JPH10130548A - Highly masking liquid composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition, excellent in drying properties and smoothness of a coating film and usable as a white liquid for correction, etc., by including a masking material, isohexane and a cyclohexane-based solvent and a binder soluble in the solvent therein. SOLUTION: This composition comprises at least (A) a masking material (especially preferably titanium oxide), (B) isohexane and a cyclohexane-based solvent and (C) a binder soluble in the component B (especially preferably an acrylic resin). The amounts of the respective components used based on the total amount of the composition are preferably 20-50wt.% component A, 30-70wt.% component B and 5-20wt.% component C. The amount of the isohexane is preferably 50-80wt.% based on the total amount of the solvent for the component B. Thereby, the composition of practically excellent quality as a white liquid for correction or a part for undercoating is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a highly concealable liquid composition for forming a highly concealed coating film such as a correction liquid or a primer paint, and more particularly, to a coating film drying property and a smoothness. The present invention relates to a highly concealable liquid composition having excellent properties.

[0002]

2. Description of the Related Art Highly concealable compositions are used for concealing and correcting characters and designs such as correction fluids and undercoat paints.

As a conventional technique, a correction fluid will be described as an example. 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, fountain pens, for handwriting of water-based ink such as water-based felt-tip pens, using toluene, xylene, 1,1,1-trichloroethane, trichloroethylene, etc. as the main solvent, oil-based ballpoint pens, handwriting with oil-based ink such as an oil-based marker, Water is used as a main solvent for printing with a typewriter and a copying machine with a dry copying machine. 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 using a binder such as toluene, xylene, 1,1,1-trichloroethane, trichloroethylene or a cyclohexane-based solvent, 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 the main solvent,
(Meth) acrylate resin emulsion, styrene-butadiene copolymer resin emulsion, and ethylene vinyl acetate resin emulsion are used.

[0004]

SUMMARY OF THE INVENTION Dryness and smoothness of a coating film. In other words, the highly concealable liquid composition according to the present invention, when used, not only performs concealment and correction of characters and designs, but often performs rewriting on the coating film, and often has the drying property of the coating film. It is necessary to have excellent smoothness. However, the conventionally used cyclohexane solvents cannot be said to be sufficiently fast-drying, and the smoothness is also insufficient.

[0005]

The present invention provides a highly concealable liquid composition containing at least a concealing material, isohexane, a cyclohexane-based solvent, and a binder soluble in the mixed solvent. is there.

Hereinafter, the composition of the present invention will be described. As the concealing material, a pigment having a high concealing property such as titanium oxide or zinc oxide is used, and titanium oxide is particularly preferable. As the titanium oxide, rutile type, anatase type or the like titanium oxide can be used.
R-650, R-3L, A-110, A-15
0, R-5N (all manufactured by Sakai Chemical Industry Co., Ltd.), TYPAKE R-580, R-550, R-930, A-
100, A-220, CR-58 (all manufactured by Ishihara Sangyo Co., Ltd.), Kronos KR-310, KR-380,
KR-480, KA-10, KA-20, KA
-30 (manufactured by Titanium Industry Co., Ltd.), Thai Pure R-
900 and R-931 (all manufactured by TUPON Japan Limited). The use amount thereof is preferably 20 to 50% by weight based on the total amount of the liquid composition having high concealability.

[0007] Isohexane and cyclohexane-based solvents are solvents for highly concealable liquid compositions, and are used to improve the drying property and smoothness of coating films of the highly concealable liquid compositions. Isohexane is a paraffinic solvent having one methyl group in the side chain. Examples of the cyclohexane-based solvent include cyclohexane, methylcyclohexane, and ethylcyclohexane. The ratio of the solvent can be selected depending on the purpose. When the amount of isohexane is large, the drying property and smoothness of the coating film are improved. However, considering stability over time, it is appropriate that isohexane is 50 to 80% by weight based on the total solvent. Further, the use amount thereof is preferably 30 to 70% by weight.

[0008] The binder is used to form a coating film and must be soluble in the above-mentioned mixed solvent of isohexane and cyclohexane. In particular,
Examples of the acrylic resin include an acrylic acid ester polymer, a methacrylic acid ester polymer, a copolymer of acrylic acid and a methacrylic acid ester, a vinyl alkyl ether resin, a cyclized rubber, and a styrene-butadiene elastomer resin. Especially when acrylic resin is used,
The adhesion of the coating film to the surface to be coated is good, and the smoothness of the coating film is also good. Commercially available acrylic resins include Acryloid B-66 and Acryloid B-67 (US,
Roth & Haas). The binder is preferably used in an amount of 5 to 20% by weight based on the total amount of the liquid composition having high concealing properties.

[0009] In addition to the above components, extenders such as silica and calcium carbonate may be used in combination to improve the hiding power. When various organic solvents such as toluene, xylene, 1,1,1-trichloroethane, trichloroethylene, normal hexane, and normal heptane are added for various purposes, the appropriate amount is 5 to 15% by weight of the total amount of the solvent. In addition, color pigments to match the color of the writing surface, dispersants and anti-settling agents for the dispersion stability of the pigments, plasticizers to adjust the hardness of the coating film, better coating performance For this purpose, various additives such as a flow improver and a leveling agent can be appropriately added.

[0010]

In a highly concealable liquid composition, a method of using a solvent having a high evaporation rate is effective as a method for improving the drying property of a coating film. As a method of improving the smoothness of the coating film, a method of lowering the viscosity of the highly concealable liquid composition is effective. In addition, when the viscosity decreases, it is easy to apply thinly on the paper surface, so that there is an effect of indirectly improving the drying property. Therefore, in order to improve both dryness and smoothness of the coating film,
A method of lowering the viscosity of the highly concealable liquid composition by using a solvent having a high evaporation rate can be adopted. By the way, as a method of lowering the viscosity, a method of changing the blending amount to lower the viscosity,
There is a method of lowering the viscosity of the compound material itself, but the former is
Since it is necessary to reduce the concealing material and increase the amount of the solvent, there is a problem that the concealing property is reduced. Isohexane has a boiling point of 60 ° C
Therefore, normal hexane (boiling point 68.7 ° C.), cyclohexane (boiling point 8
0.7 ° C), methylcyclohexane (boiling point 100.9
C), the coating film drying property is significantly improved. The viscosity is 0.3 mPa · s, which is lower than that of cyclohexane (viscosity 0.88 mPa · s) and methylcyclohexane (viscosity 0.69 mPa · s) which have been used for the correction fluid. The viscosity decreases and the smoothness improves. However, isohexane has a problem of low solubility in resins. If the solubility is not sufficient, the resin solution and the concealing material become complicated, and if left undisturbed, a hard precipitate will be formed at the bottom of the container of the composition of the present invention.
Then, it becomes impossible to disperse to the original state at the time of use even with stirring. Therefore, it is necessary to use a cyclohexane-based solvent in combination. Since cyclohexane solvents have higher solubility in resins than isohexane, hard precipitates are less likely to be formed even when left to stand.

[0011]

EXAMPLES Examples of the present invention will be described below using a correction fluid, but the present invention is not limited to the examples.

Example 1 Khronos KR-380 (manufactured by Titanium Co., Ltd., rutile type titanium) 65 parts by weight Isohexane (manufactured by Maruzen Petrochemical Co., Ltd.) 32 parts by weight Methylcyclohexane (manufactured by Philips Sekiyu KK) 32 parts by weight Part: Acryloid B-66 (manufactured by Loin & Haas Company, USA, acrylic resin) 12 parts by weight Mizukasil P-80 (manufactured by Mizusawa Chemical Industry Co., Ltd., dispersant) 12 parts by weight Homogenol L-18 (Kao Corporation, dispersion) 1.2 parts by weight The above components were dispersed in a ball mill for 24 hours to obtain a correction liquid.

Example 2 Khronos KR-380 (described above) 70 parts by weight Isohexane 59 parts by weight Cyclohexane 15 parts by weight Acryloid B-67 (acrylic resin, manufactured by Rohm & Haas Company, USA) 13 parts by weight Mizukasil P-80 (described above) 9 parts by weight MA-100 (manufactured by Mitsubishi Kasei Kogyo Co., Ltd., carbon black) 0.05 parts by weight Homogenol L-18 (described above) 1 part by weight The above components were made in the same manner as in Example 1 to obtain a correction liquid.

Example 3 Kronos KR-380 (described above) 72 parts by weight Isohexane 63 parts by weight Methylcyclohexane 16 parts by weight Acryloid B-66 10 parts by weight Dioctyl adipate (Plasticizer, manufactured by Daihachi Chemical Industry Co., Ltd.) 3 parts by weight Part MA-100 (described above) 0.04 part by weight Homogenol L-18 (described above) 1.1 part by weight The above components were made in the same manner as in Example 1 to obtain a correction liquid.

Example 4 Khronos KR-380 (described above) 63 parts by weight Isohexane 28 parts by weight Methylcyclohexane 28 parts by weight 1,1,1-trichloroethane 6 parts by weight Carifrex TR1101 (styrene butadiene copolymer elastomer, shell chemistry 11 parts by weight Mizukasil P-80 (described above) 12 parts by weight Homogenol L-18 (described above) 1.2 parts by weight The above components were prepared in the same manner as in the examples to obtain a correction liquid.

Comparative Example 1 A correction liquid was obtained in the same manner as in Example 1, except that isohexane in Example 1 was changed to methylcyclohexane.

Comparative Example 2 A correction liquid was obtained in the same manner as in Example 1 except that cyclohexane in Example 1 was changed to isohexane.

Comparative Example 3 A correction liquid was obtained in the same manner as in Example 1, except that isohexane in Example 1 was changed to 1,1,1-trichloroethane.

As described above, the correction liquids obtained in Examples 1 to 4 and Comparative Examples 1 to 3 were tested for hiding ratio, viscosity, coating film drying property, and coating film smoothness. Table 1 shows the results.

[0020]

[Table 1]

* 1 Hiding ratio: The above correction liquid was applied to a hiding ratio measurement paper (JIS K5400) using a 2 mil applicator, and after drying, the 45 ° and 0 ° diffuse reflectance was measured and calculated. * 2 Viscosity: No. using a B-type viscometer. The measurement was performed with one rotor at a rotation speed of 30 rpm (25 ° C.). * 3 Coating film drying property: The above-mentioned correction liquid was applied using a 2 mil applicator, and the drying time was measured. * 4 Coating smoothness: Apply the above correction liquid to a commercially available tip valve type correction liquid application container (Pentel Correction Liquid ZL1-WK, Pentel Co., Ltd.)
Manufactured by Co., Ltd.), applied to high-quality paper, and visually observed for the surface condition. ◎: Extremely smooth ○: Smooth △: Slightly rough * 5 Stability over time: 50 parts of the above correction liquid in a bottle having a diameter of 16 mm
It was placed at 80 ° C. and left at 80 ° C., and after one month, the formation of a hard precipitate was examined with a glass rod. ：: not generated ○: generated less than 1 mm △: generated more than 1 mm

[0022]

As described in detail above, the highly concealable liquid composition of the present invention has a sufficient concealing property, is excellent in coating film drying property and coating film smoothness, Since there is no problem in stability, it has practically excellent quality as a correction liquid and a paint for undercoating.

Claims (1)

[Claims] 1. A highly concealable liquid composition comprising at least a concealing material, isohexane, a cyclohexane-based solvent, and a binder soluble in the mixed solvent.