JPH0463875A - Liquid eraser - Google Patents

Abstract

PURPOSE:To obtain a liquid eraser with improved erasing power by incorporating an opacifying agent, a solvent, a binder and hollow particles. CONSTITUTION:20-50wt% opacifying agent (preferably titanium oxide); 30-60wt% solvent with a boiling point of 40-150 deg.C; 5 to 20wt% binder; 0.1 to 30wt% hollow particles with particle sizes of 0.3 to 10mum and bore sizes of 0.2mum or more; and optionally a dispersant, an anti-setting agent, a thickener, a plasticizer, a flow improver, and a leveling agent are dispersed and mixed together.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a correction fluid whose main components are a concealing material, a solvent, and a binder.

(Prior Art) A correction fluid mainly includes a concealing material, water or an organic solvent, and a binder such as a resin that dissolves in the water or organic solvent used.

As the hiding material, a pigment exhibiting high hiding power such as titanium oxide is used.

For handwriting with water-based ink such as fountain pens and water-based felt-tip pens, toluene, xylene, 1,1,1-trichloroethane, trichloroethylene, etc. are used as the main solvent.
Water has been used as the main solvent for handwriting with oil-based inks such as oil-based ballpoint pens and oil-based markers, printing with typewriters, and images copied using dry copying machines. 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 toluene, xylene, 1,1.1-)-cycloethane, trichlorethylene, or cyclohexane-based solvents as the binder, acrylic resin, vinyl alkyl ether resin, cyclized rubber, or styrene-butadiene copolymer system can be used. When elastomers etc. are used and water is used as the main solvent, (meth)acrylic acid ester resin emulsions, styrene-butadiene copolymer resin emulsions,
An ethylene vinyl acetate resin emulsion is used.

In order to improve the hiding properties of the coating film of correction fluid, it is necessary that a hiding material such as titanium oxide is well dispersed, but hiding materials dispersed in the solution tend to coagulate. As a result, concealment performance sometimes deteriorated. Therefore, it is known to add spherical particles such as melamine-formaldehyde microspheres (Japanese Patent Laid-Open No. 1-170671) in order to prevent co-aggregation of the hiding material and obtain the original hiding power of the hiding material.

(Problem to be solved by the invention) Correction fluid not only conceals and corrects characters and designs, but also often rewrites on the paint film.

It is necessary that the coating film dries quickly. The drying properties of a coating film are affected not only by the type of solvent used and other materials, but also by the film thickness. Therefore, it is necessary that even a thin coating film has high hiding power, but a satisfactory hiding power cannot be obtained simply by preventing co-aggregation of titanium oxide using the above-mentioned spherical particles.

The object of the present invention is to obtain a correction fluid with high hiding power.

(Means for Solving the Problems) The gist of the present invention is a correction fluid comprising at least a concealing material, a solvent, a binding material, and hollow particles.

This will be explained in detail below.

As the concealing material, a highly concealing tumor material such as titanium oxide or zinc oxide is used, and titanium oxide is particularly good. As the titanium oxide, various types of titanium oxide such as rutile type and anatase type can be used. Commercially available products include Taitone 5R-1, Taitone R-650, Taitone R-3L, and Taitone A-110.
, same A-150. Same R-5N (manufactured by Sakai Chemical Industry'@), Thai Bake R-580, same R-550, same R-93
0, A-100゜ A-220, CR-58 (Ishiya Sangyo II), Kronos KR-310, KR-
380, KR~480, KA-10, KA-20
, KA-30 (manufactured by Titanium Industries Ltd.), Taipur R-900, and R-931 (manufactured by DuPont Japan Limited). The amount used is preferably 20 to 50% by weight based on the total amount of correction fluid.

The solvent is used to dissolve the binder, adjust the viscosity, etc. Specifically, toluene, xylene, n-hebutane,
-octane, cyclohexane, methylcyclohexane,
Hydrocarbons such as cyclopentane and methylcyclopentane; halogen hydrocarbons such as 1,1.1-trichloroethane and tetrachlorethylene.

1. Ethers such as 4-dioxane, n-butyl ether, trioxane, ethyl methyl ketone, methyl-n-
Ketone solvents such as propyl ketone, ester solvents such as propyl formate, and ethyl acetate can be used alone or in combination, and the boiling point is 40°C or more, considering the drying time of the coating film.
The temperature is preferably 150°C, and the amount used is preferably 30 to 60% by weight based on the total amount of correction fluid. Furthermore, if you use paraffinic hydrocarbons such as n-hebutane and n-octane, and naphthenic hydrocarbons such as cyclohexane, methylcyclohexane, cyclopentane, and methylcyclopentane, even if the handwriting is water-based, it will be oil-based. It can be used even if there is.

Binding materials are used to form paint films.

Specifically, acrylic resin, alkyd resin, vinyl resin, polyester resin, vinyl alkyl ether resin,
Examples include cyclized rubber and styrene-butadiene elastomer, and the amount used is preferably 5 to 20% by weight based on the total amount of the correction fluid.

The hollow particles also prevent co-aggregation of the masking material.

It is used to improve the hiding properties of the paint film.

It is possible to use single-hollow particles with one hollow hole per particle or multi-hollow particles with a plurality of hollow holes per particle. Specific examples include glass microballoons made of borosilicate glass GIOI (average particle size 80 μm, hollow diameter 77 μm), IG25 (
average particle diameter 75 μm, hollow diameter 72 p m), same R (
Glass micro balloon S made of silica (average particle size 8μm), hollow diameter 76μm) (average particle size 8oμm)
m, hollow diameter 77 μm), glass microballoon FT102 made of insoluble glass (average particle size 80 tt
m, hollow diameter 77 μm) - FTD202 (average particle diameter 65 μm, hollow diameter 62.5 μm) (manufactured by Emerson & Cuming, USA), Gotto Ball B-6C made of porous hollow silica (average particle diameter 2. 2 μm, hollow diameter 1.5 μm), A-11C (average particle size 3.5 μm)
, hollow diameter 2.3 μm), B-16C (average particle size 6.
5 μm, hollow diameter 4.3 μm), B-25C (average particle size 14 μm, hollow diameter 9.3 μm) (manufactured by Suzuki Yushi Kogyo ■), and low-peke ○P-84J made of hollow polymer.
(average particle size 0.55 μm, hollow diameter 0.3 μm), same 0
P-62J (average particle size 0.4 μm, hollow diameter 0°2μ
m) (manufactured by Rohm & Haas, USA), 5X863 (A) made of hollow latex (average particle size 0)
．． 37μm, hollow diameter 0.25pm), 5X864 (A
) (average particle diameter 0.4 μm, hollow diameter 0°25 μm), S
X, 865 (A) (average particle size 0.43 μm, hollow diameter 0.25 μm) (manufactured by Nippon Synthetic Rubber ■), and the Grandoll series (manufactured by Dainippon Ink ■) made of hollow polymers.

They can be used alone or in combination. The particle size is preferably 0.3 μm or more in order to prevent co-aggregation of the concealing agent, and preferably 1100 AL or less in consideration of the smoothness of the coating film. Furthermore, if the hollow diameter is equal to or larger than a half wave of visible light, the particle also functions as a white pigment, so the hollow diameter is 0.
The thickness is preferably 2 μm or more. The amount used is 0 for the total amount of correction fluid.
．． 1 to 30% by weight is preferable, more preferably 1.0 to 30% by weight.
It is 20% by weight. When a hollow polymer or a hollow latex is an aqueous dispersion system, it contains water in the hollow space, so when it is used in an organic solvent system, it is necessary to replace the water with the organic solvent.

In addition to the above-mentioned components, conventionally known coloring pigments may be used in combination, dispersants and anti-settling agents may be used to stabilize the dispersion of pigments, thickeners may be used to adjust viscosity, and additives may be used to harden the coating film. A plasticizer can be appropriately added to adjust the coating properties, and a flow improver or a leveling agent can be appropriately added to improve the coating performance.

The correction fluid of the present invention can be obtained by dispersing and mixing the above-mentioned components using a stirring disperser such as a ball mill, attritor, or sand grinder.(Function) The hollow particles contained in the correction fluid of the present invention are The masking material used has the effect of a spacer to suppress the co-aggregation of secondary particles, so the original hiding power of the masking material is obtained, and the air contained in each particle lowers the average refractive index of the binder. By lowering it, the hiding power of the coating film increases.

It is presumed that.

In addition, the hiding power (HP) of the coating film is obtained from the following formula (1),
The following formula (reflectance (F) in the middle is FreSne1 formula (If)
More demanded. Therefore, the lower the average refractive index of the binder, the higher the hiding power.

Average refractive index of n-opaque material.

n2: Average refractive index of the binder Furthermore, when using hollow particles with a hollow diameter of half a wave of visible light or more, the hollow particles also functions as a white pigment, improving hiding power.

(Example) Hereinafter, the term "parts" simply means "parts by weight."

From Lost Seeds Ronos KR-38065 parts Acryloid B-6612 parts (manufactured by Rohm & Haas, USA, acrylic resin) 1.1.
1-Trichloroethane 120 parts Mizukashiru p-
8012 parts (manufactured by Mizusawa Chemical Industry ■, fine silica) Glass microballoon IGIO 118 parts Homogenol L-181, 2 parts (manufactured by Kao ■, dispersant) The above components were dispersed in a ball mill for 24 hours to obtain a correction liquid. .

Scronos KR-38060 parts Acryloid B-6713 parts (acrylic resin, manufactured by Rohm & Haas, USA) Methylcyclohexane 80 parts Gottball B-
6C15 parts Mizukashiru P-8'0 2 parts M
A-1000.05 parts (manufactured by Mitsubishi Chemical Corporation, carbon black) Homogenol L-181 parts A correction solution was obtained using the above ingredients in the same manner as in Example 1.

Sei 11''y Cronos KR-38070 parts Acryloid B-6610 parts Xylene 80 parts 5X8
63 (A) 1 part Dioctyl adipate 73 parts (manufactured by Otona Kagaku Kogyo Co., Ltd., plasticizer) 05 parts of MA-1000 1.5 parts of homogenol L-18 A correction solution was obtained using the above components in the same manner as in Example 1. Ta.

Comparative Example 1 A correction fluid was obtained in the same manner as in Example 1 except that the glass microballoon IGI01 in Example 1 was removed.

A correction fluid was obtained in the same manner as in Example 1, except that the glass microballoon IGI01 in Main Example 1 was removed and 18 parts of Eposter S (melamine-formamide microspheres manufactured by Nippon Shokubai Chemical Co., Ltd.) were added. .

(Effect of the invention) A hiding rate test was conducted on the correction fluids obtained in Examples 1 to 3 and Comparative Examples 1 to 2.

The results are shown in Table 1.

Table 1 Apply to SK5400) with a 2 mil applicator.

After drying, 45° and 0° diffuse reflectances were calculated.

As explained above in detail, the correction fluid according to the present invention is
It has high hiding power and is good.

Claims (1)

[Claims] A correction fluid comprising at least a masking material, a solvent, a binder, and hollow particles.