle 1 is disperse
  • the hydrophilization treatment is preferably an emulsification treatment for emulsifying the surface using a surfactant or a dispersant, or an introduction treatment for introducing a hydrophilic group into the surface.
  • the surface of binder resin can be suitably hydrophilized.
  • the surface of the binder resin particle 1 can be suitably hydrophilized.
  • the average particle size of the binder resin particles 1 is 800 nm or more.
  • the colorant 2 is a particle containing a rare earth metal.
  • the ink can be suitably used as so-called stealth ink.
  • an ink containing particles containing a rare earth metal as the stealth ink, the ink is more stable and a printed matter with high brightness can be obtained.
  • the particles containing rare earth metal are encapsulated in the binder resin particles 1, it is possible to prevent the ink from bleeding on the media 4.
  • an ink, fabric, leather, etc. Even on the medium 4 that is likely to bleed, printing can be performed without causing bleed without performing any pretreatment on the medium 4. That is, using the ink of the present invention as stealth ink, it can be suitably printed on fabric, leather, etc., and ink suitable for printing a mark for authenticity identification on fabric and leather products is used. Can be provided.
  • the ink according to the present invention it is preferable that a resin different from the binder resin is dissolved in the dispersion solution 3.
  • the viscosity of the ink can be adjusted. Further, when moisture in the ink flies by drying, the binder resin can be further strongly bonded as a binder when the other resin is formed into a film by bonding between the binder resins. Then, by using the other resin as a binder and binding the binder resins strongly, it is possible to prevent ink bleeding on the print medium.
  • the surface of the binder resin particle 1 is coated with a polymer or monomer surfactant.
  • the binder resin particles 1 are microencapsulated with the surfactant.
  • the colorant 2 may be exposed from the surface of the binder resin particles 1.
  • the ejection stability of the ink is lowered.
  • the surface of the binder resin particles 1 by coating the surface of the binder resin particles 1 with a surfactant, the dispersibility of the binder resin particles 1 in the dispersion solution 3 can be improved, and ink bleeding can be more effectively prevented. Further, by coating the surface of the binder resin particles 1 with a surfactant, the particle surface is strengthened, the light resistance and color development of the ink are improved, and a strong ink film can be formed on the medium 4.
  • the binder resin particles 1 include flat particles having at least one elliptical cross section.
  • the flat particles fall down so that the long axis, which is the longest diameter among the diameters passing through the center of gravity of the flat particles, is along the surface of the media 4. That is, in the ink layer formed on the medium 4, the flat particles are oriented so that their long axes are along the surface of the medium 4.
  • One embodiment of the inkjet recording method according to the present invention includes a discharge step of discharging the ink onto a print medium, and first heating that heats the ink that has landed on the print medium at a temperature at which the solvent in the dispersion solution is evaporated. Process.
  • printing can be suitably performed on various media 4.
  • the binder resin is a polymer compound that is cured by heat
  • the ink that has landed on the printing medium is dissolved in the binder resin after the first heating step.
  • a second heating step of heating at a temperature is further included.
  • the ink can be more firmly fixed on the medium 4.
  • the binder resin is a polymer compound that is cured by light
  • an irradiation step of irradiating the ink landed on the printing medium with light after the first heating step is performed.
  • the average particle diameter of the binder resin particles is 1/10 or less of the nozzle diameter of the nozzle that discharges the ink in the discharging step.
  • the discharge stability is further improved by the above configuration.
  • the printing medium is particularly effective when it is a non-absorbing medium such as plastic, paper, or fabric that is likely to cause bleeding.
  • the colorant 2 is included in the binder resin particles 1 in the ink, it is possible to prevent bleeding of the ink on the medium 4, and by using such an ink, Even on a medium 4 that is easy to bleed, such as non-absorbent media, paper, fabric, leather, etc., printing can be performed without causing bleed without performing any pretreatment on the medium 4.
  • one embodiment of the ink manufacturing method according to the present invention is not limited to a specific method, it is one of a binder resin liquid and a binder resin material liquid, and the colorant is It includes a step of putting the liquid that is dispersed or dissolved in a liquid that is incompatible with the liquid and stirring.
  • the ink according to the present invention can be preferably manufactured.
  • the present invention can be suitably used for inks such as dyes and coating agents.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
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  • Inks, Pencil-Leads, Or Crayons (AREA)
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Abstract

La présente invention concerne le problème de la prévention de l'agrégation et de la précipitation d'un colorant dans une encre et également de la prévention du maculage de l'encre sur un support d'impression, tout en maintenant également la stabilité d'éjection de l'encre. Sous la forme d'une solution, dans cette encre, des particules d'une résine liante sont dispersées dans une solution de dispersion en tant que dispersoïde, et un colorant est dispersé ou dissous dans les particules de la résine liante.
PCT/JP2013/051922 2012-02-01 2013-01-29 Encre et utilisation associée WO2013115190A1 (fr)

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WO2016027881A1 (fr) * 2014-08-21 2016-02-25 株式会社ミマキエンジニアリング Imprimante à jet d'encre, procédé d'impression de colorant et encre

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JP6289201B2 (ja) * 2014-03-26 2018-03-07 株式会社ミマキエンジニアリング 三次元造形物製造用インク及びその利用
JP2017087617A (ja) * 2015-11-12 2017-05-25 株式会社ミマキエンジニアリング 印刷装置及び印刷方法
JPWO2017146071A1 (ja) * 2016-02-26 2019-01-24 富士フイルム株式会社 インクジェット捺染方法、着色組成物、インクジェットインク、インクカートリッジ、及び染料ポリマー
JP2019199045A (ja) 2018-05-17 2019-11-21 株式会社ミマキエンジニアリング 印刷装置及び印刷方法
US11607838B2 (en) 2018-07-11 2023-03-21 Mimaki Engineering Co., Ltd. Liquid ejecting apparatus, liquid ejecting method, and ink
EP4032959A4 (fr) 2019-09-19 2023-10-25 DNP Fine Chemicals Co., Ltd. Dispersion, composition d'encre et article imprimé

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