JPH05163448A - Marking ink for jet printer - Google Patents

Abstract

PURPOSE:To provide the subject ink containing a specific quaternary ammonium salt, a coloring agent, a resin and an organic solvent, and excellent in adhesivity and jetting stability. CONSTITUTION:The objective ink contains a coloring agent such as a dyestuff, a resin such as an acrylic resin, an organic solvent such as methyl ethyl ketone, and an organic anion such as naphthol sulfonic acid as a conductivity-imparting agent preferably in an amount of 1.0-10.0wt.%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a marking ink for a jet printer, which has excellent adhesion to various recording materials such as glass, metal and plastic.

[0002]

2. Description of the Related Art Printing by a jet printer is a method in which ink is ejected from a nozzle to adhere to a recording material. Since the nozzle and the recording material are not in contact with each other, a curved surface or an irregular shape with irregularities is formed. Good printing can be performed on the surface having the same.

Various types of jet printers have been put into practical use as such jet printers, but in the marking field that requires high-speed printing, continuous type (charge control type) printers are mainly used. ing. In this method, the ejected ink particles are charged according to an electrical character signal, and are deflected according to the amount of charge by a deflection electrode to form characters or the like, and it is necessary to impart conductivity to the ink. Therefore, various conductivity-imparting agents have been proposed. JP-A-55-50073 and JP-A-56-16
1480, JP-A-58-176271, JP-A-1-245071, and JP-B-2-45663 disclose, as a conductivity-imparting agent, an inorganic substance such as sodium thiocyanate, ammonium thiocyanate, or lithium nitrate. Inks using salt are disclosed in JP-A-56-36559, JP-A-59-202274, and JP-A-60-1.
In JP 10770, an ink using a hydrochloride of an organic amine as a conductivity-imparting agent is disclosed in JP-A-62-1098.
Japanese Patent Publication No. 70 proposes an ink using a quaternary ammonium salt of nitric acid or a quaternary ammonium salt of thiocyanic acid as a conductivity-imparting agent.

[0004]

However, all of the inks described in the above-mentioned publications have an appropriate electric conductivity, but the compatibility between the resin used as the binder and the conductivity-imparting agent is high. It is defective, and therefore has a problem that the adhesion to various recording materials is insufficient.

The present invention provides a marking ink for a jet printer which is excellent in adhesion to various recording materials such as glass, metal and plastic by using a conductivity-imparting agent having good compatibility with various resins. To do.

[0006]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have incorporated a quaternary ammonium salt whose anion is an organic anion as a conductivity-imparting agent. By this, it is possible to impart appropriate electric conductivity to the ink, and since the compatibility between the above-mentioned conductivity-imparting agent and various resins used as a binder is good, a jet having excellent adhesion to various recording materials can be obtained. The inventors have found that a marking ink for a printer can be obtained, and have reached the present invention.

The present invention relates to a jet printer ink containing a colorant, a resin and an organic solvent, characterized by containing a quaternary ammonium salt whose anion is an organic anion as a conductivity-imparting agent. The present invention relates to a marking ink for a printer.

Next, the present invention will be described in detail. Examples of the organic anion of the quaternary ammonium salt used as a conductivity-imparting agent in the present invention include organic sulfonate anions, monoalkyl sulfate anions, and carboxylate anions, but are not limited thereto. However, a quaternary ammonium salt of organic sulfonic acid is particularly preferable. These quaternary ammonium salts of organic sulfonic acids include quaternary ammonium hydrochloride and toluene sulfonic acid, naphthalene sulfonic acid, naphthol sulfonic acid, dioxy, which are generally used as conditioning agents, antistatic agents, softening agents, etc. It is obtained by salifying an organic sulfonic acid such as naphthalene sulfonic acid and aminonaphthalene sulfonic acid by a known method, and a quaternary ammonium salt of naphthol sulfonic acid is particularly preferable.

Specific examples are given below, but these compounds may be used alone or in admixture of two or more kinds. In addition, the content of these conductivity-imparting agents is preferably in the range of 1.0 to 10.0% by weight from the viewpoint of providing the ink with appropriate electric conductivity.

[0010]

[Chemical 1]

[0011]

[Chemical 2]

[0012]

[Chemical 3]

The solvent that can be used in the present invention is not particularly limited as long as it can dissolve the dye as the colorant used in the present invention, the binder resin, and the conductivity-imparting agent. -Alcohols such as alcohol, ethanol and propanol, ketones such as dimethyl ketone and methyl ethyl ketone, glycols and glyco-
Examples thereof include nitrogen-containing compounds such as ethers, glycol esters, aromatic hydrocarbons, aliphatic hydrocarbons, amides, amino alcohols, morpholine and pyridine, and two or more kinds in combination. It can also be used. In particular, a solvent containing methyl ethyl ketone or methanol or ethanol is preferable as the solvent for improving the solubility of the conductivity-imparting agent, the electric conductivity of the ink, and the ink drying property.

As the binder resin used in the present invention, any resin can be used as long as it is soluble in the organic solvent and has a good compatibility with the conductivity-imparting agent. Specifically, acrylic resin, styrene acrylic resin, silicone resin,
Examples include, but are not limited to, phenol resin, terpene phenol resin, epoxy resin, modified epoxy resin, polyester resin, cellulose resin, vinyl chloride resin, petroleum resin and rosin ester. Instead of one, two or more kinds may be mixed and used at the same time.

The colorant which can be used in the present invention is an oil-soluble dye such as a monoazo type, a disazo type, a metal complex salt type, an anthraquinone type, a phthalocyanine type or a triallylmethane type which has been conventionally used in various coloring fields. Examples include inorganic pigments such as carbon black, titanium oxide, zinc oxide, zinc sulfide, and organic pigments such as monoazo pigments, disazo pigments, phthalocyanine pigments, and quinacridone pigments, but are not limited thereto.

In order to improve the adhesion and the abrasion resistance at low temperature of the ink film printed with the marking ink for jet printers of the present invention, phthalate ester is added to the ink.
A plasticizer such as sebacic acid ester, stearic acid ester, phosphoric acid ester, citric acid ester, adipic acid ester, maleic acid ester, trimellitic acid ester, etc., which has a good compatibility with the resin used in the present invention It is particularly preferable to add 0.5 to 5% by weight of at least one compound selected from phthalic acid ester and sebacic acid ester, which is highly compatible with the resin used in the present invention. Specific examples of the phthalate ester include diethyl phthalate, dibutyl phthalate, dioctyl phthalate, and the like, and examples of the sebacate ester include diethyl sebacate, dibutyl sebacate, dioctyl sebacate, and the like. It is not limited to these.

[0017]

The present invention will be described in detail below with reference to examples. In addition, "part" in the following description represents a weight part.

Example 1 C. I. Solvent Bull-70 7.0 parts DIALAL BR-113 4.5 parts (Mitsubishi Rayon acrylic resin) XJ-6007 6.0 parts (Nippon Ciba-Geigy modified epoxy resin) KR-216 3.5 parts (Silicon resin manufactured by Shin-Etsu Silicone) Dibutyl sebacate 1.5 parts Compound of the general formula (4) 3.0 parts Methyl ethyl ketone 60.5 parts Methanol 14.0 parts Sufficiently stirring the above composition After dissolution, this solution was filtered using a 0.5 μm membrane filter to obtain a marking ink for a jet printer.

Example 2 C. I. Solvent Red 35 3.0 parts John Cryl 611 16.0 parts (Johnson Polymer's styrene acrylic resin) YS Polystar T-130 7.0 parts (Yasuhara Chemical's terpene phenol resin) Dibutyl sebacate 2.0 parts Compound of general formula (6) 3.0 parts Methyl ethyl ketone 55.0 parts Methanol 14.0 parts After thoroughly agitating and dissolving the above composition, the solution is filtered using a 0.5 μm membrane filter. By doing so, a marking ink for a jet printer was obtained.

Example 3 C. I. Solvent Yellow-79 5.0 parts NCL1 / 8 16.0 parts (Asahi Kasei nitrocellulose resin) Dibutyl phthalate 2.0 parts Compound of the general formula (9) 3.0 parts Methyl ethyl ketone 56.0 parts Methanol 18 0.0 parts The above formulation was sufficiently stirred and dissolved, and this solution was filtered using a 0.5 μm membrane filter to obtain a marking ink for a jet printer.

Example 4 C. I. Solvent Bull-70 3.0 parts C.I. I. Solvent Yellow-79 4.0 parts Diinal BR-113 6.0 parts XJ-6007 6.0 parts Dibutyl phthalate 2.0 parts Compound of the specific example (4) 3.5 parts Methyl ethyl ketone 55.5 parts Methano- 15.0 parts Ethanol 5.0 parts After thoroughly agitating and dissolving the above composition, the solution is filtered using a 0.5 μm membrane filter to prepare a marking ink for a jet printer. Got

Example 5 REGAL 330R 4.0 parts (CABOT carbon black) NCL1 / 8 4.0 parts Solpers 2400 0.5 parts (ICI pigment dispersant) dibutyl sebacate 1.0 part Chips obtained by kneading and dispersing the above-mentioned composition with two rolls 9.
In 5 parts, 3.0 parts of VMCA (carboxyl modified vinyl chloride vinyl acetate copolymer resin manufactured by Union Carbite) and 2.0 parts of the compound of the general formula (4) were added to methyl ethyl ketone 77.
A solution dissolved in a mixed solvent of 0 part and 8.5 parts of methanol was added, and after sufficiently stirring, the mixed solution was filtered using a 5 μ filter to obtain a jet printer.
A marking ink for use was obtained.

Example 6 R-830 8.0 parts (Rutile type titanium oxide manufactured by Ishihara Sangyo Co., Ltd.) Johncryl 611 8.0 parts Sols Paase 2400 1.6 parts Methyl ethyl ketone 34.0 parts Paint conditioner prepared from the above composition. To the base ink dispersed for 2 hours with John Cryl 611 10.0
Part, Ester gum HT (Arakawa chemical rosin ester)
A solution prepared by dissolving 6.0 parts of the compound of the general formula (4) 4.0 parts in a mixed solvent of 9.4 parts of methyl ethyl ketone and 19.0 parts of methanol was added, and the mixture was thoroughly stirred and mixed. The solution was filtered using a 5μ filter to obtain a marking ink for a jet printer.

Continuous ink jet printer manufactured by Hitachi, Ltd. using the inks of Examples 1 to 6
Printing was performed on a glass plate, a plastic plate (acrylic resin, nylon resin, vinyl chloride resin, polycarbonate resin) and a metal plate (aluminum, stainless steel, tin plate) using an "IJ printer". As a result, glass acrylic resin, nylon resin, vinyl chloride resin, polycarbonate
A clear printed image was obtained with respect to the bone resin, aluminum, stainless steel, and tin plate, and the jetting stability was also good.

Then, "cellote tape" (cellophane adhesive tape manufactured by Nichiban Co., Ltd.) is attached to each printed image printed on the above-mentioned printed matter, and printing is then performed by peeling off "cellote tape". The adhesion of the image, and then the adhesion of the printed image by rubbing the printed image 10 times with an eraser (MONO manufactured by Tombow Pencil Co., Ltd.) were evaluated to be sufficiently readable and to show good adhesion. Was.

Further, when the water resistance of the printed image was evaluated by immersing the printed material on the glass plate in water for 1 hour, it was found that the printed image did not peel and was sufficiently readable. Comparative Example 1 C.I. I. Solvent Bull-70 7.0 parts Dinal BR113 4.5 parts XJ-6007 6.0 parts KR-216 3.5 parts Dibutyl sebacate 1.5 parts Sodium thiocyanate 0.5 parts Methyl ethyl ketone 60.5 parts Methano 16.5 parts After thoroughly stirring and dissolving the above-mentioned formulation in which sodium thiocyanate was used in place of the compound of the general formula (4) in the ink composition of Example 1, this solution was added to 0. A marking ink for a jet printer was obtained by filtering with a 5 µ membrane filter.

Comparative Example 2 R-830 8.0 parts (Rutile type titanium oxide manufactured by Ishihara Sangyo Co., Ltd.) Johncryl 611 8.0 parts Sols Paase 2400 1.6 parts Methyl ethyl ketone 34.0 parts The above composition was applied to a paint conditioner. To the base ink dispersed for 2 hours with John Cryl 611 10.0
Part, Ester gum HT (Arakawa chemical rosin ester)
A solution prepared by dissolving 6.0 parts and 0.5 part of lithium nitrate in a mixed solvent of 12.9 parts of methyl ethyl ketone and 19.0 parts of methanol was added, and after thoroughly stirring, the mixed solution was mixed with 5 parts.
Example 6 by filtering with a μ filter
A marking ink for a jet printer using lithium nitrate in place of the compound of the general formula (4) in the above ink was obtained.

Using the inks of Comparative Examples 1 and 2, glass plates and plastic plates (acrylic resin, nylon resin, vinyl chloride resin, polycarbonate) were used in the same manner as in Example 1.
Resin) and a metal plate (aluminum, stainless steel, tin plate). As a result, a clear printed image was obtained on the glass acrylic resin, nylon resin, vinyl chloride resin, polycarbonate resin, aluminum, stainless steel, and tin plate, and the jetting stability was also good.

Next, "cellote tape" (cellophane adhesive tape manufactured by Nichiban Co., Ltd.) is attached to each printed image printed on the above-mentioned printing material, and printing is then performed by peeling off "cellote tape". The adhesion of the image, and then the adhesion of the printed image by rubbing 10 times with an eraser (MONO manufactured by Tombow Pencil Co., Ltd.) were evaluated, and peeling was observed in a part of the printed image.

Further, the water resistance of the printed image was evaluated by immersing the printed material on the glass plate in water for 1 hour. As a result, the printed image peeled and became unreadable.

[0031]

According to the present invention, in a jet printer ink containing a colorant, a resin and an organic solvent, a quaternary ammonium salt whose anion is an organic anion is contained as a conductivity-imparting agent. This makes it possible to obtain an ink having excellent adhesion to various recording materials such as glass, metal, and plastic, and good jetting stability.

Claims (3)

[Claims] 1. A marking ink for a jet printer containing a colorant, a resin and an organic solvent, wherein the electroconductivity-imparting agent contains a quaternary ammonium salt whose anion is an organic anion. Marking ink for use. 2. A marking ink for a jet printer according to claim 1, which contains a quaternary ammonium salt of an organic sulfonic acid as a conductivity-imparting agent. 3. The marking ink for a jet printer according to claim 2, which contains a quaternary ammonium salt of naphtholsulfonic acid as a conductivity-imparting agent.