JPH09302287A - Liquid eraser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a liquid eraser satisfactory in performances such as power of hiding a coating film to be erased, driability, leveling properties, the easiness of re-writing, etc., by using a specified copolymer. SOLUTION: This eraser mainly consists of a white pigment, an organic solvent and a vinyltoluene/acrylic ester copolymer resin. The vinyltoluene/acrylic ester copolymer resin used should be one soluble in the organic solvent. It is used in an amount of desirably 5-15wt.%. The organic solvents used are particularly desirably aliphatic hydrocarbon solvents such as n-hexane, n-octane and isooctane and naphthenic solvents such as cyclohexane, methylcyclohexane and ethylcyclohexane.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a correction liquid for concealing stains on characters and paper, and more particularly to a correction liquid excellent in correcting PPC copy originals.

[0002]

2. Description of the Related Art Generally, a correction fluid is a white pigment, a binder resin,
And a solvent as a main component. Aqueous type using water as the solvent (Japanese Patent Publication No. 52-44246), oil type using toluene, xylene, or chlorine type solvent (Japanese Patent Publication No. 61-36552), aqueous oil type using a solvent such as paraffin type or naphthene type. Shared type (Tokuhei 1-5930
The correction fluid of 8) is known, but of these, the water-based oil-based common type is currently the mainstream. The water-based oil type common correction liquid has an advantage that it can correct water-based and oil-based writing lines regardless of the type of ink.

However, when correcting PPC copy originals which are frequently used recently, there is a drawback in that the styrene resin contained in the toner as a fixing agent is dissolved to darken the correction coating film. In order to improve this drawback, a correction liquid (Japanese Patent Publication No. 1-59308) obtained by dispersing an opacifying agent while polymerizing an acrylic resin monomer in a mixed solvent of a naphthene hydrocarbon and a chlorine organic solvent, or in a toner By co-polymerizing 30% by weight or more of (meth) acrylic acid ester with acrylic resin and a solvent containing 65% or more of paraffinic hydrocarbon which is not soluble in the contained styrene resin, this solvent can be easily used. A correction solution using a resin that dissolves in water and takes dispersion stability into consideration (Japanese Patent Laid-Open No. 6544/1993).
0) etc. are known.

However, although the blackening at the time of the correction concealment has disappeared, cracks may occur in the correction coating film, and unevenness due to the cracks may hinder rewriting.

[0005]

DISCLOSURE OF THE INVENTION The present invention provides a correction solution which has sufficient performance in hiding, drying, leveling, rewriting, etc. of a correction coating film and which can well conceal copy characters of a PPC copy. Is provided.

[0006]

The present invention comprises, as main components, at least a white pigment, an organic solvent, and a vinyltoluene-acrylic acid ester copolymer resin obtained by radically polymerizing an acrylic acid ester and vinyltoluene. It is characterized in that a correction liquid is used which makes the vinyltoluene-acrylic acid ester copolymer resin soluble in the organic solvent.

The vinyltoluene-acrylic acid ester copolymer resin used in the present invention is not only used as a binder for a correction fluid coating film, but also because it has an amphiphilic resin composition, it is adsorbed on the white pigment and used as a dispersion resin. Have performance. The amount used is 5 to 15% by weight, preferably 7 to 12
% By weight. If it is less than 5% by weight, poor dispersion of the pigment may occur, cracks may occur in the correction coating film, or the coating film may peel during rewriting. On the other hand, when the content is 15% by weight or more, the viscosity of the correction fluid becomes high and a smooth coating film cannot be obtained, the coating film becomes tacky, and the rewriting property is poor.

Specific examples of the organic solvent that can be used as the organic solvent include aromatic hydrocarbon solvents such as toluene and xylene, aliphatic hydrocarbon solvents such as n-hexane, n-octane and isooctane, and cyclohexane. Examples include naphthene-based solvents such as methylcyclohexane and ethylcyclohexane, ketone-based solvents such as methyl ethyl ketone and methyl isopropyl ketone, ester-based solvents such as ethyl acetate and butyl acetate. Achieves the good dryness of the modified coating, the common oil-based type that can be used for both water-based and oil-based inks, and the purpose of not causing darkening of the modified coating of PPC copy, and to the user In order to impart excellent safety, among the above organic solvents, n-
Aliphatic hydrocarbon solvents such as hexane, n-octane and isooctane and / or naphthene solvents such as cyclohexane, methylcyclohexane and ethylcyclohexane are particularly desirable.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The vinyltoluene-acrylic acid ester copolymer resin used in the composition of the present invention is adsorbed on a white pigment and greatly improves the dispersibility of the pigment. As a result, the aggregation of the pigment is less likely to occur, and the sedimentation and separation of the pigment is less likely to occur even after storage for a long period of time, and excellent effects such as maintaining good quality are excellent. In addition, the modified coating film has good hiding power, dryness, and rewriting ability, as well as PPC.
This has the effect of preventing blackening when correcting a copy document.

[0010]

EXAMPLES The present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to these.

The formulations of Examples and Comparative Examples were stirred for one day using a ball mill to obtain a correction solution.

[0012]

[Table 1]

[0013]

[Table 2]

The correction liquid was used to conceal the correction of the PPC copy original, and the presence or absence of cracks was visually judged. In addition, rewriting was performed with an oil-based ballpoint pen and a water-based ballpoint pen, and good marks were marked with ◯, slightly bad marks were marked with Δ, and bad marks were marked with x.

[0015]

[Table 3]

Industrial Applicability According to the present invention, there is provided a correction liquid which has sufficient performance in hiding property, drying property, leveling property, rewriting property, etc. of a correction coating film and which can well conceal copy characters of PPC copy. .

Claims (3)

[Claims] 1. A correction liquid containing at least a white pigment, an organic solvent, and a vinyltoluene-acrylic acid ester copolymer resin as main components. 2. The correction liquid according to claim 1, wherein the vinyltoluene-acrylic acid ester copolymer resin is soluble in the organic solvent according to claim 1. 3. The correction solution according to claim 1, wherein the organic solvent is an aliphatic hydrocarbon solvent such as n-hexane, n-octane or isooctane and a naphthene solvent such as cyclohexane, methylcyclohexane or ethylcyclohexane.