JPS6039102B2 - pencil eraser - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an eraser shell that is effective for erasing handwriting of a pencil, particularly a drafting lead or a colored pencil, written on paper, tracing paper, or drafting film.

Conventionally, solid erasers made of rubber or plastic have been used to erase pencil marks, but these erasers create scraps by rubbing, and the carbon black used in pencils is absorbed into the scraps. Due to the principle of removing
This requires repeated and strong rubbing operations, which has disadvantages such as damaging the paper surface and producing dirty eraser dust that has adsorbed carbon black.

Furthermore, pencil leads are made by hardening carbon black or graphite with clay or synthetic fibers and heat-treating them, so if you write on the paper and then rub it with your hand, the carbon black etc. will rub off and stain the paper. In particular, pencils are necessary for drafting, but getting the drawings dirty has been a big problem, but in recent years pencils have been replaced with drafting leads, which have good adhesion to tracing paper and film paper. There are refills for pencils and sharpeners on the market that do not stain the paper surface even when the paper is smudged, and these have been used quite often.

However, because of its good adhesion, there is currently no eraser that can completely erase the marks left behind when making corrections later, so there is a high demand in the market for something that can erase the marks left by drafting lead. The present invention has been made with the object of solving the above-mentioned drawbacks of the conventional pencil eraser.

That is, the present invention relates to general formula (1) (R, R, is day or C
, ~C8 alkyl group, R2 is P-hydro.

The gist of the invention is a pencil eraser equipped with an absorbent carrier containing a compound represented by a quichethyl group or a C, to C8 alkyl group. Substances corresponding to general formula (1) of the present invention include N-8 hydroxyethylacetamide, N.
N-methyl-8-hydroxyethylformamide, N-methylformamide, N-ethylformamide, N・N-
Dimethylformamide, N・N-dimeracetamide,
Examples include N-methyl N-ethylformamide, N-methylpropionamide, N.N-1'-octylacetamide, and the like.

In addition, the absorbent carrier used in the present invention includes barium sulfate,
Talc, Litopone, Shirasu Balloon Zeolite, SBR
Alternatively, inorganic substances with a large specific surface area such as hollow bodies prepared by an interfacial reaction method, oral molecular substances, microcapsules, etc. may be mentioned.

The manufacturing method of the present invention is as follows. In other words, the general formula (
As a preparation method for absorbing the compound (1) shown in 1) into an absorbent body, one type of compound (1) may be absorbed into a carrier, or two or more types may be mixed in an appropriate ratio and absorbed into a carrier. In this case, the above compound may be dissolved in a solvent such as alcohol, ether, or ester that does not damage the drawing film or paper in an amount of at least 6% by weight to improve absorption into the carrier. good. Incidentally, in any case, a fragrance may be added to impart a preferable fragrance. There are many methods for absorbing the compound (1) into the carrier, and effective methods include, for example, absorption filtration, pressurization, vacuum depressurization, hawk frame, etc. The carrier prepared in this way is
It contains 500 cc of compound (1), and the content can be appropriately selected as necessary. Pencil erasers equipped with carriers that have absorbed the compound (1) include felt-like ones made of elastic bodies made of rubber or plastic, felt non-woven fabrics, or bundles of fibers such as polyester cellulose. However, preferably, it is particularly effective to place it on the eraser in combination with the effect of the eraser itself.

Although the details of the reason why the pencil eraser of the present invention exhibits high erasability when erasing marks, such as marks written with a drafting lead on a drafting film, are unknown, 1. When a carrier that has absorbed Compound (1) is placed, the compound (1) oozes out from the carrier by rubbing.

This compound (1) has a very high penetrating power and has good affinity with the film, so it can lift the carbon etc. adsorbed on the film surface, erase it, and just have it adsorbed on the shoulder. Like an eraser,
There is no need for strong force to forcibly remove carbon etc. with the eraser shoulder, and only a small eraser shoulder is required to adsorb the floating carbon, and the liquid acting on the paper surface is gradually supplied by rubbing. It is presumed that the amount of liquid used is the minimum necessary, and that excess liquid is absorbed by the eraser dust, and that the paper surface is always dry, resulting in rapid and high erasability. Due to this principle, the pencil eraser of the present invention is considered to be particularly effective. Furthermore, a fiber pen provided with a porous carrier containing the compound (1) exhibits the same effect as the above-mentioned eraser in that it does not have an eraser shoulder like an eraser.

Incidentally, by scraping off the inevitably dirty pen tip, the pen can always be used in the same condition as when it was first used, and for example, by making notches like a knife cutter on the pen tip, it becomes much easier to use. The present invention will be explained below with reference to Examples. Example 1 A mixture of 2 parts by weight of N-methylformamide and 20 parts by weight of lithopone was added to the following composition, mixed well, kneaded at 130° C., and molded in a press to obtain an eraser.

Blend composition Won121 (vinyl chloride base resin, manufactured by Nippon Zeon Co., Ltd.) 10 parts by weight D.
0. P (plasticity, manufactured by Daihachi Chemical Industry Co., Ltd.) 100 〃 Kronos KA-20 (reinforced titanium, manufactured by Titanium Industry Co., Ltd.) 5 〃MARKSC
-32 (stabilizer, manufactured by Adeka Argus Chemical Co., Ltd.)
3. Using the above eraser, use a drawing refill [Polyfit lead P-2 manufactured by Bentel ■] on a drafting film [Neoart manufactured by Somar Kogyo ■] that has been overcoated with thermosetting resin.
] When I rubbed the handwriting several times, the handwriting completely disappeared.

Further, the surface of the drawing film was not scratched or stained after erasing. When I erased it and rewritten it, I was able to rewrite it without any changes. As a comparative test,
I tried to erase the same handwriting as in Example 1 by rubbing it hard over ten times using a commercially available plastic eraser, but the handwriting remained thin and could not be completely erased, leaving a large amount of erased marks on the film. Example 2 Parts by weight of N-N-dimethylformamide 2 were added to magnesium-silicate microballoons 25 by an interfacial reaction method.
Geon
121 10 parts by weightD. 0
．． P 120 〃MA
RK SC-32 3
Kronos KA-20 5 A pencil eraser was manufactured in the same manner as in Example 1, except for the procedure.

Example 3 A pencil eraser was produced by processing the same composition as in Example 2, except that 2 parts by weight of N-3 hydroxyethyl acetamide and 15 parts by weight of Shirasu balloon were used. .

As described above, the pencil erasers manufactured in Examples 2 and 3 were used to prepare a drafting film [Chemical Trester C manufactured by Somar Kogyo Co., Ltd.].
-300] Drafting lead [Polyfit lead P made by Bentel ■
-1], the handwriting written using colored pencils (manufactured by Company C) and mechanical pencil refills (Hypolymer lead HB manufactured by Bentel ■) was completely erased by rubbing it several times. .

A commercially available drafting eraser [U. S
．． Even if you rub the same handwriting as above ten times using a commercially available plastic eraser and a commercially available plastic eraser, the handwriting made with the refill for mechanical pencils does not match the drawing U. S. Except for the ones that could be completely erased with the A-made eraser, quite a bit of handwriting remained on all of them.
As can be seen from the above explanation, the pencil eraser according to the present invention has fully achieved its purpose.

Claims (1)

[Claims] 1 The following general formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (R and R_1 are H or an alkyl group of C_1 to C_8, R
A pencil eraser characterized by disposing an absorbent carrier containing a compound represented by a β-hydroxyethyl group or an alkyl group of C_1 to C_8.