JP5684508B2 - Ink jet ink composition - Google Patents

Description

  The present invention relates to an ink-jet ink composition containing a developer for carbonless copying paper.

  Carbonless copy paper consists of an upper paper having a microcapsule layer encapsulating a color former on the back surface and a lower paper having a color developer layer on the surface when contacting with the color former. It is a paper that is stacked so that the two layers face each other. Due to the writing pressure or printing pressure, the microcapsule is broken, and the color former and the developer that have been encapsulated react to develop color. Further, by using a medium sheet provided with a developer layer on the front surface and a microcapsule layer containing a color former on the back surface, a plurality of sheets can be copied simultaneously.

  Carbonless copy paper is widely used for forms and the like. Form printing of forms and the like is performed by various methods such as an offset method and a relief printing method, but in recent years, it has been frequently performed by an ink jet recording method.

  In addition, when the developer is applied to the entire surface, the desensitizing ink must be printed on the color development unnecessary portion, and the manufacturing process is complicated. Therefore, by printing the developer only on a necessary area on the surface, it is possible to manufacture the lower sheet or the like by a simpler process without using desensitizing ink. For example, Patent Document 1 discloses a developer ink for carbonless paper capable of forming a developer layer by letterpress printing or offset printing. The carbonless copy paper with the developer layer formed in this way is not coated with a developer on the form printing part such as a form. Therefore, even when the form printing is performed by a normal ink jet recording method, It is possible to obtain a good recorded image without problems such as property.

JP-A-6-346011

  Letterpress printing and offset printing require platemaking, and are inferior in economical efficiency of small lot printing. In contrast, inkjet printing does not require plate making, and can be printed in a relatively short period of time. The degree of freedom for changing the form is great, and is optimal for small lot printing. However, until now, no ink for ink jet that can form a developer layer by an ink jet recording method has been developed.

  Accordingly, an object of the present invention is to provide an ink-jet ink composition for forming a developer layer of carbonless copying paper by an ink-jet recording method.

In order to solve this problem, the present invention firstly includes a salicylic acid developer, a water-soluble organic solvent, and water, wherein the salicylic acid developer is dissolved, and the salicylic acid developer 3,5-di (α-methylbenzyl) salicylic acid zinc salt, zinc salicylate trihydrate, 3- (α-methylbenzyl) -5- (α, α-dimethylbenzyl) salicylic acid zinc salt, and 3,5 -1-type or 2 or more types selected from the group consisting of di- (α, α-dimethylbenzyl) salicylic acid zinc salt, and the content of the salicylic acid developer is 1% by mass or more An ink-jet ink composition is provided.
In the present invention, secondly , the water-soluble organic solvent is one or more selected from the group consisting of alcohols, polyhydric alcohols, ketones, ethers, esters, and glycol ethers. The first ink-jet ink composition is provided.
Thirdly , the present invention provides the first or second inkjet ink composition, wherein the salicylic acid developer is contained in an amount of 1 to 50% by mass.
Fourth , the salicylic acid developer is one or more selected from the group consisting of 3,5-di ( α-methylbenzyl ) salicylic acid zinc salt and zinc salicylate trihydrate, The first ink-jet ink composition is provided wherein the water-soluble organic solvent is at least one selected from the group consisting of ethanol, polyethylene glycol, triethylene glycol monobutyl ether, and diethylene glycol ethyl methyl ether.
Fifthly, the present invention provides the ink composition for inkjet according to any one of the first to fourth , which does not contain a colorant.
Sixth , the present invention provides a recorded matter recorded by an ink jet recording method using any one of the first to fifth ink jet ink compositions.

  By using the ink-jet ink composition of the present invention, a developer can be used on the surface of the lower paper or the middle paper of a carbonless copy paper simply and using a general ink-jet printer without using desensitizing ink. A layer can be formed.

The present invention will be described in detail below.
The inkjet ink composition of the present invention contains a salicylic acid developer, a water-soluble organic solvent, and water, the salicylic acid developer is dissolved, and the content of the salicylic acid developer is It is 1 mass% or more. In the inkjet ink composition of the present invention, since the salicylic acid developer is dissolved in the liquid medium, nozzle clogging is unlikely to occur and the ink composition of the inkjet printer is very suitable.

  The salicylic acid-based developer used in the inkjet ink composition of the present invention may be a developer composed of salicylic acid or a derivative thereof, and is preferably a polyvalent metal salt of salicylic acid or a derivative thereof. Moreover, the ink composition for inkjet of the present invention may contain one type of salicylic acid developer or may contain two or more salicylic acid developers.

Examples of the salicylic acid derivative include 3- (α-methylbenzyl) salicylic acid, 5- (α-methylbenzyl) salicylic acid, 3- (α, α-dimethylbenzyl) salicylic acid, and 5- (α, α-dimethylbenzyl) salicylic acid. 3,5-bis (α-methylbenzyl) salicylic acid, 3- (α-methylbenzyl) -5- (α, α-dimethylbenzyl) salicylic acid, 3,5-bis (α, α-dimethylbenzyl) salicylic acid, 3,5-bis {α-methyl (paramethylbenzyl) salicylic acid, 3-α-methylbenzyl-5- (1,3-diphenylbutyl) salicylic acid, 3- (1,3-diphenylbutyl) -5-α- Methylbenzylsalicylic acid, 3-α, α-dimethylbenzyl-5- (1,3-dimethyl-1,3-phenylbutyl) salicylic acid, 3- (1,3-dimethyl-1) , 3-diphenylbutyl) -5-α, α-dimethylbenzylsalicylic acid, 3- {1- (4-methylphenyl) ethyl-5- {1,3-bis (4-methylphenyl) butyl} salicylic acid, 3- {1- (4-methylphenyl) ethyl-5- {1,3-bis (4-methylphenyl) butyl} salicylic acid, or 3- {1,3-bis (4-methylphenyl) butyl) -5- { 1- (4-methylphenyl) ethyl} salicylic acid and the like. Examples of the polyvalent metal of the polyvalent metal salt include divalent or higher metals such as zinc, nickel, cobalt, copper, magnesium, barium, aluminum, zirconium, vanadium, tin, lead, and calcium. In the inkjet ink composition of the present invention, a zinc salt of salicylic acid or a derivative thereof is preferable, and 3,5-di ( α-methylbenzyl ) salicylic acid zinc salt, zinc salicylate anhydrous, zinc salicylate dihydrate. , Zinc salicylate trihydrate, 3- (α-methylbenzyl) -5- (α, α-dimethylbenzyl) salicylic acid zinc salt, and 3,5-di- (α, α-dimethylbenzyl) salicylic acid zinc salt More preferably, it is one or more selected from the group consisting of one or more selected from the group consisting of 3,5-di ( α-methylbenzyl ) salicylic acid zinc salt and zinc salicylate trihydrate. More preferably.

  The content of the salicylic acid developer in the inkjet ink composition of the present invention is completely dissolved in the inkjet ink composition, and an inkjet printer using the inkjet ink composition The carbonless copy paper including the lower paper or the middle paper on which the developer layer is formed by recording the color developer can develop the color developer with normal writing pressure or printing pressure (that is, exhibit the color developing ability). The concentration can be determined as appropriate, and can be appropriately determined in consideration of the type of salicylic acid developer, the type and concentration of the water-soluble organic solvent, the desired product characteristics of carbonless copying paper, and the like.

  When the content of the salicylic acid developer is too small, color development tends to be insufficient when reacted with the color former. For example, the content of the salicylic acid developer in the inkjet ink composition of the present invention is preferably 1% by mass or more, more preferably 5% by mass or more, and more preferably 10% by mass or more. Is more preferable, and it is especially preferable that it is 15 mass% or more. On the other hand, when the content of the salicylic acid developer is too large, the water-soluble organic solvent and other components for providing the characteristics as an ink-jet ink composition such as a wetting agent should be sufficiently blended. However, depending on the type of salicylic acid developer, it may be difficult to maintain a dissolved state. For this reason, for example, the content of the salicylic acid developer in the inkjet ink composition of the present invention is preferably 50% by mass or less, more preferably 40% by mass or less, and 30% by mass or less. More preferably, it is particularly preferably 25% by mass or less.

  In the inkjet ink composition of the present invention, the water-soluble organic solvent is added to improve the solubility of the salicylic acid-based developer having low solubility in water. In addition, wetting agents generally added to inkjet inks to adjust viscosity and prevent ink drying, and to improve penetration into recording media and to adjust dot diameter on recording media. It also functions as a penetrant.

  The water-soluble organic solvent used in the ink-jet ink composition of the present invention is selected from known water-soluble organic solvents such as the solubility of the salicylic acid developer used and the viscosity of the resulting ink-jet ink composition. Etc. can be appropriately selected and used. Moreover, the ink composition for inkjet of this invention may contain one type of water-soluble organic solvent, and may contain two or more types of water-soluble organic solvents.

Specifically, as the water-soluble organic solvent, for example,
Methanol, ethanol, 1-propanol, 2-propanol, 2-methyl-1-propanol, 1-butanol, 2-butanol, pentyl alcohol, 2-methoxyethanol, 2-butoxyethanol, 2- (2-methoxyethoxy) ethanol 2- (2-butoxyethoxy) ethanol, 2- [2- (2-methoxyethoxy) ethoxy] ethanol, 2- [2- (2-butoxyethoxy) ethoxy] ethanol, 1-methyl-1-methoxybutanol, etc. Alcohols;
2-ethanediol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-propanediol, 1,4-butanediol, 2,3-butanediol, 1,2, -Pentanediol, 1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, 2,2'-oxybisethanol, 2,2'-ethylenedioxybis (ethanol), thiodiethanol, Polyhydric alcohols such as glycerin, 1,2,6-hexanetriol, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, trimethylolpropane, pentaerythritol;
Ketones such as acetone, methyl ethyl ketone, methyl n-butyl ketone, methyl isobutyl ketone;
Tetrahydrofuran, 1,4-dioxane, 1,2-dimethoxyethane, 1,2-diethoxyethane, 2,2′-oxybis (2-methoxyethane), 2,2′-oxybis (2-ethoxyethane), 2 Ethers such as 2,2′-ethylenedioxybis (2-methoxyethane) and 2,2′-ethylenedioxybis (2-methoxyethane);
Glycol esters such as propylene glycol laurate;
Ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol mono-iso-propyl ether, ethylene glycol mono-n-butyl ether, ethylene glycol mono-iso-butyl ether, ethylene glycol mono-tert-butyl ether, diethylene glycol monomethyl ether, diethylene glycol mono Ethyl ether, diethylene glycol mono-n-propyl ether, diethylene glycol mono-iso-propyl ether (diethylene glycol ethyl methyl ether), diethylene glycol mono-n-butyl ether, diethylene glycol mono-tert-butyl ether, diethylene glycol monohexyl ether, triethylene glycol monomethyl ether Ter, triethylene glycol monoethyl ether, triethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol mono-n-propyl ether, propylene glycol mono-iso-propyl ether, propylene glycol mono-n- Butyl ether, propylene glycol mono-tert-butyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol mono-n-propyl ether, dipropylene glycol mono-iso-propyl ether, dipropylene glycol mono-n -Glycol such as butyl ether, dipropylene glycol mono-tert-butyl ether Over ethers;
Alkylene oxide adducts of alkyl alcohols such as ethylene oxide hexyl ether and ethylene glycol butyl ether ethylene oxide adducts and propylene glycol propyl ether propylene oxide adducts;
Amides such as dimethylformamide, dimethylacetamide, N-methyl-pyrrolidone, 1,3-dimethyl-2-imidazolidinone;
Alcohol amines such as methyldiethanolamine and triethanolamine;
Lactones such as γ-butyrolactone;
Sulfones such as sulfolane and dimethyl sulfoxide;
Lactams such as 2-pyrrolidone, N-methyl-2-pyrrolidone, ε-caprolactam, N- (2-hydroxyethyl) pyrrolidone;
1,3-dimethylimidazolidinone and the like can be mentioned.

  The inkjet ink composition of the present invention may be one or more selected from the group consisting of alcohols, polyhydric alcohols, ketones, ethers, esters, and glycol ethers. Preferably, it is one or more selected from the group consisting of alcohols, polyhydric alcohols, and glycol ethers.

  The content of the water-soluble organic solvent in the inkjet ink composition of the present invention is determined in consideration of the solubility of the salicylic acid developer, the combination of the water-soluble organic solvent used, the characteristics of the resulting inkjet ink composition, and the like. It can be determined as appropriate. For example, when the inkjet ink composition of the present invention contains alcohols, the alcohol content is preferably 0.1 to 10% by mass. Moreover, when the inkjet ink composition of this invention contains polyhydric alcohols, such as polyethyleneglycol, it is preferable that content of a polyhydric alcohol is 0.1-30 mass%. Moreover, when the ink composition for inkjet of this invention contains glycol ethers, it is preferable that content of glycol ethers is 0.1-50 mass%.

  The water used in the present invention is not particularly specified in properties, but preferably has few impurities and does not adversely affect the quality of the inkjet ink composition. As such water, industrially known and commonly used water such as Japanese Pharmacopoeia purified water, ion exchange water, distilled water and pure water is preferable. For example, the water content in the inkjet ink composition of the present invention can be 5 to 90 masses.

  The viscosity of the inkjet ink composition of the present invention is not particularly limited as long as it is within the range required for inkjet, and can be set to 1 to 100 mPa · s, for example.

When using 3,5-di ( α-methylbenzyl ) salicylic acid zinc salt and / or zinc salicylic acid trihydrate as a salicylic acid developer, use a combination of alcohols and glycol ethers as water-soluble organic solvents. It is more preferable to use a lower alcohol having 1 to 4 carbon atoms in combination with a dialkylene glycol alkyl ether and / or a trialkylene glycol alkyl ether, and it is more preferable to use a combination of ethanol and diethylene glycol ethyl methyl ether. preferable. Specifically, the total of 3,5-di ( α-methylbenzyl ) salicylic acid zinc salt and zinc salicylate trihydrate (which may not contain any one) is 1 to 50% by mass, Preferably 10-25% by weight, ethanol 0.1-10% by weight, preferably 5-10% by weight, diethylene glycol ethyl methyl ether 0.1-50% by weight, preferably 15-25% by weight, and water The ink-jet ink composition of the present invention can be produced by mixing in an amount of 5 to 90% by mass, preferably 40 to 65% by mass.

When 3,5-di ( α-methylbenzyl ) salicylic acid zinc salt and / or zinc salicylate trihydrate is used as a salicylic acid developer, alcohols, polyhydric alcohols and glycol ethers are used as water-soluble organic solvents. It is also preferable to use a combination of the lower alcohol having 1 to 4 carbon atoms, the alkylene glycol, and the dialkylene glycol alkyl ether and / or the trialkylene glycol alkyl ether. More preferably, it is used in combination with triethylene glycol monobutyl ether. Specifically, the total of 3,5-di ( α-methylbenzyl ) salicylic acid zinc salt and zinc salicylate trihydrate (which may not contain any one) is 1 to 50% by mass, Preferably 10 to 17.5% by mass, ethanol 0.1 to 10% by mass, preferably 5 to 10% by mass, polyethylene glycol 0.1 to 30% by mass, preferably 10 to 20% by mass, triethylene glycol The ink-jet ink of the present invention is mixed by mixing so that monobutyl ether is 0.1 to 50% by mass, preferably 3 to 15% by mass, and water is 5 to 90% by mass, preferably 40 to 65% by mass. A composition can be produced.

When 3,5-di ( α-methylbenzyl ) salicylic acid zinc salt and / or zinc salicylate trihydrate is used as the salicylic acid developer, it is also preferable to use only glycol ethers as the water-soluble organic solvent. It is more preferable to use glycol alkyl ether and / or trialkylene glycol alkyl ether, and it is more preferable to use diethylene glycol ethyl methyl ether and triethylene glycol monobutyl ether alone or in combination. Specifically, the total of 3,5-di ( α-methylbenzyl ) salicylic acid zinc salt and zinc salicylate trihydrate (which may not contain any one) is 1 to 50% by mass, Preferably 15 to 25% by weight, diethylene glycol ethyl methyl ether 0.1 to 50% by weight, preferably 20 to 30% by weight, and water 5 to 90% by weight, preferably 40 to 65% by weight. By doing so, the ink-jet ink composition of the present invention can be produced.

  One or more surfactants are added to the inkjet ink composition of the present invention in order to adjust the ink properties such as surface tension as long as the dissolved state of the salicylic acid developer can be maintained. can do. The surfactant that can be added for this purpose is not particularly limited, and examples thereof include various anionic surfactants, nonionic surfactants, cationic surfactants, and amphoteric surfactants. In the present invention, it is preferable to use one or more selected from the group consisting of an anionic surfactant and a nonionic surfactant.

  Examples of the anionic surfactant include alkylbenzene sulfonate, alkylphenyl sulfonate, alkylnaphthalene sulfonate, higher fatty acid salt, alkyl sulfate ester salt, alkyl sulfonate ester salt, sulfate ester salt of higher alcohol ether and Examples thereof include sulfonates, higher alkyl sulfosuccinates, polyoxyethylene alkyl ether carboxylates, polyoxyethylene alkyl ether sulfates, alkyl phosphates, polyoxyethylene alkyl ether phosphates, and the like. In the present invention, among others, higher fatty acid salt, alkyl sulfate ester salt, alkylbenzene sulfonate, alkyl naphthalene sulfonate, dialkyl sulfosuccinate, alkyl phosphate ester salt, naphthalene sulfonate formalin condensate, or polyoxyethylene alkyl Sulfuric acid ester salts are preferred.

  Nonionic surfactants include, for example, polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, polyoxyethylene fatty acid ester, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbitol fatty acid ester, glycerin fatty acid ester , Polyoxyethylene glycerin fatty acid ester, polyglycerin fatty acid ester, sucrose fatty acid ester, polyoxyethylene alkylamine, polyoxyethylene fatty acid amide, fatty acid alkylolamide, alkyl alkanolamide, acetylene glycol, oxyethylene adduct of acetylene glycol, Oxyethyleneoxypropylene block copolymer, polyethylene glycol polypropylene glycol Like the Lumpur block copolymer and the like. In the present invention, among others, polyoxyethylene alkyl ether, polyoxyethylene alkyl allyl ether, polyoxyethylene fatty acid ester, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene alkylamine, glycerin fatty acid ester, or oxyethylene Oxypropylene block copolymers are preferred. In addition, SURFYNOLS (manufactured by Air Products & Chemicals), which is an acetylene-based polyoxyethylene oxide surfactant, can also be used.

  The amphoteric surfactant may be a betaine type surfactant or an amine oxide type surfactant. Examples of the amine oxide surfactant include N, N-dimethyl-N-alkylamine oxide.

  Other surfactants include silicone surfactants such as polysiloxane oxyethylene adducts; fluorine surfactants such as perfluoroalkyl carboxylates, perfluoroalkyl sulfonates, and oxyethylene perfluoroalkyl ethers. Biosurfactants such as spicrispolic acid, rhamnolipid, lysolecithin and the like can also be used. These surfactants can be used alone or in combination of two or more. In consideration of the dissolution stability of the surfactant, the HLB is preferably in the range of 7-20.

  When the surfactant is added, the addition amount is preferably in the range of 0.001 to 1% by mass, more preferably 0.001 to 0.5% by mass, based on the total mass of the ink. More preferably, it is in the range of 01 to 0.2% by mass. When the addition amount of the surfactant is less than 0.001% by mass, the effect of adding the surfactant tends to be not obtained, and when it exceeds 1% by mass, problems such as blurring of the image are likely to occur. .

  In addition to the ink composition for inkjet of the present invention, various additives for imparting properties suitable for inkjet applications may be added as long as the salicylic acid developer can be maintained in a dissolved state. it can. Examples of such additives include pH adjusters, preservatives and fungicides, chelating agents, plasticizers, antioxidants, and ultraviolet absorbers.

  As the pH adjuster added to the ink-jet ink composition of the present invention, an organic base, an inorganic alkali, or the like can be used as a basic one, and an organic acid, an inorganic acid, or the like can be used as an acidic one. Examples of the organic base include triethanolamine, diethanolamine, N-methyldiethanolamine, and dimethylethanolamine. Examples of the inorganic alkali include sodium hydroxide, lithium hydroxide, potassium hydroxide, sodium carbonate, sodium hydrogen carbonate, ammonium and the like. Examples of the organic acid include acetic acid, propionic acid, trifluoroacetic acid, and alkylsulfonic acid. Examples of the inorganic acid include hydrochloric acid, sulfuric acid, phosphoric acid and the like. For the purpose of improving the storage stability of the inkjet ink composition, the pH adjuster is preferably added so that the inkjet ink composition has a pH of 4 to 10, and added to have a pH of 4 to 8. More preferably.

  Examples of the preservative and fungicide added to the inkjet ink composition of the present invention include sodium benzoate, sodium pentachlorophenol, sodium 2-pyridinethiol-1-oxide, sodium sorbate, and sodium dehydroacetate. 1,2-dibenzthiazolin-3-one and the like. These compounds are commercially available, for example, as Proxel CRL, Proxel BND, Proxel GXL, Proxel XL-2, Proxel TN (all manufactured by ICI) and the like.

  The inkjet ink composition of the present invention is suitable for forming a developer layer of carbonless copying paper, and may contain a colorant, but does not contain a colorant. Preferably there is. For example, when a light-colored dye or the like is included as a colorant, the formed developer layer is lightly colored. The color density of this developer layer is utilized for the concentration control of the salicylic acid developer in the developer layer, or the copied characters are highlighted by coloring the developer layer with the opposite color of the color developer. In addition, effects equivalent to universal design can be obtained.

  The inkjet ink composition of the present invention is prepared by mixing and dissolving a salicylic acid developer, a water-soluble organic solvent, water, and other components as necessary, and then removing impurities and the like by filtration or the like. Obtained by. In order to dissolve the salicylic acid developer, stirring and mixing may be performed while heating at 30 to 50 ° C.

  The inkjet ink composition of the present invention can be suitably used as an inkjet recording ink. The ink jet method to be applied is not particularly limited, but examples of known ones such as a continuous jet type (charge control type, spray type, etc.), on-demand type (piezo type, thermal type, electrostatic suction type, etc.) can do.

  The developer layer of carbonless copying paper can be formed by printing the inkjet ink composition of the present invention on a recording material such as paper using an inkjet printer. The carbonless copy paper provided with the developer layer formed as described above can be copied with a normal writing pressure or printing pressure.

  EXAMPLES Hereinafter, although this invention is shown concretely using an Example, this invention is not limited to a following example etc. In these examples, “part” means mass part, and “%” means mass percent.

[Examples 1 to 12, Comparative Examples 1 to 5]
Zinc salicylate trihydrate or 3,5-di ( α-methylbenzyl ) salicylic acid zinc salt as a salicylic acid developer, ethanol, polyethylene glycol (average molecular weight of about 600), triethylene glycol monobutyl ether as a water-soluble organic solvent Or the ink composition for inkjets of this invention was manufactured using diethylene glycol ethyl methyl ether.
First, ink jet ink compositions were obtained according to the compositions shown in Tables 1 to 3. Specifically, after all raw materials other than water are mixed and stirred, water is added, and the mixture is stirred and mixed while heating at 40 ° C., so that zinc salicylate trihydrate or 3,5-di ( α -Methylbenzyl ) salicylic acid zinc salt was dissolved. After dissolution, in order to remove impurities such as dust, it was filtered with a syringe filter having a pore diameter of 0.5 μm.

The resulting ink-jet ink composition was evaluated for solubility, color development, color development speed, and IJ ejection performance in five stages (5: excellent, 4: good, 3: normal, 2: slightly inferior, 1: inferior). . Each evaluation standard is shown below.
Solubility evaluation: Visual determination of the state after dissolution.
Evaluation of color developability: A developer is applied to IJ paper with a bar coater, and after drying, a carbonless top paper is overlaid and developed with writing pressure. Visual evaluation of color development.
Color development rate evaluation: A developer is applied to IJ paper with a bar coater, and after drying, carbonless top paper is overlaid and colored with a writing pressure. Visual evaluation of color development speed.
IJ ejection performance evaluation: IJ head filled with developer and printed on IJ paper. Visual judgment of printing status.

As a result, the inkjet ink compositions of Examples 1 to 12 in which zinc salicylate trihydrate and 3,5-di ( α-methylbenzyl ) salicylic acid zinc salt were sufficiently dissolved were comparative examples inferior in solubility. Compared with 1 to 3 and 5, all of color developability, color development speed, and IJ discharge performance were good. Further, as the content of zinc salicylate trihydrate or 3,5-di ( α-methylbenzyl ) salicylic acid zinc salt increased, the color developability and color development rate were better.
On the other hand, the ink composition for inkjet of Comparative Example 4 in which the content of the salicylic acid developer was less than 1% was excellent in solubility, but inferior in color development, color development speed, and IJ ejection performance. It was.

  The ink-jet ink composition of the present invention can be widely applied to the production of carbonless copying paper because the developer layer of carbonless copying paper can be formed by the ink jet recording method.

Claims (6)

A salicylic acid developer, a water-soluble organic solvent, and water, wherein the salicylic acid developer is dissolved, and the salicylic acid developer is 3,5-di (α-methylbenzyl) salicylic acid zinc salt , Zinc salicylate trihydrate, 3- (α-methylbenzyl) -5- (α, α-dimethylbenzyl) salicylic acid zinc salt, and 3,5-di- (α, α-dimethylbenzyl) salicylic acid zinc salt An ink-jet ink composition comprising one or more selected from the group consisting of the salicylic acid developer and 1% by mass or more. Wherein the water-soluble organic solvent, alcohols, polyhydric alcohols, ketones, ethers, esters, and glycosides - according to claim 1 is one or more selected from the group consisting of ethers Ink-jet ink composition. The inkjet ink composition according to claim 1 or 2 , wherein a content of the salicylic acid developer is 1 to 50% by mass. The salicylic acid developer is at least one selected from the group consisting of 3,5-di ( α-methylbenzyl ) salicylic acid zinc salt and zinc salicylate trihydrate, and the water-soluble organic solvent is ethanol, The inkjet ink composition according to claim 1, wherein the ink composition is at least one selected from the group consisting of polyethylene glycol, triethylene glycol monobutyl ether, and diethylene glycol ethyl methyl ether. The ink composition for inkjet according to any one of claims 1 to 4 , which does not contain a colorant. A recorded matter recorded by an ink jet recording method using the ink composition for ink jet according to any one of claims 1 to 5 .