TWI274069B - Water-soluble black ink - Google Patents

Abstract

A water-soluble black ink for an inkjet printer is disclosed. The water-soluble black ink includes (1) a water-soluble pigment, 1 to 10%; (2) a surfactant, 0.01 to 5%; (3) a preservative, 0.1 to 1%; (4) an organic cosolvent, 10 to 40%; and (5) a deionized water (DI water), wherein the organic cosolvent further includes a ketone and an alcohol mixed in a specific ratio for improving the stability of the water-soluble black ink.

Description

1274069 V. INSTRUCTION DESCRIPTION OF THE INVENTION (1) Field of the Invention The present invention relates to a black pigment ink, and more particularly to a water-soluble black ink suitable for use in a high-end ink jet printer. Prior Art In recent years, with the popularity of personal computers and the rapid growth of the Internet, inkjet printers have become almost a must-have product in personal computer equipment. For a typical user, a basic inkjet printer is sufficient to meet the needs of its general documentation. However, in addition to the functions of the printer itself, the choice of ink, consumables, printing paper, and how it is used will determine the quality of the print and the long-term use of the printer. The black colorants used in the traditional inkjet printer inks are mostly water-soluble dyes, and the water-soluble dyes have the advantage of being easy to disperse in water, and are also relatively easy to produce and process. Because the water-soluble dye has excellent resolubility, there is no problem that the nozzle can be clogged and the nozzle is blocked and cannot be printed. However, because the water-soluble dye has excellent resolubility, when the ink is printed on the paper, After that, it is easy to encounter water and blur the font. Although this can improve the water fastness on the paper by changing the structure of the dye, it still cannot achieve 100% effect. When the black pigment is selected from water-soluble pigments, the ink has excellent water resistance, and the dispersion technique of the current black pigment is very mature, so the water-soluble pigment in the ink is also quite stable. However, for pigments dispersed in water, it has a characteristic that regardless of the stability of the pigment in water, the pigment in the water will fluctuate with the increase of the standing time.

1274069 V. INSTRUCTIONS (2) Condensation phenomenon, and if the flocculated matter is increased, the pigment particle size will gradually become larger and precipitate. When the ink containing the water-soluble pigment is applied to an ink jet head having a flow path and a nozzle hole diameter of less than 30 μm (3 m), once the blockage occurs, the entire nozzle is blocked or damaged, thereby affecting the print quality. It is necessary to use an appropriate ink composition to improve stability during storage and use. Therefore, how to develop a water-soluble black ink which can avoid the above disadvantages and improve the quality stability is an urgent problem to be solved. SUMMARY OF THE INVENTION The main object of the present invention is to provide a water-soluble black ink applied to an ink jet printer by adding a specific proportion of an organic mixed solvent to improve the stability of the black ink and prevent the nozzle from being crusted. Increase print quality. In order to achieve the above object, the present invention provides a water-soluble black ink which is composed of (1) a water-soluble pigment, 1 to 10%; (2) a surfactant, 0 · 0 1 to 5 %; (3) a preservative, 0 · ; 1 to 1 % ; ( 4 ) organic solvent, 10 0 to 40%; and (5) deionized water. The organic solvent further comprises an alcohol having a heterocyclic ketone and a linear monoalcohol compound having 1 to 5 carbons, and is formulated in a specific ratio, and is blended in a specific ratio of 1:2 in this embodiment. For the best results. In practical applications, the ketone having a heterocyclic ring may be selected from the group consisting of a pyrrolidone, a fluorenylpyrrolidone, a pyrrolidone compound or a mixture thereof; and the alcohol may be selected from the group consisting of 1 to 5 carbons. A linear monool compound, a linear diol compound or a mixture thereof. Of course, the surfactant is a nonionic or a bisionic surfactant.

1274069 V. INSTRUCTIONS (3) This case can be clearly understood by the following illustrations and examples. Brief Description of the Diagram The first picture: it reveals the weight fraction of the basic constituents of the water-soluble black ink in this case. Embodiments The present invention relates to an organic mixed solvent applied to a water-soluble black ink. In the following embodiments, the black ink of an inkjet printer is used to illustrate the application technique of the organic mixed solvent of the present invention, but the black ink to which the technology of the present invention can be applied is not Limited to water-soluble black inks for ink jet printers, any black ink suitable for the following technical features can be incorporated herein by reference. Please refer to the first figure, which shows the weight fraction of the basic constituents of the water-soluble black ink in this case. As shown in the first figure, the water-soluble black ink is composed of (1) water-soluble pigment, 1 to 10%; (2) surfactant, 0·(Η~ 5%; (3) preservative, 0.1~ 1%; (4) organic solvent, 10~40%; and (5) deionized water, wherein the organic solvent is composed of a heterocyclic ketone and a linear chain of 1~5 carbons. The alcohol of the monool compound is formulated in a specific ratio, and is optimally formulated in a specific ratio of 1:2 in the present embodiment. In practical use, the ketone having a heterocyclic ring may be selected from the group consisting of π pirone, monomethyl ρ ratio, 吼 各 ketone compounds or mixtures thereof; and the alcohols may be selected from linear monoalcohol compounds having 1 to 5 carbons, linear diols a compound or a mixture thereof. Of course, the surfactant is a nonionic

1274069 V. INSTRUCTIONS (4) Type or a zwitterionic surfactant. However, in the foregoing composition, the water-soluble pigment is a highly concentrated black pigment which has been dispersed, such as TMB-300, TMB-800, CAB-0-JET 200, CAB-0-JET 300, Hostafine Black 0. - ΡΤ and Aery jet Black- 3 5 7 etc., is a commercial material, which is easily available in the market. The addition of a small amount of surfactant, the function of which is to improve the adhesion between the pigment and the paper and to increase the water resistance when the ink is printed on the paper. As mentioned above, the source may be selected from nonionic or zwitterionic surfactants, such as Surf ο ny 1 4 4 0, Surf ο ny 1 4 6 5, Pannox 19, Pannox 122A, ABLUTER CPS··· Wait. Since the surfactant is a commercially available material, it will not be described in detail herein.

The present invention is mainly prepared by using a heterocyclic ketone and an alcohol having a linear monoalcohol compound of 1 to 5 carbons in a specific ratio of 1:2, and is from 1% to 40%. The weight ratio is added to the water-soluble black ink to improve the stability of the water-soluble black ink and prevent the nozzle from crusting and increase the print quality. To further illustrate the technical content of this case, please refer to the following examples. Example I The water-soluble ink of the present invention was prepared according to the following composition: TMB-300 5 % 2-Pyrrolidinone 10 % 1,5-Pentanediol 20 % Pannox 19 0.02 % Preservative 0.1 % Deionized water Other

1274069 V. Description of the Invention (5) Unlike the conventional water-soluble black ink formulation, the black ink of the present embodiment further contains a ketone (° ratio, each ketone, 2-Pyrrolidinone) and an alcohol (1,5-P). Entanedi 〇丨), according to the weight ratio of 1: 2, added to the black ink 'accounting for 30% of the total weight of the ink. Where the ϋ 嗣 and the 1,5_

The chemical structural formula of Pen t aned i ο 1 is as follows: Oral ketone (2-Pyrrolidinone) 1,5-Pentanediol

The organic mixed solvent blended in a specific ratio can be added to the original water-soluble black ink to improve the stability of the water-soluble black ink and prevent the nozzle from being crusted and the printing quality to be improved.

EXAMPLE II In another embodiment of the present invention, the water-soluble ink of the present invention can be formulated according to the following composition: CAB-0-JET 300 5 % ° ratio 17 ketone (2-Pyrrolidinone) 10 % 1,4-Butanediol 10 % Isopropanediol 10 % Surfynol 465 0.2 %

1274069 V. INSTRUCTIONS (6) Preservative 0.1% Deionized Water Otherly, the black ink of this embodiment contains a _ class (σ ratio σ ketone, 2 - compared with the conventional water-soluble black ink formulation). Pyrrolidinone) and monools (1,4-Butanediol and Isopropanediol) are added to the black ink in a weight ratio of 1:2, accounting for 30% of the total weight of the ink. The chemical structural formula of the pyrrolidone and the linear organic alcohols of 1 to 5 carbons (1,4-Butanediol and Isopropanediol) is as follows: ° ratio ° 2-Pyrrolidinone 1,4-Butanediol

The organic mixed solvent blended with OH in a specific ratio can be added to the original water-soluble black ink to improve the stability of the water-soluble black ink and prevent the coating of the nozzle and increase the printing quality.

Example 11 I

Page 10 1274069 V. INSTRUCTIONS (7) In another embodiment of the present invention, the water-soluble ink of the present invention is prepared according to the following composition:

Hostafine Black O-PT 5 % 2-Pyrrolidinone 5 % methyl ratio σ ketone 5 % 1,5-Pentanediol 20 % Surfynol 465 0.02 % Preservative 0.1 % Deionized water Other similarly, phase Compared with the conventional water-soluble black ink formulation, the black ink of the present embodiment further comprises a ketone-like ketone, 2 - P yrr ο 1 idi η ο ne and methyl ketone, 1-Methylpyrrolidinone) and An alcohol (1,5-Pentanedi ο 1) is added to the black ink in a weight ratio of 1:2, which accounts for 30% of the total weight of the ink. The chemical structures of the ketones (pyrrolidone, 2-pyrrolidinon e and methyl ketone, 1-Methyl pyrrolidinone) and the linear alcohols of 1 to 5 carbons (1,5-Pentanediol) are as follows: Show: 吼- ketone (2-Pyrr〇ndin〇ne) l, 5. Pentanediol

1274069 V. INSTRUCTIONS (8) Methyl sigma ketone 1 - Methylpyrrolidinone 〇cr° The organic mixed solvent formulated in a specific ratio can be added to the original water-soluble black ink to improve the stability of the water-soluble black ink. Prevent the nozzle from crusting and increase the printing quality. In summary, the present invention is applied to an organic mixed solvent of water-soluble black ink, which is mainly prepared by a specific ratio of a ketone and an alcohol to improve the stability of the water-soluble black ink. Since the organic mixed solvent of the present invention is added to the water-soluble black ink in a weight ratio of 10% to 40%, the addition of the organic mixed solvent does not affect the original water resistance of the black ink. In addition, organic mixed solvents have functions such as improved ink stability, anti-spraying and increased print quality. Moreover, the addition of the organic mixed solvent can avoid the pigment dispersed in the ink, and the flocculation phenomenon occurs due to the increase of the storage time, so that the particle size of the pigment gradually becomes larger due to flocculation and precipitates, and even blocks the entire nozzle to affect the printing. quality. Furthermore, the configuration of the organic mixed solvent in this case can be easily prepared by the ratio of pyrrolidone and short-chain alcohol in a ratio of 1:2, which is very simple. Therefore, the case is of great industrial value and is submitted according to law. This case has been modified by people who are familiar with this skill, but it is not to be protected as intended.

Page 12 1274069 Brief description of the diagram 苐 'One picture: It is the weight component of the basic composition of the water-soluble black ink. Mi第13页

Claims (1)

1274069 VI. Scope of Application Patent Application No. 1 · A water-soluble black ink composition comprising: 1 to 10% by weight of a water-soluble pigment; and 0.01 to 5% by weight of interfacial activity a preservative of 0.1 to 1% by weight; an organic solvent of 10 to 40% by weight; and a deionized by weight of 4 4 to 8 8 8 8 % by weight Water, wherein the organic solvent consists of a ketone and an alcohol. 2. The composition of the water-soluble black ink according to claim 1, wherein the surfactant is a nonionic or a zwitterionic surfactant. 3. The composition of the water-soluble black ink according to claim 1, wherein the organic solvent is composed of a ketone and an alcohol in a ratio of substantially 1:2 to enhance the black color. The stability of the ink composition. 4. The composition of the water-soluble black ink according to claim 1, wherein the ketone is selected from the group consisting of a 17 ketone, a methyl group ratio of 17 ketones, and a ketone. Specific σ ketone compounds or mixtures thereof. 5. The composition of the water-soluble black ink according to claim 4, wherein the ketone is a ketone having a heterocyclic ring. 6. The composition of the water-soluble black ink according to claim 1, wherein the alcohol is selected from the group consisting of a monoalcohol compound, a bisphenol compound or a mixture thereof. 7. The composition of the water-soluble black ink according to claim 6, wherein the monool compound and the diol compound have 1 to 5 carbon linear chains. Page 14 1274069_ VI. Scope of application for patents Alcohols. 8. A black ink composition for use in an ink jet printer comprising a water-soluble colorant solution and an organic mixed solvent of 10 to 40% by weight, wherein the organic solvent mixture It is composed of a ketone having a heterocyclic ring and an alcohol having one straight chain of 1 to 5 carbons in a ratio of substantially 1:2 to improve the stability of the black ink composition. 9. The black ink composition according to claim 8, wherein the ketone is selected from the group consisting of a sigma gamma and a monomethyl group. More than σ ketone, ° ketone ketone compound or a mixture thereof. The black ink composition of claim 8, wherein the alcohol is selected from the group consisting of a monoalcohol compound, a bisphenol compound, or a mixture thereof. 1. The black ink composition according to claim 8, wherein the water-soluble coloring solution comprises: a water-soluble pigment in an amount of from 1 to 10% by weight based on the weight of the black ink composition; The black ink composition is 0. 0 to 5% by weight of the surfactant; one by weight of the black ink composition is 0.1 to 1% of the preservative; and * is the weight of the black ink composition. Calculated as 44~8 8. 8 9% of deionized water. The black ink composition of claim 11, wherein the surfactant is a nonionic or a zwitterionic surfactant. 1 3, a composition of a water-soluble black ink comprising: Page 15 1274069_ VI. The scope of application of the patent is 1 - 10% by weight of water-soluble pigment; one by weight is 0. 0 5% of the surfactant; one by weight is 0. 1~1 a preservative of 100%; an organic solvent of 10 to 40% by weight; and a deionized water of 44 to 88.89 % by weight, wherein the organic solvent is a ketone having a heterocyclic ring and The alcohol having one to five carbon straight chains is composed of a ratio of substantially 1:2, and the ketone is selected from the group consisting of a pyrrolidone, a fluorenylpyrrolidone, a pyrrolidone compound or a mixture thereof. The alcohol is selected from the group consisting of a straight chain monool compound, a straight chain diol compound, or a mixture thereof. The black ink composition of claim 13, wherein the surfactant is a nonionic or a zwitterionic surfactant. 1 5. An organic mixed solvent for use in a water-soluble black ink composition, which is a ketone having a heterocyclic ring and an alcohol having one to five carbon straight chains, which is substantially 1: 2 a proportional composition for improving the stability of the black ink composition, wherein the ketone is selected from the group consisting of pyrrolidone, monomethylpyrrolidone, a pyrrolidone compound or a mixture thereof, and the alcohol is selected from the group consisting of An alcohol compound, a bisphenol compound or a mixture thereof. Page 16