KR20020076783A - Ink composition for printer - Google Patents

Abstract

The present invention relates to an ink composition for a printer, and more particularly, to an ink composition comprising trimethyl glycine. The present invention also provides an ink composition for a printer comprising 0.1 to 15% by weight of trimethyl glycine, 1 to 40% by weight of a water-soluble organic solvent, 40 to 95% by weight of water and 0.1 to 15% by weight of an additive. The composition is excellent in ejection stability while satisfying various conditions of the printer ink, not only can maintain a sufficient concentration for smooth writing at the fine nozzle tip, but also has no bleeding in printed matter. Particularly, conventionally, glycol-based compounds have been used to improve the dryness, which ultimately increases the viscosity of the ink, and in the long term, provides an unstable factor in ink ejection. However, the trimethyl glycine used in the present invention has a viscosity It is an excellent product that completely solves the problems according to the prior art by being excellent in dryness and long-term stability without affecting the change at all.

Description

Ink composition for printers {INK COMPOSITION FOR PRINTER}

The present invention relates to an ink composition for a printer, and more particularly, to an ink composition for an inkjet printer containing trimethylglycine.

Inks for inkjet printers are usually based on a water-soluble medium such as water, and have the requirement of having stability of long-term storage as well as light resistance and water resistance to some extent, and being harmless and odorless. In addition, any paper must be printed with high density and clear, and the conditions such as no clogging of nozzles must be satisfied. Among them, it is important to prevent clogging of nozzles.

Conventional inkjet printer inks use a large amount of organic solvents to enhance properties such as light resistance and water resistance. In this case, when the ink is exposed to air, clogging of the printer nozzle occurs due to solidification by drying, and ink is ejected. It does not happen. That is, conventionally, mainly by using a glycol-based compound to improve the dryness, which ultimately increases the viscosity of the ink, there is a problem that in the long run to provide an unstable element for ink ejection.

On the other hand, various dispersants are used for fine dispersion and stabilization in water-soluble organic solvents. As a result, problems such as poor printing or poor discharge stability occur due to the nozzle tip becoming viscous during continuous discharge for a long time. Done.

Therefore, researches on the development of printing ink compositions for printing, which are excellent in ejection stability and can maintain sufficient concentrations for smooth writing at a fine nozzle tip while satisfying all the conditions of the inkjet printer ink described above, are being actively conducted. .

The present invention aims to solve the problems of the prior art as described above and to provide an ink composition for a printer which can prevent clogging of the nozzle as well as excellent discharge stability as a general condition of ink for an ink jet printer. have.

As a result of intensive studies to achieve the above technical problem, the present inventors have found that an ink composition prepared by containing trimethyl glycine can effectively solve the above problems, thereby completing the present invention.

Accordingly, the present invention provides an ink composition for a printer, comprising trimethyl glycine.

The structure of the trimethyl glycine contained in the ink composition according to the present invention is as follows.

Trimethyl glycine used in the present invention is a natural amino acid-based wetting agent extracted from plants, but can also be used by artificially synthesizing.

The present invention provides an ink composition for a printer comprising 0.1 to 15% by weight of trimethyl glycine, 1 to 40% by weight of a water-soluble organic solvent, 40 to 95% by weight of water and 0.1 to 15% by weight of an additive.

The components of the jet ink for improved ink jet printers have a high ability to absorb moisture in the air, and the amount of trimethyl glycine varies depending on the properties of the ink required, or depending on the amount of organic solvent used and the composition ratio of various additives. It is preferred to use 15% by weight, more preferably 0.5 to 5% by weight. Trimethyl glycine has a characteristic that it is easy to trap moisture in the air due to the chemical structure to compensate for the evaporation of moisture that may occur at the nozzle end or to suppress the increase in viscosity of the solution due to the evaporation of the organic solvent. However, when the added amount is more than 15% by weight, the dissolution stability of the dye tends to be inhibited. If the added amount is less than 0.1% by weight, the amount of trapping moisture in the air is small, which is undesirable.

The water-soluble organic solvent included in the ink composition may be a lower alcohol having 1 to 4 carbon atoms such as methanol, ethanol, isopropanol and normal butanol; Ketones and ketone alcohols such as acetone and acetone alcohol; Alkylene glycols and polyalkylene glycols such as ethylene glycol, propylene glycol, diethyl glycol, triethylene glycol, polyethylene glycol, and polypropylene glycol; Lower alkyl ethers of polyhydric alcohols such as ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, triethyl glycol monobutyl ether and dipropylene glycol monobutyl ether; Polyhydric alcohols such as glycerin, 1,3-butanediol and 1,4-butanediol; Pyrrolidones such as 2-methylpyrrolidone and N-methyl-2-pyrrolidone; And one or two or more selected from formamide, dimethylformamide, and dimethyl sulfoxide. The amount of the organic solvent is not particularly limited, but is generally used in the range of 1 to 50% by weight.

The water used in the preparation of the ink composition according to the present invention is preferably using deionized water, and generally 40 to 90% by weight of the ink composition is included, the amount of water is the rate at which the ink is absorbed into the paper Adjust the amount of water and organic solvent according to the characteristics such as the degree of spreading.

In addition, the composition according to the present invention includes one or more additives of a dispersant, a preservative, a rust preventive agent, a pH adjuster, a surfactant. Here, as the dispersant, an ethylene oxide adduct of fluorinated aliphatic alcohol, polyethylene glycol, and the like are used. As the preservative, alkyl ester of benzoic acid and the like, and monoethanol amine, diethanol amine and diethyl amine, triethyl as a pH regulator. It is preferable to use lower amines, such as an amine, as a rust inhibitor and a benzotriazole derivative. As the surfactant, anionic surfactants such as alkyl arylsulfonates such as sulfate esters of higher alcohols such as sulfate esters of oleyl alcohol, cationic surfactants such as alkyl amine salts, alkyl ethers of polyoxyethylene and polyoxyethylene Nonionic surfactants, such as aryl ether, etc. can be used. The additives are used to control various physical properties of the ink, and generally use 0.01 to 5% by weight.

The ink composition for a printer according to the present invention is prepared by first putting a dye, trimethyl glycine, an organic solvent, an additive, and water according to the use into a reactor, stirring well to make a uniform mixture, and then filtering. In this way, it is possible to obtain the printing jet ink for printing, which satisfies the general conditions of the printer ink, which is excellent in ejection stability and can maintain sufficient concentration for gentle writing at the fine nozzle tip.

Although the configuration of the present invention will be described in more detail with reference to the following examples, the scope of the present invention is not limited by the following examples.

Unless otherwise specified in the present specification, 'parts' refers to 'parts by weight' and '%' refers to '% by weight'.

Example 1

5 parts of ethylene glycol, 8 parts of polyethylene glycol (PEG) 400, 5 parts of triethylene glycol monobutyl ether, and 2 parts of additives including preservative, rust preventive agent, pH adjuster, dispersant, etc., 3 parts of trimethyl glycine and 73 parts of water Put in and mix well. Then, 4 parts of Direct Black19 were added and stirred at 50 ° C. for 2 hours to obtain a homogeneous solution. After cooling to room temperature, the product was filtered.

Example 2

Into the reactor, 7 parts of ethylene glycol, 8 parts of PEG400, 5 parts of triethylene glycol monobutyl ether, and 2 parts of additives including preservative, rust preventive agent, pH adjuster, dispersant, etc., 2 parts of trimethyl glycine and 73 parts of water were mixed well. . Then, 3 parts of Acid Red87 was added and stirred at 50 ° C. for 2 hours to obtain a homogeneous solution. After cooling to room temperature, the product was filtered.

Example 3

Into the reactor, 3 parts of ethylene glycol, 6 parts of PEG400, 5 parts of triethylene glycol monobutyl ether, and 2 parts of an additive including a preservative, rust preventive agent, pH adjuster, and dispersant were added, followed by 2 parts of trimethyl glycine and 78 parts of water, followed by mixing. . 4 parts of Acid Yellow23 was added thereto, followed by stirring at 50 ° C. for 2 hours to obtain a homogeneous solution. After cooling to room temperature, the product was filtered.

Example 4

Into the reactor, 3 parts of ethylene glycol, 6 parts of PEG400, 5 parts of triethylene glycol monobutyl ether, and 2 parts of an additive including a preservative, rust preventive agent, pH adjuster, dispersant, etc., 3 parts of trimethyl glycine and 77 parts of water were mixed and mixed well. . And, 4 parts of Acid Blue9 was added and stirred at 50 ° C. for 2 hours to obtain a homogeneous solution. After cooling to room temperature, the product was filtered.

Comparative Example 1

5 parts of ethylene glycol, 8 parts of PEG400, 5 parts of triethylene glycol monobutyl ether, and 2 parts of an additive including a preservative, a rust preventive agent, a pH adjuster, a dispersant, and 76 parts of water were added and mixed well. Then, 4 parts of Direct Black19 were added and stirred at 50 ° C. for 2 hours to obtain a homogeneous solution. After cooling to room temperature, the product was filtered.

Comparative Example 2

7 parts of ethylene glycol, 8 parts of PEG400, 5 parts of triethylene glycol monobutyl ether, and 2 parts of an additive including a preservative, a rust preventive agent, a pH adjuster, a dispersant, and 78 parts of water were added and mixed well. Then, 3 parts of Acid Red87 was added and stirred at 50 ° C. for 2 hours to obtain a homogeneous solution. After cooling to room temperature, the product was filtered.

Comparative Example 3

3 parts of ethylene glycol, 6 parts of PEG400, 5 parts of triethylene glycol monobutyl ether, and 2 parts of an additive including a preservative, a rust preventive agent, a pH adjuster, a dispersant, and the like were mixed with 81 parts of water. 4 parts of Acid Yellow23 was added thereto, followed by stirring at 50 ° C. for 2 hours to obtain a homogeneous solution. After cooling to room temperature, the product was filtered.

Comparative Example 4

3 parts of ethylene glycol, 6 parts of PEG400, 5 parts of triethylene glycol monobutyl ether, and 2 parts of an additive including a preservative, a rust preventive agent, a pH adjuster, and a dispersant were added, followed by 80 parts of water, followed by mixing well. And, 4 parts of Acid Blue9 was added and stirred at 50 ° C. for 2 hours to obtain a homogeneous solution. After cooling to room temperature, the product was filtered.

As a result of using the inks prepared according to Examples 1 to 4 and Comparative Examples 1 to 4 as spraying inks for inkjet printers, the inks prepared according to Examples 1 to 4 had no bleeding in printed matter, Excellent, the discharge stability and printing at the nozzle was smoothly output. The evaluation results of the physical properties of the ink and the dryness, bleeding and long term stability of the ink are shown in Table 1 below.

Drying of printing is performed by printing various characters at 360DPI (dot per inch) on an inkjet paper at room temperature, and then printing them on a chemical filter paper at 10 second intervals (after 10, 20, 30, 40, 50 and 60 seconds, respectively). When pressed, the time which does not contaminate the filter paper was measured and the result was shown (within 20 second: "◎", within 20 to 50 second: "⊙", 51 second or more: "Δ").

The bleeding property was continuously printed on normal copying paper at room temperature, then left for 1 hour, and the result of bleeding was determined by comparing with the microscope immediately after printing (within 10%: "◎", 10 to 30%). : "⊙", 31% or more: "△").

Long-term stability was evaluated by printing 100 ml of each ink in a glass bottle and leaving it at 40 ° C. for 2 months and printing it on ordinary copying paper (good: “◎”, occasional clogging: “⊙”). Frequent blockage: "△").

NO. Physical property (25 ℃) Dryness Smearing Long-term stability Viscosity (cp) Surface tension (dyne / ㎠) Example 1 3.1 43 ◎ ◎ ◎ Example 2 3.0 45 ◎ ◎ ◎ Example 3 3.0 42 ◎ ◎ ◎ Example 4 3.1 43 ◎ ◎ ◎ Comparative Example 1 3.7 44 ⊙ ⊙ △ Comparative Example 2 3.4 47 ⊙ ⊙ △ Comparative Example 3 3.5 43 ⊙ ⊙ △ Comparative Example 4 3.4 44 ⊙ ⊙ △

As described above, the composition for a printer ink according to the present invention is excellent in ejection stability while satisfying water and light resistance, which are all conditions of a printer ink, and is capable of maintaining a sufficient concentration for soft writing at a fine nozzle tip. Not only can be obtained, but also there is no bleeding in the printed matter, excellent in dryness and long-term stability is an excellent product that completely solved the problems according to the prior art.

Claims (9)

Ink composition for a printer comprising trimethyl glycine The method of claim 1, An ink composition for a printer comprising 0.1 to 15 wt% trimethyl glycine, 1 to 40 wt% water soluble organic solvent, 40 to 95 wt% water, and 0.1 to 15 wt% additive. The method of claim 2, The water-soluble organic solvent is a lower alcohol having 1 to 4 carbon atoms as methanol, ethanol, isopropanol, normal butanol; Acetone and acetone alcohol as ketones and ketone alcohols; Alkylene glycols and polyalkylene glycols include ethylene glycol, propylene glycol, diethyl glycol, triethylene glycol, polyethylene glycol, polypropylene glycol; Lower alkyl ethers of polyhydric alcohols include ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, triethyl glycol monobutyl ether, dipropylene glycol monobutyl ether; Glycerin, 1,3-butanediol, 1,4-butanediol as polyhydric alcohols; 2-methylpyrrolidone, N-methyl-2-pyrrolidone as pyrrolidone; And at least one selected from formamide, dimethylformamide, and dimethyl sulfoxide. The method of claim 2, The additive is an ink composition, characterized in that at least one of dispersants, preservatives, rust inhibitors, pH adjusting agents, viscosity adjusting agents, antibacterial agents, and surfactants. The method of claim 4, wherein The dispersant is an ink composition, characterized in that at least one selected from ethylene oxide adducts or polyethylene glycol of fluorinated aliphatic alcohol. The method of claim 4, wherein The preservative is an ink composition, characterized in that the alkyl ester of benzoic acid. The method of claim 4, wherein An ink composition, characterized in that at least one selected from monoethanol amine, diethanol amine and lower amines such as diethyl amine and triethyl amine as the pH adjusting agent. The method of claim 4, wherein The anticorrosive agent ink composition, characterized in that the benzotriazole derivatives. The method of claim 4, wherein The surfactants include anionic surfactants such as alkyl arylsulfonates such as sulfate ester salts of higher alcohols such as sulfate esters of oleyl alcohol and sodium salts of dodecylbenzene sulfonate, and cationic surfactants such as alkyl amine salts and polyoxy. At least one selected from alkyl ether of ethylene and aryl ether of polyoxy ethylene.