JPH111646A - Erasable colorant composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a colorant composition which can be erased by simple washing by including at least a colorant and an eraser. SOLUTION: The eraser is selected among a polyethylene glycol (especially, one having a weight-average molecular weight of 600-7,000), a linear alkylbenzenesulfonate, a sodium higher alcohol sulfate and a polyoxyethylene derivative. The amount of use needs to be 5 wt.% or higher and is desirably 1/2 of that of the colorant (in terms of the solid matter). The colorant used is one represented by formula I (R is a dye group and is exemplified by formula II or formula III; n is 15 or above; x is 1-16; and the product of n and x is 30-200). For example, it is PALMER or VERSATINT (both are trademarks). The amount of use is 5-95 wt.% based on the entire of the colorant composition. The colorants having their respective colors need not be used separately and two or more colorants may be formulated to make various colors.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an erasable colorant composition. More specifically, the present invention relates to an erasable colorant composition in which the erasability of a colorant is further improved.

[0002]

2. Description of the Related Art Conventionally, a colorant composition uses a pigment or a dye as a colorant in order to give a color expression. However, there is a problem that stains and stains remain when the colorant composition is accidentally attached to clothes. Was. Many techniques have been disclosed for colorant compositions having excellent erasability in order to solve this problem, and washable marker inks having improved erasability of the colorant itself, colorants for fiber sorting, and the like have become publicly known. ing.

[0003]

However, although these erasable colorants are improved in erasability as compared with conventional colorants, they do not have such erasability that they can be completely erased by washing. In other words, when 40% aqueous solution, which is a form that is usually put on the market, is used as it is or diluted and used for ink, paint, ink, etc.,
Depending on the color, density, amount of attachment, etc.
In general, it is difficult to completely erase data by washing at home, and it is necessary to take measures such as extremely increasing the washing temperature or washing for a long time.

[0004] When a colorant composition is formed using these colorants, the erasability can also be improved by changing the composition of the colorant composition, such as by reducing the amount of the fixing agent contained. However, in this case, it is difficult to obtain a stable coating film when applied to an object to be coated, such as bleeding is likely to occur, and the original purpose of the colorant composition cannot be exhibited. Was causing.

As described above, a colorant composition which can sufficiently fulfill its original purpose as a colorant composition and is erasable by washing generally performed at home has not been developed yet. It is the current situation.

[0006] The object of the present invention is to solve the above-mentioned problem without completely deteriorating the purpose as a colorant composition, and even if it accidentally adheres to clothes, it can be completely washed by simple washing generally performed at home. An object of the present invention is to provide an erasable colorant composition that can be erased.

[0007]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have conducted intensive studies on the composition of the erasable colorant composition.
It has been found that irreversible erasability can be achieved by general laundry at home, irrespective of the color, density, and amount of colorant. The invention of claim 1 is an erasable colorant composition containing at least a colorant and an erasing agent.

The excellent erasability of the colorant composition of the present invention is attributable to the fact that the use of a colorant having a long molecular chain suppresses permeation into fibers and furthermore, the addition of an erasure agent. This is because a wet state is formed on the fiber, the micelle of the fiber is prevented from being squeezed, and the dye polymer that has permeated the fiber is easily flown out. The term "erasing agent" as used in the present invention refers to a substance that is water-soluble, has a low viscosity even when converted to an aqueous solution, and has a surface active effect or a wetting effect.

The reason that it is necessary to be water-soluble is based on the fact that the coloring agents shown below are generally provided as water-soluble, and in ordinary households, washing is performed using water as a solvent. Further, it can be assumed that a substance having a surfactant effect or a wetting effect is to promote the bonding between water as a solvent and the colorant fine particles during washing. The low viscosity is necessary because the colorant composition of the present invention is necessary to ensure its writing properties when used as ink or a marker ink, and the colorant composition itself It is not a direct reason to improve erasability.

Suitable erasing agents include polyethylene glycol, linear alkylbenzene sulfonate, higher alcohol sodium sulfate, and polyoxyethylene derivatives such as polyoxyethylene nonylphenyl ether and polyoxyethylene vitamin monolaurate. These compounds have excellent properties with respect to the conditions required for the erasing agent, and when added to a coloring agent to form a colorant composition, excellent erasability is realized.

The colorant in the colorant composition of the present invention means an easily erasable colorant which improves its erasability and has a small dyeing power on fibers. Is provided as
Therefore, the term “colorant” in the present invention does not mean all of dyes and pigments added to give a color expression. As a coloring agent particularly suitable for use in the present invention, a coloring agent represented by the following general formula can be exemplified.

Embedded image (However, R is a dye group, n is 15 or more, X is 1 to 16,
The product of n and X is 30 to 200)

That is, it is a water-soluble polymer surfactant having at least 15 repeating units in the molecule, has a molecular weight of at least 1,000, and has a dye group R bonded to a polymer chain.
Is a compound having The dye group R corresponds to a colored portion, and examples thereof include those represented by the following chemical formula.

[0013]

Embedded image

[0014]

Embedded image

As a specific coloring agent, Milliken Chem, which was originally used as a fiber sorting dye, is used.
and "PALMER", a marker ink manufactured by Milliken Chemical, under the trade name "VERSATINT". In the present invention, the use of these coloring agents is desirable, but not particularly limited.

The erasable colorant composition of the present invention is not particularly limited in its use, and can be widely used as a drawing material and the like. For example, it is excellent in use as ink, a marker ink and a paint. Even when various known additives are blended so as to be suitably used for this purpose, the erasability is not impaired.

[0017]

DETAILED DESCRIPTION OF THE INVENTION The present invention is an erasable colorant composition containing at least a colorant and an erasing agent.

The colorant is not particularly limited, but it is necessary that the colorant has a coloring effect, has a small dyeing power on fibers, is water-soluble, and has a low viscosity in the aqueous solution. Specifically, as described above, Milliken Chem, which was originally used as a fiber sorting dye, was used.
The brand name "VERSATINT" manufactured by Ical Co., Ltd. and the brand name "PALMER" manufactured by Milliken Chemical Company for a marker ink are preferably used.

The amount of the coloring agent is preferably 5 to 95% by weight (hereinafter simply referred to as "%") based on the entire coloring agent composition. Since these colorants are usually provided as a 40% aqueous solution, they are converted to a solid content of 2 to 38%.
Becomes Within these ranges, 10 to 95% (solid content 4 to 95%)
48%) is optimal. Exceeding this range will result in a high viscosity, possibly affecting other qualities, and below this range will result in insufficient concentration. The specific amount may be determined individually according to the concentration of the colorant and the use of the colorant.

It is not necessary to use a single colorant alone, and two or more colorants may be used to produce various colors. Specifically, for example, if a mixture of red and yellow colorants is used, an orange colorant composition can be produced.

As described above, it is necessary that the erasing agent is water-soluble, has a low viscosity even in the form of an aqueous solution, and has a surfactant effect or a wetting effect. Specifically, polyethylene glycol, linear alkylbenzene sulfonate, higher alcohol sodium sulfate, and polyoxyethylene derivatives such as polyoxyethylene nonylphenyl ether and polyoxyethylene vitamin monolaurate are preferred. Among them, polyethylene glycol having a weight average molecular weight of 600 or more and 7000 or less is most suitable. In addition, polyethylene glycol having a molecular weight exceeding 7000 is not preferable because the aqueous solution has high viscosity and lacks writing characteristics depending on the intended use.

The content of these erasing agents is about 5
%. Specifically, in order to improve the erasing effect, the colorant (solid content) is １ ／ of the colorant (solid content).
Or more is preferred. The upper limit of the amount is not particularly limited, but is preferably up to 150% based on the amount of the colorant (solid content). Excessive blending is not preferred because it results in high viscosity and may adversely affect other qualities depending on the application.

The colorant composition of the present invention may be diluted with water as needed to dissolve the erasing agent. The amount of water is 9
It is preferably 0% or less. If it is added in excess of this range, the concentration becomes insufficient, which is not preferred as a colorant. However, the dye described above (trade name "VERSATIN"
T "(Milliken Chemical Co.) is usually dealt with a 40% aqueous solution, so that it may not be necessary to particularly add water during production.

The erasable colorant composition of the present invention may contain, if necessary, a fixing agent, a bulking agent, a preservative, a fungicide, a fragrance,
Additives generally used for markers, ink, and paints, such as alcohols, viscosity modifiers, wetting agents, defoamers, and leveling agents, may be added. In addition, as a preservative, "Proxel XL-2" (manufactured by Zeneca) can be suitably used, and the addition amount is preferably in the range of 0 to 1%. As a fungicide, "Dencil P" (manufactured by Zeneca) can be exemplified as a preferable one, and the addition amount is preferably about 0 to 1%.

The erasable colorant composition of the present invention can be produced, for example, by the following procedure. First, an erasing agent and various additives are dissolved in water and stirred for 15 minutes. At this time, heating may be performed within a range for dissolving various additives and erasing agents. Thereafter, a necessary amount of a colorant is added, and the mixture is stirred for 30 minutes.

When water is not added, an erasing agent and an additive are directly added to a 40% aqueous solution of a commercially available coloring agent,
Stir for 5 minutes. At this time, heating may be performed within a range for dissolving various additives and erasing agents.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments. However, the present invention is not limited only to the examples.

(Blending Amount of Erasing Agent)
Product name “PALER” manufactured by Iken Chemical
A 40% aqueous solution (the values in the table are converted to solid contents) is diluted with water, and polyethylene glycol (weight average molecular weight: 3000) is added as an erasing agent little by little with stirring so that mamako cannot be formed in the amount shown in Table 1. And completely dissolved to obtain an erasable colorant composition.

[0029]

[Table 1]

(Molecular weight of erasing agent)
Product name “PALER” manufactured by Iken Chemical
A 40% aqueous solution (the values in the table are converted to solids) diluted with water to 20%, and agitated slightly with 20% of polyethylene glycol of Table 2 with a changed molecular weight as an erasing agent so that mamako is not formed. Was added and dissolved completely to obtain an erasable colorant composition.

[0031]

[Table 2]

(Erasability Test) The colorant compositions of Examples and Comparative Examples were directly applied to a cotton broad test cloth, left to dry to the touch at room temperature, dried, and then washed with a washing machine using a synthetic detergent (Kaosha). And the product name “Attack”) (adjusted to the concentration specified by the manufacturer) and wash at 20 ° C. for 15 minutes.
After washing with water, the condition of the cotton broad was evaluated by a visual test. The evaluation was evaluated as ○ when complete erasing was possible, Δ when the effect of improving erasability was not obtained but was not completely reduced, and × when the erasability was the same as that of the colorant alone. The results are shown in Tables 1 and 2.

(Writability test) Using the colorant compositions of Examples 5 to 9 and Comparative Examples 4 and 6, ink was produced using the following ratios and various additives, and the ink was used as a pen-paper for penmanship with a brush. I wrote it and examined its writing characteristics. The evaluation method was to determine whether or not bleeding occurred in the handwriting, whether or not the viscosity was too high and the writing characteristics were not impaired. Is represented as x, and the results are shown in Table 2 above. As a fungicide, "Dencil P" manufactured by Zeneca Corporation was used. In addition, a part shows a weight part. 65 parts of colorant compositions of Examples and Comparative Examples 100 parts of water 8 parts of polyvinyl alcohol having a weight average molecular weight of 3000 8 parts 1 part of antifungal agent

From the results shown in Table 1, it was found that it was necessary to increase the amount of polyethylene glycol as an erasing agent in accordance with the amount of the coloring agent. In particular, from Example 4, when the amount of the erasing agent is less than half the amount of the coloring agent, the erasing agent cannot be completely erased, and it is necessary to consider the amount of the erasing agent according to the amount of the coloring agent. It has been found.

Further, from the results shown in Table 2, it was found that when polyethylene glycol was used as the erasing agent, the erasing ability changed according to the molecular weight. Comparative Example 4 having a molecular weight of 600 or less has an effect on erasability, but cannot be completely erased, and Examples 5 to 9 having a molecular weight of 600 or more were used.
In Comparative Example 6, the erasability was improved. However, in Comparative Example 6 having a molecular weight of more than 7000, although the erasability was ensured, the writing characteristics were impaired, and a result unfavorable for use as an ink composition was obtained.

[0036]

The present invention is an erasable colorant composition containing at least a coloring agent and an erasing agent, so that even if it is erroneously attached to clothes or the like, it is completely erased by washing generally performed at home. can do.

Claims (7)

[Claims] 1. An erasable colorant composition comprising at least a colorant and an erasing agent. 2. The method according to claim 1, wherein the erasing agent is any one of polyethylene glycol, linear alkylbenzene sulfonate, higher alcohol sodium sulfate and polyoxyethylene derivative.
The erasable colorant composition according to claim 1, which is as described above. 3. The erasable colorant composition according to claim 2, wherein the weight average molecular weight of the polyethylene glycol according to claim 2 is from 600 to 7000. 4. The erasable colorant composition according to claim 1, wherein the colorant is a compound represented by the following general formula. Embedded image (Where R is a dye group, n is 15 or more, X is 1 to 16,
The product of n and X is 30 to 200) 5. Black ink containing the erasable colorant composition according to claim 1. 6. A paint containing the erasable colorant composition according to claim 1. 7. An ink for a marking pen, comprising the erasable colorant composition according to claim 1.