JPH1180627A - Solid retouching agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a solid retouching agent which can visually judge with ease whether or not, after a letter or the like to be retouched is coated with the solid retouching agent, the coating has been fully dried by incorporating a color dye having in its molecule a carboxyl group and capable of developing a green, blue, purple, or red color in the presence of water, a gel-forming material, and a white pigment. SOLUTION: A color dye having in its molecule a carboxyl group and capable of developing a green, blue, purple, or red color in the presence of water is compounded in an amt. of 0.002 to 0.1 wt.%, pref. 0.005 to 0.05 wt.%, with 5 to 30 wt.%, pref. 8 to 20 wt.%, gel-forming material comprising an alkali metal or ammonium salt of an 8-36C, pref. 12-18C, aliph. carboxylic acid and 25 to 70 wt.%, pref. 35 to 50 wt.% white pigment, not more than 40 wt.%, pref. 25 to 35 wt.%, water and optionally 0.1 to 30 wt.%, pref. 0.5 to 20 wt.%, water-soluble resin having an average degree of polymn. of 100 to 3,000, pref. 100 to 1,500.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention corrects characters and numbers written with a ball-point pen or a fountain pen, or characters printed on various printing machines, so that these characters become invisible from the surface. It relates to a solid state modifier.

2. Description of the Related Art Various modifiers such as a liquid modifier, a solid modifier, and a tape modifier are commercially available as modifiers for letters and the like. A liquid or solid modifier is applied on the character or the like to be modified, and a tape-shaped modifier is applied on the character or the like to be modified to reduce the hiding power of the white pigment contained in the modifier. By using it, the characters to be corrected are not seen from the outside, and the correct characters etc. are described on it. Among these, the solid correction agent has the advantage that it is easier to handle than the liquid correction agent, and the drying time after application on characters or the like to be corrected is short. However, after applying the solid correction agent on the character or the like to be corrected, and before writing the correct solid correction agent before the applied solid correction agent is sufficiently dried, the film of the applied solid correction agent is broken, There are problems such as dirty characters and clogging of the pen tip. In particular, visually, it is much more difficult to determine whether or not it is dry than with a solid modifier than with a liquid modifier. Therefore, it is desired to solve the above-mentioned problem particularly with respect to a solid modifier.

[0002]

DISCLOSURE OF THE INVENTION The present invention relates to a solid correction agent which can be applied to a character or the like to be corrected and then determined by checking whether the applied solid correction agent has dried sufficiently. The purpose is to provide.

SUMMARY OF THE INVENTION The present invention is based on the finding that the above-mentioned problems can be solved by using a specific organic color former which forms a specific color in the presence of water together with a gel-forming substance and a white pigment. It was based on that. That is, the present invention has a carboxyl group in the molecule, and in the presence of water, green, blue, purple or red to form a coloring pigment, a gel-forming substance and a white pigment characterized by containing a white pigment Provide a corrector.

[0003]

BEST MODE FOR CARRYING OUT THE INVENTION As a color-forming dye which has a carboxyl group in the molecule and develops green, blue, purple or red in the presence of water, an alkylphenolphthalein PH indicator having a carboxyl group is used in the present invention. It is preferred that In particular, those in which the acidic color is colorless and the alkaline color is green, blue, purple or red are preferable. Further, it is preferably water-soluble. Examples of such color-forming dyes include 2,5-dialkylphenols described in JP-A-48-13351 (the number of carbon atoms of an alkyl group is 1
To 5, preferably 1 to 3) and trimellitic anhydride in the presence of a Friedel-Crafts catalyst. The contents disclosed in JP-A-48-13351 are included in the description of the present specification. Particularly preferred chromogenic dyes are carboxythymolphthalein (CTP) and bromocarboxythymolphthalein (BCTP).

In the present invention, as long as the solid modifier is green, blue, purple or red before being applied on the character or the like to be modified, it is colorless when the solid modifier is sufficiently dried after application. The amount of the chromogenic dye in the solid modifier can be arbitrarily determined, but the amount of the chromogenic dye is 0.002-0.1% by weight.
(Hereinafter abbreviated as%), and more preferably 0.005 to 0.05%. As the gel-forming substance used in the present invention, an aliphatic carboxylate is preferable. Examples of such an aliphatic carboxylate include an alkali metal salt or an ammonium salt of a branched or unbranched aliphatic carboxylic acid having 8 to 36 carbon atoms. Particularly, an aliphatic carboxylate having 12 to 18 carbon atoms is preferable. As the aliphatic carboxylic acid constituting the aliphatic carboxylate, for example, caprylic acid, pelargonic acid, capric acid, undecanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid,
Mention may be made of behenic acid, lignoceric acid, cerotic acid, montanic acid and melicic acid.

As the alkali metal salt of the aliphatic carboxylic acid, lithium salt, sodium salt and potassium salt can be used, and sodium myristate, sodium palmitate, sodium stearate or a mixture thereof is particularly preferable. The amount of the gel-forming substance used is 5 to 30% based on the total weight of the solid modifier of the present invention.
And more preferably 8 to 20%. Examples of the white pigment used in the present invention include titanium oxide, zinc white, lead white, zinc sulfide, antimony oxide, alumina white, satin white, calcium carbonate, and barium sulfate. Titanium oxide is particularly preferable. The white pigment is 25 to 70% based on the total weight of the solid modifier of the present invention.
It is preferably used, more preferably 35 to 50%.

In the present invention, the balance can be water, but the amount of water in the solid modifier is preferably at most 40%, more preferably 25-35%. In the present invention, when the above components are blended, the entire solid state modifier can be made alkaline, and if it matches the coloration range of the chromogenic dye, calcium hydroxide, sodium hydroxide, potassium hydroxide, etc. Although the addition of an alkali agent is not required (may be added as necessary), if the entire solid correction agent does not become alkaline, an alkali agent is added to make the entire solid correction agent alkaline, In addition, it must be matched with the color gamut of the chromogenic dye. The solid modifier of the present invention can further contain a water-soluble resin, silica, and the like.

The water-soluble resin generally has an average degree of polymerization of 1
00 to 3000, preferably 100 to 1500 natural resins or synthetic resins. The amount of water-soluble resin used is
It is preferably 0.1 to 30%, more preferably 0.5 to 20%, based on the total weight of the solid modifier of the present invention,
By using a water-soluble resin in this range, the surface to which the solid modifier is applied is strengthened, and the applied surface is hardly peeled off even if rubbed against something. The following are specific examples of the water-soluble resin. For example, natural polymers such as gum arabic and dextrin, cellulosic semisynthetic polymers such as methylcellulose, ethylcellulose, hydroxyethylcellulose and carboxymethylcellulose and synthetic polymers such as polyvinylpyrrolidone, polyvinyl alcohol, polyvinyl acetate and acrylic emulsion.

[0008] The silica may contain hydrophobic or hydrophilic silica. Of these, hydrophobic silica refers to fine particles of silicon dioxide having a high purity, the surface of which is hydrophobic. Not only those whose surface has been subjected to hydrophobic treatment in advance, but also the solid state of the present invention. Includes those that became hydrophobic during preparation of the modifier. In addition, the hydrophobic silica whose surface has been hydrophobized in advance includes Rheoseal MT-
10 (Soda Tokuyama), Nipsil SS hydrophobic silica (Nippon Silica Industry Co., Ltd.) and Aerosil R-972 hydrophobic silica
(Nippon Aerosil Co., Ltd.), which is commercially available.
Examples of hydrophilic silica include Toksil (Tokuyama Soda Co., Ltd.), Silicasil (Bayer), Harmic (Micron Corp.), Aerosil Elsil (Nippon Aerosil Co., Ltd.), and Nipsil (Nihon Silica Kogyo Co., Ltd.) , Syloid (Fuji Devison Chemical Co., Ltd.),
Microsilica (Elchem) and the like. Silica is preferably contained in the solid modifier of the present invention in an amount of 0.5 to 20%, more preferably 1 to 10%. Particularly as silica, the particle diameter is 0.02 to 15 mμ,
Fine particles having a specific surface area of 1 to 700 m ² / g are preferred.

In particular, when hydrophobic silica is used, the fluidity, viscosity and thixotropy of the solid modifier of the present invention are improved, so that the coatability is improved. The ink film dries easily, and the ink paste becomes good. Further, in order to make the coating on the coated surface of the present invention flexible, a humectant such as a polyhydric alcohol such as glycerin, alcohol ether and ethanolamine may be added to the solid modifier of the present invention in an amount of 0 to 6%. You may make it contain. Preferably, 1-6
%. In the present invention, in order to adjust the degree of whiteness of the white pigment, ferric oxide and the like can be added.
A thiazoline preservative such as -benzoisothiazolin-3-one can also be added. If necessary, an extender such as kaolin clay can be added.

[0010] The production of the solid state modifier of the present invention is, for example,
First, an aliphatic carboxylate or the like (in the case of using a water-soluble resin, together with the aliphatic carboxylate) is dissolved in a predetermined amount of water by heating to about 90 ° C. under reflux while stirring, and then dry-dispersed in advance. After adding the other ingredients and stirring,
It can be easily carried out by injecting the solid modifier into an extruded container, or by solidifying by cooling or extrusion, and inserting the resulting rod-shaped material into a closed container with a cap. The solid modifier of the present invention can be in any form, such as a cylinder or a prism. In particular, it is preferable to mold the product into a columnar shape and use it in a writing implement described in Japanese Patent Publication No. 9-503537.

[0011]

According to the present invention, after the solid corrector is applied on the character or the like to be corrected, the water in the applied solid corrector evaporates and absorbs the carbon dioxide gas in the air. When it becomes acidic from the property, the color of the solid corrector disappears, the color becomes white due to the white pigment, and the advantage that the applied solid corrector can be easily observed by visual observation that it has dried can be obtained. . Therefore, the solid correction agent of the present invention can confirm the dry state very easily.Before the solid correction agent is sufficiently dried, the coating of the solid correction agent applied for the first time to be written is broken or described again. Problems such as dirty characters can be easily avoided. Next, the present invention will be described with reference to examples.

[0012]

【Example】

Example 1 30 parts by weight of water, 16 parts by weight of sodium stearate,
2 parts by weight of sodium myristate, methyl cellulose 1
Parts by weight, 1 part by weight of polyvinylpyrrolidone, glycerin 4
Parts by weight, 1,2-benzoisothiazolin-3-one 0.03
Parts by weight, triethanolamine 1 part by weight, carboxythymolphthalein 0.005 parts by weight, calcium hydroxide 0.5 part by weight.
While stirring 5 parts by weight, the mixture was heated to about 90 ° C. under reflux to dissolve, and the other components described in Table 1 which had been dry-dispersed in advance were added and stirred. And solidified by cooling.
No. 537, the solid state modifier of the present invention was prepared by accommodating it in the writing implement shown in FIG. The appearance of the solid modifier thus obtained is light blue, and is applied on the character described with a pen, and when left to stand, the coated surface changes to white, and the character described below is As well as being invisible, I was able to write beautifully from above.

Example 2 A solid modifier of the present invention was prepared in the same manner as in Example 1 except that the components shown in Table 1 were used. The appearance of the solid modifier obtained in this way is light blue, and it is applied over the characters described with a pen, and when left standing, the coated surface turns white and the characters described below are visible. As I lost it, I was able to write beautifully from above. Example 3 Except having used the component of Table 1, it carried out similarly to Example 1, and prepared the solid modifier of this invention. The solid modifier thus obtained was as excellent as that obtained in Example 2. The compositions of the solid modifiers of Examples 1 to 3 are summarized in Table 1. The amounts of each component in the table are parts by weight.

[0014]

[Table 1] Table-1 Ingredients Example 1 Example 2 Example 3 Glycerin 4 4 4 Water 30 30 30 1,2-Benzoisothiazolin-3-one 0.03 0.03 0.03 Methylcellulose 1 1 0 Polyvinylpyrrolidone 1 2 3 Triethanolamine 1 0 0 Carboxythymolphthalein 0.005 0 0 Bromocarboxythymolphthalein 0 0.02 0.02 Calcium hydroxide 0.5 0 0 Sodium stearate 16 16 16 Sodium myristate 2 2 2 Titanium oxide 40 40 40 Iron tetroxide 0.02 0.02 0.02 Silica 4 1 3 Kaolin clay 1 1 1 Calcium carbonate 0 0 0.02 Total 100.555 97.07 99.09

Claims (2)

[Claims] Claims: 1. A solid-state modifier containing a chromogenic dye, a gel-forming substance and a white pigment having a carboxyl group in the molecule and developing green, blue, purple or red in the presence of water. Agent. 2. The solid modifier according to claim 1, wherein the color-forming dye is an alkylphenolphthalein PH indicator having a carboxyl group.