JP2002294103A - Aqueous correcting liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an aqueous correcting liquid which evolves no cissings when it is coated for correction on an image reproduced by a dry duplicator, and the like, and hence is excellent in coating properties. SOLUTION: The aqueous correcting liquid comprises at least an opacifying material, a resin, a polyether-modified dimethylsiloxane and water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an aqueous correction fluid. More specifically, the present invention relates to an aqueous correction liquid which is excellent in coating properties and does not cause repelling even when correction coating is performed on a copy image of a dry copying machine or the like.

[0002]

2. Description of the Related Art Conventionally, a correction liquid has been used to conceal and correct handwriting of a writing instrument, a printing mark of a typewriter, a copy image by a dry copying machine, and the like. In this correction fluid,
There are an oil-based correction liquid using an organic solvent as a solvent and an aqueous correction liquid using water. In recent years, there has been a growing demand in the market for aqueous correction liquids due to the problem of odor of organic solvents and the like.

[0003] The aqueous correction liquid is used for concealing and correcting handwriting of oil-based ink, printing marks of a typewriter or the like, and an image copied by a dry copying machine. Organic solvent and resin emulsion and / or
Or, those containing a water-soluble resin are known.

[0004] Containers for the correction fluid include a nail polish type bottle system having a coating shaft with a brush attached inside the cap of the container, and a pen type such as a brush type, a ball type and a core type. The raw ink system is widely used.

[0005]

When an image copied by a dry copying machine is applied by correction, repelling occurs. Repelling is a phenomenon that occurs because the surface of an image copied by a dry copying machine is hydrophobic, in that the applied correction liquid cannot form a film on the image and cannot conceal the image. In order to prevent the occurrence of repelling, increasing the ink viscosity and adding various wetting agents are being studied. However, if the ink viscosity is increased, the leveling of the coated surface is deteriorated, and foaming is caused by the added wetting agent. This causes secondary problems such as the occurrence of pores in the modified coating film, resulting in poor appearance, and a rise in viscosity, resulting in poor leveling of the coated surface.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an aqueous correction liquid which does not cause repelling on a coated surface when an image copied by a dry copying machine or the like is corrected and coated, that is, has excellent coatability.

[0007]

SUMMARY OF THE INVENTION The present invention provides an aqueous correction solution containing at least a concealing material, a resin, a polyether-modified dimethylsiloxane, and water.

Hereinafter, the present invention will be described. The concealing material is to impart concealing properties, and a white pigment having a high concealing property such as titanium oxide or zinc oxide can be used.
Titanium oxide is preferable because of its high concealing property. Titanium oxide is
Both rutile type and anatase type can be used. Examples of commercially available products include Tytone SR-1 and R-6.
50, R-3L, R-7E, R-5N, A-1
10, A-150 (manufactured by Sakai Chemical Industry Co., Ltd.), Taipaque R-580, R-560, R-930, A-100, A-220, CR-58 (above, Manufactured by Ishihara Sangyo Co., Ltd.), Kronos KR-310, KR-38
0, the same KR-480, the same KA-10, the same KA-20, the same KA-30 (all manufactured by Titanium Industry Co., Ltd.), the Thai Pure R-900, and the same R-931 (all manufactured by Dupont Japan Limited), Titanics JR-300 and JR-6
00A, JR-800, JR-801 (all manufactured by Teika Co., Ltd.), Bayer Titanium R-FD-1, and RF
B-3 and RD (both manufactured by Bayer AG, Germany). These titanium oxides can be used alone or as a mixture of two or more kinds, and the amount of use is preferably 30 to 70% by weight based on the total amount of the aqueous correction liquid.

The resin is used as a stabilizer for improving the fixability and strength of the coating film and as a dispersion stabilizer for a concealing material such as titanium oxide.
Resin emulsions and water-soluble resins are mentioned. As the resin emulsion, an acrylic resin emulsion is preferable from the viewpoint that the film after drying is strong and has flexibility, and specific examples thereof include JSR acrylic emulsions AE322, 517, 513A, and 815 (above, Japan Synthetic Rubber Co., Ltd.), Movinyl 727, 7
45, 705, 760, 860, and 863 (all manufactured by Hoechst Synthesis Co., Ltd.), Primal AC-22,
AC-61, AC-73, AC-3444, A
C-2235 (above, manufactured by Rohm and Haas Japan KK), Nicazol RX-380, and RX-28
4A, 533K, RX-74, RX-301C,
RX-413A and RX-638A (all manufactured by Nippon Carbide Industry Co., Ltd.) and the like. The amount used can be 5 to 15% by weight based on the total amount of the aqueous correction fluid,
Preferably, it is 7 to 10% by weight.

Examples of the water-soluble resin include natural resins such as gum arabic, gum tragacanth, guar gum, locust bean gum, alginic acid, carrageenan, gelatin, polypeptide, casein, xanthan gum, dextran, welan gum, ramzan gum, methylcellulose, and the like.
Semi-synthetic resins such as ethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, starch, sodium glycolate, sodium alginate, propylene glycol alginate, water-soluble polyester resins, water-soluble acrylic resins, polyvinyl alcohol, polyvinyl pyrrolidone And synthetic resins such as polyvinyl methyl ether, carboxy vinyl polymer, polyethylene oxide, vinyl acetate-vinyl pyrrolidone copolymer, and methyl vinyl ether-maleic anhydride copolymer. The used amount can be 5 to 15% by weight, preferably 7 to 10% by weight based on the total amount of the aqueous correction fluid. These resin emulsions and water-soluble resins can be used alone or in combination of two or more. The amount used is preferably 2 to 10% by weight based on the total amount of the aqueous correction liquid.

[0011] The polyether-modified dimethylsiloxane is
This is an important element of the present invention which has a function of suppressing repelling when a copy image copied by a dry copying machine or the like is corrected and applied. Moreover, it is excellent that secondary problems such as generation of bubbles and reduction in leveling do not occur when used. The polyether-modified dimethylsiloxane is obtained by bonding polyether and dimethylsiloxane. Polyether is a linear molecule containing an ether bond in the main chain,
Generally, it is a polymer compound composed of repeating [-MO-] units, and M is usually a methylene group or a polymethylene group and a derivative thereof. Examples include polymers of polyoxymethylene, polyethylene oxide, trimethylene oxide, and polymers of 1,3-dioxolane. As the polyether-modified dimethylpolysiloxane, BYK
301, BYK307, BYK331, BYK333,
BYK341, BYK345, BYK346, BYK3
48 (all manufactured by Big Chemie Japan Ltd.). The amount used is 0.2 to
1.0% by weight is preferred.

Incidentally, in addition to the above-mentioned components, various additives conventionally used can be used. For example, a coloring pigment may be used in combination to match the color tone with a writing surface such as paper, or an extender such as silica powder, aluminum silicate, or calcium carbonate may be used in combination to improve the hiding power. Further, glycols, glycol ethers, and polyhydric alcohols may be used in combination for freeze stability of the aqueous correction fluid. Furthermore, dispersing agents for the dispersion stability of the concealing agent, sedimentation prevention, thickeners for viscosity adjustment, alkali agents, plasticizers to adjust the hardness of the coating film, to improve the coating performance. A flow improver or a leveling agent can be appropriately added to the mixture.

The aqueous correction liquid of the present invention can be obtained by dispersing and mixing the above components using a disperser such as a Dyno mill, a ball mill, an attritor, a sand grinder, or the like.

[0014]

The aqueous correction liquid has a high surface tension because the main solvent is water, and therefore has a weak effect of wetting the character surface, and is hydrophobic like a copied image copied by a dry copying machine or the like. When applied to the surface, repelling occurs, but the aqueous correction solution containing the polyether-modified dimethylpolysiloxane of the present invention does not repel. This is as follows. Dimethylpolysiloxane is a substance that is originally lipophilic and has strong defoaming properties, and is immiscible with water. By modifying this dimethylpolysiloxane with a polyether, it becomes a substance having an appropriate lipophilicity and an appropriate defoaming property, the surface tension of the liquid is reduced, the liquid is easily wetted on the surface of the character, and when modified and applied, it is repelled. It is presumed that the bubbles disappear and the generation of bubbles is suppressed.

[0015]

【Example】

The above components were dispersed in a ball mill for 24 hours to obtain an aqueous correction liquid.

[0016] The above components were made in the same manner as in Example 1 to obtain an aqueous correction fluid.

[0017] The above components were made in the same manner as in Example 1 to obtain an aqueous correction fluid.

[0018] The above components were made in the same manner as in Example 1 to obtain an aqueous correction fluid.

Comparative Example 1 An aqueous correction liquid was obtained in the same manner as in Example 1 except that water was used in place of BYK346.

Comparative Example 2 In Example 3, BYK341 was deleted, and water was further added.
An aqueous correction liquid was obtained in the same manner as in Example 3 except that the amount was changed to 3.4 parts by weight.

Comparative Example 3 In Example 1, 0.1 part by weight of an air roll CT-1 (wetting agent, dioctyl sulfosuccinate, manufactured by Toho Chemical Industry Co., Ltd.) was used instead of BYK346 (0.4 part by weight).
An aqueous correction liquid was obtained in the same manner as in Example 1 except that 0.3 parts by weight of water was used.

Comparative Example 4 In Example 2, Olphin STG (a nonionic surfactant, Nissin Chemical Co., Ltd.) was used in place of BYK301.
A) An aqueous correction liquid was obtained in the same manner as in Example 2 except that a 1% by weight aqueous solution was used.

As described above, the aqueous correction solutions obtained in Examples 1 to 4 and Comparative Examples 1 to 4 were tested for coatability. Table 1 shows the results.

Coatability test: 100 hiragana characters (A) were copied on copy paper with a dry copying machine, and the aqueous correction fluid obtained in the above Examples and Comparative Examples was modified with a correction brush (Pentel Corporation).
Into a container with the product code ZL9)
Apply character correction. After drying, the number of characters with repelling was counted visually.

[0025]

[Table 1]

[0026]

As described in detail above, the aqueous correction liquid of the present invention is an aqueous correction liquid having excellent coatability which does not repel a copy image copied by a dry copying machine or the like.

Claims (1)

[Claims] 1. An aqueous correction liquid containing at least a concealing material, a resin, a polyether-modified dimethylsiloxane, and water.