WO2006013707A1 - インクジェット記録方法およびこれに用いるインクジェット記録用インク - Google Patents
インクジェット記録方法およびこれに用いるインクジェット記録用インク Download PDFInfo
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- WO2006013707A1 WO2006013707A1 PCT/JP2005/012930 JP2005012930W WO2006013707A1 WO 2006013707 A1 WO2006013707 A1 WO 2006013707A1 JP 2005012930 W JP2005012930 W JP 2005012930W WO 2006013707 A1 WO2006013707 A1 WO 2006013707A1
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- ink
- jet recording
- ink jet
- pigment
- recording method
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04516—Control methods or devices therefor, e.g. driver circuits, control circuits preventing formation of satellite drops
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04581—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on piezoelectric elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04588—Control methods or devices therefor, e.g. driver circuits, control circuits using a specific waveform
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
- B41J2202/01—Embodiments of or processes related to ink-jet heads
- B41J2202/10—Finger type piezoelectric elements
Definitions
- the present invention relates to an ink jet recording method using a relatively high viscosity ink, for example, an ink curable by ultraviolet rays, and is particularly excellent in ejection stability, can suppress generation of mist, and can output a high-definition image.
- ink jet recording ink hereinafter also simply referred to as ink
- ink jet nozzles ink jet nozzles
- Inks that use pigments, disperse dyes, metal particles, etc. as coloring materials, inks that change their physical properties before and after ejection, such as gelation and ultraviolet curing, and those that use highly safe solvents, etc. are beginning to be used.
- these highly functional inks generally tend to have poor discharge properties. This is mainly due to an increase in ink viscosity, an increase in thixotropic properties in the dispersion, and a decrease in surface tension, depending on the additive used to add functionality.
- recording heads are required to be further improved in droplet size, multi-gradation, increase in production volume, increase in the number of nozzles, ejection accuracy, durability to functional ink, reliability, etc. Is underway
- the combination of the above-described high viscosity / dispersion ink and small droplet size / high-frequency head has a problem in the system to ensure stable emission. Particularly when high-viscosity ink is ejected from a small-diameter nozzle at a high frequency, the problem is the frequent occurrence of satellites and the resulting recording. Mist floating without reaching the medium.
- the mist not only contaminates the recording medium but also adheres to the ink-jet nozzles, which impairs the stable light output and reduces the productivity. For example, it is necessary to increase the cleaning operation required for stable light emission. In addition, the equipment becomes complicated by providing a recovery mechanism. When the relative speed of the carriage and the medium is increased in order to improve productivity, there is a problem that the satellite is stalled under the influence of wind and mist is increased. This becomes significant when the main droplet size is reduced.
- the ink contains a hardly decomposable material, for example, a pigment, various hardly decomposable polymers, inorganic substances, metals, etc.
- a mist of several zm or less, particularly 1 ⁇ m or less is not preferable for the human body. This is because the fine particles penetrate deep into the alveoli and are not excreted.
- a method for suppressing mist a method of suppressing air turbulence due to a reciprocating movement of a carriage (see Patent Document 1), a method of sucking with an electrostatic member (see Patent Document 2), and a driving condition of a piezoelectric element are generated.
- Proposed methods include merging satellites into main droplets (see Patent Document 3), and merging multiple satellites before landing (see Patent Document 4)!
- Patent Document 1 Japanese Patent Laid-Open No. 2004-42580
- Patent Document 2 Japanese Patent Laid-Open No. 2003-237110
- Patent Document 3 Japanese Patent Publication No. 5-57913
- Patent Document 4 Japanese Patent Laid-Open No. 2002-144570
- the present invention provides an ink recording method and ink jet recording ink capable of recording high-viscosity ink in a small droplet, particularly a multi-drop driving system, with stable and suppressed generation of mist.
- the purpose is to obtain highly accurate images.
- One aspect of the present invention for achieving the above object is that, in an ink jet recording method in which 5 to 20 mPa's of ink is ejected from an ink jet nozzle onto a recording medium, the ejected ink droplets are The main droplet and satellite are formed, and recording is performed under the condition that the main droplet velocity force at the lmm point from the nozzle surface is mZs or more, and the distance between the main droplet and the last satellite at the lmm point is 00 ⁇ m or less.
- FIG. 1 is a cross-sectional view taken along an ink channel of a share mode type inkjet head.
- FIG. 2 is a cross-sectional view across an ink channel of a share mode ink jet head.
- FIG. 3 is a diagram showing a waveform of a drive pulse.
- FIG. 4 is a diagram showing an example in which the driving waveform in the multi-drop is the same, and an example in which the driving waveform of the final ink droplet is different from other ink droplets.
- FIG. 5 is a diagram showing a main configuration of an ultraviolet curable ink jet recording apparatus.
- the ejected ink droplet forms a main droplet and a satellite, and is at a point 1 mm from the nozzle surface.
- An ink jet recording method wherein recording is performed under a condition that the main droplet velocity is 5 mZs or more and the distance between the main droplet and the last satellite at the lmm point is 500 ⁇ m or less.
- the ink is a high-viscosity ink at 25 ° C. of lOmPa ′s or more, and the ink is recorded as 5 to 20 mPa ′s by heating (1) or ( The ink jet recording method described in item 2).
- the ink contains a pigment as a coloring material, and after coating the ink on a transparent substrate with a thickness of 3 ⁇ m, a coarse pigment of 1 m or more observed with a microscope has a 1000 m 2 field of view. 5.
- the inkjet recording method according to any one of (1) to (3), wherein there are 5 or less inks.
- Item (4) is characterized in that the pigment contains a polymer dispersant as a dispersant for the pigment, and the content of the polymer dispersant released from the pigment is 1% or less.
- a multi-drop driving system having a plurality of main droplets (1) to (
- Ink jet recording inks used in the ink jet recording method of the present invention include water-based inks mainly composed of water, oil-based and solvent-based inks mainly composed of organic solvents, and waxes. Any of solid inks that are used after being melted by heat, ultraviolet curable inks that are cured by ultraviolet rays, and the like may be used.
- an ultraviolet curable ink or a hot melt ink which is a solid or high viscosity liquid at normal temperature and has an ink viscosity of 5 to 20 mPa's when discharged by heating. be able to.
- the viscosity of the ink at the time of ejection of 5 to 20 mPa's means that the ink has a higher viscosity than the ink jet recording ink that is usually used.
- the main droplet velocity at a point lmm from the nozzle surface is 5 mZs or more means that the ejection velocity of the ink droplet is high.
- the ejected ink droplets are the main droplet and usually a large number of satellites (the speed of formation formed after the main droplet is slow, small! However, in the present invention, 10 or less satellites may be preferable.
- the present invention requires that the distance between the main droplet and the last satellite is 500 ⁇ m or less in the main droplet and satellite in which one ink droplet force is also formed. It has been found that actual damage caused by mist occurs when the distance is more than 00 m.
- the main point of the present invention is that the actual damage of mist in the actual machine is reduced as the length up to the last satellite, not the number of satellites, is shorter. If the distance between the main droplet and the last satellite exceeds 500 m, the satellite's size will decrease, and it will soon be stalled by the influence of the wind and may become a mist.
- the distance between the main droplet and the last satellite is more preferably 300 ⁇ m or less.
- the multi-drop driving method having a plurality of main drops defines an ink-jet nozzle that can apply a plurality of drops of ink to one pixel for multi-gradation.
- a pallet scale head is useful not only for printers that aim for photographic image quality, but also for UV curable ink jet recording systems that require a heavy load on the carriage, such as heavy light sources, and line recording systems that require a large number of nozzles.
- mist is particularly likely to occur.
- the mist can be improved by suppressing the distance to the last satellite in order to suppress the mist. Again, from the last main drop to the last satellite The distance is preferably 300 ⁇ m or less.
- the number of satellites is preferably 10 or less, more preferably 5 or less.
- the number of satellites is the number of satellites at which the last main droplet is observed at a distance of 1 mm from the nozzle surface, and in the case of multidrop, the rear satellite is absorbed by the next main droplet. Count.
- the viscosity (mPa's) is not particularly limited as long as it has been tested with a standard solution for viscometer calibration specified in JIS Z 8809.
- the shear rate is a viscosity value of 1000 s- 1 , and as a viscosity measuring device, a rotary, vibration or capillary type viscometer can be used, for example, Saybolt viscometer, Red wood viscometer, etc.
- Physica, MCR300, Tokimec, cone-plate E type viscometer, Toki Sangyo E Type Viscometer, Tokyo Keiki B type viscometer BL, mountain Examples include FVM-80A manufactured by Ichiki Electric Co., Vi scoliner manufactured by Nametore Industries, Ltd., VISCO MATE MODEL VM-1A manufactured by Yamaichi Electric Co., Ltd., DD-1 and the like.
- pigments include, for example, the following pigments.
- Can do. CI Pigment Yellow 1, 2, 3, 12, 13, 14, 16, 17, 73, 74, 75, 81, 83, 87, 93, 95, 97, 98, 109, 114, 120, 1 28, 129, 138, 139, 150, 151, 154, 180 CI Pigment Red 5, 7, 12, 22, 38, 48: 1, 48: 2, 48: 4, 49: 1, 53: 1, 57: 1, 63: 1, 101, 112, 122, 123, 1 44, 146, 168, 184, 185, 202 CI Pigment Violet 19, 23 CI Pigme nt Blue 1, 2, 3, 15: 1, 15: 2, 15: 3, 15: 4, 18, 22, 27, 29, 60 CI Pigm ent Green 7, 36 CI Pigment White 6, 18, 21 CI Pigment Black In the present invention, among the pigments described above, the
- synergists having a structure similar to that of the pigment and having been subjected to any of basic, acidic and polar treatments.
- Synergists have the same structure as pigments, and are modified with polar groups such as acidic groups and basic groups, or organic substances having organic pigment cores, and the polar groups are bonded directly or through a joint. And ask for something.
- the dispersibility of the pigment is improved by adsorbing it on the pigment surface and bonding it to the dispersant.
- Most of these synergists are inferior in light resistance, and excessive treatment cannot exhibit the light resistance of the original pigment.
- Examples of the polar group include a sulfonic acid group, a carboxylic acid group, a phosphoric acid group, a boric acid group, and a hydroxyl group, preferably a sulfonic acid group and a carboxylic acid group, and more preferably a sulfonic acid group.
- Examples of methods for obtaining pigment particles having a polar group on the surface include WO97Z4 8769, JP-A-10-110129, JP11-246807, JP11-57458, and JP11-189739. No. 11-323232, JP 2000-265094, etc., by treating the pigment particle surface with an appropriate oxidizing agent, at least a part of the pigment surface has a sulfonic acid group or a salt thereof.
- transducing a polar group is mentioned. Specifically, carbon black is acidified with concentrated nitric acid, and in the case of color pigments, it is acidified with sulfamic acid, sulfonated pyridine salt, amide sulfuric acid, etc.
- the pigment dispersion can be obtained by removing and purifying the substance that has been oxidized and becomes water-soluble.
- an acidic group may be neutralized with a basic compound as necessary.
- Other methods include JP-A-11-49974, JP-A-2000-273383, 2000.
- the polar group may be free or in a salt state, or may have a counter salt.
- counter monosalts include inorganic salts (lithium, sodium, potassium, magnesium, calcium, aluminum, nickel, ammonia), organic salts (triethyl ammonium, jetyl ammonium, pyridinium, trimethyl). Ethanol ammonium etc.), preferably a monovalent counter monosalt having a monovalent valence.
- the synergist is preferably one that has been acid-modified such as sulfonic acid modification or carboxyl group modification and has an amine value greater than the acid value.
- synergists are preferably added in an amount of 1 to 50 parts by mass with respect to 100 parts by mass of the pigment.
- a ball mill, sand mill, attritor, roll mill, agitator, Henschel mixer, colloid mill, ultrasonic homogenizer, pearl mill, wet jet mill, paint shaker, or the like can be used.
- the selection of the pigment, the dispersant, the dispersion medium, the dispersion conditions, and the filtration conditions are appropriately set so that the average particle diameter of the pigment particles is 80 to 150 nm.
- the average particle diameter can be measured by observing the pigment dispersion with a transmission electron microscope or using an optical method such as a laser scattering method.
- inkjet ink passes through a membrane filter, etc., and removes coarse particles.
- the ink passes through the filter with a certain probability, and the pigment re-aggregates due to the shape of the filter during filtration or due to aging. It is considered that pigment re-aggregation occurs.
- These coarse particles are few and difficult to observe with a particle size analyzer using light scattering.
- the ink for ink jet recording used in the present invention after coating on a transparent substrate with a thickness of 3 m, 5 coarse pigments of 1 m or more observed with a microscope are observed in a 1000 m 2 field of view. It is preferable that the number is 5 or less, so that the distance between the satellite and the main droplet and the number of satellites can be reduced. More preferably, it is 1 or less.
- the ink for inkjet recording of the present invention uses a polymerizable compound having a small polarity as a dispersion medium or a pigment is used as a coloring material
- a polymer dispersant is used to ensure the dispersion stability of the pigment. Is preferred to use.
- the polymer dispersant is preferably one having a base or an acid as an adsorption site for the pigment. Good results are obtained with either base 'acid.
- Polymer modified polyurethane, modified polyacrylate, polyether ester type cation activator, naphthalene sulfonic acid formalin condensate salt, aromatic sulfonic acid formalin condensate salt, polyoxyethylene alkyl phosphate ester, polyoxyethylene uref
- examples thereof include ether, stearylamine acetate, and pigment derivatives.
- the dynamic viscosity will be high even at a high shear rate at which the ink is ejected from the nozzle. This is effective in increasing the distance from the main droplet to the satellite without lowering the emission, which is thought to reduce the emission stability.
- Main droplet force The effect of increasing the distance to the satellite is synergistically expressed by the coexistence of solid particles such as pigments and polymer components. There are no solid particles! With ink, the distance to the satellite is unlikely to be long.
- the particle size of the solid particles is preferably 80 to 150 nm as described in the section of pigment dispersion.
- the average particle size is larger than 150, the effect of increasing the distance to the satellite is emphasized.
- High dynamic viscosity of the ink makes it easy to generate satellites in addition to the main droplets. Therefore, frequent mists, nozzle contamination due to mists, increased power of missing nozzles! ], The emission accuracy is reduced.
- the excess dispersant causes non-uniformity of ink at the time of curing, and tends to cause curing.
- the released polymer dispersant can be quantified in excess by collecting and analyzing the transparent portion excluding the pigment by means of ultracentrifugation, filtration, chromatography, and the like. I can do it.
- the polymer dispersant As the polymer dispersant, those adsorbed on the pigment surface by an acid-base reaction are preferable.
- the polymer dispersant is quantified by measuring the acid value or amine value of the ink extracted as described above. can do.
- the acid value and amine value can be determined by potentiometric titration. For example, it can be measured by the method described in Journal of Color Material Association 61, [12] 692-698 (1988). When a plurality of pigments and dispersants are used, they can be used as their mass average.
- viscosity measurement and various spectroscopic measurements can be applied.
- separation and quantification can be performed using liquid chromatography, GPC (gel permeation mouth matography) and the like.
- the excess polymer dispersant can drastically improve the mist by setting it to 1.0% by mass or less, particularly preferably 0.5% by mass or less, with respect to the whole ink.
- examples of the radical polymerizable compound include, for example, JP-A-7-159983, JP-B-7-31399, JP-A-8-224982, 1
- Examples thereof include epoxy compounds, burether compounds, oxetane compounds and the like, which are exemplified in publications such as 001-310938, 2001-310937, and 2001-220526.
- the radical polymerizable compound is a compound having an ethylenically unsaturated bond capable of radical polymerization, and any compound having at least one ethylenically unsaturated bond capable of radical polymerization in the molecule. Those having a chemical form such as monomer, oligomer, polymer, etc. are also included. Only one kind of radically polymerizable compound may be used, or two or more kinds may be used in combination at an arbitrary ratio in order to improve the desired properties.
- Examples of compounds having a radically polymerizable ethylenically unsaturated bond include unsaturated carboxylic acids such as acrylic acid, metataric acid, itaconic acid, crotonic acid, isocrotonic acid, maleic acid, and the like.
- Examples thereof include radically polymerizable compounds such as salts, esters, urethanes, amide anhydrides, acrylonitrile, styrene, various unsaturated polyesters, unsaturated polyethers, unsaturated polyamides, and unsaturated urethanes.
- the addition amount of the radical polymerizable compound is preferably 1 to 97% by mass, more preferably 30 to 95% by mass, based on the ink composition.
- the cationically polymerizable ink preferably contains at least one oxetane compound and at least one compound selected from an epoxy compound and a bull ether compound.
- epoxy compounds aromatic epoxy compounds and alicyclic epoxy compounds are preferred, and alicyclic epoxy compounds are particularly preferred in consideration of rapid curing.
- one of the above epoxides may be used alone, or two or more may be used in appropriate combination.
- vinyl ether compounds di- or trivinyl ether compounds are preferred in view of curability, adhesion and surface hardness, and divinyl ether compounds are particularly preferred.
- one of the above butyl ether compounds may be used alone, or two or more may be used in appropriate combination.
- An oxetane compound is a compound having an oxetane ring, and any known oxetane compound as disclosed in JP 2001-220526, JP 2001-310937, and the like. You can use things. If a compound having 5 or more oxetane rings is used in the oxetane compound, the viscosity of the ink composition increases, making it difficult to handle and increasing the glass transition temperature of the ink composition. The resulting cured product will not be sufficiently sticky.
- the oxetane compound is preferably a compound having 1 to 4 oxetane rings.
- a photopolymerization initiator is added and cured.
- the photopolymerization initiator is a radical generator when a radical polymerizable compound is used as the polymerizable compound, and is used when a cationic polymerizable compound is used as the polymerizable compound. It is a photoacid generator. Radical generators can be broadly classified into two types: intramolecular bond cleavage type and intramolecular hydrogen abstraction type.
- Examples of the intramolecular bond cleavage type radical generator include diethoxyacetophenone, 2 -Hydroxy-2-methyl-1-phenylpropane 1-one, benzyldimethyl ketal, 1- (4-isopropylphenol) 2 Hydroxy-2-methylpropane-1-one, 4-(2 Hydroxyethoxy) phenol (2 1-Hydroxycyclohexyl-phenylketone, 2-acetophenones such as 2-methyl-2-morpholino (4-thiomethylphenol) propane-1-one; 2-benzyl-2-dimethylamino 1— ⁇ -amino ketones such as (4-morpholinophenol) monobutanone; benzoins such as benzoin, benzoin methyl ether, and benzoin isopropyl ether; bis (2, 4, 6 trimethylbenzoyl) phenol phosphine Bisacylphosphine oxides such as oxide; benzyl-methylphenol glyoxyester And the
- examples of the intramolecular hydrogen abstraction type radical generator include, for example, benzophenone, ⁇ -methyl benzoylbenzoate-4-phenol-penzophenone, 4, 4'-dichroic benzophenone, hydroxybenzophenone, 4- Benzyl 4'—methyl-diphenyl sulfide, acrylated benzophenone, 3, 3 ', 4, 4'-tetra (t-butylperoxycarbol) benzophenone, 3, 3'-dimethyl-1,4-methoxybenzophenone, etc.
- the blending amount is preferably 0.01 to L0.00 mass% of the ultraviolet curable ink.
- bisacylphosphine oxide having photobleaching properties and ⁇ -aminoketone which is not easily affected by oxygen inhibition are particularly preferred because they have a high effect of increasing sensitivity in small droplets.
- bisacylphosphine oxide and a aminoketone for example, Irgacure series of Ciba Specialty Chemicals can be used.
- the initiator is added in a larger amount than usual, resulting in decomposition of the photopolymerization initiator.
- a photopolymerization initiator containing a hydroxyethoxy group is preferred because it has a small degradation product odor.
- Irgacure2 from Ciba Specialty Chemicals 959 has a low degradation product odor.
- the photoacid generator for example, a chemical amplification type photoresist or a compound used for photo-power thione polymerization is used (edited by Organic Electronics Materials Research Group, “Organic Materials for Imaging”, Bunshin Publishing ( 1993), pages 187-192). Examples of compounds suitable for the present invention are listed below.
- B (CF)-, PF-, AsF-, SbF-, CF SO-- of aromatic onium compounds such as diazoum, ammonia, jordanum, snorehonum, phospho- um, etc. Salting
- Photopolymerization initiators preferably used in the present invention are described in JP-A Nos. 2003-213184, 2003-306622, 2003-342499, 2003-252979, and 2003 253155. The compound of this is mentioned.
- a polymerization inhibitor that suppresses polymerization by heat or actinic rays can be added to the ink.
- the polymerization inhibitor various compounds are known, and those widely blended in general polymerizable compositions can be used as they are.
- Polymerization inhibitors include phenolic acid antioxidants, amine compounds, phosphorus antioxidants, hydroquinone monomethyl ether widely used for (meth) acrylic monomers, hydroquinone, tbutylcatechol, Pyrogallol, water, etc. can be used. These are detailed in “Development Technology of Polymer Additives” (issued by CMC). Phenolic compounds with double bonds derived from acrylic acid in the molecule can capture R 'from the reaction mechanism, so that they can suppress polymerization even when heated in a system without sealed oxygen. Is preferable. Specific examples include Sumilizer GA-80, Sumilizer GM and Sumilizer GS manufactured by Sumitomo Chemical.
- polymerization inhibitors are preferably added at the time of preparation of the pigment dispersion.
- excessive addition of the polymerization inhibitor causes a decrease in sensitivity as an ink, and therefore, storage stability as an ink is stable.
- the amount is set appropriately so as to prevent polymerization during pigment dispersion while maintaining the properties.
- the polymerization inhibitor is preferably an amine compound. Amine compounds can synergistically maintain a balance between preservation and sensitivity in combination with a dispersant having an acid value higher than the amine value.
- quaternary ammonium salts are particularly preferred for cationically polymerizable inks because they can suppress dark reactions during storage without suppressing reactions during exposure.
- a tertiary amine having a small polarity is a particularly preferred polymerization inhibitor.
- the added amount of the amine compound is preferably 0.01 to 1% by mass of the total ink. If it is less than 01% by mass, storage stability cannot be obtained. When it is larger than 1% by mass, the curing sensitivity is lowered.
- the ink of the present invention is cured by irradiation with ultraviolet rays, but a photosensitizer can be used in combination in order to perform the curing reaction more efficiently.
- photosensitizers include triethanolamine, methyljetanolamine, triisopropanolamine, methyl 4-dimethylaminobenzoate, ethyl 4-dimethylaminobenzoate, isoamyl 4-dimethylaminobenzoate, and benzoate.
- Amines such as acid (2 dimethylamino) ethyl, 4-dimethylaminobenzoic acid (n-butoxy) ethyl, 2 dimethylaminobenzoic acid 2-ethylhexyl, cyanine, phthalocyanine, merocyanine, porphyrin, spiro compound, ferrocene, fluorene, fulgide, imidazole , Perylene, phenazine, phenothiazine, polyene, azo compound, diphenol methane, triphenyl methane, polymethine atalidine, coumarin, ketocoumarin, quinacridone, indigo, styryl, pyrylium compound Examples include pyromethene compounds, pyrazolotriazole compounds, benzothiazole compounds, barbituric acid derivatives, thiobarbituric acid derivatives, and the like, as well as European Patent No.
- JP-A-5,227,227, JP-A-2001-125255, JP-A-11-271969 and the like can also be used.
- the cationic photosensitizer known ones are used, and specifically, anthracene, pyrene, perylene, atalidine orange, thixanthone, 2-clothiothixanthone, benzoflavine, eosin, rose bengal, and erythrice. There are Mouth Shin and Methylene Blue.
- the amount of photosensitizer used is preferably in the range of 0.01-10.00% by mass in the ink composition.
- the ink of the present invention preferably contains a surfactant.
- a surfactant Any of cationic, anionic, amphoteric, and nonionic can be used, but nonionic surfactants are particularly preferred!
- nonionic surfactants include polyoxyethylene alkyl ether, polyoxyethylene secondary alcohol ether, polyoxyethylene alkyl ether (eg, Emulgen 911), polyoxyethylene sterol ether, polyoxyethylene lanolin.
- polyoxyethylene polyoxypropylene alkyl ether for example, Newpol PE-62
- polyoxyethylene glycerin fatty acid ester polyoxyethylene castor oil, hydrogenated castor oil
- polyoxyethylene sorbitan fatty acid ester polyoxyethylene sorbitol fatty acid ester
- polyethylene Glycol fatty acid ester fatty acid monoglyceride
- polyglycerin fatty acid ester sorbitan fatty acid ester
- propylenicol fatty acid ester examples include sucrose fatty acid esters, fatty acid alkanolamides, polyoxyethylene fatty acid amides, polyoxyethylene alkylamines, alkylamine oxides, acetylene glycols, and acety
- a fluorine-based surfactant having a perfluoroalkyl group in the molecule of the non-ionic surfactant is particularly preferred.
- the fluorosurfactant having a perfluoroalkyl group in the molecule include perfluoroalkylethylene oxide-containing compounds, perfluoroalkylamine oxides, perfluoroalkyl-containing oligomers, and materials. For example, “Surflon (311!« ⁇ 0?
- surfactants When these surfactants are used, they can be used alone or in admixture of two or more, and by adding in the range of 0.001 to 1.0% by mass with respect to the total amount of ink, Inn The surface tension of the tape can be adjusted arbitrarily. However, the present invention is not limited to these. In order to maintain the long-term storage stability of the ink, preservatives and fungicides can be added to the ink.
- the mist tends to be a problem because the ink dispersion has a high pigment viscosity specification.
- UV curable inks are particularly required to reduce mist, which is often harmful to humans such as irritation and sensitization.
- Examples of the base material include paper, paper laminated with plastics (for example, polyethylene, polypropylene, polystyrene, salt cellulose), aluminum (including aluminum alloy), metal such as zinc, iron, and copper.
- a board etc. can be used.
- an ink jet recording paper in which a porous ink receiving layer is provided on a substrate called an ink jet recording paper can also be used.
- an electric-mechanical conversion method single cavity type, double cavity type, bender type, piston type, shear mode type, shear wall type, etc.
- electric Any discharge method such as a thermal conversion method (thermal ink jet type, bubble jet (registered trademark) type, etc.) may be used, but preferably a head using a piezo method is preferred, especially a share mode method. It is preferable because stable discharge can be performed over a long period of time.
- 1 is an ink tube
- 2 is a nozzle plate
- 3 is a nozzle
- 4 is an ink meniscus formed by ink
- S is a side wall as an electrical mechanical conversion means
- 6 is a cover plate
- 7 is an ink supply Mouth 8 is a substrate.
- FIG. 1 shows a cross-sectional view of one ink channel having one nozzle.
- the cover plate 6 and the base plate 8 are separated by a plurality of side walls S, that is, Sl, S2 '' Sn + 1, and the ink channels as the ink flow paths are odd rows A1, A3, ... and the air channels are even numbers In rows A2, A4, Are alternately formed.
- each ink channel is connected to a nozzle 3 formed in the nozzle plate 2, and the other end is connected to an ink tank via a supply port 7 and is illustrated by an ink tube 1, and is connected to the nozzle.
- An ink meniscus 4 is formed on the ink 3.
- electrodes Ql and Q2 formed in close contact with the side wall S1 and electrodes Q3 and Q4 formed in close contact with the side wall S2 are provided.
- electrodes are formed in close contact with each side wall.
- the electrode Q1 is connected to the ground, and the first pulse P of the positive voltage at the peak value VI, as shown in FIG. 3 (a), is connected to the electrode Q2. 2nd negative voltage with peak value V2 and width R
- P has the same absolute value of voltage VI and V2. Similarly, connect electrode Q4 to ground and connect electrode Q3.
- the side walls Sl, S2, ... are the side walls Sla, S2a, ... and Slb, S2b, ... that are composed of two piezoelectric materials with different polarization directions as indicated by the arrows in Fig. 2 (a).
- An actuator that is deformed and operated by applying a drive pulse. When no drive pulse is applied to the electrodes Q2 and Q3, the sidewalls Sl and S2 are not deformed as shown in Fig. 2 (a), but when the first pulse P is applied to the electrodes Q2 and Q3, the polarization direction of the piezoelectric material is changed.
- ⁇ An actuator that is deformed and operated by applying a drive pulse.
- each ink channel operates by applying a drive pulse to eject ink droplets.
- the applied drive voltage is low, the ink droplet speed is slow (for example, less than 5 m / sec), the length of the ink liquid column is short, and the number of generated satellites can be reduced. position The system gets worse.
- the drive voltage is high, the ink droplet speed increases (for example, lOm / sec or more), and the landing position system increases, but the liquid column length increases, the number of satellites increases, and the satellite length increases. It spreads. Therefore, it is necessary to adjust the drive voltage to an appropriate value that moderately increases the droplet velocity (5 m / s or more), and suppresses the length of the liquid column with high landing accuracy.
- FIG. 4 shows an example of drive waveforms in the case of single force and multidrop.
- the initial force is the same as the discharge waveform until the end.
- the ink restriction means that the number of ink droplets emitted from the inkjet nozzles is limited, that is, the emission is intermittently stopped, so that the satellite is greatly improved. Mist generation is greatly improved. This is particularly effective in the multi-drop method. By limiting the ink in this way, even if the carriage is driven at high speed, the actual damage caused by mist can be greatly reduced.
- An ink jet recording apparatus (hereinafter also simply referred to as a recording apparatus) using an ultraviolet curable ink that can be used in the present invention will be described.
- FIG. 5 shows an ink jet recording apparatus using ultraviolet curable ink.
- the recording device 51 includes a head carriage 52, a recording head 53, an irradiation unit 54, a platen unit 55, and the like.
- a platen unit 55 is installed under the base material M.
- the platen section 55 has a function of absorbing ultraviolet rays and absorbs excess ultraviolet rays that have passed through the base material M. As a result, a high-definition image can be stably reproduced.
- the base material M is guided by the guide member 56, and the operation of the conveying means (not shown) causes the base material M in FIG.
- the front force that moves is also moved in the back direction.
- the head scanning means (not shown) scans the recording head 53 held by the head carriage 52 by reciprocating the head carriage 52 in the Y direction in FIG.
- the head carriage 52 is installed on the upper side of the base material M, and stores a plurality of recording heads 53 to be described later and nozzles arranged on the lower side according to the number of colors used for image printing on the base material M. .
- the head carriage 52 is installed with respect to the main body of the recording apparatus 51 in such a manner that it can reciprocate in the Y direction in FIG. 5, and reciprocates in the Y direction in FIG. 5 by driving the head scanning means.
- the head carriage 52 accommodates the print head 53 of yellow (Y), magenta (M), cyan (C), black (K), and white (W).
- Y yellow
- M magenta
- C cyan
- K black
- W white
- the number of colors of the recording head 53 accommodated in the head carriage 52 is determined as appropriate.
- White (W) recording heads can also be provided on both sides of yellow ( ⁇ ), magenta ( ⁇ ), cyan (C), and black ( ⁇ ⁇ ⁇ ⁇ ) recording heads.
- the recording head 53 is an ultraviolet curable ink supplied by an ink supply means (not shown).
- the operation of the injection means (not shown) provided in the inside (abbreviated as UV ink) causes the injection roller to be injected toward the base plate.
- the UV ink ejected by the recording head 53 is composed of a coloring material, a photopolymerizable monomer, a photopolymerization initiator, etc., and the photopolymerization initiator acts as a catalyst when irradiated with ultraviolet rays. It has the property of being cured by the accompanying crosslinking and polymerization reaction of monomers.
- UV ink is ejected as ink droplets to (landing possible area), and ink droplets are landed on the landing possible area.
- Two colored UV inks (Y, M, C, K) and white ink (W) are alternately emitted to create a colored image and a white image, and the light irradiation process is repeated multiple times for each emission. I prefer to complete the image.
- the substrate M is appropriately moved from the front to the back in Fig. 5 by the conveying means, and again by the head scanning means. While scanning, the recording head 53 can Inject the UV ink to the next landable area adjacent in the back direction in Fig. 5.
- UV ink is ejected from the recording head 3 in conjunction with the head scanning means and the conveyance means, thereby forming an image that is a collection of UV ink droplets on the substrate M. Is done.
- the irradiation means 54 includes an ultraviolet lamp that emits ultraviolet light in a specific wavelength region with stable exposure energy and a filter that transmits ultraviolet light of a specific wavelength.
- an ultraviolet lamp that emits ultraviolet light in a specific wavelength region with stable exposure energy and a filter that transmits ultraviolet light of a specific wavelength.
- the ultraviolet lamp a mercury lamp, methanolenolide lamp, excimer laser, ultraviolet laser, hot cathode tube, cold cathode tube, black light, LED (light emitting diode), etc. can be applied.
- Ride lamps, cold cathode tubes, mercury lamps or black light are preferred.
- the irradiating means 54 is substantially the largest one that can be set by the recording apparatus (UV inkjet printer) 51 among the landable areas where the recording head 53 ejects UV ink by one scan by driving the head scanning means. Have the same shape or larger than the landable area
- the irradiation means 54 is fixed on both sides of the head carriage 52 so as to be substantially parallel to the base material M.
- the entire recording head 53 is of course shielded from light, but in addition, the distance hi between the irradiation means 54 and the substrate M, and the ink ejection part of the recording head 53 It is effective to reduce the distance h2 between 58 and the base material M (2 mm or less, preferably 1.5 mm or less) or to increase the distance d between the recording head 53 and the irradiation means 54 (d is increased). is there. Further, it is more preferable that a bellows structure 57 is provided between the recording head 53 and the irradiation means 54.
- the wavelength of the ultraviolet rays irradiated by the irradiation unit 54 can be changed as appropriate by replacing the ultraviolet lamp or filter provided in the irradiation unit 54.
- a heating means there is a method using a heat plate that guides conveyance of the substrate and generates heat. Heat is transmitted to the base material from a heat plate that guides and conveys the preferred base material, and the ink jet ink landed by this heat is heated.
- the heating means is hot air blowing means for blowing hot air onto the ink-jet ink landed on the substrate.
- the heating temperature of the ink jet ink landed on the substrate is preferably 30 to 60 ° C. If the heating temperature is less than 30 ° C, the landed ink is cured depending on the environmental humidity. If the temperature exceeds 60 ° C, the film substrate will shrink and wrinkle, which is preferable.
- Inks having the compositions described in Table 1 below were prepared by a conventional method.
- the pigment, dispersant, and polymerizable compound were dispersed in a bead mill for 2 hours, and then a photopolymerization initiator, a surfactant, and an amine compound were added, mixed, and filtered to obtain an ink. All of these inks are cationically polymerizable.
- the compounds used are shown below.
- PY138 C. I. Pigment Yellowl38 surface basic treatment product
- PR19 C. I. Pigment Redl9 surface basic treatment
- PBk7 C. I. Pigment Black7 surface acid-treated product
- PB822 Ajinomoto Fine Techno Co., Ltd., Ajisper PB822 (Polymer dispersant, acid value 18.5, value 15.9)
- OXT221 Toa Gosei Co., Ltd., Alonoxetane OXT221 (polymerizable compound) C2021P: Daicel Corporation, Celoxide 2021P (polymerizable compound)
- TIPA Triisopropanolamine (Amine compound)
- the numerical value of each composition represents the mass part in each ink.
- Coarse particles The ink was applied on a transparent PET film to a thickness of 3 m, and the number of coarse pigments of 1 m or more visible in an lm m 2 visual field was examined with an optical microscope.
- Amount of free dispersant quantified by LC MS
- the nozzle pitch was 360 dpi (dpi represents the number of dots per 2.54 cm), and a piezo head capable of emitting 3 droplets of 4 pl per droplet to one pixel was used.
- Step charts for each color were output using the three-time interleaving method (6 passes), and the image quality was evaluated.
- the base material was Fupo Corporation FGS, and the base material was emitted while being heated to 40 ° C, and the image was fixed by ultraviolet exposure.
- a low pressure mercury lamp with a wavelength of 254 nm was used as the light source.
- Table 3 shows the carriage speed of the inkjet head and the ink limit (liquid droplet number ratio) per color (one head).
- the mist contamination adhering to the non-image area beside the solid area was visually evaluated in three stages, ⁇ , ⁇ , and X. ⁇ indicates good, ⁇ indicates acceptable level, and X indicates not acceptable.
- the graininess in the halftone from noh and illite was visually evaluated in three stages: ⁇ , ⁇ , and X. ⁇ indicates good, ⁇ indicates acceptable level, and X indicates not acceptable.
- the main droplet velocity at a point of lmm from the nozzle surface is 5 mZs or more in comparison with the ink jet recording method using a relatively high viscosity ink of 5 to 20 mPa's.
- the distance between the main droplet and the last satellite at the lmm point is 500 m or less, it is possible to provide excellent ejection stability, suppress mist generation, and output a high-definition image. It was.
Landscapes
- Inks, Pencil-Leads, Or Crayons (AREA)
- Ink Jet Recording Methods And Recording Media Thereof (AREA)
- Ink Jet (AREA)
Abstract
Description
Claims
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JP2006531354A JPWO2006013707A1 (ja) | 2004-08-04 | 2005-07-13 | インクジェット記録方法およびこれに用いるインクジェット記録用インク |
EP05765775A EP1775127B1 (en) | 2004-08-04 | 2005-07-13 | Ink-jet recording method |
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US (1) | US7434899B2 (ja) |
EP (1) | EP1775127B1 (ja) |
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JP2006274052A (ja) * | 2005-03-29 | 2006-10-12 | Fuji Photo Film Co Ltd | インク組成物、インクジェット記録方法、及び印刷物 |
JP2008260820A (ja) * | 2007-04-11 | 2008-10-30 | Konica Minolta Holdings Inc | 水系加熱定着型インク及び加熱定着型インクジェット記録方法 |
JP2010284833A (ja) * | 2009-06-10 | 2010-12-24 | Riso Kagaku Corp | インクジェット方式画像形成装置 |
JP2011016347A (ja) * | 2009-06-12 | 2011-01-27 | Seiko Epson Corp | 液体吐出装置、及び、液体吐出装置の制御方法 |
JP2012144639A (ja) * | 2011-01-12 | 2012-08-02 | Riso Kagaku Corp | 油性インク及びインクジェット印刷法 |
US8764170B2 (en) | 2007-02-09 | 2014-07-01 | Konica Minolta Medical & Graphic, Inc. | Ink-jet head, ink-jet printer, and ink-jet recording method |
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US20130178726A1 (en) * | 2012-01-05 | 2013-07-11 | Medtronic Minimed, Inc. | Stabilized polymers for use with analyte sensors and methods for making and using them |
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Also Published As
Publication number | Publication date |
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EP1775127B1 (en) | 2012-01-25 |
US20060028497A1 (en) | 2006-02-09 |
EP1775127A1 (en) | 2007-04-18 |
EP1775127A4 (en) | 2010-03-24 |
JPWO2006013707A1 (ja) | 2008-05-01 |
US7434899B2 (en) | 2008-10-14 |
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