JPS63175082A - Copied typeface erasing liquid - Google Patents

Abstract

PURPOSE:To obtain the titled erasing liquid for erasing needless parts among copied letters and figures, etc., capable of easily removing the resultant filmy product using e.g. an eraser, by dissolving a specific film-forming resin in a solvent soluble for bonding agent to disperse said resin in the form of fine particles. CONSTITUTION:A film-forming resin (A) compatible with both copying powder and bonding agent and (B) neither infiltrative into nor firmly bonding chemically or physically to copying paper (e.g., polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, acrylic resin, etc.) is dissolved or dispersed in the form of fine particles (pref. with a size <=0.09mu) in (C) a solvent soluble for said bonding agent (e.g., acetone, trichloroethane), thus obtaining the objective liquid for erasing needless parts among copied typefaces formed by melt bonding of bonding agent-contg. toner.

Description

DETAILED DESCRIPTION OF THE INVENTION Conventionally, when erasing unnecessary parts of characters, figures, and/or symbols (hereinafter referred to as a copy) of a copy that has been photocopied and fixed, a solvent that dissolves the fixing agent, such as acetone, trichloroethane, or any of these is used. M41; J It was common practice to rub the fixative onto the area to be erased with a brush or felt to dissolve the fixative, or to scrape off the area to be erased with a sharp knife. However, when erasing with a solvent, the fixing agent and copying powder dissolved in the solvent are either spread onto the paper surface together with the solvent, or only a part of it is attached to the felt or brush. , after the solvent evaporates, a small portion of these will remain in a further diffused state on the paper surface.In the end, this diffused residue will be re-fixed on the paper surface.This re-fixed product cannot be removed sufficiently with an eraser or the like.

Furthermore, if the portion to be erased is scraped off with a sharp knife, the copy paper may be damaged and sufficient erasure cannot be achieved.

The object of the present invention is to provide an obliteration fluid as described above which overcomes these drawbacks of the prior art.

The inventor of the present invention has solved this problem by: - being able to disperse and contain the fine powder for copying and the fixing agent, and preventing the toner from penetrating or chemically or physically bonding firmly to the copying paper to which it is fused; It has been found that the film-forming resin can be eliminated by a copying material erasing solution that is dissolved or dispersed in the form of fine particles (particle size of 0.09 μm or less) in a solvent that dissolves the fixing agent.

That is, an object of the present invention is an erasing liquid for erasing unnecessary parts of a copy obtained by fusing and fixing a toner containing a fixing agent, which is capable of dispersing and containing fine copying powder and a fixing agent, and is capable of dispersing and storing copying paper. A copy erasing liquid characterized in that a film-forming resin that does not penetrate or chemically or physically bond firmly with the fixing agent is dissolved or dispersed in the form of fine particles in a solvent that dissolves the fixing agent. .

The solvent for dissolving the fixing agent used in the present invention may be any organic solvent that can dissolve the fixing agent used and dissolve or finely disperse the resin, but generally acetone,
Particularly advantageous are those selected from trichloroethane, trichloroethane, trichloromethane, toluene or mixtures thereof or lacquer thinners, etc., or mixtures thereof, in view of their drying speed.

Polyolefins such as polyethylene and polypropylene are used as film-forming resins that can disperse and contain fine powder for copying such as carbon and do not penetrate or chemically or physically bond firmly to copying paper (mounting paper). etc,
Polyvinyl chloride, polyvinylidene, acrylic resins, other synthetic resins that do not have groups that are functional to the mount, or mixtures thereof.

Particularly preferred are the various resins commercially available for coatings. Examples include vinyl chloride resin for coating, polyethylene resin for coating, and plastic resin for coating for rust prevention. Even if the resin does not dissolve in the solvent, it is advantageous to have a resin that can be well dispersed in the solvent in the form of fine particles. It is desirable that after being dispersed, these fine particles can penetrate into felts and brushes by capillary action without changing the concentration along with the solvent. Particularly advantageous are particle sizes of 0.09 μm or less.

There is no particular limit to the mixing ratio of the solvent and the resin, but it is desirable that the concentration is such that it can sufficiently penetrate the felt and brush by capillary action, and if the resin is too small, it will be included in the toner dissolved by the solvent. The adhesive becomes so effective that it is refixed to the copy paper (mounting paper), and too much resin results in a solution that is so impermeable that it interferes with capillary action. A particularly preferred mixing ratio of solvent and resin is 1:0.1 to 1:5 in the case of a solution, and 1:1 to 1=5 in the case of a dispersion.

The copy erasing liquid of the present invention will be explained based on its usage pattern.

When the copy erasing liquid of the present invention is applied to a copy fixed on a paper surface by rubbing with a brush or felt, the toner and fixing agent of the copy are dissolved by the solvent and the fixation is separated. In this case, the fine copying powder floats on the surface of the solution or in the solution, and the fixing agent is diluted by the solution and its adhesion ability is reduced or lost. After the solvent evaporates, the resin, which has returned to its original solid state and contains the copying powder and the fixing agent that has lost its adhesive strength, remains in the form of a film on the copy paper. This film-like material can be easily and completely peeled off from the surface of the paper by rubbing it with an eraser, fingertips, etc.

After the film-like material is removed, the copy paper almost returns to its original state.

The principle of erasing copies using the copy erasing liquid of the present invention will be explained below with reference to the drawings: Figures 1, 2 and 3 show the process of erasing copies using only a solvent as in the conventional method. It shows. 4, 5 and 6 show the process of erasing a copy using the copy erasing liquid of the present invention.

FIG. 1 is an enlarged cross-sectional view of a copying fine powder (2) being fixed onto a copying paper (1) by a fixing agent (3). Here, (2) and (3) are combined to form a copy (b). FIG. 2 is an enlarged cross-sectional view when a solvent is applied to a copy; in this case, the fixing agent is dissolved and the fixing agent solution (4
) is formed, and the fine powder for copying is accommodated in the solution and dispersed (
(diffusion) and the copies have been erased. FIG. 3 is an enlarged cross-sectional view showing a state in which the fine copying powder (2) is diffused, the solvent is evaporated, and the powder is re-fixed. Such fine copying powder that has been diffused and re-fixed cannot be removed sufficiently by rubbing with a letter eraser or the like after drying.
It remains on the backing paper in a dirty state.

FIG. 4 shows an enlarged view of the same state as FIG. 1 above.

FIG. 5 is an enlarged view of the same state as FIG. 2 above. However, 5) is a mixed solution of a fixing agent and a resin.

Figure 6 shows that the solvent has evaporated from the state of (5), and a resin film (6) is formed on the copying paper (mounting paper) in which fine copying powder and a diluted and diffused fixing agent with no adhesive ability are mixed. Indicates the condition. Similar results can be obtained when using the erasing liquid of the present invention in which fine resin particles of 0.09 μm or less are dispersed.

As shown in FIG. 6, the fine powder for copying and the fixing agent are almost completely mixed with the resin and solidified into a film, so that they are not re-fixed on the copy paper. Solidified resin film (6
) can be easily and easily removed by rubbing with an eraser, fingertips, etc. After this removal, the copy paper returns to almost its original state.

Next, the present invention will be explained in more detail with reference to Examples.

Vinyl chloride (Melcoat (trademark) □ Plastic anti-corrosion paint □:
(Washin Chemical Co., Ltd.) and toluene LCC are mixed to produce an erasure liquid.

This erasing liquid was applied to Fuji Xerox's copying machines 2090 and 4.
150 using Ostrich Copy Paper [Dx
Tracing Haha N (65g/m2) 2) Apply erasing liquid to the copied characters by rubbing with a brush. When the toluene in the erasing liquid evaporates and becomes a solid film, the copy is rubbed with a letter eraser (N0M0 PH-09A manufactured by Tombow Pencil Co., Ltd.). Evaluation after erasing is done visually by comparing it with the original paper.

The mixing state of the solvent and powder, the fluidity of the erasing liquid, its applicability, its permeability to felt and brush, the removability of the film after application and drying with an eraser, and the erasability of the copy are examined. The results are shown in Table 1.

1 Ho ■'' Vinyl chloride (Melcote (trademark): Wasshin Chemical Co., Ltd.)
Dissolve 5 g in 10 cc of trichloroethane to prepare an obliteration solution.

Tests and evaluations similar to those in Example 1 are performed using this obliteration liquid. The results are shown in Table 1.

1 g of the same vinyl chloride as in Example 1 was mixed with 4 c of trichloroethane.
Dissolve in c. to prepare obliteration solution.

This obliteration fluid was also subjected to the same tests and inspections as in Example 1, and the results are shown in Table 1.

5 g of vinyl chloride from Example I was mixed with 10 cc of trichloroethane.
Dissolve in to prepare obliteration solution. In this case, 0.0% dioctyl phthalate (DOP) is used as a plasticizer, taking into consideration the entrainment by the eraser (the film curls when peeled off).
Mix 5cc.

This obliteration fluid was also subjected to the same tests and inspections as in Example 1, and the results are shown in Table 1.

An erasing liquid was prepared by dissolving 5 g of polyethylene (Propene (trademark) □ Plastic film paint □ Ni Kansai Paint Co., Ltd.) in 10 cc of trichloroethane.

These obliterating liquids were also subjected to the same tests and inspections as those for the Examples, and the results are shown in Table 1.

Mitsu W Raw J 5 g of vinyl chloride fine powder with an average particle size of 0.009 μm is 15
An obliteration solution is prepared by dispersing it in a solution consisting of cc of trichloroethane and 0.5 cc of DOP.

This obliteration fluid was also subjected to the same tests and inspections as in Example 1, and the results are shown in Table 1.

Northern Calibration Δ A test similar to Example 1 was conducted using Fuji Xerox's Zero Collector (correction fluid) as the erasing fluid, and the results were
Shown in the table.

Tests and inspections similar to those in Example 1 were conducted using acetone, and the results are shown in Table 1.

Comparative Example C Tests and inspections similar to those in Example 1 were conducted using trichloroethane as the obliteration liquid, and the results are shown in Table 1.

Tests and inspections similar to those in Example 1 were carried out using toluene as the expungement liquid, and the results are shown in Table 1.

Tests and inspections similar to those in Example 1 were conducted using lacquer thinner (Asahi Solvent) as the M91 neutralizing solution, and the results are shown in Table 1.

[Brief explanation of the drawing]

1 to 3 illustrate the process of erasing a copy using only a solvent, as in the conventional method, and FIGS.
The figure shows the process of erasing a copy using the copy erasing liquid of the present invention. The symbols in each figure have the following meanings: (1).
... Copying paper (2) ... Fine powder for copying (3) ... Fixing agent (4) ... Fixing agent solution (in the case of Figure 2) (5) ...
Liquid in which resin and fixing agent are dissolved in solvent (6)...Resin film mixed with fine powder for copying (b)...Copy object

Claims (4)

[Claims] (1) In an erasing liquid for erasing unnecessary parts of a copy obtained by fusing and fixing a toner containing a fixing agent,
A film-forming resin that can disperse and contain fine copying powder and a fixing agent and does not permeate the copying paper or strongly bond chemically or physically is dissolved in a solvent that dissolves the fixing agent or in the form of fine particles. Copy erasure liquid, characterized in that it is dispersed in: (2) The copy erasing liquid according to claim 1, wherein the solvent is acetone, trichloroethane, trichloroethylene, trichloromethane, toluene, a mixture thereof, lacquer thinner, or the like. (3) The copy according to claim 1, wherein the resin is a polyolefin, such as polyethylene, polypropylene, etc., polyvinyl chloride, polyvinylidene, acrylic resin, other functional group-free synthetic resin, or a mixture thereof. obliteration fluid. (4) The copy erasing liquid according to claim 1, wherein the resin dispersed in the form of fine particles has a particle size of 0.09 μm or less.