JPH09316379A - Erasable colorant composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a colorant composition which has excellent erasability and which, when e.g. the dress is stained with it by mistake, does not dye it and can be easily erased by e.g. washing by mixing a bye having low direct dyeing properties with a water-soluble resin. SOLUTION: A lowly substantive dye (A) is mixed with a water-soluble resin (B) desirably in an A/B mixing ratio of at least 10% to obtain an erasable colorant composition. Component A used may be a reactive dye or an acid dye and is particularly desirably a reactive dye of e.g. type of dichlorotriazine, monochlorotriazine, vinyl sulfone, chloropyrimidine, dichloroquinoxadine or monochlorotriazine/vinyl sulfone difunctional group. Component B is desirably a polyethylene glycol, a polyalkylene compound, a polyvinyl alcohol or the like. The obtained composition can be used for use in Indian inks, painting colors, marking pen inks, etc.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention can be used as ink for ink, paint, marking pens, etc., and can be easily erased by washing with water when attached to a fiber aggregate such as cloth or nonwoven fabric. Colorant composition.

[0002]

2. Description of the Related Art Conventionally, there has been a problem that, for example, when ink and paint are adhered and fixed to a fiber assembly such as cloth such as clothes or non-woven fabric by mistake, they cannot be easily removed by washing.

On the other hand, if not only ink and paint but also ink for a marking pen or the like can be positively drawn on a fiber assembly such as clothing and easily erased, it can be used as a new coloring agent.

Conventionally, Japanese Patent Application Laid-Open No. 7-3197 discloses that a dye is reacted with a water-insoluble resin to form a water-insoluble composite, which is imparted with erasability by preventing dyeing on a fiber assembly.
Alternatively, the dye is covered with a water-insoluble resin to increase the particle size of the water-insoluble composite, thereby preventing the dye fibers from getting caught in the eyes and imparting erasability.

[0005]

However, in the former technique, it is necessary to purposely react the dye with a water-insoluble resin or the like. Further, in the latter technique, fixing on the writing surface becomes poor, and therefore, in order to prevent this, it is necessary to add a fixing agent to the ink component separately.

An object of the present invention is to realize the erasability by using a composite of a dye and a water-insoluble resin, and to prevent the dye from being dyed even if a coloring agent is accidentally attached to clothes or the like. The point is to provide an erasable colorant composition that can be easily erased by washing or the like.

[0007]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have found that a colorant composition obtained by dissolving a dye having a low direct dyeability and a water-soluble resin has erasability. I found it. In particular, at least 10% water-soluble resin
It has been found that the erasable colorant composition contained is preferable in achieving erasability. The invention according to claim 1 is an erasable colorant composition characterized by containing a dye having a low direct dyeing property and a water-soluble resin. The invention of claim 2 is an erasable colorant composition, characterized in that a dye having a low direct dyeing property contains at least 10% of a water-soluble resin.

[0008] The water-soluble resin to be added to the dye is not particularly limited as long as it is a water-soluble resin.
Water-soluble resins having one or more functional groups selected from H groups, COOH groups, SO ₃ H groups and salts are preferred. In the invention of claim 3, the water-soluble resin is OH group, COOH group, SO ₃
The erasable colorant composition according to claim 1, which is a water-soluble resin having one or more functional groups selected from groups and salts. That is, synthetic polyhydric alcohol-based, carboxylic acid (salt) -based, and sulfonic acid (salt) -based water-soluble resins are preferred. Specifically, polyethylene glycol, polyalkyleneoxy compound, polyvinyl alcohol, modified polyvinyl alcohol, polyacrylic acid, polyacrylic acid copolymer, polysulfonic acid, polysulfonic acid copolymer is preferable, and among them, polyethylene glycol is preferable. Optimal. In the invention of claim 4, the water-soluble resin is polyethylene glycol, polyalkyleneoxy compound, polyvinyl alcohol, modified polyvinyl alcohol, polyacrylic acid, polyacrylic acid copolymer, polysulfonic acid,
The erasable colorant composition according to claim 1, which is at least one of a polysulfonic acid copolymer. The invention of claim 5 is the erasable colorant composition according to claim 1, 2 or 3, wherein the water-soluble resin is polyethylene glycol.

As a result of examining the content of the water-soluble resin, particularly polyethylene glycol, as described above, at least 10
It was found that the effect becomes remarkable at the weight percent. If the proportion of water-soluble resin is lower than 10% by weight,
The water-soluble resin cannot take in the dye, and a part of the dye enters the fiber, resulting in poor erasability. Therefore, as described in claim 2, the amount of the water-soluble resin added is preferably at least 10 weight percent.

When the average molecular weight of the water-soluble resin added to the colorant is low, the colorant is likely to bleed and the length of the molecule of the resin that takes in the dye is short, so that the apparent molecular length of the dye taken in the resin is long. The length is also short, and it is considered that the fibers easily enter the fiber, which adversely affects the erasability.
Further, when the molecular weight is large, the aqueous solution has high viscosity, which is not preferable from the viewpoint of handling. The erasable colorant composition according to claim 4 or 5, wherein the polyethylene glycol has a molecular weight of at least 400, preferably 600 to 7,500. The average molecular weight in the present invention indicates a weight average molecular weight.

The term "dye having a low direct dyeability" as used in the present invention means a dye having a low diffusion of the dye into the fiber and a low interaction between the dye and the fiber in the system of the erasable colorant composition containing a water-soluble resin. All in all, it was found that specifically reactive dyes and acid dyes are preferable. The invention of claim 7 is the erasable colorant composition according to any one of claims 1 to 6, wherein the dye having a low direct dyeing property is either a reactive dye or an acid dye.

The direct dye was also examined, but it was found that the addition of a water-soluble resin, particularly polyethylene glycol, tends to deteriorate the erasability. The direct dye is an anionic dye that is dyed directly on the cellulose fiber and has a property called directness. The mechanism of dyeing on cotton is considered to be a bond by Van der Waals force, or a hydrogen bond between an amino group and a hydroxyl group in the dye molecule and a hydroxyl group of cellulose by the π electron system. Then, it is considered that the addition of polyethylene glycol lowers the surface tension of the dye solution and rather promotes the diffusion into the fiber, thereby increasing the stain power on the fiber. In addition, the basic dye does not show a noticeable improvement in erasability. On the other hand, the acid dye showed the same improvement in erasability as the reactive dye. This is considered to be because the dye portion of the reactive dye is an acid dye, and thus the factor of improving the erasability is the same as that of the reactive dye.

The reason why the colorant composition of the present invention has erasability is not clear, but one is that a dye having a low direct dyeability, preferably an acid dye or a reactive dye, is a mixture. However, since the dye part is wrapped in the water-soluble resin in such a form that the apparent size of the dye becomes large and cannot penetrate into the fiber through the surface of the fiber of the fiber assembly. it is conceivable that. In addition, since the dye with low direct dyeability is incorporated in the water-soluble resin, it prevents the reactive group of the dye from reacting with the fiber, and further, the water-soluble resin is between the cleaning liquid and the dye attached to the fiber. It is considered that this is because it has a function of lowering the surface tension, helping the dye to be separated from the surface of the fiber by the action of wetting and penetrating, and improving the erasability.

As described above, particularly effective dyes having low direct dyeability are acid dyes or reactive dyes. Among them, as a result of examining particularly effective dyes, dichlorotriazine type and monochlorotriazine Type, vinyl sulfone type, chlorpyrimidine type, dichlorquinoxazine type,
It has been found that the bifunctional type of monochlorotriazine and vinyl sulfone is preferred. Among them, monochlorotriazine type and vinyl sulfone type, especially monochlorotriazine type reactive dyes are most suitable. According to the invention of claim 8, the dye having a low direct dyeing property is any of dichlorotriazine type, monochlorotriazine type, vinyl sulfone type, chlorpyrimidine type, dichloroquinoxazine type, and bifunctional group type of monochlorotriazine and vinyl sulfone. The erasable colorant composition according to claim 1, which is a reactive dye. The invention according to claim 9 is the erasable colorant composition according to any one of claims 1 to 8, wherein the dye having a low direct dyeing property is a monochlorotriazine type or vinyl sulfone type reactive dye. The invention according to claim 10 is the erasable colorant composition according to any one of claims 1 to 8, wherein the dye having a low direct dyeing property is a monochlorotriazine type reactive dye.

The present invention does not need to cause a reaction between a water-insoluble resin and a dye as in the conventional case, and can be achieved only by mixing a water-soluble resin with the dye. Moreover, by using a water-soluble resin as the dye-incorporating resin, it is easy to secure fixation with the fiber, and it is not necessary to add a fixing agent as in the case of using a water-insoluble resin. Can also be added. That is, the water-soluble resin containing the dye has a hydroxyl group and the like, and is bonded to only the surface of the fiber, particularly a fiber having a large number of hydroxyl groups such as cotton, by a hydrogen bond, or a van der Waals force. Has a favorable effect. Further, such a hydrogen bond has a relatively weak bond, and the bond with the fiber can be easily broken by washing with water or the like.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The dye having low direct dyeability is not limited, but for example, trade name Cibacron Black
P-SG (Ciba Geigy), Cibacron Black P-2PD
(Ciba-Geigy), Cibacron Black F-2B (Ciba-Geigy), Cibacron GrayG-R-01 (Ciba-Geigy), Cibacron Blue PB (Ciba-Geigy), Ciba
cron Navy GR-E-01 (manufactured by Ciba Geigy), Cibacron Bl
ue FR (Ciba-Geigy), Cibacron Red PB (Ciba-Geigy), Cibacron Red 4G-EN (Ciba-Geigy), Cibacron Red FB (Ciba-Geigy), Ciba
cron Yellow P-6GS (Ciba Geigy), Cibacron Ye
llow 2G-E (manufactured by Ciba Geigy), Cibacron Yellow F-3
Monochrome triazine type reactive dyes such as R (Ciba Geigy), trade names Cibacron Black CN (Ciba Geigy), Cibacron Blue CR (Ciba Geigy), Cib
acron Red CR (manufactured by Ciba Geigy), Cibacron Yellow
Monofunctional triazine-vinyl sulfone bifunctional reactive dye such as CR-1 (manufactured by Ciba Geigy), Remazol Blac
k DEN Hi-Gran (manufactured by Dyster), Remazol Blue RU-N
Vinyl sulfone type reactive dyes such as Remazol Red RU-N (Dystar), Remazol Yellow RU-N (Dyster), trade name Levafix Navy Blue
E-BNA GRAN (by Dystar), Levafix BR.Red E-RN
A dichloroquinoxazine-type reactive dye such as (Dystar) and Levafix G Yellow EG (Dystar) can be used. In addition, CI number A.Bk.2 (product name Water
Black R-455), CI number A.Bk.119 (trade name Opal Bla
ck new conc Hodogaya Co., CI number AR87 (trade name)
Eosin), CI number AB9 (Product name Water Blue # 9)
Acid dyes such as

The addition amount of the dye having a low direct dyeability is not particularly limited. However, about 2 to 40% by weight is preferable, and 4
If it is added in an amount of more than 0% by weight, it cannot be completely contained in the water-soluble resin and adversely affects the erasability. On the other hand, if it is less than 2% by weight, the coloring is weak and it is not preferable.

The water-soluble resin is added to improve the erasability of the colorant, and is modified with polyethylene glycol, polyoxyethylene lauryl ether, polyoxyethylene oleic acid ester, polyoxyethylene nonylphenyl ether, carboxylic acid modification. In addition to polyvinyl alcohol, polyacrylic acid, sodium polystyrene sulfonate, polyvinyl alcohol, polyoxyethylene polyoxypropylene block polymer, polyoxyethylene alkyl ether, polyoxyethylene nonylphenyl ether, polyoxyethylene fatty acid ester,
Of polyglycerin fatty acid ester, polyoxyethylene sorbitan monooleate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monopalmitate, pullulan, polyacrylic acid itaconic acid copolymer One kind or a mixture of two or more kinds can be used, but polyethylene glycol is most suitable in consideration of erasability, price, handling and the like.

When the proportion of the water-soluble resin added to the colorant is low, the resin cannot take in the dye, and part of the dye gets into the fiber, resulting in poor erasability. Therefore, as described above, the content of the water-soluble resin is at least 1
It is preferably 0 weight percent.

The colorant composition includes a fixing agent, a bulking agent, a preservative, an antifungal agent, a fragrance, a surfactant, a pH adjusting agent, a viscosity adjusting agent, a dispersant, a water retention agent, a wetting agent, a defoaming agent, Leveling agent,
Viscoelasticity adjusting agents, anti-smearing agents, water, alcohol, and the like that are generally included in ink, paints, and marking pens can be included.

The erasable colorant composition of the present invention contains, for example, a dye having a low direct dyeability and a water-soluble resin as essential components, and is obtained by mixing them with water and dissolving them with stirring.

The colorant of the present invention can be used as ink, paint, ink and the like, and even if these are accidentally attached to clothes or the like, they do not penetrate into the fiber through the surface of the fiber. It can be easily erased.

The erasable colorant composition of the present invention can be used without any particular limitation as long as it is a fiber, but especially cotton, wool,
Nylon, vinylon, acetate, wool, rayon,
Effectively works on fibers such as acrylic, silk and polyester. In particular, in the case of a reactive dye, only the dye, a cellulose skeleton such as cotton or rayon, a fiber having an OH group such as a PVA skeleton such as vinylon, wool,
There is a tendency to dye with fibers having amines such as silk, and it is considered that some interaction (bond) occurs between the dye and the OH group or amine, but by adding a water-soluble resin, especially polyethylene glycol, The erasability is improved in almost all fibers.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments.

Example 1 20 g of polyethylene glycol (average molecular weight 3000) was dissolved in 50 ml of ion-exchanged water, and the product was traded under the trade name Cibacron Black while stirring at room temperature.
2.0 g of a reactive dye of P-SG (manufactured by Ciba Geigy) was added and sufficiently stirred to completely dissolve it to obtain a black colorant composition.

Example 2 20 g of polyethylene glycol (average molecular weight 3000) was dissolved in 50 ml of ion-exchanged water, and the product was traded under the trade name Cibacron Blue P with stirring at room temperature.
-B (manufactured by Ciba Geigy) was added with 2.0 g of a reactive dye, and the mixture was thoroughly stirred and completely dissolved to obtain a blue colorant composition.

Example 3 20 g of polyethylene glycol (average molecular weight 3000) was dissolved in 50 ml of ion-exchanged water, and the product was traded under the trade name Cibacron Yellow with stirring at room temperature.
2.0 g of a reactive dye of P-6GS (manufactured by Ciba Geigy) was added and sufficiently stirred to completely dissolve it to obtain a yellow colorant composition.

Example 4 20 g of polyethylene glycol (average molecular weight 3000) was dissolved in 50 ml of ion-exchanged water, and the product was traded under the trade name of Cibacron Red P- under stirring at room temperature.
2.0 g of a reactive dye of B (manufactured by Ciba Geigy) was added and sufficiently stirred to completely dissolve it to obtain a red colorant composition.

Comparative Example 1 A black colorant composition was obtained by removing the polyethylene glycol (average molecular weight 3000) in Example 1.

Comparative Example 2 A blue colorant composition was obtained by removing the polyethylene glycol (average molecular weight 3000) in Example 2.

Comparative Example 3 A yellow colorant composition was obtained by removing the polyethylene glycol (average molecular weight 3000) in Example 3.

Comparative Example 4 A red colorant composition was obtained by removing polyethylene glycol (average molecular weight 3000) in Example 4.

(Erasability Test) Next, using a water-free paint brush (flat brush No. 4) on a cotton broad test cloth, the colorant compositions of Examples 1 to 4 and Comparative Examples 1 to 4 above were used. Was applied and left at room temperature until it was dry to the touch. After drying, use a synthetic detergent in a washing machine (adjusted to 0.2%) at 25 ° C for 1 hour.
Washing was carried out for 5 minutes and then with water for 15 minutes. After drying, it was visually evaluated according to the following criteria. 4 or more passed as the erasable colorant composition. 5. . . Completely erased. 4. . . Almost erased. (It remains faint when seen through the light.) . . Although it is thinner than before washing and has an effect,
You can see the coating marks. 2. . . Although it is thinner than before washing, there is not much effect of washing. 1. . . Same as before washing.

[0034]

[Table 1]

From Table 1, it can be seen that the colorant compositions of Examples 1 to 4 using the dyes having low direct dyeability were completely or almost completely erased by washing. Further, it is recognized that the erasability is increased by mixing polyethylene glycol. In addition, the handwriting of each of the colorant compositions after being left to dry at the touch of the room temperature was sufficiently fixed on the cotton broad test cloth.

(Examples 5, 6 and Comparative Example 5) Next, a black colorant composition was obtained under the same conditions as in Example 1, except that the content of polyethylene glycol (average molecular weight 3000) was excluded. That is, polyethylene glycol (average molecular weight 3000) was added to 50 ml of ion-exchanged water, respectively.
While stirring 0 g, 5.0 g, and 15 g, each of which was stirred at room temperature, 2.0 g of a reactive dye of trade name Cibacron Black P-SG (manufactured by Ciba-Geigy) was added and thoroughly stirred to completely Dissolution was performed to obtain black colorant compositions of Comparative Example 5, Example 5 and Example 6, respectively.

As a result of the erasability test of these colorant compositions, the evaluation score of Comparative Example 5 was 3, whereas the evaluation scores of Example 5 and Example 6 were 4. Considering the results of Example 1 above, it is important to add a considerably large amount of polyethylene glycol, which is a water-soluble resin, and the content should be at least 1
It has been found that 0% by weight is necessary.

(Examples 7 to 11) Next, a black colorant composition was obtained using various water-soluble resins under the same conditions as in Example 1 except that polyethylene glycol (average molecular weight 3000) was changed. It was That is, in 50 ml of deionized water,
20g each of polyoxyethylene lauryl ether, polyoxyethylene nonyl phenyl ether, carboxylic acid modified polyvinyl alcohol, polyacrylic acid, and sodium polystyrene sulfonate are dissolved under stirring under room temperature, and the product name is Cibacron Black P-SG. 2.0 g of reactive dyes (manufactured by Ciba-Geigy) were added and sufficiently stirred to completely dissolve the dyes.
11 black colorant compositions were obtained.

As a result of the erasability test of these colorant compositions, the evaluation points of Examples 7 to 11 were all 4. Therefore, in addition to the polyethylene glycol of Example 1, the same tendency of improving the erasability was recognized for various water-soluble resins. Incidentally, the same erasability test was carried out on the dye aqueous solution under the same conditions except that the water-soluble resin was not added, and the evaluation points were all 3 points. Further, as a result of the erasability test similarly performed on the colorant composition containing cationized starch and polyallylamine as the other water-soluble resin, the evaluation point is between 3 and 4, and the erasability tends to be slightly low. It was As a result, among water-soluble resins,
In particular, it has been found that synthetic polyhydric alcohol-based, carboxylic acid (salt) -based, and sulfonic acid (salt) -based water-soluble resins are optimal.

(Examples 12 to 15) Next, black colorant compositions were obtained under the same conditions as in Example 1 except for the dye. That is, 20 g of polyethylene glycol (average molecular weight 3000) is dissolved in 50 ml of ion-exchanged water, and the product is manufactured under the trade name CI number A.Bk.2 (product name Water Bla.
ck R-455), CI number A.Bk.119 (trade name OpalBlack ne
w conc Hodogaya Co., Ltd., CI number AR87 (trade name Eosin), CI number AB9 (trade name WaterBlue # 9) 2.0g of each acid dye was added and sufficiently stirred to completely dissolve it. 12-15 black colorant compositions were obtained.

As a result of the erasability test of these colorant compositions, the evaluation points of Examples 12 to 15 were all 4. Particularly in Example 12, the evaluation score was 5.
On the other hand, CI number D.Bk.19 (product name Kayarus Black G con
c, manufactured by Nippon Kayaku Co., CI number DR225 (trade name Kayaru)
s Light Red F5G, manufactured by Nippon Kayaku Co., Ltd.) had an evaluation score of 1, and the erasability was further reduced as compared with the same dye aqueous solution having a evaluation score of 2. The basic dyes with CI number BR1 (trade name: Rhodamine 6GCP) and CI number BB116 (trade name: Kayaacryl Blue BGL) also had an evaluation score of 3.

From these results, in the case of the direct dye, the erasability tends to be deteriorated by the addition of the water-soluble resin. It is considered that this is because the direct dye is an anionic dye that is dyed directly to the cellulose fiber and has a property called directness. In other words, the dyeing mechanism for cotton is a combination of Van der Waals forces,
A hydrogen bond is considered to be formed between an amino group in a dye molecule, a hydroxyl group, and a hydroxyl group of cellulose in the π electron system. And by adding polyethylene glycol,
It is considered that this is because the surface tension of the dye solution is lowered and the diffusion into the fiber is promoted, so that if there is no phenomenon such as association, the stain power to the fiber is increased. Basic dyes do not show any noticeable improvement in erasability. On the other hand, the acid dye showed the same improvement in erasability as the reactive dye. This is because the reactive dye has a dye part that is an acid dye, and therefore the factor of improving the erasability is considered to be the same factor as the reactive dye.

(Examples 16 to 19 and Comparative Example 6) The average molecular weights of polyethylene glycol were 400 and 60, respectively.
Coloring agent compositions of Examples 16 to 19 were obtained under the same conditions as in Examples 1, 2, 3, and 4, except that the colorant compositions were 0, 5000, and 7500, respectively. For comparison, colorant compositions of Comparative Examples 6 and 7 were obtained under the same conditions as in Example 1 except that polyethylene glycol had an average molecular weight of 300 and 8000, respectively. An erasability test was performed on these colorant compositions under the same conditions as in Example 1. As a result, when the average molecular weight of polyethylene glycol was 300, the erasability test score was 3, and the average molecular weight of polyethylene glycol was 80.
When it was set to 00, the viscosity of the aqueous solution became high, which was not preferable in terms of handling. When the average molecular weight of polyethylene glycol is 400, the evaluation score of the erasability test is 4, and the average molecular weight is 600, 5000, 75 in particular.
In the case of 00, the evaluation points were all 5 and were good. In addition, when the average molecular weight of polyethylene glycol is set to 300, the erasability is lowered. When the average molecular weight of 300 or less, the water-soluble resin has a low average molecular weight, so that the colorant easily bleeds and the molecule of the resin incorporating the dye is Since the length of the dye is short, the apparent molecular length of the dye incorporated in the resin is short, and the dye easily enters the fiber, which is considered to have an adverse effect on the erasability. As a result, the desirable average molecular weight of polyethylene glycol is optimally at least 400, preferably 600 to 7500.

(Eraseability Test for Various Fibers) Next, J
1 IS interwoven fabric (cotton, nylon, vinylon, acetate, wool, rayon, acrylic, silk, polyester)
0 minutes, Examples 1, 2, 3, 4, 11, 12, 13, 1
It was immersed in the colorant composition of Example 4 to absorb the colorant composition. It was left at room temperature until it was dry to the touch. After drying, a synthetic detergent was used in the washing machine (adjusted to 0.2%) to wash at 25 degrees for 15 minutes, and then washed with water for 15 minutes. After drying, visually check the rest with 5 as in the above test.
The grade was evaluated. The JIS woven cloth was also washed at the same time during washing, and the contamination of other cloths during washing was also evaluated. As a result of evaluation by the above test, the evaluation points were 4 to 5 except for silk and some rayon, and the erasability was good. In addition, as a result of testing the dye aqueous solutions containing no water-soluble resin in the colorant compositions of Examples 1, 2, 3, 4, 11, 12, 13, and 14 for comparison, there are differences depending on the fibers, It became an evaluation score of 1-3. From this, it was confirmed that erasability was realized by washing by adding a water-soluble resin to the above dye. Also, the contamination was not contaminated except for a part of silk.

[0045]

As described above, the erasable colorant of the present invention comprises:
As in the past, without realizing the erasability of a dye with a water-insoluble resin, it is necessary to mix a dye with a low direct-dyeability and a water-soluble resin, and the coloring agent will not Even if it adheres, it is not dyed and can be easily erased by washing with water or washing with detergent. Therefore, it can be used as black ink, paint, marking pen ink, etc., which can be washed out with a simple composition, and greatly contributes to this field.

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Claims (13)

[Claims] 1. An erasable colorant composition comprising a dye having low direct dyeability and a water-soluble resin. 2. An erasable colorant composition comprising a dye having a low direct dyeing property and containing at least 10% of a water-soluble resin. 3. The water-soluble resin is OH group, COOH group, SO
The erasable colorant composition according to claim 1 or 2, which is a water-soluble resin having one or more functional groups selected from ₃ H groups and salts. 4. The water-soluble resin is polyethylene glycol, polyalkyleneoxy compound, polyvinyl alcohol, modified polyvinyl alcohol, polyacrylic acid,
The erasable colorant composition according to claim 1, 2 or 3, which is at least one of a polyacrylic acid copolymer, a polysulfonic acid, and a polysulfonic acid copolymer. 5. The erasable colorant composition according to claim 1, 2 or 3, wherein the water-soluble resin is polyethylene glycol. 6. The erasable colorant composition according to claim 4, wherein the polyethylene glycol has an average molecular weight of at least 400. 7. The erasable colorant composition according to claim 1, wherein the dye having a low direct dyeing property is either a reactive dye or an acid dye. 8. A dye having a low direct dyeing property is a dichlorotriazine type, a monochlorotriazine type, a vinyl sulfone type,
8. The erasable colorant composition according to claim 1, which is a reactive dye of any one of a chloropyrimidine type, a dichloroquinoxazine type, and a bifunctional group type of monochlorotriazine and vinyl sulfone. 9. The erasable colorant composition according to claim 1, wherein the dye having a low direct dyeability is a monochlorotriazine type or vinyl sulfone type reactive dye. 10. The erasable colorant composition according to claim 1, wherein the dye having a low direct dyeing property is a monochlorotriazine type reactive dye. 11. India ink containing the erasable colorant composition according to any one of claims 1 to 10. 12. A paint containing the erasable colorant composition according to any one of claims 1 to 10. 13. A marking pen ink containing the erasable colorant composition according to any one of claims 1 to 10.