JPH0686160B2 - Eraser for electrostatic copy image correction - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an eraser for correcting an image formed by an electrostatographic method.

(Prior Art) In recent years, the electrostatographic method has come to be used for producing industrial drawings. Among the papers used, particularly, an image is formed on highly transparent paper such as tracing paper, or The use as a second original drawing in which an image is formed on a drafting film is increasing.

An image is formed on plain paper such as tracing paper and a film for drawing by the electrostatic copying method, so-called second original drawing, because the image is composed of melted and fixed colored synthetic resin powder called toner. ， In many cases, it cannot be corrected by just erasing the eraser.

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

As a toner solvent, it dissolves toner well, pens,
Aromatic hydrocarbons such as toluene and xylene, chlorinated hydrocarbons such as trichlorethylene as a melt fixing agent for toner, and other than these, esters, ketones, aliphatic hydrocarbons, etc., alone or appropriately mixed. And is using it.

However, in this method, since the toner is dissolved and then wiped off, a solvent having a better solubility tends to stain the paper surface and the film surface.

In addition, in order to reduce stains, there is an example in which a solvent is used in which water or a lower alcohol is mixed with ketones, ethers and esters compatible with it, and a solvent is used (Japanese Patent Publication No. 48-35420). A low boiling point, volatile solvent is used to shorten the drying time after modification. For this reason, the correction operation had to be performed quickly, and it was not a simple correction method.

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

(Object of the Invention) In view of these circumstances, the present inventor has found the substance having particularly excellent solubility among the solvents of the toner, and if the substance can be contained in the eraser, the above-mentioned problems occur. The present invention has been finally completed as a result of intensive research conducted from the viewpoint that it will be resolved.

(Structure of the Invention) That is, the gist of the present invention is an eraser for electrostatic copy image correction, characterized in that a powder bed microcapsule containing a solvent represented by the following general formula as a core substance is contained in an eraser. It is a thing.

(General formula) (In the formula, R ₁ = H, C ₂ H ₅ , R ₂ = H, C ₂ H ₅ ) The present invention uses a solvent represented by the above general formula, which has particularly excellent solubility among toner solvents, as a core substance. Since the microcapsules are contained in the eraser, the solvent can
Not only does it not stain the paper or film surface because it does not come into contact with the film surface, it also exhibits excellent erasability for images, and the solvent shown in the above general formula has a relatively high boiling point. As an eraser, it has excellent stability over time and can reduce odors during use as much as possible.

Hereinafter, the present invention will be described in detail.

The solvent, which is the core substance of the powder bed method microcapsules contained in the eraser, is represented by the following general formula, and its specific examples are as shown in the table below.

(General formula) (In the formula, R ₁ = H, C ₂ H ₅ R ₂ = H, C ₂ H ₅ ) These solvents can be used alone or as a mixture of two or more kinds, and the amount thereof is 5 to 50% by weight, preferably 5 to 30% by weight based on the total amount of the eraser.

Next, a method of manufacturing the eraser according to the present invention will be briefly described.

First, the powder bed method microcapsules, which are superior to other methods in terms of easiness of production and mass productivity, are prepared by using a solvent as a core substance described above in, for example, ultrafine silica powder, according to a conventionally known method. By stirring at high speed, silica wall microcapsules can be obtained. Here, the amount of the solvent mentioned above is 75 to 35% by weight, preferably 75 to 50% by weight based on the total amount of the microcapsules.
Set to be weight%. Next, a conventionally known eraser base material, particularly preferably polyvinyl chloride or a copolymer of polyvinyl chloride and polyvinyl acetate, a plasticizer, a stabilizer, a filler, and if necessary, a pigment, a perfume, The desired eraser can be easily obtained by adding the above-mentioned powder bed method microcapsules to a paste-like material by adding an abrasive or the like, and uniformly dispersing and then heat-molding.

(Example) Hereinafter, the present invention will be described in detail based on examples.

<Production method of powder bed method microcapsules> 105 parts by weight of diethyldiphenyl (produced by Nippon Steel Chemical Industry Co., Ltd., Alocizer 404) (hereinafter simply referred to as "part") and Nipseal LP (produced by Nippon Silica Industry Co., Ltd.) )
Thirty parts were mixed by stirring to obtain 135 parts of a paste, and this was rapidly stirred in 30 parts of ultrafine silica powder to obtain silica wall microcapsules.

<Manufacturing method of eraser> Polyvinyl chloride (Neon Zeon Co., Geon121) 150 parts Dioctyl phthalate (plasticizer) 150 parts Epoxidized soybean oil (stabilizer) 3 parts Calcium carbonate (filler) 10 parts Stir the above components By mixing, 313 parts of salt paste paste was obtained, on which silica wall microcapsules prepared by the powder bed method were used.
After adding 165 parts and stirring and mixing uniformly, press molding was performed at 110 ° C for 20 minutes to obtain an eraser.

(Effects of the Invention) When the image obtained by the electrostatic copying method formed on the tracing paper and the drafting film was rubbed 10 times with the eraser obtained in the above example, both images were easily erased and corrected. It was done, and the trace of the correction was clean.

As described in detail above, the eraser for electrostatically copying image correction according to the present invention exhibits excellent erasability, and there is no stain on the correction mark, and it is suitable for general paper such as high-quality paper without dense fibers. On the other hand, it can be said that this is an excellent eraser in that the solvent in which the toner is dissolved is adsorbed by the eraser and the solvent in which the toner is dissolved does not penetrate into the paper and cause a problem.

Claims (1)

[Claims] 1. An eraser for electrostatic copy image correction, characterized in that the eraser contains powder bed microcapsules containing a solvent represented by the following general formula as a core substance. (General formula) (In the formula, R ₁ = H, C ₂ H ₅ R ₂ = H, C ₂ H ₅ )