JP4986261B2 - Inkjet recording method - Google Patents

Description

  The present invention relates to an ink set, an ink jet recording method, and a recorded matter, and more particularly, to an ink set, an ink jet recording method, and a recorded matter excellent in fixability even in a low water-absorbing recording medium as a recording medium.

  The ink jet recording method is a method of recording characters and figures on the surface of a recording medium such as paper by discharging 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 cause less solvent evaporation than water-based inks, so that physical property changes such as ink viscosity during printing are small. In addition, water-based inks need to be periodically flushed to spout thickened ink near the nozzles of the inkjet recording apparatus, whereas non-water-based inks do not need to be flushed, so high-speed printing is possible. It becomes possible. Further, the non-aqueous ink has an advantage that unevenness (cockling) is less likely to occur in the printed portion even when printing on a recording medium having low absorbency such as printing paper or plain paper, compared to the water-based ink.

  In such non-aqueous inks, attempts have been made in recent years to use a vegetable oil-derived solvent with a low environmental load. For example, Japanese Patent Laid-Open No. 2005-132907 (Patent Document 1) proposes a non-aqueous ink using a vegetable oil-derived fatty acid ester as a solvent.

However, inks using fatty acid esters derived from vegetable oils as solvents have poor drying properties when printed on recording media with low absorbency such as printing paper and plain paper, and the fixability to recording media is improved. There was room.
JP-A-2005-132907

  The present inventors have used a so-called two-component ink that forms an image by reacting a treatment liquid containing a gelling agent and an ink composition containing a pigment, so that the recording medium has relatively low ink absorbability. In particular, they have obtained knowledge that an ink with excellent print quality can be realized. The present invention is based on this finding.

  Accordingly, an object of the present invention is to provide an ink set excellent in fixability to a recording medium having low absorbency, an ink jet recording method using the ink set, and a recorded matter using the ink jet recording method.

（式中、Ｒ₁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、Ｒ₂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である、前記（１）に記載のインクジェット記録方法；
（３）前記植物油由来の脂肪酸エステルが、カプリル酸２−エチルヘキシル、ラウリン酸プロピル、ラウリン酸メチル、オレイン酸ブチル、およびオレイン酸２−エチルヘキシル、からなる群から選択される少なくとも１種を含んでなる、前記（１）又は（２）に記載のインクジェット記録方法；
（４）前記植物油由来の脂肪酸エステルが、植物油脂をアルコールによってエステル交換した脂肪酸エステルである、前記（１）〜（３）のいずれか１に記載のインクジェット記録方法；
（５）前記植物油脂が、大豆油脂、菜種油脂、ヤシ油脂、およびココナッツ油脂からなる群から選択されるものである、前記（４）に記載のインクジェット記録方法；
（６）前記植物油由来の脂肪酸エステルが、インク全体に対して１〜２０重量％含まれてなる、前記（１）〜（５）のいずれか１に記載のインクジェット記録方法。 The present invention achieves the above object by providing the following invention (1).
(1) An ink jet recording method in which droplets of a treatment liquid and a non-aqueous ink composition are ejected, and the droplets are attached to a recording medium to form an image, and an aluminum chelate compound as a gelling agent and room temperature The non-aqueous ink composition comprising the treatment liquid containing a vegetable oil-derived fatty acid ester that is liquid, a pigment, a dispersant, an alginide resin, and the vegetable oil-derived fatty acid ester that is liquid at room temperature. And after ejecting droplets of the treatment liquid and adhering to the recording medium, the droplets of the non-aqueous ink composition are ejected and adhered to the recording medium. An ink jet recording method for forming an image.
Preferred embodiments of the invention are as follows.
(2) The fatty acid ester derived from the vegetable oil 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. The inkjet recording method according to (1) above, which is a fatty acid ester represented by:
(3) 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. The ink jet recording method according to (1) or (2);
(4) The inkjet recording method according to any one of (1) to (3), wherein the vegetable oil-derived fatty acid ester is a fatty acid ester obtained by transesterifying vegetable oil with alcohol.
(5) The inkjet recording method according to (4), wherein the vegetable oil is selected from the group consisting of soybean oil, rapeseed oil, coconut oil, and coconut oil;
(6) said fatty acid ester derived from vegetable oil becomes contains 1 to 20% by weight relative to the total ink, the (1) an inkjet recording how according to any one of the - (5).

[Ink set]
As described above, the ink set of the present invention includes a treatment liquid containing a gelling agent, a fatty acid ester derived from vegetable oil, a pigment, a dispersant, a resin, and a fatty acid ester derived from vegetable oil. An aqueous ink composition.

  The ink set having such a configuration is excellent in fixability to a recording medium even when printing is performed using a recording medium having low absorbency. Therefore, the ink set of the present invention is also useful for a recording medium having an absorbent layer of a paper support with poor ink absorbability, such as plain paper and printing paper.

  In the present embodiment, “plain paper” generally refers to paper that uses pulp as a main raw material and is used in a printer or the like, and is defined by JIS P 0001 number 6139. Specific examples include high-quality paper, PPC copy paper, and non-coated printing paper. As the plain paper, those commercially available from various companies can be used. For example, various papers such as Xerox 4200 (manufactured by Xerox) and GeoCycle (Gerogia-Pacific) can be used.

In the present embodiment, “a recording medium having a paper support absorbing layer with poor ink absorption” means that the water absorption within 30 msec ^1/2 from the start of contact in the Bristow method is 30 ml / m ² or less. A recording medium having an absorption layer of a paper support. Further, in this embodiment, conventionally, any coated paper (also referred to as printing book paper) that has been used as a printing paper for letterpress printing, flat printing (for example, offset printing), or intaglio printing (for example, gravure printing). ) Can be used. This coated paper includes ordinary coated paper, cast coated paper, and matte coated paper. Also included are printing book paper defined by JIS P 0001 number 6122, OK topcoat paper defined by JIS P 0001 number 6059, and the like.

  A gelling agent is added to the treatment liquid for the purpose of causing the non-aqueous ink composition to be described later to gel on the recording medium when it is ejected in the form of a recording medium and fixing it to the recording medium. The gelling agent is preferably an aluminum chelate compound.

  Specific examples of the aluminum chelate compound include, for example, aluminum tris (ethyl acetonate), aluminum bisethyl acetoacetate monoacetyl acetate, aluminum monoacetyl acetonate bis (ethyl acetoacetate), aluminum tris (acetylacetonate) (aluminum acetyl) Also referred to as acetonate). Among these, aluminum bisethyl acetoacetate monoacetyl acetate is particularly preferably used.

  The addition amount of the gelling agent is preferably 1 to 20% by weight and more preferably 3 to 18% by weight in the treatment liquid.

  Fatty acid esters derived from vegetable oils are added to the treatment liquid because it has a low environmental impact and is excellent in ink reliability, and in particular, can achieve an ink with excellent printing quality for printing paper.

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

（式中、Ｒ₁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、Ｒ₂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 capric acid, caprylic acid, palmitic acid, lauric acid, oleic acid or myristic acid, methyl, ethyl, propyl, butyl, hexyl, 2-ethylhexyl, heptyl, octyl ester, respectively. Of these, 2-ethylhexyl caprate, 2-ethylhexyl caprylate, methyl laurate, propyl 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 embodiment, 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 treatment liquid is a fatty acid ester obtained by esterifying a fatty acid obtained by hydrolyzing vegetable fat with a known method using an alcohol, or a suitable fatty acid obtained from vegetable oil. The fatty acid ester obtained by transesterification (alcolysis) may be used alone, or a mixture of these two fatty acid esters can be used. In the present embodiment, it is preferable from the viewpoint of stability of physical properties to use a fatty acid ester obtained by esterifying a fatty acid obtained by hydrolyzing vegetable fat and oil, which is a single compound, with an alcohol by a known method. .

  Moreover, when using the mixture of 2 types of fatty acid ester, fatty acid ester (A) obtained by esterifying the fatty acid obtained by hydrolyzing vegetable fats and oils by alcohol by a well-known method, and vegetable fats and oils are used for suitable alcohol. The mixing ratio with the fatty acid ester (B) obtained by transesterification (alcolysis) is preferably A / B = 0 to 30/100 (weight ratio). When the blending ratio of the two types of fatty acid esters is within the above range, the occurrence of bleeding is suppressed even when solid printing or fine line printing is performed, and a high-density printed matter is obtained.

  Moreover, it is preferable that the vegetable oil origin fatty acid ester used for the said processing liquid is 1 to 95 weight% with respect to the whole processing liquid.

  The resin used in the non-aqueous ink composition is preferably an argide resin. The argide resin is added to react with the gelling agent contained in the treatment liquid to gel the non-aqueous ink composition discharged onto the recording medium and fix the image on the recording medium.

  The addition amount of the resin is preferably 5 to 15% by weight with respect to the whole ink.

  The pigment used in the non-aqueous ink composition is not particularly limited, and inorganic or organic pigments used in ordinary non-aqueous inks can be used. Examples of pigments include inorganic pigments such as carbon black, titanium oxide, bitumen, ultramarine, petal, zinc white and calcium carbonate, insoluble azo pigments such as benzidine yellow, hansa yellow and toluidine red, permanent red 2B, pigment scarlet, and 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 pigment is preferably 0.5 to 20% by weight with respect to the whole non-aqueous ink composition, and by setting the addition amount within this range, a desired color density can be obtained and the ink ejection Reliability such as stability is also improved.

  The non-aqueous ink composition used in the present embodiment includes 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.).

  Further, Demol RN, N (Naphthalenesulfonic acid 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.).

  The dispersant is preferably added in an amount of 0.5 to 10% by weight based on the total amount of ink, although it depends on the amount of pigment added. By setting it within this range, a stable ink composition can be obtained with little change in viscosity.

  The vegetable oil-derived fatty acid ester used in the non-aqueous ink composition may be the same as the vegetable oil-derived fatty acid ester used in the treatment agent described above. In addition, it is preferable that the fatty acid ester derived from vegetable oil used for the said non-aqueous ink composition is 1 to 90 weight% with respect to the whole processing liquid.

  The non-aqueous ink composition used in the present embodiment can be produced by dispersing and mixing each of the above components by an appropriate method. Preferably, a pigment, a dispersant and a fatty acid ester derived from vegetable oil are appropriately dispersed (for example, ball mill, sand mill, attritor, roll mill, agitator mill, Henschel mixer, colloid mill, ultrasonic homogenizer, jet mill, ang mill, etc.) To prepare a uniform pigment dispersion, and then add a pH adjuster, an antiseptic, an antifungal agent and the like to dissolve sufficiently 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 diameter and foreign matters that cause clogging.

[Inkjet recording method]
As described above, the inkjet recording method of the present invention is an inkjet recording method in which droplets of a treatment liquid and a non-aqueous ink composition are ejected, and the droplets are attached to a recording medium to form an image. The ink set is used.

  With such a configuration, excellent fixability can be obtained even when printing is performed on a recording medium having relatively low absorbency, such as printing paper or plain paper.

  When the treatment liquid and the non-aqueous ink composition are ejected onto a recording medium and both come into contact with each other, the gelling agent contained in the treatment agent and the resin contained in the non-aqueous ink composition react to form a gel. And fixed on the recording medium.

  The discharge order of the treatment liquid and the non-aqueous ink composition is not particularly limited, but from the viewpoint of fixability, after the droplets of the treatment liquid are discharged and adhered to the recording medium, the non-aqueous ink composition More preferably, the liquid droplets are ejected and adhered to the recording medium to form an image.

  In this way, the non-aqueous ink composition can be gelled more reliably by discharging the treatment liquid first and then discharging the non-aqueous ink composition.

  Note that the liquid processing liquid may be discharged over the entire printing surface of the recording medium or only in a region where an image is formed (a region where the non-aqueous ink composition is discharged).

  The ink set described above can be suitably used as an ink set for recording on a recording medium by an ink jet recording method. In the present embodiment, the inkjet recording system means a system in which an ink composition is ejected as droplets from a fine nozzle by an inkjet recording apparatus, and the droplets are attached to a recording medium. This will be specifically described below.

  As a first method, there is an electrostatic suction method, which applies a strong electric field between the nozzle and the acceleration electrode placed in front of the nozzle, and continuously ejects ink from the nozzle in the form of droplets. This is a method in which a print information signal is applied to the deflection electrode while the ink droplet is flying between the deflection electrodes and recorded, or a method in which the ink droplet is ejected corresponding to the print information signal without being deflected.

  The second method is a method in which ink droplets are forcibly ejected by applying pressure to the ink liquid with a small pump and mechanically vibrating the nozzle with a crystal resonator or the like. The ejected ink droplet is charged simultaneously with the ejection, and a printing information signal is given to the deflection electrode and recorded while the ink droplet flies between the deflection electrodes.

  The third method is a method using a piezoelectric element, in which a pressure and a print information signal are simultaneously applied to an ink liquid by a piezoelectric element to eject and record ink droplets.

  The fourth method is a method in which the ink liquid is rapidly expanded in volume by the action of heat energy, and the ink liquid is heated and foamed with a microelectrode in accordance with a print information signal to eject and record ink droplets.

  Any of the above methods can be used in the ink jet recording method of this embodiment.

  According to the ink jet recording method of the present embodiment, by using the above-described ink set, the ink jet recording apparatus that has been used conventionally can be used as it is without providing any additional equipment, and has a low water absorption as a recording medium. Even in the case of using a recording medium with good characteristics, it is possible to obtain a recorded matter with excellent fixing properties.

[Recordings]
The recorded matter of the present embodiment is recorded on a recording medium using at least the above-described ink set and inkjet recording method. By using the ink set and the ink jet recording method described above, this recorded matter can be used as it is without providing additional equipment to the ink jet recording apparatus that has been used conventionally, and also has a low water absorption as a recording medium. Even when a recording medium is used, a recorded matter having excellent fixability can be obtained.

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

1. Preparation of Non-Aqueous Ink Composition and Treatment Liquid (1) Non-aqueous Ink Composition According to the composition shown in Table 1 below, each component was added so that the total amount was 100% by weight and 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 a non-aqueous ink composition.

  In Table 1, “dispersing agent” means Solsperse 28000 (manufactured by Abyssia) which is a polyester-based dispersing agent, “coloring agent” means carbon black MA-8 (manufactured by Mitsubishi Chemical Corporation), and “vegetable oil” “Derived fatty acid ester” means 2-ethylhexyl caprate, and “resin” means an argide resin (molecular weight 5000). Moreover, all the numerical values in Table 1 indicate% by weight.

(2) Treatment liquid According to the composition shown in Table 2 below, each component was added so that the total amount would be 100% by weight, and the treatment liquid was prepared by stirring. In Table 2, “gelling agent” means aluminum bisethylacetoacetate monoacetylacetonate (manufactured by Kawaken Fine Chemical Co., Ltd.), and “vegetable oil-derived fatty acid ester” means 2-ethylhexyl caprate. Moreover, all the numerical values in Table 2 indicate weight%.

2. Evaluation Test (1) Printing Method An ink set was constructed by appropriately combining the non-aqueous ink composition prepared as described above and a treatment liquid. An ink jet printer PX-A550 (manufactured by Seiko Epson Corporation) was used as a recording medium, and a 100% duty patch pattern was prepared. As recording media, OK top coat N (produced by Oji Paper Co., Ltd.), which is a type of printing paper, and Xerox P (produced by Fuji Xerox) and Xerox 4024 (produced by Xerox), which are types of plain paper, were used. Then, each evaluation test described later was performed using the obtained patch pattern as a sample.

(2) Evaluation of optical density (OD value) The OD value of the patch portion was measured using a Gretag densitometer (manufactured by Gretag Macbeth). And the average value for every sample was calculated | required and the optical density value (OD value) was evaluated by the following evaluation criteria about the calculated average OD value. The results are shown in Table 3.
A: OD value is 1.2 or more B: OD value is 1.0 or more and less than 0.9 C: OD value is less than 0.9

(3) Evaluation of printing quality The image quality of each sample was visually observed and evaluated according to the following evaluation criteria. The results are shown in Table 3.
A: Color development is good and no color unevenness is observed. B: Color unevenness is slightly observed, but there is no practical problem. C: Color unevenness is conspicuous and impractical.

(4) Fixability (dryness)
After printing, each sample was naturally dried day and night, and then the printed portion of the sample was rubbed with a finger to visually observe the state of the printed surface and the ink attached to the finger. The results were evaluated based on the following criteria. The results are shown in Table 3.
A: The printing surface does not change, and ink does not adhere to the finger. B: The ink on the printing surface slightly drops, but the ink does not adhere to the finger. C: The ink on the printing surface drops, and the ink adheres to the finger.

Claims (6)

An inkjet recording method of forming an image by discharging droplets of a treatment liquid and a non-aqueous ink composition and attaching the droplets to a recording medium,
The treatment liquid comprising an aluminum chelate compound as a gelling agent, and a fatty acid ester derived from vegetable oil that is liquid at room temperature; and
The non-aqueous ink composition comprising a pigment, a dispersant, an argide resin, and a fatty acid ester derived from vegetable oil that is liquid at room temperature;
And using an ink set with
An ink jet recording method, wherein droplets of the treatment liquid are ejected and adhered to the recording medium, and then droplets of the non-aqueous ink composition are ejected and adhered to the recording medium to form an image. 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 inkjet recording method according to claim 1, wherein the fatty acid ester is represented by the formula:   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. The inkjet recording method according to 1 or 2.   The inkjet recording method according to any one of claims 1 to 3, wherein the vegetable oil-derived fatty acid ester is a fatty acid ester obtained by transesterifying vegetable oil with alcohol.   The inkjet recording method according to claim 4, wherein the vegetable oil is selected from the group consisting of soybean oil, rapeseed oil, coconut oil, and coconut oil.   The inkjet recording method according to any one of claims 1 to 5, wherein the vegetable oil-derived fatty acid ester is contained in an amount of 1 to 20% by weight based on the whole ink.