Classifications

• • 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
• • 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
• • 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
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
  • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]

Definitions

• the present invention is an ink jet recording ink excellent in glossiness and color reproducibility, and excellent in ejection stability and clogging recovery properties, even on various recording media, particularly glossy paper based on photographic paper.
• the present invention relates to a composition and an ink jet recording method using the ink composition.
• the ink jet recording method is a printing method in which printing is performed by causing ink droplets to fly and adhere to a recording medium such as paper. Due to recent advances in inkjet recording technology, inkjet recording methods are now being used in the field of high-definition printing, which has been realized only by silver halide photography and offset printing. Along with this, high-gloss recording media comparable to photographic paper and art paper used in the field of silver salt photography offset printing, so-called special paper, is used for inkjet recording, and is comparable to silver salt photography. Ink for inkjet recording has been developed that can realize glossy images. Ink-jet recording inks have been developed that can achieve image quality comparable to silver halide photographs even when plain paper is used.
• a water-based ink containing water as a main component and containing a colorant and various additives is generally used.
• a colorant pigments are superior to dyes in terms of weather resistance such as light resistance, gas resistance, water resistance, and moisture resistance, and therefore pigment-based inks that make use of the properties of pigments are being developed.
• a polysiloxane compound is used as a surfactant, and an alkanediol such as 1,2 hexanediol is added to the ink as a solubilizing agent.
• JP-A-2001-0172905 and JP-A-2003-12583 disclose 1,2-hexanediol, which is a water-soluble alkanediol, and water-soluble alkanediol having hydroxyl groups at both ends of the main chain. Some 1, 5 pentanediol is added to the ink, and it does not bleed against plain paper Less ink is disclosed.
• the present inventors have recently added various specific types of alkanediols and polyorganosiloxane compounds as surfactants in combination to various recording media, Especially for glossy paper based on photographic paper, it is possible to realize an ink composition that is excellent in glossiness, clogging recovery and handling of recorded materials, and excellent in ejection stability and color reproducibility. And gained knowledge.
• the present invention is based on strong knowledge.
• “handling of recorded matter” means that when the recorded matter is stored in a frame such as a glass plate or an acrylic plate, the ink solvent that separates from the recorded matter does not adhere to the frame.
• the object of the present invention is to provide excellent gloss, various clogging media, and particularly good clogging recovery and handling of recorded matter even on glossy paper based on photographic paper.
• An object is to provide an ink composition having excellent stability and color reproducibility.
• the ink composition for ink jet recording comprises an ink composition for ink jet recording comprising at least a colorant, water, an alcohol diol, and a surfactant.
• the alkanediol power comprising water-soluble 1,2-alkanediol and water-soluble alkanediol having hydroxyl groups at both ends of the main chain,
• the surfactant is a polyorganosiloxane.
• various recording media are excellent in glossiness, have good clogging recovery properties and handleability of recorded matter, and have excellent discharge stability and color.
• An ink composition having excellent reproducibility can be realized.
• the ink composition for ink jet recording according to the present invention contains a colorant, water, an alkanediol, and a surfactant as essential components.
• a colorant water, an alkanediol, and a surfactant as essential components.
• an alkanediol a water-soluble 1,2- Two types of alkanediols, alkanediols and water-soluble alkanediols having hydroxyl groups at both ends of the main chain, are used, and polyorganosiloxane is used as the surfactant.
• an alkanediol a water-soluble 1,2- Two types of alkanediols, alkanediols and water-soluble alkanediols having hydroxyl groups at both ends of the main chain, are used, and polyorganosiloxane is used as the surfactant.
• each component will be described.
• the alkanediol used in the ink composition for ink jet recording according to the present invention includes at least two types of alkanes: a water-soluble 1,2-alkanediol and a water-soluble alkanediol having hydroxyl groups at both ends of the main chain. Contains a diol.
• these two types of specific alkanediols together with the surfactants described below they are excellent in the absorption of ink solvents, such as photographic paper-based porous glossy paper. Even in a recorded matter in which the ink may come off, it is excellent in glossiness and clogging, and can prevent the ink solvent from being peeled off due to the strength of the recorded matter.
• the sharpness of the edge of the character is improved, so that it can be suitably used for printed matter such as a contract with a small font. The reason for this is not clear, but can be considered as follows.
• highly penetrating inks used in conventional ink jet recording include 1,2 hexanediol and 4 methyl 1,2-pentanediol in order to improve glossiness by reducing surface tension.
• adding only water-soluble 1,2-alkanediol such as 1,2-hexanediol the surface tension is extremely low. In order to lower it, a large amount of addition is required.
• the surface tension of a 15 wt% aqueous solution of 1,2-hexanediol or 4-methyl-1,2-pentanediol is 25 to 26 mN / m.
• the water-soluble 1,2-alkanediol has an effect on the surface tension.
• Ink droplets used in ink jet recording by improving the glossiness and adjusting the surface tension at each frequency with a water-soluble diol having hydroxyl groups at both ends of the main chain. Can be adapted to the output frequency. Since it can be adjusted in this way, it is possible to improve the discharge weight accuracy and the ink droplet landing accuracy on the recorded matter.
• 1,2-alkanediol having 5 or 6 carbon atoms which may have a branch is preferred as water-soluble 1,2-alkanediol.
• 1,2-hexanediol and Z or 4-methyl-1,2-pentanediol is particularly preferable to use 1,2-hexanediol and Z or 4-methyl-1,2-pentanediol.
• the water-soluble 1,2-alkanediol is preferably contained in an amount of 3 to 15% by weight, more preferably 6 to 15% by weight, based on the entire ink composition. By setting it within this range, it is possible to suppress a decrease and / or fluctuation in ink viscosity at low temperatures and high temperatures, and stable ejection.
• water-soluble alkanediol having hydroxyl groups at both ends of the main chain it is preferable to use those having an alkanediol having 3 to 10 carbon atoms which may have a branch 1 1,3 propanediol, 1,4 butanediol, 1,5 pentanediol, 1,6-hexanediol and the like.
• 1,5 pentanediol from the viewpoint of viscosity and durability of a member used in an ink jet apparatus.
• the water-soluble alkanediol having hydroxyl groups at both ends of the main chain is contained in an amount of 3 to 15% by weight based on the whole ink composition. 3.0 to 6.0% by weight More preferably it is contained.
• the content ratio of the water-soluble 1,2 alkanediol and the water-soluble alkanediol having a hydroxyl group at both ends of the main chain is 10: 1 to 1: 1 on a weight basis. It is preferable that By setting the mixing ratio within this range, ejection is stabilized by improving glossiness by reducing the surface tension and adjusting the surface tension at a specific frequency in glossy paper based on photographic paper.
• the edge sharpness of small fonts can be improved by improving the ink droplet landing accuracy.
• a polyoxyethylene chain and a Z or polypropylene chain added as a penetrating solvent, 1.2 alkanediol having 5 to 10 carbon atoms and Z or 3 to 10 carbon atoms.
• alkanediol and Z or ratatams and Z or ratatones added as a penetrating solvent, 1.2 alkanediol having 5 to 10 carbon atoms and Z or 3 to 10 carbon atoms.
• the ink composition for ink jet recording according to the present invention contains a surfactant as an essential component.
• a recording medium the surface of which is coated with a resin for accepting ink, but by using a surfactant, it is suitable for recording media such as photographic paper where glossiness is more important. Thus, an image having excellent gloss can be realized.
• an organopolysiloxane surfactant is used as the surfactant used in the present invention.
• an organopolysiloxane surfactant as described above Because it contains two specific types of alkanediols, the solubility of the surfactant in the ink is improved and the generation of insolubles can be suppressed, resulting in an ink composition with better ejection stability. it can.
• organopolysiloxane surfactant the following formula:
• R represents a hydrogen atom or a methyl group
• a represents 7 to: an integer of L 1
• m represents an integer of 20 to 70
• n represents an integer of 2 to 5.
• the unevenness of the surface of the recorded material can be further smoothed.
• R represents a hydrogen atom or a methyl group
• a represents an integer of 2 to 5
• m represents an integer of 20 to 70
• n represents an integer of 2 to 4, containing one or more compounds.
• R represents a hydrogen atom or a methyl group
• a represents an integer of 9 to 13.
• M represents an integer of 2 to 4, and n preferably contains 1 or 2 polysiloxane compound.
• the reason why the unevenness of the surface of the recorded matter can be smoothed by containing the specific polyorganosiloxane compound as described above is considered as follows. That is, for example, 20% by weight of glycerin (glycerol), 10% by weight of 2-hexanediol, Sexual agent 0. This is probably because the 1 Hz surface tension of the aqueous solution is 25 mN / m or less, and by containing the above-mentioned surfactant, the aqueous solution containing glycols can have an extremely low surface tension.
• Surfhinol 465 which is an acetylene glycol surfactant, has a surface tension of 25 mN / m or more when an aqueous solution having the same composition as described above is used.
• KF-954A, KF-353A, KF6017, X-22-22551, AW-3 All Shinetsu An industrial stock company
• the surfactant is preferably contained in the ink composition according to the present invention in an amount of 0.01 to 2.00% by weight, more preferably 0.05 to 0.50% by weight.
• the above-mentioned surfactant having an R-catalyst group it is preferable to increase the content as compared with the above-described surfactant in which R is H.
• the ink composition according to the present invention includes other surfactants, specifically, fluorine-based surfactants, acetylene glycol-based surfactants, er-on surfactants, and non-one surfactants. Further, an amphoteric surfactant or the like may be further added.
• acetylene glycol surfactants include, for example, 2, 4, 7, 9-tetramethyl-5-decyne-4,7-diol, 3,6-dimethyl-4-octyne-3,6-diol, Or 3,5 dimethyl-1 monohexyne 3ol, 2,4 dimethyl-5 monohexyne 3-ol, etc.
• commercially available acetylene glycol surfactants can be used, such as Orphin E1010, STG, Y (trade name, manufactured by Nisshin Igaku), Surfino Nore 61, 104, 82, 465, 485 or TG (trade name, manufactured by Air Products and Chmicals Inc.).
• a deviation between a dye and a pigment can be used, but a pigment can be preferably used from the viewpoint of light resistance and water resistance.
• inorganic pigments and organic pigments can be used, and each can be used alone or in combination.
• examples of the inorganic pigment include titanium oxide.
• carbon black produced by a known method such as a contact method, a furnace method, or a thermal method can be used.
• examples of the organic pigment include azo pigments (including azo lakes, insoluble azo pigments, condensed azo pigments, chelate azo pigments), polycyclic pigments (for example, phthalocyanine pigments, perylene pigments, perinone pigments, anthraquinone pigments).
• quinacridone pigments dioxazine pigments, thioindigo pigments, isoindolinone pigments, quinofullerone pigments, etc.
• dye chelates eg basic dye chelates, acid dye chelates
• nitro pigments nitroso pigments, alin black Etc.
• pigments for yellow ink compositions CI pigment yellow 1, 2, 3, 12, 14, 16, 17, 73, 74, 75, 83, 93, 95, 97, 98, 109, 110, 114, 128, 129, 138, 139, 147, 150, 151, 154, 155, 180, 185 and the like, and one or more of these are used. Of these, C.
• Pigment Yellow 74, 110, 128 and 147 It is preferable to use one or two or more selected from the group power.
• Examples of the pigment for the magenta ink composition include C.I. Pigment Red 5, 7, 12, 48 (Ca), 48 (Mn), 57 (Ca), 57: 1, 112, 12
• C. I. Pigment Noilet 19 isotonicity one or more of these are used.
• the pigment for the cyan ink composition include CI pigment blue 1, 2, 3, 15: 2, 15: 3, 15: 4, 15:34, 16, 22, 60; CI nonot blue 4 60, etc., and one or more of these are used.
• C.I. Pigment Blue 15: 3 and Z or 15: 4 are particularly preferred, and C.I. Pigment Blue 15: 3 is particularly preferred.
• pigment for the black ink composition examples include carbon blacks such as furnace black, lamp black, acetylene black, and channel black (CI pigment black 7), inorganic pigments such as iron and iron pigments; -Organic pigments such as phosphorus black (CI pigment black 1).
• the pigment is preferably a pigment kneaded with a dispersant described later.
• An excellent color image can be formed even with a pigment that has not been surface-treated.
• the ink composition according to the present invention preferably comprises a copolymerized resin of a hydrophobic monomer and a hydrophilic monomer as a dispersant for dispersing the colorant. These copolymerized resins are adsorbed on the pigment to improve dispersibility.
• hydrophobic monomer examples include, for example, methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, n-propyl acrylate, n-propyl methacrylate, iso propyl acrylate.
• hydrophilic monomer examples include acrylic acid, methacrylic acid, maleic acid, and itaconic acid.
• the copolymerized resin of the hydrophobic monomer and the hydrophilic monomer achieves color image glossiness, prevention of bronzing, and storage stability of the ink composition, and forms a color image with further excellent glossiness.
• styrene (meth) acrylic acid copolymer resin styrene-methylstyrene- (meth) acrylic acid copolymer resin, or styrene-maleic acid copolymer resin, (meth) acrylic acid (meth) It is preferably at least one of an acrylic ester copolymer resin and a styrene (meth) acrylic acid (meth) acrylic ester copolymer resin.
• the copolymerized resin may be a resin (styrene-acrylic acid resin) containing a polymer obtained by reacting styrene with acrylic acid or an ester of acrylic acid.
• the copolymerized resin may be an acrylic acid-based water-soluble resin.
• salts of sodium, potassium, ammonium and the like may be used.
• the content of these copolymer resins is the above-mentioned from the viewpoint of achieving both color image glossiness, prevention of bronzing, and storage stability of the ink composition and formation of a color image having further excellent glossiness.
• the amount is preferably 10 to 50 parts by weight and more preferably 10 to 35 parts by weight with respect to 100 parts by weight of the pigment.
• surfactants include fatty acid salts, higher alkyl dicarboxylates, higher alcohol sulfate esters, higher alkyl sulfonates, higher fatty acid and amino acid condensates, sulfosuccinic acid.
• Anionic surfactants such as ester salts, naphthenates, liquid fatty oils, sulfuric ester salts, alkylaryl sulfonates; Cationic surfactants such as fatty acid amine salts, quaternary ammonium salts, sulfo-um salts, phospho- ums; polyoxyethylene alkyl ethers, polyoxyethylene alkyl esters, sorbitan alkyl esters And nonionic surfactants such as polyoxyethylene sorbitan alkyl esters. It goes without saying that the above-mentioned surfactant is added to the ink composition, so that it also functions as a surfactant, but is added so that the contact angle with the recording medium is in the above range. There is a need.
• the ink composition for inkjet recording according to the present invention contains the above-mentioned specific solvent, surfactant, and other various additives, and water as a solvent.
• water it is preferable to use pure water or ultrapure water such as ion exchange water, ultrafiltration water, reverse osmosis water, or distilled water.
• water obtained by sterilizing these waters by ultraviolet irradiation or hydrogenation with peroxy acid or the like is preferable because generation of bacteria is prevented over a long period of time.
• the ink composition for ink jet recording according to the present invention may further contain an organic amine.
• the wettability of the recording medium or the like to the recording surface can be increased to increase the ink permeability, and the pH of the ink composition can be easily adjusted to a suitable range. it can.
• the organic amine tertiary amine can be preferably used.
• tertiary amines include alkanolamines such as triethanolamine.
• the pH of the ink composition according to the present invention is preferably 8 to 12, particularly 8 to 10. When the pH is within the range where power is applied, deterioration of the member that comes into contact with the ink can be prevented.
• the content of the organic amine with respect to the total weight of the ink composition is 0.1% by weight or more.
• the penetrability can be increased, and from the viewpoints of ink ejection stability, storage stability, and high-speed printing, it is preferably 0.1 to 8.0% by weight, more preferably 0.5 to 5.0. % By weight, more preferably 1.0 to 3.0% by weight.
• the ink composition according to the present invention preferably contains a penetrant in addition to the above components.
• glycol ethers can be preferably used.
• Specific examples of the glycol ethers include ethylene glycol monomethyl ether, ethylene glycol monoethylenoateolene, ethyleneglycolenomonomono propinoreinotenole, ethyleneglycolenomono- n- butinoleenotenole, ethyleneglycolenomonoiso -Butinoreethenole, Ethyleneglycolenomono-tert-Butinoleetenore, Ethyleneglycol Monoremonomethinoreatenoacetate, Diethyleneglycolenomonomethinoreatenore, Jetyleneglycolenoremonotenoleatere, Diethyleneglycol Nolemono-propynole ether, diethylene glycol mono-iso propyl ether, diethylene glycol mono-n-butyl ether, diethylene glycol mono-
• alkyl ethers of polyhydric alcohols are preferred, especially ethylene glycol monoethyl ether, ethylene glycol mono- n- butenoatenore, diethyleneglycolenomonomethinoatenole, diethyleneglycolenolemono. et Chinoreetenore, diethylene glycol Honoré mono over n - butyl Honoré ether Honoré, triethylene glycol monomethyl ether, triethylene glycol monomethyl e chill ether or Toriechirengu recall mono over n - butyl ether. More preferred is triethylene glycol mono-n-butyl ether.
• the addition amount of the penetrant may be appropriately determined, but is preferably about 0.1 to 30% by weight, more preferably about 1 to 20% by weight.
• the ink composition according to the present invention preferably contains a recording medium solubilizer in addition to the above components.
• a recording medium solubilizer pyrrolidones such as N-methyl-2-pyrrolidone and ratatones such as Z or ⁇ -petit-mouth ratatones can be preferably used.
• the addition amount of the recording medium solubilizer may be appropriately determined, but is preferably about 0.1 to 30% by weight, more preferably about 1 to 20% by weight.
• the ink composition for ink jet recording according to the present invention preferably further comprises a wetting agent.
• a wetting agent polyhydric alcohols and / or sugars can be preferably used.
• polyhydric alcohols include glycerin, ethylene glycol, diethylene glycol, triethylene glycol, and trimethylolpropane.
• saccharides include monosaccharides, disaccharides, oligosaccharides (including trisaccharides and tetrasaccharides) and polysaccharides, preferably glucose, mannose, fructose, ribose, xylose, arabinose, galactose, aldonic acid, Examples include glucitol, (sorbitol), manoleose, cellobiose, ratatoose, sucrose, trenorose, manoletotriose, and the like.
• a polysaccharide means a saccharide in a broad sense and is used to include a substance that exists widely in nature, such as alginic acid, a-cyclodextrin, and cellulose.
• the derivatives of these saccharides include the reducing sugars of the aforementioned saccharides (for example, sugar alcohols (represented by the general formula HOCH (CHOH) CH OH (where n represents an integer of 2 to 5)) , Acid
• Saccharified sugars eg, aldonic acid, uronic acid, etc.
• amino acids thiosaccharides
• particularly preferred sugar alcohols include maltitol, sorbitol, and xylitol.
• HS500 manufactured by Hayashibara Shoji Co., Ltd.
• hyaluronate one marketed as a 1% aqueous solution of sodium hyaluronate (molecular weight: 350000) can be used.
• trimethylolpropane and 1,2,6-hexatriol can also be suitably used.
• the addition amount of the wetting agent is preferably 3 to 30% by weight, more preferably about 3 to 20% by weight, and further preferably 3 to 10% by weight. It will be apparent to those skilled in the art that some of the penetrating solvents described above also act as wetting agents.
• the content ratio of the water-soluble alkanediol having hydroxyl groups at both ends of the main chain and the wetting agent is preferably 1: 1 to 1:10 on a weight basis. Yes.
• the mixing ratio within this range, moisture from glossy paper based on photographic paper immediately after recording can be reduced. Condensation due to detachment of the lubricant can be suppressed, and clogging can be prevented with low viscosity.
• the ink composition according to the present invention further includes a nose, a clogging preventive agent, a preservative, an antioxidant, a conductivity adjusting agent, a PH adjusting agent, a viscosity adjusting agent, a surface tension adjusting agent, an oxygen absorber, and the like. Can be added.
• antiseptics and fungicides examples include sodium benzoate, sodium pentachlorophenol, sodium 2-pyridinethiol 1-oxide, sodium sorbate, sodium dehydroacetate, 1,2-dibenzthiazoline — 3-on (ICI Proxel CRL, Proxel BND, Proxel GXL, Proxel XL-2, Proxel TN) and the like.
• pH adjusters, solubilizers or acid inhibitors include amines such as diethanolamine, triethanolamine, propanolamine, morpholine, and their modified products, Inorganic salts such as potassium, sodium hydroxide and lithium hydroxide, ammonium hydroxide, quaternary ammonium hydroxide (such as tetramethyl ammonium), potassium carbonate, sodium carbonate, lithium carbonate, etc.
• amines such as diethanolamine, triethanolamine, propanolamine, morpholine, and their modified products
• Inorganic salts such as potassium, sodium hydroxide and lithium hydroxide, ammonium hydroxide, quaternary ammonium hydroxide (such as tetramethyl ammonium), potassium carbonate, sodium carbonate, lithium carbonate, etc.
• Carbonates and other phosphates such as N-methyl-2-pyrrolidone, urea, thiourea and tetramethylurea, allophanates such as allophanate and methylallohanate, and piurets such as biuret, dimethylbiuret and tetramethylbiuret And L-ascorbic acid and its salts.
• ureas such as N-methyl-2-pyrrolidone
• urea such as urea, thiourea and tetramethylurea
• allophanates such as allophanate and methylallohanate
• piurets such as biuret, dimethylbiuret and tetramethylbiuret And L-ascorbic acid and its salts.
• the ink composition according to the present invention may contain an antioxidant and a UV absorber.
• examples of the ink composition include Tinuvin 328, 900, 11 30 of Chinoku Specialty Chemicals. 384, 292, 123, 144, 622, 770, 292, Irgacor 252 153, Irganox 1010, 1076, 1035, MD1024, lanthanide oxide, and the like.
• the ink composition according to the present invention can be produced by dispersing and mixing the above-described components by an appropriate method.
• the pigment, polymer dispersant, and water are first dispersed in a suitable dispersing machine (eg, ball mill, sand mill, attritor, roll mill, agitator mill, Henschel mixer, colloid mill, ultrasonic homogenizer, jet mill, ang mill, etc.)
• a suitable dispersing machine eg, ball mill, sand mill, attritor, roll mill, agitator mill, Henschel mixer, colloid mill, ultrasonic homogenizer, jet mill, ang mill, etc.
• rosin water, water-soluble organic solvent, sugar, PH preparation, preservative, antifungal agent, etc.
• Fully dissolved To prepare an ink solution. After sufficiently stirring, the target ink composition can be obtained by performing filtration in order to remove the coarse particle size and foreign matters that cause clogging.
• the ink jet recording method according to the present invention performs printing by ejecting droplets of the ink composition described above, and depositing the droplets on a recording medium so that the dots overlap each other. In this way, it is attached to the recording medium.
• it is preferable to use printing paper as a recording medium. Even when such a specific recording medium is used, an image having excellent gloss and good color reproducibility is used. Can be realized.
• the ink droplets and the ink droplets are ejected so that the dot arrangement in the direction perpendicular to the scanning direction of the recording head is alternately arranged.
• the use of the above-described ink composition of the present invention significantly improves the unevenness of aggregation as compared with the conventional ink composition.
• Each ink was prepared by mixing each component according to the composition shown in Table 1 below and filtering through a 10 m membrane filter.
• the styrene monoacrylic resin in the table is a copolymer having a molecular weight of 1600 and an acid value of 150.
• A The width of the shoreline is less than 10% on average.
• the average width of the shoreline is 10% or more.
• A It is recovered to the same level as the initial stage after 3 cleaning operations.
• DutylOO% recordings of each ink were obtained at a resolution of 1440 X 720dpi.
• the 45-degree specular gloss of this record was measured using a Go-Off otometer GP-200 (trade name: manufactured by Murakami Color Research Laboratory), and the gloss was evaluated based on the following criteria.
• the measurement conditions were a sensitivity of 500 and a standard black specular glass plate with a 45 ° specular gloss of 42.

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• 2006
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