KR101748753B1 - Hydrochromic ink composition - Google Patents

Abstract

The present invention relates to a water-based color ink composition, which is excellent in storage stability, storage stability and visibility, and exhibits an effect as an excellent absorption marker, and further has improved viscosity and printability .

Description

HYDROCHROMIC INK COMPOSITION [0001]

More particularly, the present invention relates to a water-colorable ink composition having excellent heat and humidity resistance, light fastness and visibility, and improved viscosity and printing workability.

Water discoloration Ink compositions are ink compositions that change color when touched and when they are not exposed to water. Such water-based color ink compositions have been widely used particularly as absorbance markers in disposable absorbent articles such as diapers, training pants, urinary incontinence pads, and the like.

The conventional water discolouring ink composition is sensitive to high temperature to high humidity conditions and is not excellent in storability and printing workability and visibility is also poor. In order to solve such a problem, Korean Patent Laid-Open No. 10-2015-0051219 discloses an ink composition comprising a leuco dye; Color developer; Sensitizer; bookbinder; And an organic solvent. However, there is still a need for a water-colorable ink composition which is improved in exothermic, humidity, printing workability and the like.

It is an object of the present invention to provide a water-colorable ink composition for solving the problems of the prior art described above, which is excellent in heat and humidity, light fastness and visibility, and improved in viscosity and excellent in printing workability.

As a technical means for achieving the above technical object, one object of the present invention is to provide a pigment composition comprising 0.01 to 10% by weight of a pigment; 0.5 to 35% by weight of a dye; 5 to 40% by weight of resin; And 30 to 80% by weight of a solvent; Wherein the resin comprises a mixture of a ketonic compound and a cellulosic compound.

It is another object of the present invention to provide a disposable absorbent article in which the water-fading ink composition is printed.

The water-based color ink composition according to the present invention is excellent in storage stability and visibility due to high temperature and humidity, light resistance, and exhibits an effect as an excellent absorption marker and further facilitates a printing operation with excellent viscosity.

Fig. 1 shows the color change test results of the water-color fading ink compositions according to Examples 1 to 3 of the present application.

Throughout this specification, when an element is referred to as "including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise. The terms "about "," substantially ", etc. used to the extent that they are used throughout the specification are intended to be taken to mean the approximation of the manufacturing and material tolerances inherent in the stated sense, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure. The word " step (or step) "or" step "used to the extent that it is used throughout the specification does not mean" step for.

The present invention relates to a water-based color ink composition.

One embodiment of the invention relates to a water-based color ink composition comprising a pigment, a dye, a resin and a solvent.

Pigment

In one embodiment of the present invention, the pigments capable of controlling the color of the water-color fading ink composition include various pigments used in printing ink, ink-jet ink and the like, and specifically include water-soluble azo pigments, insoluble azo pigments, Anthanthrone pigments, anthanthrone pigments, anthanthrone pigments, anthanthrone pigments, anthanthrone pigments, anthanthrone pigments, anthanthrone pigments, anthanthrone pigments, ) Pigments, indanthrone pigments, pravantron pigments, pyranthrone pigments, diketopyrrolopyrrole pigments, and the like. Examples of the inorganic pigments include metallic compounds such as metal oxides and metal complex salts. Specific examples of the inorganic pigments include oxides of metals such as iron, cobalt, aluminum, cadmium, lead, copper, titanium, magnesium, chromium, Oxide, carbon black and the like.

Particularly, the organic pigments and inorganic pigments include compounds classified as pigments in the Color Index (published by The Society of Dyers and Colourists), and more specifically, those having the following color index (CI) numbers Pigments, but are not limited thereto.

C.I. Pigment Yellow 13, 20, 24, 31, 53, 74, 83, 86, 93, 94, 109, 110, 117, 125, 137, 138, 139, 147, 148, 150, 153, 154, 166, 173 , 180 and 185;

C.I. Pigment Orange 13, 31, 36, 38, 40, 42, 43, 51, 55, 59, 61, 64, 65 and 71;

C.I. Pigment Red 9, 97, 105, 122, 123, 144, 149, 166, 168, 176, 177, 180, 192, 208, 215, 216, 224, 242, 254, 255 and 264;

C.I. Pigment Violet 14, 19, 23, 29, 32, 33, 36, 37 and 38;

C.I. Pigment Blue 15 (15: 3, 15: 4, 15: 6, etc.), 21, 28, 60, 64 and 76;

C.I. Pigment Green 7, 10, 15, 25, 36, 47 and 58;

C.I. Pigment Brown 28;

C.I. Pigment Black 1 and 7 and the like.

The above-exemplified pigments may be used alone or in combination of two or more.

The pigment is preferably used as a pigment dispersion in which the particle size is uniformly dispersed. Examples of a method for uniformly dispersing the particle diameter of the pigment include a method of dispersing the pigment by incorporating a pigment dispersant. According to this method, a pigment dispersion in which the pigment is uniformly dispersed in a solution can be obtained.

Specific examples of the pigment dispersant include cationic surfactants, anionic surfactants, nonionic surfactants, amphoteric surfactants, polyester surfactants, and polyamine surfactants. These surfactants may be used alone or in combination of two or more.

The content of the pigment in the water-based color ink composition is preferably 0.01 to 10% by weight, more preferably 0.05 to 5% by weight, and even more preferably 0.1 to 1% by weight based on the water-colorable ink composition .

When the content of the pigment in the water-based discolouration ink composition is within the above range, it is possible to prevent the problem that the color of the ink does not change even if the water comes in contact with the water, and the printing viscosity is also excellent.

dyes

In one embodiment of the present invention, the dye of the water-based discolouration ink composition may be used without limitation as long as it can change color in contact with moisture.

Examples of the dye include, but are not limited to, benzofuran, lactone, fluorane, and aniline compounds.

The above-exemplified dyes may be used alone or in combination of two or more.

The content of the dye in the water-colorable ink composition is preferably 0.5 to 35% by weight, more preferably 1 to 10% by weight, and still more preferably 3 to 5% by weight based on the water-colorable ink composition .

When the content of the dye in the water-based discolouration ink composition is within the above range, it is possible to prevent the problem that the ink printed on the printing body contaminates the printing substrate, and it is preferable that the stability against the water-side reaction of the ink is excellent.

Suzy

In one embodiment of the present invention, the resin of the water-color fading ink composition may be a mixture of a ketonic compound and a cellulose compound.

The ketonic compound may be used without limitation as long as it is capable of imparting suitable viscosity and ease of operation to the water-swellable ink composition and suitable printing properties for the disposable absorbent article.

As the cellulose-based compound, cellulose nitrate, cellulose acetate, cellulose acetate propionate, and cellulose acetate butyrate can be used.

In one embodiment of the present invention, the ketonic compound and the cellulose-based compound are mixed in a weight ratio of 1: 1 to 1: 2 as the resin of the water-color fading ink composition. If the resin of the water-based discolouration ink composition is less than 1: 1 on a weight% basis, the viscosity may be so low that an undesired portion can be printed on the substrate, and the sharpness of the printed pattern is also poor, Lt; / RTI > In addition, when the resin of the water-color fading ink composition is more than 1: 2 on the basis of the weight%, the viscosity is so strong that printing may not be performed on the printing medium, resulting in a problem of printing metastability, It is possible to cause printing blocking at the printing area, and other problems such as clogging and degradation of the printing density may occur.

The content of the resin in the water-based color ink composition is preferably 5 to 40% by weight, more preferably 10 to 33% by weight, and even more preferably 20 to 25% by weight based on the water-colorable ink composition .

When the content of the resin in the water-discoloring ink composition is within the above range, it is possible to prevent the problem of weakening the adhesive force to the printing medium, and it is preferable from the viewpoint of storage stability and viscosity of the ink.

menstruum

In one embodiment of the present invention, the solvent of the water-color fading ink composition may be used without limitation as long as it can dissolve the pigment, the dye and the resin.

Examples of the solvent include alcohols such as ethanol, isopropanol, 2-propoxyethanol and terpineol, ketones such as acetone, acetates such as butyl carbitol acetate, and ethoxyacetyl chloride.

The content of the solvent in the water-based color ink composition is preferably 30 to 80% by weight based on the water-colorable ink composition.

additive

In one embodiment of the present invention, the water-color fading ink composition may be used in combination with an additive such as an emulsifier, a dispersant, a thickener, and a plasticizer according to needs of those skilled in the art, as long as the object of the present invention is not impaired.

The emulsifier is specifically selected from the group consisting of glyceryl myristate, glyceryl monostearate, glyceryl monoisostearate, glyceryl monooleate, glyceryl dioleate, glyceryl distearate, diglyceryl monostearate, monooleic acid Examples of the nonionic surfactant include polyglyceryl monooleate, diglyceryl glycol dioleate, diglyceryl dioleate, diglyceryl monoisostearate, diglyceryl triisostearate, tetraglyceryl monostearate, tetraglyceryl monooleate, tetraglyceryl trimellitate, Glyceryl pentaerythritate, tetraglyceryl pentaerythritol, hexaglyceryl monolaurate, hexaglyceryl monomyristate, hexaglyceryl monostearate, hexaglyceryl monooleate, hexaglyceryl tristearate, hexaglyceryl tetrabehenate Polyglyceryl pentaerythritol, hexaglyceryl pentaerythritol, hexaglyceryl pentaerythritol, hexaglyceryl poly Decaglyceryl monolaurate, decaglyceryl monolaurate, decaglyceryl monolaurate, decaglyceryl monolaurate, decaglyceryl monolaurate, decaglyceryl monostearate, and the like.

The dispersant may be, for example, a polyester-polyamine copolymer, but is not limited thereto.

The thickening agent may be, for example, polyacrylic acid and its crosslinked copolymer, polyvinyl alcohol, polyvinyl pyrrolidone and derivatives thereof, polyvinyl methyl ether and derivatives thereof, but is not limited thereto.

Specific examples of the plasticizer include phthalic acid esters, alkylsulfonic acid phenyl esters, adipic acid, phosphates, and citrates, but the present invention is not limited thereto.

The content of the additive in the water-based color ink composition is preferably 0.1 to 10% by weight based on the water-colorable ink composition.

The water-based color ink composition of the present invention can be produced using various conventional methods. For example, the above components may be mixed and mixed, mixed and stirred with a stirrer such as a dissover, and then dispersed and stabilized.

One embodiment of the present invention relates to a disposable absorbent article in which the water-fading ink composition is printed. The disposable absorbent article includes, but is not limited to, an absorbent sheet, a diaper, an underwear pad, a face mask, a filtering device, a sanitary napkin, a tampon, a panty shield, and a urinary incontinence pad.

The water-based color ink composition of the present invention can be printed on the disposable absorbent article using various conventional methods. For example, gravure printing, screen printing, offset printing, pad printing and transfer may be used, but the present invention is not limited thereto.

Hereinafter, the effects of the water-discoloring ink composition according to the present invention will be specifically confirmed through examples. However, the present invention is not limited by the following examples.

Examples 1 to 3 and Comparative Examples 1 to 3: Preparation of a water-color fading ink composition

A water-based color ink composition was prepared in a weight ratio as shown in Table 1 below.

First, the resin and the solvents (D-1 to D-3) were stirred at an ambient temperature for 1 hour and 30 minutes with an impeller rotating at a speed of 150 rpm. After the pigment was added to the mixture of the resin and the solvent, . At this time, a pulverizing blade was used as a stirring blade. After adding the dye and the solvent (D-4 to D-5), the mixture was stirred at room temperature for 1 hour with an impeller rotating at a speed of 200 rpm, and a high-speed blade was used as a stirring blade.

Example  One
(g) Example  2
(g) Example  3
(g) Comparative Example  One
(g) Comparative Example  2
(g) Comparative Example  3
(g) Pigment A-1 5 - - 5 - - A-2 - 5 5 - 5 5 dyes B-1 95 - 95 95 - 95 B-2 - 95 - - 95 - Suzy C-1 300 300 300 750 - - C-2 450 450 450 - 750 - C-3 - - - - - 750 menstruum D-1 600 600 600 600 600 600 D-2 350 350 350 350 350 350 D-3 100 100 100 100 100 100 D-4 500 500 500 500 500 500 D-5 350 350 350 350 350 350

A-1: Pigment Blue 15: 4

A-2: Pigment Yellow 74

B-1: 2 '- (dibenzylamino) -6' - (diethylamino) furan

B-2: Crystal violet lactone

C-1: Cyclohexanone-formaldehyde (1: 1, CAS # 25054-06-2, Resine Itallane s.r.l.)

C-2: Cellulose acetate propionate (CAS # 9004-39-1, Eastman Chemical Company)

C-3: Beckacite F-896 (CAS # 9003-35-4)

D-1: Ethanol

D-2: Acetone

D-3: 2-propoxyethanol

D-4: Isopropanol

D-5: Acetone

Experimental Example 1: Observation of color change and visibility

The water color fading ink compositions obtained in Examples 1 to 3 and Comparative Examples 1 to 3 were gravure printed on a disposable diaper. Thereafter, distilled water (H ₂ O) was contacted with the printed portion of the water-color fading ink composition for 20 to 40 seconds to observe the change in color, and the maximum distance at which the color change was observed was measured.

As shown in Table 2 and FIG. 1, the water-color fading ink compositions of Examples 1 to 3 were changed in color, and visibility was also superior to that of the water color ink compositions of Comparative Examples 1 to 3.

Experimental Example 2: Measurement of Heat and Humidity

The water color fading ink compositions obtained in Examples 1 to 3 were gravure printed on a disposable diaper. Thereafter, the disposable diaper was allowed to stand in an environment of 40 DEG C and a relative humidity of 60%, and the time at which the printed portion of the water-color fading ink composition began to be discolored was measured. As shown in Table 2 below, the water discoloration ink compositions of Examples 1 to 3 were superior to the ink compositions of Comparative Examples 1 to 3 in terms of high temperature and high humidity.

Experimental Example 3: Measurement of light resistance

The water color fading ink compositions obtained in Examples 1 to 3 were gravure printed on a disposable diaper. Thereafter, the disposable diaper was light-exposed in a Q-SUN Xenon Test Chamber, and the time at which the printed portion of the water-based color ink composition began to discolor was measured. As shown in the following Table 2, the water discoloration ink compositions of Examples 1 to 3 were also excellent in light resistance.

Experimental Example 4: Viscosity Measurement

The water color fading ink compositions obtained in Examples 1 to 3 were gravure printed on a disposable diaper. Thereafter, the measurement was carried out using Cup Cup 2 (Zhan Cup # 2) which is commonly used for viscosity measurement of the ink composition.

As shown in Table 2 below, the water discolouring ink compositions of Examples 1 to 3, in which the ketonic compound and the cellulose compound were mixed at a ratio of 1: 1.5 on a weight% basis, were compared with those of Comparative Examples 1 to 3 (20 seconds, Zhan Cup # 2) to the extent that printing workability was easy, as compared with the water discoloration ink composition of the present invention.

Color change Visibility Exodus Light resistance viscosity Example 1 Look ->
blue 5m 5 hours 144 hours 20 seconds Example 2 Abstract ->
yellow 5m 5 hours 144 hours 20 seconds Example 3 Orange ->
yellow 5m 5 hours 144 hours 20 seconds Comparative Example 1 Look ->
blue 1m 3 hours 100 hours 10 seconds Comparative Example 2 Abstract ->
yellow 1m 3 hours 100 hours 50 seconds Comparative Example 3 Orange ->
yellow 1m 3 hours 100 hours 40 seconds

It will be understood by those of ordinary skill in the art that the foregoing description of the embodiments is for illustrative purposes and that those skilled in the art can easily modify the invention without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

Claims (9)

0.01 to 10% by weight of pigment;
0.5 to 35% by weight of a dye;
5 to 40% by weight of resin; And
30 to 80% by weight solvent; Lt; / RTI >
The resin comprises a mixture of a ketonic compound and a cellulosic compound,
The ketonic compound comprises a mixture of cyclohexanone and formaldehyde,
Wherein the weight ratio of the ketonic compound to the cellulosic compound is from 1: 1 to 1: 2.
Water color ink composition. The method according to claim 1,
Wherein the pigment is selected from the group consisting of Pigment Yellow, Pigment Orange, Pigment Red, Pigment Violet, Pigment Blue, Pigment Green, Pigment Brown and Pigment Black.
Water color ink composition. The method according to claim 1,
Wherein the dye is selected from the group consisting of benzofuran, lactone, fluororan and aniline compounds.
Water color ink composition. delete The method according to claim 1,
Wherein the solvent is selected from the group consisting of ethanol, isopropanol, 2-propoxyethanol, terpineol, acetone, butyl carbitol acetate and ethoxyacetyl chloride.
Water color ink composition. The method according to claim 1,
An additive selected from the group consisting of emulsifiers, dispersants, defoamers, thickeners and plasticizers.
Water color ink composition. A disposable absorbent article printed with a water-based fountain ink composition according to any one of claims 1 to 3, 5, and 6. 8. The method of claim 7,
Wherein the disposable absorbent article is selected from the group consisting of an absorbent sheet, a diaper, an underwear pad, a face mask, a filtering device, a sanitary napkin, a tampon, a panty shield,
Disposable absorbent article printed with a water-based color ink composition. 8. The method of claim 7,
Wherein the water-based discolouration ink composition is printed using gravure printing,
Disposable absorbent article printed with a water-based color ink composition.

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