JP2007277352A - Inkjet recording nonaqueous ink composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink composition which reduces an environmental load, excels in printing quality and ink reliability, particularly has a printing density for plain paper, and improves strike-through. <P>SOLUTION: This nonaqueous ink composition comprises at least a pigment, a dispersing agent, a fatty acid ester derived from a vegetable oil, a nonaqueous polar solvent, and solid fine particles. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

Background of the Invention

FIELD OF THE INVENTION The present invention relates to a non-aqueous ink composition for ink-jet recording, and more particularly to a non-aqueous ink composition for ink-jet recording that has low environmental impact and is excellent in print quality and ink reliability.

BACKGROUND ART An ink jet recording method is a method of recording characters and figures on the surface of a recording medium such as paper by ejecting ink droplets from a fine nozzle head. As an ink jet recording method, an electric signal is converted into a mechanical signal using an electrostrictive element, and ink droplets stored in the nozzle head portion are intermittently ejected to record characters and symbols on the surface of the recording medium. A part of the ink liquid is rapidly heated near the discharge part of the head to generate bubbles, and ink droplets are intermittently discharged by the volume expansion caused by the bubbles, and characters and symbols are printed on the surface of the recording medium. A recording method has been put to practical use. In these ink jet recording methods, water-based ink using water as a main solvent and non-aqueous ink using an organic solvent as a main solvent are generally used.

  Non-aqueous inks have less solvent evaporation than water-based inks, so there is little change in physical properties such as ink viscosity during printing, and water-based inks are flushing that spits thickened ink near the nozzles of inkjet recording devices. However, it is not necessary to perform flushing with a non-aqueous ink, so that high-speed printing is possible. In addition, even when printing on plain paper, there is an advantage that unevenness (cockling) hardly occurs in the printing portion. On the other hand, although the non-aqueous ink has such advantages, since the solvent is less likely to volatilize on the recording medium, there is a case where a so-called back-through occurs in which the printed portion is seen through from the back side of the recording medium due to the remaining solvent. is there.

  Various improvements have been attempted for such problems. For example, Japanese Patent Application Laid-Open No. 2004-2666 (Patent Document 1) discloses that a nonpolar solvent having a 50% distillation point of 280 ° C. or higher and 50% There has been proposed a non-aqueous ink that is difficult to see through by mixing with a polar solvent having a distillation point of 300 ° C. or higher.

  By the way, in such non-aqueous inks, in recent years, attempts have been made to use a solvent derived from vegetable oil having a low environmental load. For example, Japanese Patent Application Laid-Open No. 2005-132907 (Patent Document 2) proposes a non-aqueous ink using a vegetable oil-derived fatty acid ester as a solvent.

However, inks using such vegetable oil-derived fatty acid esters as solvents may have insufficient print quality, and ink reliability may be a problem. In particular, in an ink using a plant-derived fatty acid ester as an ink solvent, there are cases in which the printing density is insufficient with respect to plain paper or back-through occurs.
Japanese Patent Laid-Open No. 2004-2666 JP-A-2005-132907

Summary of the Invention

  By adding a non-water-soluble polar solvent and solid fine particles to a non-aqueous ink using a plant-derived fatty acid ester as a solvent, the present inventors have reduced environmental burden and improved printing quality and ink reliability. It was found that a non-aqueous ink that is excellent, especially with a high printing density and improved through-through on plain paper, can be realized. The present invention is based on this finding.

  Accordingly, an object of the present invention is to provide a non-aqueous ink composition for ink-jet recording that has a low environmental impact, is excellent in print quality and ink reliability, and has a high print density and improved reverse printing especially on plain paper. It is to provide.

  The non-aqueous ink composition for inkjet recording according to the present invention comprises at least a pigment, a dispersant, a fatty acid ester derived from vegetable oil, a non-aqueous polar solvent, and solid fine particles.

  According to the present invention, it is possible to realize a non-aqueous ink composition for ink-jet recording that has a low environmental load, is excellent in print quality and ink reliability, and does not cause any back-through of plain paper.

Detailed description of the invention

  The non-aqueous ink composition for ink-jet recording according to the present invention comprises, as essential components, a pigment, a dispersant, a fatty acid ester derived from vegetable oil, a non-aqueous polar solvent, and solid fine particles. Uses vegetable oil-derived fatty acid ester as the solvent for non-aqueous inks, adds non-aqueous polar solvents that are miscible with esters, and adds solid fine particles to reduce environmental impact, as well as print quality and ink reliability. In particular, it is possible to realize an ink that has a high print density and an improved back-through for plain paper.

  In addition, the non-aqueous ink composition for ink jet recording according to the present invention is expected to be capable of realizing an image having excellent color development and no unevenness even when a printing paper having a surface coated as a recording medium is used. It was outside. The reason for this is not clear, but is considered as follows. That is, the non-aqueous polar solvent prevents the fatty acid ester derived from vegetable oil from diffusing into the recording medium, and the solid fine particles function as a sealant for the recording medium. It is considered that the improvement of the printing density can be achieved at the same time, and the excellent coloring property without unevenness can be realized even for the printing paper or the like in which the ink spreads.

  The fatty acid ester derived from the vegetable oil used in the present invention is a fatty acid ester obtained by esterifying a fatty acid obtained by hydrolyzing vegetable fat with a known method using an alcohol, and an ester of the vegetable fat obtained using a suitable alcohol. Examples include fatty acid esters obtained by exchange (alcolysis), and these fatty acid esters can be used in the present invention as long as they are liquid at room temperature.

（式中、Ｒ_１は炭素数５〜２３の直鎖または分岐鎖を有する飽和もしくは不飽和のアルキル基を表し、Ｒ_２は、炭素数１〜１０の直鎖または分岐鎖を有するアルキル基を表す。）
で表される脂肪酸エステルが好ましい。 The fatty acid ester obtained by esterifying a fatty acid obtained by hydrolyzing vegetable oil with an alcohol by a known method includes the following formula:

(In the formula, R ₁ represents a saturated or unsaturated alkyl group having a linear or branched chain having 5 to 23 carbon atoms, and R ₂ represents an alkyl group having a linear or branched chain having 1 to 10 carbon atoms. To express.)
The fatty acid ester represented by these is preferable.

  Specifically, fatty acid esters represented by the above formula are soybean oil, coconut oil, coconut oil, rapeseed oil, palm oil, palm kernel oil, tung oil, linseed oil, sesame oil, corn oil, sunflower oil, and safflower oil. The fatty acids obtained by hydrolysis of these vegetable oils such as hydrogenated oils by a known method can be obtained by esterification with an appropriate alcohol.

  Examples of the fatty acid esters include methyl, ethyl, propyl, butyl, hexyl, 2-ethylhexyl, heptyl, and octyl esters of caprylic acid, palmitic acid, lauric acid, oleic acid, or myristic acid. Of these, 2-ethylhexyl caprylate, propyl laurate, methyl laurate, butyl oleate and 2-ethylhexyl oleate, and mixtures thereof are preferred.

  In addition, examples of the fatty acid ester obtained by transesterification (alcoholization) of a vegetable oil with an appropriate alcohol include those obtained by transesterifying the above vegetable oil with an alcohol by a known method. For example, Palm oil fatty acid, palm oil fatty acid, palm kernel oil fatty acid, rapeseed oil fatty acid, soybean oil fatty acid, coconut fatty acid and other vegetable oil fatty acids methyl, ethyl, propyl, butyl, hexyl, 2-ethylhexyl, heptyl, octyl, nonyl, decyl, un Examples include decyl ester. Among these, at least one selected from soybean oil fatty acid ester, coconut fatty acid ester, coconut oil fatty acid ester, and rapeseed oil fatty acid ester can be suitably used. Specifically, soybean oil fatty acid 2-ethylhexyl, coconut fatty acid 2-ethylhexyl, and the like can be suitably used.

  Moreover, in this invention, in addition to the fatty acid ester derived from vegetable oil, you may contain the vegetable oil which consists of semi-drying oil and / or non-drying oil as a solvent.

  Examples of the semi-drying oil include soybean oil, rapeseed oil, cottonseed oil, sesame oil, and corn oil. Examples of the non-drying oil include castor oil, peanut oil, and olive oil. Among these, semi-drying oil rapeseed oil is preferable. Note that an ink composition containing a drying oil such as eno oil, linseed oil, tung oil, safflower oil, etc. is not preferable because it causes a change over time and ink clogging occurs in the nozzle portion of the ink jet printer.

  The fatty acid ester derived from vegetable oil used in the present invention is a fatty acid ester obtained by esterifying a fatty acid obtained by hydrolyzing vegetable oil with a known method using an alcohol, or a transesterification of a vegetable oil using a suitable alcohol. The fatty acid ester obtained by (alcolysis) may be used alone, or a mixture of these two fatty acid esters can be used. In this invention, it is preferable from a viewpoint of stability of physical property to use the fatty acid ester obtained by esterifying the fatty acid obtained by hydrolyzing vegetable fat and oil which is a single compound with alcohol by a well-known method.

  The fatty acid ester derived from vegetable oil used in the present invention is preferably 50 to 90% by weight based on the whole ink composition. When the content of the fatty acid ester is less than 50% by weight, sufficient ink spread cannot be obtained, and the coverage during solid printing may be poor and the concentration may not be obtained.

  In the present invention, the non-aqueous polar solvent used together with the vegetable oil-derived fatty acid ester is not particularly limited as long as the viscosity at 20 ° C. is 20 mPa · s or less, and various non-aqueous polar solvents. Can be used. Non-aqueous polar solvents include C3 to C12 linear or branched alcohols, diethylene glycol monoalkyl ether, triethylene glycol monoalkyl ether, propylene glycol monoalkyl ether, dipropylene glycol monoalkyl ether, diethylene glycol dialkyl ether, triethylene Glycol dialkyl ether, propylene glycol dialkyl ether, dipropylene glycol dialkyl ether, C2-C10 alkyl glyceryl ether, diethylene glycol monoalkyl ether acetate, triethylene glycol monoalkyl ether acetate, propylene glycol monoalkyl ether acetate, dipropylene glycol monoalkyl ether Acetate polyvalent al It includes non-aqueous polar solvent such derivatives Lumpur.

  C3-C12 linear or branched alcohols include n-propanol, isopropanol, butoxyethanol, butoxyisopropanol, n-butanol, isobutanol, 2-butanol, t-butanol, ethoxyethanol, methoxymethoxyethanol, 1 -Pentanol, 2-methyl-1-butanol, 3-methyl-1-butanol, 3-pentanol, n-hexanol, 4-methyl-2-pentanol, 2-ethylbutanol, n-heptanol, 2-heptanol, 3- Examples include heptanol, n-octanol, 2-octanol, 2-ethylhexanol, 3,5,5-trimethylhexanol, n-dodecanol, and trimethylnonyl alcohol.

  Preferred non-aqueous polar solvents include diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, propylene glycol monoethyl ether, propylene glycol monobutyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monobutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether. , Diethylene glycol dibutyl ether, triethylene glycol dimethyl ether, triethylene glycol diethyl ether, propylene glycol dimethyl ether, propylene glycol dimethyl ether, dipropylene glycol methyl ether, dipropylene glycol diethyl ether, ethyl glyceryl ether, ethyl ether Sill glyceryl ether, cetyl glyceryl ether, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, triethylene glycol monobutyl ether acetate, and the like.

  Further, it is preferable that the non-aqueous polar solvent used in the present invention is contained in an amount of 2 to 30% by weight based on the whole ink. By adding the non-aqueous polar solvent in this range, it is possible to achieve both higher printing density and printing suitability. In addition, when the addition amount of the non-aqueous polar solvent exceeds 30% by weight, the drying property of the ink may be deteriorated.

  The solid fine particles used in the non-aqueous ink composition for ink jet recording according to the present invention function as a sealing effect on the recording medium. The particle size of the solid fine particles is preferably 0.5 μm or less, more preferably 0.1 to 0.5 μm. By setting the particle size within this range, the print density on plain paper is improved. At the same time, ink with higher ink reliability can be realized.

  If the particle size of the solid fine particles exceeds 0.5 μm, the solid fine particles may settle in the ink and the reliability of the ink may be lowered. Further, when the particle size of the solid fine particles is less than 0.1 μm, the sealing effect cannot be expected, and the printing density may be insufficiently improved.

  The solid fine particles are preferably contained in the ink composition in an amount of 1 to 15% by weight. By setting it within this range, ink penetration can be further improved and ink reliability can be maintained.

  Examples of solid fine particles that can be suitably used in the present invention include inorganic materials such as silica, talc, clay, light calcium carbonate, titanium oxide, alumina white, kaolin, mica, and aluminum hydroxide, polyacrylates, polyurethanes, polyesters, Organic materials such as polystyrene, polypropylene, and epoxy resin can be used. Among these, silica is more preferable.

  The pigment that can be used in the non-aqueous ink composition for ink jet recording according to the present invention is not particularly limited, and inorganic or organic pigments used in ordinary non-aqueous inks can be used. Pigments include inorganic pigments such as carbon black, titanium oxide, bitumen, ultramarine, petal, zinc white, calcium carbonate, insoluble azo pigments such as benzidine yellow, hansa yellow, toluidine red, permanent red 2B, pigment scarlet, ritole. Soluble azo pigments such as red, phthalocyanine blue such as phthalocyanine blue and phthalocyanine green, quinacridone such as quinacridone red, pyranthrone such as pyranslon orange and pyranthrone red, quinophthalone such as quinophthalone yellow, thioindigo, anthraquinone, Examples thereof include organic pigments such as dioxazine, benzimidazolone, isoindolinone, and diketopyrrolopyrrole.

  The addition amount of the colorant is preferably 0.5 to 20% by weight with respect to the entire ink composition. By setting the addition amount within this range, a desired color density can be obtained and the ejection stability of the ink can be obtained. Reliability is also good.

  The non-aqueous ink composition for ink jet recording according to the present invention contains a dispersant for dissolving or dispersing the pigment in the ink. As the dispersant, a dispersant usually used in non-aqueous inks using pigments can be used. Such dispersants include hydroxyl group-containing carboxylic acid esters, salts of long-chain polyaminoamides and high molecular weight acid esters, salts of high molecular weight polycarboxylic acids, salts of long chain polyaminoamides and polar acid esters, high molecular weight unsaturated acids. Ester, polymer copolymer, modified polyurethane, modified polyacrylate, polyether ester type anionic activator, naphthalene sulfonic acid formalin condensate salt, aromatic sulfonic acid formalin condensate salt, polyoxyethylene alkyl phosphate ester, Polyoxyethylene nonylphenyl ether, polyester polyamine, stearylamine acetate, etc. can be used.

  Specific examples of these dispersants include Anti-Terra-U (polyaminoamide phosphate), Anti-Terra-203 / 204 (high molecular weight polycarboxylic acid salt), Disperbyk-101 (polyaminoamide phosphate and acid ester). ), 107 (hydroxyl group-containing carboxylic acid ester), 110 (copolymer containing an acid group), 130 (polyamide), 161, 162, 163, 164, 165, 166, 170 (Polymer copolymer), 400, Bykumen (high molecular weight unsaturated acid ester), BYK-P104, P105 (high molecular weight unsaturated acid polycarboxylic acid), P104S, 240S (high molecular weight unsaturated acid polycarboxylic acid) Acid and silicon), Lactimon (long chain amine and unsaturated acid polycarboxylic acid and silicon): The deviation of which are manufactured by BYK Chemie Co., Ltd.) and the like.

EFKA 44, 46, 47, 48, 49, 54, 63, 64, 65, 66, 71, 701, 764, 766 (manufactured by EfkaCHEMICALS), Fuka Polymer 100 (modified polyacrylate), 150 (aliphatic modified polymer), 400, 401, 402, 403, 450, 451, 452, 453 (modified polyacrylate), 745 (copper) Phthalocyanine-based): all manufactured by EfkaCHEMICALS), Florene TG-710 (urethane oligomer), Florene DOPA-15B (acrylic oligomer), Florene SH-290, SP-1000, Polyflow No. 50E, No. 300 (acrylic copolymer: all manufactured by Kyoeisha Chemical Co., Ltd.), Disparon KS-860, 873SN, 874 (polymer dispersing agent), # 2150 (aliphatic polycarboxylic acid), # 7004 (poly) Ether ester type), DA-703-50 (polyester acid amide amine salt: all manufactured by Enomoto Kasei Co., Ltd.), and further, demole RN, N (naphthalene sulfonate formalin condensate sodium salt), MS. C, the same SN-B (aromatic sulfonic acid formalin condensate sodium salt), the same EP, homogenol L-18 (polycarboxylic acid type polymer), Emulgen 920, 930, 931, 935, 950, 985 (polyoxyethylene nonylphenyl ether), acetamine 24 (coconut amine acetate), 86 (stearyl amine acetate: all manufactured by Kao Corporation), Solsperse 5000 (phthalocyanine ammonium salt type), 13940 (polyesteramine type), 17000, 18000 (fatty acid amine series), 22000, 24000, 28000 (all manufactured by Avicia), Nikkor T106 (polyoxyethylene sorbitan monooleate), MYS-IEX (polyoxyethylene monostearate), Hex agline4-O (hexaglyceryl tetraoleate: all manufactured by Nikko Chemical Co., Ltd.).

  In the present invention, the non-aqueous ink composition for ink jet recording is added with various known additives such as a pH adjuster, a surfactant, an antioxidant, an ultraviolet absorber, an antiseptic / antifungal agent, etc., as necessary. be able to.

  The ink composition according to the present invention can be produced by dispersing and mixing each of the above components by an appropriate method. Preferably, the solid particles and the color pigment are separately separated using an appropriate disperser (eg, ball mill, sand mill, attritor, roll mill, agitator mill, Henschel mixer, colloid mill, ultrasonic homogenizer, jet mill, ang mill, etc.) Then, they are mixed, and then an ink solution is prepared by adding a pH adjuster, an antiseptic, an antifungal agent and the like and sufficiently dissolving them. After sufficiently stirring, the target ink composition can be obtained by performing filtration in order to remove the coarse particle diameter and foreign matters that cause clogging.

  The ink jet recording method according to the present invention performs printing by discharging droplets of the ink composition described above and attaching the droplets to a recording medium. By applying the ink composition according to the present invention to the ink jet recording method, it is possible to realize an ink with less environmental load and excellent print quality and ink reliability.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited by these Examples.

<Preparation of non-aqueous ink composition>
Using carbon black MA-8 (manufactured by Mitsubishi Chemical) as a pigment and using a polyester-based dispersant (Solsperse 28000, manufactured by Avisia) as a dispersant, the total amount is 100 parts by weight according to the composition shown in Table 1 below. Each component was added so that it became, and it stirred for 2 hours. Thereafter, the mixture was filtered with a membrane filter having a pore diameter of about 1.2 μm (trade name, manufactured by Nippon Millipore Limited) to prepare non-aqueous inks 1 to 12. In addition, all the numerical values in Table 1 indicate parts by weight.

<Evaluation of ink composition>
(1) Print density on plain paper Using the ink jet printer PX-V600 (manufactured by Seiko Epson Corp.), solid printing (100%) on the following three types of plain paper using the ink composition obtained with the ink composition PX-V600. duty). As plain paper, Xerox P (manufactured by Fuji Xerox Co., Ltd.), Xerox 4024 (manufactured by Xerox Co.), and recycle cut R-100 (manufactured by Oji Paper Co., Ltd.) were used. The printed matter was left for 24 hours in an environment of 24 ° C., and then the OD value of the solid portion was measured using a Gretag densitometer (manufactured by Gretag Macbeth).
The print density was evaluated based on the following criteria using an average value of measured values in each printed matter.
A: Print density is 1.0 or more B: Print density is 0.9 or more and less than 1.0 C: Print density is less than 0.9 Evaluation results are as shown in Table 2 below.

(2) Print quality Using the same ink jet printer as described above, solid printing was performed at 720 × 720 dpi on the above three types of recording media and OK Topcoat N (manufactured by Oji Paper Co., Ltd.). About each obtained printed matter, print quality was evaluated visually. The evaluation criteria were as follows.
A: The color is good and there is no unevenness.
B: Some unevenness occurs, but there is no practical problem.
C: Color development is poor or unevenness is conspicuous and cannot be used practically.
The evaluation results were as shown in Table 2 below.

(3) Cock ring Using an ink jet printer similar to the above, a 100% duty patch of 10 cm × 10 cm was printed at 720 × 720 dpi on the above four types of recording media, and irregularities (cockling) on the surface of the recording medium The degree was measured using a laser displacement meter LK-010 (manufactured by Keyence Corporation), and judged according to the following evaluation criteria.
A: Less than 1.0 mm B: 1.0 mm or more and less than 2.0 mm C: 2.0 mm or more Evaluation results were as shown in Table 2 below.

(4) Fixability immediately after printing (dryness)
Using the same ink jet printer as described above, solid printing was performed at 720 × 720 dpi on OK top coat N (manufactured by Oji Paper Co., Ltd.), which is the main printing paper. Immediately after printing, the printed surface was strongly rubbed with a finger, and the state of the printed surface was visually observed. The evaluation criteria were as follows.
A: No ink can be taken B: Some ink can be taken but fingers are not soiled C: Ink is removed and fingers are soiled Evaluation results are as shown in Table 2 below.

(5) Clogging recovery property Using an inkjet printer PX-V600 (manufactured by Seiko Epson Corporation), printing was continuously performed for 10 minutes, and after confirming that ink was normally discharged from all nozzles, the ink cartridge was removed. The recording head was removed and left in a 40 ° C. environment for one week with the recording head removed from the head cap. After leaving, the cleaning operation was repeated until all nozzles ejected at the same level as the initial stage, and the ease of recovery was evaluated according to the following criteria.
A: Recovered to the same level as the initial value after less than 3 cleaning operations B: Recovered to the same level as the initial value after 3 or more cleaning operations C: Even if the cleaning operation was performed, all nozzles were clogged and did not discharge. As shown in Table 2.

Claims (11)

  A non-aqueous ink composition for ink-jet recording, comprising at least a pigment, a dispersant, a fatty acid ester derived from vegetable oil, a non-aqueous polar solvent, and solid fine particles. The vegetable oil-derived fatty acid ester has the following formula:

(In the formula, R ₁ represents a saturated or unsaturated alkyl group having a linear or branched chain having 5 to 23 carbon atoms, and R ₂ represents an alkyl group having a linear or branched chain having 1 to 10 carbon atoms. To express.)
The non-aqueous ink composition for ink-jet recording according to claim 1, which is a fatty acid ester represented by:   The fatty acid ester derived from vegetable oil comprises at least one selected from the group consisting of 2-ethylhexyl caprylate, propyl laurate, methyl laurate, butyl oleate, and 2-ethylhexyl oleate. 3. A non-aqueous ink composition for ink jet recording according to 1 or 2.   The non-aqueous ink composition for inkjet recording according to claim 1 or 2, wherein the fatty acid ester derived from vegetable oil is a fatty acid ester obtained by transesterifying vegetable oil with alcohol.   The non-aqueous ink composition for inkjet recording according to claim 4, wherein the fatty acid ester of the vegetable oil is selected from the group consisting of soybean oil fatty acid ester, coconut fatty acid ester, coconut oil fatty acid ester, and rapeseed oil fatty acid ester. .   The non-aqueous polar solvent is a C3 to C12 linear or branched alcohol, and diethylene glycol monoalkyl ether, triethylene glycol monoalkyl ether, propylene glycol monoalkyl ether, dipropylene glycol monoalkyl ether, diethylene glycol dialkyl ether. , Triethylene glycol dialkyl ether, propylene glycol dialkyl ether, dipropylene glycol dialkyl ether, C2-C10 alkyl glyceryl ether, diethylene glycol monoalkyl ether acetate, triethylene glycol monoalkyl ether acetate, propylene glycol monoalkyl ether acetate, dipropylene glycol Monoalkyl ether acetate It is selected from the group consisting of derivatives of polyhydric alcohols, inkjet-recording non-aqueous ink composition according to any one of claims 1-5.   The non-aqueous ink composition for inkjet recording according to any one of claims 1 to 6, wherein the solid fine particles have a particle size of 0.5 µm or less.   The non-aqueous ink composition for inkjet recording according to claim 7, wherein the solid fine particles are silica.   The non-aqueous ink composition for inkjet recording according to any one of claims 1 to 8, wherein the solid fine particles are contained in an amount of 1 to 15% by weight.   An inkjet recording method for performing printing by discharging droplets of an ink composition and attaching the droplets to a recording medium, wherein the inkjet composition uses the ink composition according to any one of claims 1 to 9. Recording method.   A recorded matter recorded by the ink jet recording method according to claim 10.