JPS61127397A - Eraser for compensating 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 (Field of Industrial Application) The present invention relates to an eraser for correcting images formed by electrostatic copying.

(Prior art) In recent years, electrostatic copying has come to be used to create industrial drawings, and among the papers used, it is especially useful for forming images on highly transparent papers such as tracing paper. The use of drafting film as a second original drawing with an image formed thereon is increasing.

Images were formed on plain paper such as tracing 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 was 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, and xylene; chlorinated hydrocarbons such as trichlorethylene as a melt-fixing agent for toner; and esters, ketones, aliphatic hydrocarbons, etc. alone or as appropriate It is used mixed with.

However, in this method, after the toner is dissolved, it is wiped off, so a solvent with good solubility is used on both sides of 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. 48-15420
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 performed quickly, and it could not be called an easy correction method.

Furthermore, since the solvent is applied directly to one image, it is impossible to correct general paper such as high-quality paper whose fibers are not dense because the dissolved toner penetrates into the fibers of the paper.

(Objective of the Invention) In view of these circumstances, the inventors of the present invention have found a substance that has particularly excellent solubility among toner solvents, and if it can be incorporated into an eraser, the above-mentioned problems will be solved. The present invention was finally completed as a result of intensive research from the viewpoint of C-hi.

(Structure of the Invention) That is, 1. The gist of the present invention is an eraser for correcting electrostatic copying images, which is characterized in that the eraser contains a solvent represented by the following general formula as a core material and soybean powder bed method microcapsules. It is something.

(General formula) (In the formula, R+=H, C2H5, Rz=H, CzHs) The present invention uses microcapsules whose core material is the solvent shown in the above general formula, which exhibits particularly excellent solubility among toner solvents, as an eraser. Since the solvent does not come into direct contact with the paper or film surface, it does not stain the paper or film surface, and it also shows excellent erasability for one image.
In addition, since the solvent shown in the above general formula has a relatively high boiling point, it has excellent stability over time as an eraser.
Odors and the like during use can be alleviated as much as possible.

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

The solvent as the core material of the powder bed microcapsules contained in the eraser can be represented by the following general formula, and specific examples thereof are shown in the table below.

(General formula) (In the formula, R+=H, C2H5R2=H, C2Hs) (The above is manufactured by Nippon Steel Chemical Industry Co., Ltd.) These solvents can be used alone or in a mixture of two or more, and the amount used depends on the eraser comb. 5-50 for the whole amount
% by weight, preferably from 5 to 30% by weight.

Way 2: A brief description of the eraser manufacturing method of the present invention will be given.0 First, the powder bed method microcapsule, which is superior to other methods in terms of ease of manufacturing and mass production, is based on the above-mentioned core. Silica-walled microcapsules can be obtained by stirring the substance 1, for example, in ultrafine silica powder at high speed according to a conventionally well-known method. Here, the amount of the above-mentioned solvent is adjusted to be 75 to 35% by weight, preferably 75 to 50% by weight based on the total amount of the microcapsules. Next, a plasticizer, a stabilizer,
The powder bed method microcapsules described above are added to a paste made by adding a filler and, if necessary, pigments, fragrances, abrasives, etc., and uniformly dispersed.

By heating and molding, the desired eraser can be easily obtained.

(Example) The present invention will be described below in detail based on an example - Powder bed method for producing microcapsules> 105 parts by weight of diethyl diphenyl (manufactured by Nippon Steel Chemical Co., Ltd., Allosizer 404) (hereinafter simply referred to as "parts") ) and Nip Seal LP (manufactured by Nippon Shirikani Gyogyo) 30
135 parts of a paste-like material was obtained, and this was stirred at high speed in 30 parts of ultrafine silica powder to obtain silica-walled microcapsules.

<Eraser manufacturing method> Polyvinyl chloride (Nippon Zeon ■Ge0n121) 1
50 parts Dioctyl phthalate (plasticizer) 150 parts Epoxidized soybean oil (stabilizer) 3 parts Calcium carbonate (filler) 10 parts The above ingredients were stirred and mixed to obtain 313 parts of a salt paste, which was then After adding 165 parts of 712 micro-particles produced by the powder bed method and stirring and mixing uniformly, press molding was performed at 110C for 20 minutes to obtain an eraser.

(Effect of the invention) When the eraser obtained in the above example was rubbed 10 times on the electrostatic copying images formed on tracing paper and drafting film, the images were easily erased and corrected in both cases. I can do it.

No stains were found in the repair marks.

As described in detail above, the two erasers for electrostatic copy image correction according to the present invention exhibit excellent erasability.

What's more, you won't be able to see any dirt on the correction marks either.

An excellent eraser that can be used on general paper, such as high-quality paper that does not have dense fibers, because the solvent that dissolves the toner is absorbed by the eraser waste, so the solvent that dissolves the toner does not penetrate into the paper and cause problems. It can be said that.

Claims (1)

[Scope of Claims] An eraser for correcting electrostatic copying images, characterized in that the eraser contains powder bed method microcapsules whose core material is a solvent represented by the following general formula. (General formula) ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (In the formula, R_1=H, C_2H_5R_2=H, C_2H
＿５）