JP2871008B2 - Correction fluid - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a correction liquid containing a concealing material, a solvent, and a binder as main components.

(Conventional technology) The correction liquid contains a concealing material, water or an organic solvent, and a binder such as a resin soluble in the used water or organic solvent as main components.

As the concealing material, a pigment having high concealing properties such as titanium oxide is used.

Solvents are used for handwriting of water-based inks such as fountain pens and water-based felt pens, using toluene, xylene, 1,1,1-trichloroethane, trichloroethylene, etc. as main solvents, oil-based ballpoint pens, handwriting with oil-based ink such as oil-based markers, Water was used as a main solvent for printing with a typewriter, a copy image with a dry copying machine, and the like. Furthermore, in recent years, cyclohexane-based solvents such as cyclohexane, methylcyclohexane, and ethylcyclohexane have been used to eliminate the complexity of using different solvents depending on the type of handwriting.

When a binder, such as toluene, xylene, 1,1,1-trichloroethane, trichloroethylene or cyclohexane-based solvent, is used, an acrylic resin, a vinyl alkyl ether resin, a cyclized rubber, a styrene-butadiene copolymer-based elastomer, or the like is used. When water is used as a main solvent, a (meth) acrylate-based resin emulsion,
Styrene-butadiene copolymer resin emulsions and ethylene vinyl acetate resin emulsions are used.

In order to improve the concealing property of the coating film of the correction liquid, it is necessary that the concealing material such as titanium oxide is well dispersed, but the concealing material dispersed in the liquid easily causes coaggregation, As a result, the concealing property may be reduced. Therefore, it is known to add spherical particles such as melamine-formaldehyde microspheres in order to prevent coagulation of the concealing material and obtain the concealing power of the concealing material (JP-A-1-170671).

(Problems to be Solved by the Invention) Since the correction liquid not only conceals and corrects characters and designs, but also often re-writes on the coating film, it is necessary to dry the coating film quickly. . The drying property of the coating film is affected by the material, such as the type of solvent used, and also by the film thickness. Therefore, it is necessary to have a high hiding power even with a thin coating film, but a satisfactory hiding power cannot be obtained only by preventing the co-aggregation of titanium oxide using the spherical particles.

An object of the present invention is to obtain a correction liquid having a high hiding power.

(Means for Solving the Problems) The present invention provides a correction liquid comprising at least a concealing material, a solvent, a binder, and hollow particles.

 The details will be described below.

As the concealing material, a pigment having high concealing properties such as titanium oxide or zinc oxide is used, and titanium oxide is particularly preferable. Various titanium oxides such as rutile type and anatase type can be used as the titanium oxide. Commercially available products include Tytone SR-1, R-650, R-3L, A-110, A-110
150, R-5N (hereinafter, manufactured by Sakai Chemical Industry Co., Ltd.), Taipaque R-580, R-550, R-930, A-100, A-
220, CR-58 (all manufactured by Ishihara Sangyo Co., Ltd.), Kronos K
R-310, KR-380, KR-480, KA-10, KA-20,
KA-30 (all made by Titanium Industry Co., Ltd.), Thai Pure R
-900 and R-931 (both manufactured by DuPont Japan Limited). The use amount thereof is preferably 20 to 50% by weight based on the total amount of the correction fluid.

The solvent is used for a binder solvent, clay adjustment, and the like. Specifically, toluene, xylene, n-heptane,
n-octane, cyclohexane, methylcyclohexane, cyclopentane, hydrocarbons such as methylcyclopentane, 1,1,1-trichloroethane, halogen hydrocarbons such as tetrachloroethylene, 1,4-dioxane, n-butyl ether, Ether solvents such as trioxane, ketone solvents such as ethyl methyl ketone and methyl-n-propyl ketone, and ester solvents such as propyl formate and ethyl acetate can be used alone or in combination, and the drying time of the coating film is considered. In this case, those having a boiling point of 40 ° C. to 150 ° C. are preferred, and the amount used is preferably 30 to 60% by weight based on the total amount of the correction fluid.
If a paraffinic hydrocarbon such as n-heptane or n-octane or a naphthenic hydrocarbon such as cyclohexane, methylcyclohexane, cyclopentane or methylcyclopentane is used, even if the handwriting is water-based, it is oily. Can also be used.

The binder is used to form a coating film, and specifically, an acrylic resin, an alkyd resin, a vinyl resin, a polyester resin, a vinyl alkyl ether resin,
There are cyclized rubber, styrene-butadiene elastomer and the like, and the use amount thereof is preferably 5 to 20% by weight based on the total amount of the correction liquid.

The hollow particles are used to prevent co-aggregation of the concealing material and to improve the concealing property of the coating film. Even if the hollow particles are single hollow particles having one hollow per particle, Even multi-hollow particles having a plurality of hollows per particle can be used. As a specific example, a glass microballoon IG101 made of borosilicate glass (average particle diameter 80 μm)
m, hollow diameter 77 μm), IG25 (average particle diameter 75 μm, hollow diameter 72 μm), R (average particle diameter 80 μm, hollow diameter 76 μm)
m), glass microballoon SI made of silica (average particle diameter 80 μm, hollow diameter 77 μm), glass microballoon FT102 made of insoluble glass (average particle diameter 80 μm, hollow diameter 77 μm), and FTD202 (average particle diameter 65 μm, hollow diameter) 6
God ball B-6C made of porous hollow silica (2.5 μm) (above, manufactured by Emerson & Cumming, USA)
(Average particle diameter 2.2 μm, hollow diameter 1.5 μm), A-11C
(Average particle diameter 3.5μm, hollow diameter 2.3μm), B-16C
(Average particle diameter 6.5 μm, hollow diameter 4.3 μm), B-25C
(Average particle diameter: 14 μm, hollow diameter: 9.3 μm) (hereinafter, manufactured by Suzuki Yushi Kogyo Co., Ltd.)
-84J (average particle diameter 0.55μm, hollow diameter 0.3μm), OP-
SX863 (A) composed of 62J (average particle diameter 0.4 μm, hollow diameter 0.2 μm) (above, manufactured by Rohm and Haas Company, USA) and hollow latex (average particle diameter 0.37 μm, hollow diameter 0.25 μm)
m), SX864 (A) (average particle diameter 0.4 μm, hollow diameter 0.25 μm)
m), SX865 (A) (average particle diameter 0.43 μm, hollow diameter 0.25)
μm) (hereinafter Nippon Synthetic Rubber Co., Ltd.) Grandoll series made of hollow polymer (Dai Nippon Ink Co., Ltd.)
And the like, and these can be used alone or as a mixture. The particle size is 0.3 to prevent coagulation of the concealing agent.
μm or more, preferably 100 μm in consideration of the smoothness of the coating film.
m or less is preferable. Further, when the hollow diameter is equal to or more than half a wavelength of visible light, the particles also function as a white pigment, and thus the hollow diameter is preferably 0.2 μm or more. The amount used is preferably from 0.1 to 30% by weight, more preferably from 1.0 to 20% by weight, based on the total amount of the correction fluid. When the hollow polymer or hollow latex is a water-dispersed system, it contains water in the hollow. Therefore, when the hollow polymer or hollow latex is used in an organic solvent system, it is necessary to replace the organic solvent with water.

In addition to the above components, a conventionally known coloring pigment may be used in combination, or a dispersant or an anti-settling agent for the dispersion stability of the pigment, a thickener for adjusting the clay, a coating agent for the coating film. A plasticizer can be appropriately added to adjust the hardness, and a flow improver or a leveling agent can be appropriately added to improve the coating performance.

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

(Operation) The hollow particles contained in the correction fluid according to the present invention have the effect of a spacer that suppresses coaggregation of the primary particles of the concealing material used, so that the original concealing power of the concealing material can be obtained, Since the air contained in the particles lowers the average refractive index of the binder, the hiding power of the coating film increases. It is inferred.

Incidentally, the hiding power (HP) of the coating film is obtained from the following formula (I),
The reflectance (F) in the following equation (I) is obtained from the Fresnel equation (II). Therefore, the lower the average refractive index of the binder, the higher the hiding power.

F: reflectance, PVC: pigment volume concentration, n _1: an average refractive index of the concealed material, n _2: Further average refractive index of the binder, if the hollow diameter with half-wave or more hollow particles of visible light, hollow Hollow particles also function as white pigments due to the visible light reflection by the particles and the difference in the refractive index between the outer wall of the particles and air, so that the hiding power is improved.

(Embodiment) Hereinafter, simply “parts” indicates “parts by weight”.

Example 1 Chronos KR-380 65 parts Acryloid B-66 12 parts (Acrylic resin manufactured by Rohm & Haas Company, USA) 1,1,1-Trichloroethane 120 parts Mizukasil P-801 2 parts (Mizusawa Chemical Industry Co., Ltd. ), Fine silica) Glass microballoon IG101 18 parts Homogenol L-18 1.2 parts (Kao Corporation, dispersant) The above components were dispersed in a ball mill for 24 hours to obtain a correction liquid.

Example 2 Kronos KR-380 60 parts Acryloid B-67 13 parts (Acrylic resin manufactured by Rohm & Haas Co., USA) Methylclohexane 80 parts Gondoball B-6C 15 parts Mizukasil P-80 2 parts MA-100 0.05 part (Mitsubishi 1 part of homogenol L-18 (manufactured by Kasei Kogyo KK) 1 part of the above-mentioned components were prepared in the same manner as in Example 1 to obtain a correction liquid.

Example 3 Kronos KR-380 70 parts Acryloid B-66 10 parts Xylene 80 parts SX863 (A) 1 part Dioctyl adipate 3 parts (Plasticizer manufactured by Daihachi Chemical Industry Co., Ltd.) MA-100 0.05 part Homogenol L- 18 1.5 parts The above components were prepared in the same manner as in Example 1 to obtain a correction fluid.

Comparative Example 1 A correction liquid was obtained in the same manner as in Example 1 except that the glass microballoon IG101 in Example 1 was omitted.

Comparative Example 2 Except for the glass microballoon IG101 in Example 1, except that 18 parts of eposter S (melamine-formaldehyde microspheres manufactured by Nippon Shokubai Kagaku Kogyo Co., Ltd.) was added, the correction liquid was prepared in the same manner as in Example 1. Obtained.

(Effects of the Invention) The concealment ratio test was performed on the correction liquids obtained in Examples 1 to 3 and Comparative Examples 1 and 2.

 Table 1 shows the results.

-Concealment ratio test: Correction liquid is applied to concealment ratio measurement paper (JISK5400)
After applying with a 2 mil applicator and drying,
The {, 0} diffuse reflectance was calculated.

As described above in detail, the correction liquid according to the present invention has a high hiding power and is excellent.

Claims (1)

(57) [Claims] 1. A correction liquid comprising at least a concealing material, a solvent, a binder, and hollow particles.