JPS6038429B2 - eraser for pencils - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is useful for erasing handwriting made with a pencil, especially a drafting pencil or a colored pencil, written on drafting tracing paper, drafting film, or sheet paper that is difficult for the erasing liquid described later to penetrate. This article concerns an effective pencil eraser.

Conventionally, solid erasers made of rubber or plastic have been used to erase pencil marks, but this eraser creates a calendar by rubbing, and the carbon black used in pencils is adsorbed onto the shoulder. Because of the principle of removing the dirt by rubbing it repeatedly, it is necessary to rub it repeatedly.
This has disadvantages such as damaging the paper surface and producing dirty eraser dust that has adsorbed carbon black.

Furthermore, pencil lead is made by hardening and molding carbon black or graphite with clay, synthetic resin, etc., so if you rub it with your hand after writing on the paper, the carbon black etc. will rub off and stain the paper surface. . Pencils are indispensable, especially in the field of drafting, but getting the drawings dirty is a big problem.In recent years, pencils have been used with drafting leads, which have good adhesion properties and can be rubbed by hand, especially for tracing paper and film. There are refills for pencils and sharpeners on the market that do not stain the paper even when the paper is smeared, but due to their good adsorption properties, there are currently no erasers that can completely erase any incorrect writing. There is a high demand for something that can erase the traces of. In view of the above-mentioned circumstances, the inventors of the present invention have conducted extensive research into erasing agents for pencil marks, especially pencil marks on drafting paper, and have finally developed a satisfactory erasing liquid, achieving the object of the present invention. It is.

That is, the present invention consists of a pencil eraser and a pencil eraser containing the following general formula as a main component.

(In the formula, R and R are alkyl groups having 1 to 6 carbon atoms, and n is 1
Represents an integer from ~4.

) Examples of erasing liquids that can be used in the present invention include 2-ethoxyethyl acetate, diethylene glycol monomethyl ether acetate, and triethylene glycol monomethyl ether acetate.

In the method for preparing the erasing liquid of the present invention, one type of liquid may be used as is, or two or more types may be mixed and adjusted in an appropriate ratio.

Incidentally, in any case, a fragrance may be added to impart a preferable fragrance. When using the pencil eraser of the present invention, it is sufficient to simply soak a small amount of cloth, paper, absorbent cotton, sponge, etc. and lightly rub it over the handwriting. Although the details of why the eraser of the present invention exhibits high erasability are unknown,
This eraser is a liquid at room temperature, has a very low surface tension, and has a good affinity with paper, so it penetrates between the material being written on and the carbon adsorbed on the writing surface. It is presumed that it has high erasing performance because it lifts up and makes it easier to wipe off with cloth, paper, etc.

Due to this principle, the eraser of the present invention is considered to be particularly effective on paper such as tracing paper and drafting film in which the eraser does not bleed through.
Next, the present invention will be specifically explained with reference to Examples.

Example 1 A solution prepared by adding 1 part by weight of fragrance to 90 parts by weight of 2-ethoxyshetylacetate was used as an eraser.
When I lightly wiped the handwriting written on the Bentel Co., Ltd. Polyfit lead P3) two to three times with a cloth slightly dampened with the above eraser, the handwriting disappeared completely.

After erasing, the film surface was intact and had no abnormalities. Also, when I wrote it down again after erasing it, I was able to write it down without any difference from the first writing. As a comparative test, I tried to erase the exact same handwriting as in Example 1 by rubbing it hard over a dozen times using a commercially available plastic eraser (made of vinyl chloride, drafting eraser), but the handwriting remained thin and could not be completely erased. .

Claims (1)

[Claims] 1. An eraser for pencils whose main component is the general formula ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (in the formula, R and R_1 are lower alkyl groups, and n represents an integer from 1 to 4). 2. The pencil eraser according to claim 1, wherein the lower alkyl group has 1 to 6 carbon atoms. 3. The pencil eraser according to claim 1, wherein the substance represented by the general formula ▲ includes mathematical formulas, chemical formulas, tables, etc. ▼ is 2-ethoxyethyl acetate.