JP2003192966A - Water-based, ink-jet printing ink composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pigment-based and water-based, ink-jet printing ink composition which has water resistance and weatherability and also is excellent in print quality such as blurrilessness equal or superior to a dyestuff-based one and as clearness and in drying characteristics. <P>SOLUTION: The water-based ink-jet printing ink composition comprising mainly a pigment, a water-based resin, a basic compound and a water-based medium, is characterized in that the ink composition contains additionally an alkylene oxide adduct of 2-butyl-2-ethyl-1,3-propanediol; and the water-based ink-jet printing ink composition is characterized in that the amount used of the above alkylene oxide adduct of 2-butyl-2-ethyl-1,3-propanediol is 0.1-5 wt.% relative to the ink composition; and also the water-based ink-jet printing ink composition is characterized in that the above alkylene oxide adduct of 2- butyl-2-ethyl-1,3-propanediol has an added molar number of 2-50. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a pigment-based aqueous inkjet ink composition.

[0002]

2. Description of the Related Art Non-aqueous ink compositions and water-based ink compositions have been used. Among them, water-based ink compositions for ink jet have less odor and toxicity and are excellent in safety such as flammability. Because
Various studies have been made to improve various physical properties.

For example, in the case of dye-based aqueous ink jet ink compositions, various surfactants are used in order to improve the drying property in JP-A-55-16042 and JP-A-55-29546. However, this method is not satisfactory because the ink penetrates too much into the paper, causing problems such as bleeding and sharpness, which deteriorates the printing characteristics. Further, when a water-soluble dye is used, a dye having a high solubility in water is often used for the stability of the ink, and the water resistance of an image recorded by an ink jet becomes low, and bleeding easily occurs when water is applied. There is also a problem in water resistance and weather resistance. From this point of view, it is better to use a pigment as the colorant.

However, when a pigment is used in an aqueous ink jet ink composition, there is a fundamental problem that the dispersibility is low. To solve the problem, when a dispersant such as an aqueous resin is used, dye-based ink jet recording is performed. As compared with the ink composition, there are problems such as slow drying. Therefore, it is difficult to simultaneously satisfy the contradictory characteristics such as printability such as bleeding and sharpness, and the drying property, water resistance and weather resistance of the recorded matter, which has not been realized by the prior art.

Further, since the transfer characteristics to the recording paper are different depending on the kind of the recording paper, when the conventional ink composition for ink jet is used, stable printing characteristics cannot be obtained, and the printable recording paper is used as an image object. There is a problem that it is limited according to. For example, the special paper has good printing characteristics such as bleeding and sharpness, but there are serious problems in the reduction of the printing speed and the cost of the special paper itself. On the other hand, with plain paper, although there is no problem in terms of cost, bleeding,
There is a new problem that the printing characteristics such as sharpness deteriorate. Therefore, printing characteristics such as bleeding and sharpness,
At present, it is not possible to satisfy contradictory properties such as dryness at the same time.

[0006]

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to obtain a bleeding having excellent water resistance and weather resistance of a recorded matter which is an advantage of a pigment-based water-based inkjet ink, and has a bleeding equal to or higher than that of a dye-based ink. Printing quality, such as
Another object of the present invention is to provide a pigment-based water-based inkjet ink composition having excellent dryness and the like.

[0007]

As a result of intensive studies, the present inventors have found that a pigment-based aqueous ink-jet ink composition is
By including a specific compound in the ink,
The inventors have found that the dryness and print quality of printed matter are good, and have completed the present invention.

That is, the present invention provides an aqueous ink jet ink composition mainly composed of a pigment, an aqueous resin and an aqueous medium, which is 2-butyl-2-ethyl-1,3.
The present invention relates to a water-based inkjet ink composition containing an alkylene oxide adduct of propanediol.

Furthermore, the content of the alkylene oxide adduct of 2-butyl-2-ethyl-1,3-propanediol described above is 0.1 to 5% by weight in the ink composition. The present invention relates to a water-based inkjet ink composition.

Further, the present invention relates to an aqueous ink-jet ink composition, wherein the added alkylene oxide adduct of 2-butyl-2-ethyl-1,3-propanediol has an addition mole number of 2 to 50. Is.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail below.

As the pigment used in the aqueous ink jet ink composition of the present invention, various inorganic and organic pigments that can be used in general ink jet recording inks can be used. I. Pigment Yellow 93, 95, 109, 110, 120, 12
8, 138, 151, 154, 155, 173, 18
0,185,193, C.I. I. Pigment Orange 3
4, 36, 43, 61, 71, C.I. I. Pigment Red 122, 202, a solid solution of 122 and 202, C.I. I.
Pigment Blue 15, C.I. I. Pigment Violet 19, 23, 33, C.I. I. Pigment Black 7 and the like.

In the ink jet recording system, yellow,
Based on four colors of magenta, cyan, and black, recently, a color image and the like are formed by using six colors of ink including orange and green, and eight colors of light magenta and light blue. In order to obtain these hues, among the above-mentioned pigments, those having good light resistance are preferable, and among them, as yellow, C.I. I.
Pigment Yellow 138, 154, 180, 185,
As magenta, C.I. I. Pigment Red 122,
202, C.I. I. Pigment Violet 19 and cyan include C.I. I. Pigment Blue 15 and Black include C.I. I. Pigment Black 7, particularly acidic or neutral pigments, and orange include C.I. I. Pigment Orange 43, 64, 71 and green include C.I.
I. Pigment Green 7 and 36 are more preferable.

In the present invention, the amount of the pigment used is preferably 0.5 to 30% by weight, more preferably 1 to 10% by weight in the ink for ink jet recording.
If the amount of the pigment used is too small, the color density of the ink is lowered, while if it is too large, printing becomes difficult from the viewpoint of ink viscosity and fluidity.

As the aqueous resin used in the aqueous ink-jet ink composition of the present invention, it is desirable to use a pigment-dispersing resin in order to disperse the pigment. The pigment-dispersing resin may be a water-soluble resin or water. Soluble resin, anionic aqueous resin, nonionic aqueous resin and the like can be used.

As the water-soluble resin and the water-soluble resin, cellulose derivatives such as methylcellulose, carboxycellulose and hydroxymethylcellulose, which are generally used in the technical field relating to the present invention, natural high-performance compounds such as lignin sulfonate and shellac. A molecule etc. can be illustrated.

Examples of the nonionic aqueous resin include polyvinyl alcohol, polyvinylpyrrolidone, polyethylene glycol, and other nonionic aqueous resins that are commonly used in the technology of the present invention.

The anionic resin has an acid value of 30 to 300 which is generally used in the technical field of the present invention.
Those of mg KOH / g can be used. Specifically, (meth) acrylic acid alkyl ester- (meth)
Acrylic acid copolymer, styrene- (meth) acrylic acid copolymer, styrene-maleic acid copolymer, styrene-maleic acid- (meth) acrylic acid alkyl ester copolymer, styrene-maleic acid half ester copolymer And so on.

The amount of the above water-based resin is preferably 0.1 to 20% by weight in the pigment-based water-based inkjet ink composition.

The basic compound used in the aqueous ink-jet ink composition of the present invention is not particularly limited as long as it can dissolve or disperse the above-mentioned aqueous resin in an aqueous medium, and generally an aqueous resin is used. The basic compounds used to dissolve or disperse in the aqueous medium can be used. For example, alkylamines such as butylamine and triethylamine, alkanolamines such as monoethanolamine, diethanolamine and triethanolamine,
Examples thereof include compounds such as morpholine and aqueous ammonia, and hydroxides of alkali metals such as sodium hydroxide and potassium hydroxide. These may be used alone or in combination of two or more.

In the aqueous ink-jet ink composition of the present invention, 2-butyl-2-ethyl- is used as an additive.
An alkylene oxide adduct of 1,3-propanediol is used, and its content is preferably 0.1 to 5% by weight in the aqueous inkjet ink composition. In addition, 2-butyl-2-ethyl-1, which is used in the aqueous inkjet ink composition of the present invention,
The alkylene oxide moiety in the alkylene oxide adduct of 3-propanediol may be ethylene oxide, propylene oxide alone, or a mixture thereof.

The pigment-based aqueous inkjet ink composition of the present invention may contain a water-soluble solvent in the aqueous medium in order to impart good inkjet recording suitability such as storage stability and ejection stability. Specifically, lower alcohols such as methanol, ethanol, propanol and butanol, polyhydric alcohols such as ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, glycerin and polyglycerin, ethylene glycol monomethyl ether, ethylene glycol monoethyl. Ethers, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol acetate, diethylene glycol monomethyl ether, polyhydric alcohol derivatives such as dipropylene glycol monomethyl ether, ethylene oxide adducts of polyglycerin, ketones such as acetone and methyl ethyl ketone, diethyl ether , Isopropyl ether, tetrahydrofuran,
Ethers such as 1,4-dioxane, methyl acetate, ethyl acetate, butyl acetate, lactate ester, butyrate ester,
Esters such as ε-caprolactone and ε-caprolactam, and nitrogen-containing compounds such as urea, pyrrolidone, N-methyl-2-pyrrolidone and octylpyrrolidone can be used. The above water-soluble solvents may be used alone or in combination of two or more. The mixing ratio of water and a water-miscible solvent may be appropriately set according to the characteristics of the intended aqueous inkjet ink.

The pigment-based aqueous ink-jet ink composition of the present invention may further contain a surfactant, if necessary.
You may add various additives, such as a pigment dispersant, a viscosity modifier, a defoaming agent, and a preservative.

The pigment-based aqueous ink-jet ink composition of the present invention can be produced by a method generally used in the art. Examples thereof include pigments, aqueous resins, basic compounds, aqueous media and, if necessary, surface-active agents. Agents, pigment dispersants, viscosity modifiers, defoamers, etc. are mixed, and various dispersing / stirring machines such as bead mills, ball mills, sand mills,
Examples thereof include a method in which an attritor, a roll mill, an agitator, a Henschel mixer, a colloid mill, an ultrasonic homogenizer, an ultrahigh pressure homogenizer, and a pearl mill are used for dispersion, and the remaining materials are added and mixed.

In the present invention, as a method for obtaining a pigment dispersion having a desired particle size distribution as an aqueous ink-jet ink composition, the size of the grinding media of the disperser is decreased, the packing ratio of the grinding media is increased, and the treatment is carried out. Means such as lengthening the time, slowing the discharge speed, and classifying with a filter or a centrifuge after pulverization can be used alone or in combination. Hereinafter, the present invention will be described in more detail with reference to Test Examples and Examples, but the present invention is not limited thereto.

[0026]

EXAMPLES The following examples further illustrate the water-based inkjet ink composition of the present invention. However, these examples are provided for illustrative purposes only and do not limit the scope of the invention. In addition,
In the following description, "part" represents part by weight.

<Method for producing aqueous resin> Stirrer, cooling pipe,
Butyl acetate 1 in a four-necked flask equipped with a nitrogen gas inlet tube
80 parts were charged and heated to 100 ° C., while introducing nitrogen gas, 15.3 parts methacrylic acid, 20.0 parts stearyl methacrylate, 15.0 parts styrene, 49.7 parts benzyl methacrylate, as an initiator Kayaester O-50
1.5 parts of a mixture of 7.2 parts TL and 46 parts butyl acetate.
After dropping over a period of time and further copolymerizing for 2 hours while maintaining the same temperature, the solvent was distilled off under reduced pressure to obtain a solid copolymer copolymer having a weight average molecular weight of 10,000, an acid value of 100 mgKOH / g and a glass transition temperature of 67 ° C. A combined resin was obtained. 30 parts of this solid copolymer resin was added to 7.5 parts of triethylenediamine and 6 parts of water.
2.5 parts of the mixed solution was added and stirred to obtain a copolymer resin solution (solid content 30%).

<Preparation of Pigment-Condensed Base Ink> To 13.5 parts of the copolymer resin solution, 71.5 parts of water was added and mixed to prepare a resin varnish for pigment dispersion, and further, a pigment (Printex 80, Degussa Co.) was prepared. (Manufactured by Mfg. Co., Ltd.) and mixed with stirring, and then kneaded with a wet circulation mill to obtain a base ink.

<Preparation of Inkjet Recording Liquid> With the composition shown in Table 1, the base ink obtained by the above method, glycerin, n-propanol, 2-butyl-2-ethyl-1,
Alkylene oxide adduct of 3-propanediol,
And water by stirring and mixing, and Examples 1-3 and Comparative Example 1,
2 inkjet recording liquid was obtained.

[0030]

[Table 1]

<Performance evaluation of printed matter> Printing Method of Inkjet Recording Liquid Using the inkjet recording liquid prepared above, a commercially available inkjet printer (MJ-830C, Piezotype, manufactured by Seiko Epson Corp.) is used to form a recording paper X.
Printed on erox L.

2. Evaluation method of printed matter The printed matter was evaluated by the following evaluation methods, and the results are shown in Table 2.
Shown in.

[0033]

[Table 2]

Print Density The density of the solid part of the printed matter is measured by Macbeth reflection densitometer RT-91.
It measured by 8, and evaluated based on the following criteria. [Evaluation Criteria] A: Density value exceeding 1.20 B: Density value exceeding 1.15 and 1.20 or less C: Density value exceeding 1.10 and 1.15 or less D: Density Value less than 1.10

Dryability The inkjet recording station was touched immediately after printing and the dryness was evaluated based on the following criteria from the time until the recording liquid did not adhere to the finger. [Evaluation Criteria] A: Drying within 2 seconds B: Drying over 5 seconds within 2 seconds C: Drying over 5 seconds

A feathering line pattern was printed, collated with a predetermined sample, and visually evaluated. [Evaluation Criteria] A: Feathering is rare B: Feathering is present C: Feathering is common

[0037]

INDUSTRIAL APPLICABILITY As shown concretely by the above examples and comparative examples, the ink jet recording liquid of the present invention is excellent in water resistance and weather resistance, and is bleeding in line with a dye system or more. It is possible to obtain a printed matter having good printing quality such as absence and sharpness, and dryness.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yuka Hashimoto             Sakata, 1-23-37, Edobori, Nishi-ku, Osaka             Inkus Co., Ltd. F-term (reference) 2C056 EA04 EA13 FC02                 2H086 BA01 BA53 BA59 BA62                 4J039 AB02 AB07 AB09 AD03 AD06                       AD10 AD14 AD23 AE07 BC13                       BE01 BE12 BE22 CA06 EA10                       EA34 EA38 EA47

Claims (3)

[Claims] 1. A water-based inkjet ink composition mainly composed of a pigment, a water-based resin, and a water-based medium,
Furthermore, an alkylene oxide adduct of 2-butyl-2-ethyl-1,3-propanediol is added, which is an aqueous ink-jet ink composition. 2. The above-mentioned 2-butyl-2-ethyl-
The aqueous inkjet ink composition according to claim 1, wherein the alkylene oxide adduct of 1,3-propanediol is used in an amount of 0.1 to 5% by weight in the ink composition. 3. 2-Butyl-2-ethyl-as defined above
The aqueous inkjet ink composition according to claim 1 or 2, wherein the number of added moles of the alkylene oxide adduct of 1,3-propanediol is 2 to 50.