JPS60101098A - Eraser for correcting electrostatic copying picture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an eraser for correcting images formed by electrostatography.

In recent years, electrostatic copying has come to be used to create industrial drawings, and among the papers used, it is used to form images on highly transparent papers such as tracing paper, and to form images on drafting film. Its use as a second original drawing is increasing.

Images were formed on plain paper such as training paper and drafting film by electrostatic copying.

Since the so-called second original image is composed of two images that are fused and fixed together with colored synthetic resin powder called toner, it is often impossible to correct it by simply using an eraser.

Conventionally, such correction of the second original image has been carried out by applying a toner solvent directly to the corrected portion of the image, dissolving the toner, and then wiping it off.

As a toner solvent, it dissolves toner well.

Aromatic hydrocarbons such as benzene, toluene, xylene, etc., chlorinated hydrocarbons such as trichlorethylene as a toner melt fixing agent, and in addition to these, esters, ketones, aliphatic hydrocarbons, etc. Mix and use appropriately.

However, in this method, after the toner is dissolved, it is wiped off, so a solvent with good solubility is only used on the paper.

It has a tendency to stain the film surface.

In addition, in order to reduce staining, water or lower alcohols were mixed with ketones, ethers, and esters that are compatible with water or lower alcohols. Using a solvent (Special Publication No. 4B-55420
No.) There are examples.

Low boiling point, volatile solvents are used to shorten the drying time after correction. For this reason, the correction operation had to be carried out quickly, and it was not an easy correction method. 3. In addition, since the solvent is applied directly to the two images, the dissolved toner may be removed from the paper if the fibers are not dense. It penetrated into the fibers of the fibers and was impossible to repair.

The inventors of the present invention have conducted intensive research based on the viewpoint that the above-mentioned problems can be solved if the toner solvent can be contained in the eraser.

This invention has finally been completed.

That is, 2. The gist of the present invention is an eraser for electrostatic copy image correction, which contains a solvent with a boiling point of 120° C. or higher having the following conditions.9. Conditions: When the hydrogen bonding force is weak: Dissolution The gender parameter (j) is 7,
0 to 11.1 (caJ/c/)" When the hydrogen bond strength is medium, the solubility parameter (i) is 7, 4 to 14.7 (c
In the present invention, since the toner solvent is contained in the eraser, the solvent does not come into direct contact with the paper or film surface, so it does not stain the paper or film surface, and it can also be corrected even on paper where the fibers are not dense. This made it possible.

Two aspects of the present invention will be described in detail below.

The solvent contained in the eraser may be any solvent that dissolves the toner and has a boiling point of 120° C. or more, preferably 200° C. or more, since it can be dispersed in the eraser raw material and heated and molded.

In addition, polystyrene, which is the main resin of toner binder,
The solubility parameters of 2020 differ slightly depending on the manufacturer and grade, but the values are 7.0 to 11 for (weak) hydrogen bonding strength.
．． 1 (L ca1101 engineering &-).

(Medium) and 7.4 to 14.7 (Lcalld go&-)te.

Furthermore, depending on the grade and copolymer, hydrogen bonding strength (
Strong) 9.5 to 14.5 (II cat!/a/,]
-') (Some have D value.

For this reason, as a solvent contained in erasers.

The conditions for dissolving the toner are as follows: the dissolution parameters are hydrogen bond strength (weak) and ZO~11.1. (Middle) Z4-14
．． 5, and because it is dispersed in the eraser raw material and heated and molded, the boiling point mentioned above is 120° C. or higher, preferably 200° C. or higher.

Specific examples of the above-mentioned solvents are shown in the following table.

These solvents can be used alone or as a mixture of two or more. Note that the solvents that can be used are not limited to those mentioned above.

The amount of solvent used is 5 to 50% by weight, preferably 5 to 30% by weight, based on the total amount of the eraser.

Next, the solvent can be contained in the eraser in the form of microcapsules with the solvent as a core material, or
A conceivable form is to contain it as a porous powder adsorbed with a solvent.

, the former has the advantage of less deterioration of performance over time. The microcapsules are produced using conventionally known methods such as Teha, coacervation method + s-bed method, in-5-itu polymerization method, and interfacial precipitation method. It is fine as long as it is something.

Furthermore, although the latter has slightly inferior performance over time compared to the former, it has the advantage of being easier to manufacture and can be manufactured at low cost.

The porous powder may be appropriately selected from inorganic or organic materials that absorb a relatively large amount of mud.

Specific examples include activated alumina, talc, bentonite, calcium carbonate, activated clay, and porous resin powder.

Note that the amounts of microcapsule material (wall material), porous powder, and solvent used are not necessarily uniform depending on the type of microcapsule material and porous powder, but compared to the microcapsule material and porous powder, If the amount of solvent is too small, the erasing effect will be small, and if it is too large, the solvent may seep into the eraser or migrate to the surface of the eraser. The ratio (weight) of the capsule material and porous powder to the solvent is 1:0.4 to 1.
: It is preferable to set it in the range of 10.

Next, the method for manufacturing the eraser will be briefly described.

A conventionally known eraser base material, particularly preferably polyvinyl chloride or polyvinyl chloride, is used as a paste-like product.

The above-mentioned microcapsules and/or porous powder may be added to this paste-like material, uniformly dispersed, and then heated and molded to form an eraser.

The eraser of the present invention described above contains microcapsules and/or
Or, since the toner solvent is held in the porous powder, it is stable over time and does not stain the paper surface or film surface during erasing, and the solvent in which the toner is dissolved can be adsorbed by the eraser waste even on paper with less dense fibers. As a result, the solvent used to dissolve the toner does not penetrate into the paper, making it possible to erase and correct the paper.

Hereinafter, the present invention will be explained in detail based on Examples. In the examples, "1 part" indicates "part by weight."

Example 1 (Production method of microcapsules, powder bed method) 105 parts of 2-phenoquine ethanol and 7 parts of calcium carbonate
5 parts were stirred and mixed to obtain 180 parts of paste.

This was stirred at high speed with 30 parts of ultrafine silica powder to obtain silica wall microcapsules.

(Eraser manufacturing method) Polyvinyl chloride (manufactured by Nippon Zeon ■).

Gcon21) 150 parts dioctyl phthalate (plasticizer) 150 parts epoxidized soybean oil (stabilizer) 3 parts calcium carbonate (filler) 10 parts The above components were stirred and mixed to obtain a vinyl chloride paste.

210 parts of the above-mentioned capsules were added to 616 parts of this salted hechaste, mixed with stirring, and heated to 110°C.

An eraser was obtained by press molding for 20 minutes.

Example 2 (Production method of microcapsules, core cell vanecon method) 80 parts of tetrachlorethylene was dispersed in 150 parts of a 10% by weight aqueous solution of latin, and after gently stirring and emulsifying, 150 parts of a 10% by weight aqueous gum arabic solution was dispersed. 1 part, and then 600 parts of 45°C warm water.

Add acetic acid dropwise to this solution while keeping it at 40℃ or higher.
I) II 4.1. After cooling to 5℃,
25 parts of glutaraldehyde were added.

After being left in this state overnight, the capsules were decanted to form a slurry, spread on a vat, and air-dried to obtain 100 parts of microcapsules containing tetrachlorethylene.

(Eraser manufacturing method) Geon21 150 copies Dioctyl phthalate 150 parts Epoxidized soybean oil 6 parts Calcium carbonate 50 parts The above components were stirred and mixed to obtain a vinyl chloride paste.

1 of the above-mentioned microcapsules was added to 656 parts of this PVC paste.
After stirring and mixing 00 parts, the mixture was heated to 110°C.

An eraser was obtained by press molding for 20 minutes.

Example 5 (Production method of microcapsules, in-liquid curing method) Concentric double orifice tube with xylene on the inside, 06% by weight of sodium alginate on the outside, 12% by weight of polyvinyl alcohol, 12% by weight of glycerin, and 75.4% by weight of water. supply the liquid.

Injected and poured into a 20% by weight calcium chloride aqueous solution,
Microcapsules containing xylene were obtained.

(Production method of eraser) 100 parts of the above-mentioned microcapsules were added to 356 parts of the vinyl chloride paste used in Example 2.

After stirring and mixing, the mixture was press-molded at 110° C. for 20 minutes to obtain an eraser.

Example 4 (Solvent-adsorbing porous powder, inorganic material) 100 parts of activated clay was stirred at high speed, and 5 parts of isophorone was added during stirring.
0 part was added dropwise to obtain activated clay powder adsorbed with isophoro/.

(Production method of eraser) 150 parts of the above-mentioned activated clay powder adsorbed with isophorone was stirred and mixed with 313 parts of the vinyl chloride paste used in Example 1 of the actual hfM, and the mixture was heated at 110°C.

An eraser was obtained by press molding for 20 minutes.

Example 5 (Solvent-adsorbing porous powder, organic substance) 100 parts of Avicel'l'Q-101 (non-chemical, crystalline cellulose) was stirred at high speed, and during stirring 50 parts of ethyl benzoate was added.
0 part was added dropwise to obtain crystalline cellulose powder adsorbing ethyl benzoate.

(Production of eraser) To 356 parts of the PVC paste used in Example 2, 150 parts of crystalline cellulose powder adsorbed with double ethyl benzoate was added, stirred and mixed, and then molded at 110°C for 20 minutes. and got an eraser.

With the erasers of Examples 1 to 5 obtained above.

When images formed by electrostatic copying on training paper and drafting film were rubbed 10 times, the images could be easily erased and corrected1, and no stains were observed in these correction marks.

As described above, the eraser for correcting electrostatic copying images of the present invention exhibits excellent erasability and leaves less stain after correction.

Patent Applicant: Bentel Co., Ltd. Proceeding at the Upper Exit IJE (Voluntary) Sunset, December 1980 Manabu Shiga, Commissioner of the Patent Office 1, Indication of this case 1982 Special Iii'll'! t5208862 No. 2,
Name of IJI: Eraser 3 for electrostatic photocopy image correction.Relationship to the case: Patent applicant: 103 Address: 7, Nihonbashi Kokinumachi, Chuo-ku, Tokyo No. 2 IjJ#1l
Column 6 of IFJ's Detailed Description of the Invention II, amended content and above.

Claims (1)

[Scope of Claims] 1) An eraser for correcting electrostatically copied images, which contains a solvent having a boiling point of 120° C. or higher and having the following conditions. Conditions]> When the hydrogen bonding force is weak, the solubility (Lamécou (S) is 7)
, 0 to 11.1 (cab/cm') - When the hydrogen bond strength is medium, the solubility parameter (S) is 7, 4 to 14.
7 (cal/d)22) The eraser for electrostatic copying image correction according to claim 1, characterized in that the eraser contains microcuff cells containing the solvent as a core material.5) An eraser for correcting electrostatic copying images according to claims 1 and 2, characterized in that the eraser contains a porous powder completely dissolved in a solvent.