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Eraser

An eraser and liquid technology, applied in the field of erasers, can solve the problems of simultaneous realization of migration resistance and rubber crumb accumulation, and achieve excellent rubber crumb accumulation, high environmental pollution resistance, and excellent migration resistance.

Active Publication Date: 2009-08-26
TOMBOW PENCIL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although erasing ability equivalent to that of conventional products is expected, erasers with excellent migration resistance and scum accumulation are expected, but it is usually extremely difficult to realize both migration resistance and scum accumulation at the same time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0046] (Examples 1-5, Comparative Examples 1-4)

[0047] After mixing and stirring the compounded resin composition shown in Table 2 and vacuum defoaming, it was poured into a 100×100×10mm mold kept at 120-140°C, heated for 30 minutes, cooled, and taken out from the mold to obtain a test sample. Sample. The erasing rate, rubber crumb accumulation and mobility of each sample were measured according to the above method, and the results are shown in Table 2.

[0048] Table 2

[0049]

[0050] As can be clearly seen from Table 2, by blending a liquid acrylic polymer as a plasticizer, an eraser excellent in migration resistance and accumulation of rubber crumbs can be obtained. In addition, it was found that when a liquid acrylic polymer and other plasticizers are used in combination, both the migration resistance and the accumulation of rubber crumbs are improved compared to the conventional eraser containing only ester plasticizers.

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Abstract

Provided is a plastic eraser excellent in safety and environmental pollution resistance and, not detracting from the erasability thereof, further excellent in bleeding resistance and eraser dust gatherability. The eraser comprises a base resin such as a vinyl chloride resin and, as incorporated therein as a plasticizer, a liquid acrylic polymer having a glass transition point (Tg) of not higher than 0 DEG C. The eraser may comprise the liquid acrylic polymer alone or as combined with one or more other plasticizers. Containing the liquid acrylic polymer as a plasticizer, the eraser has excellent bleeding resistance and excellent dust gatherability which could hardly be balanced.

Description

technical field [0001] The present invention relates to an eraser, and more specifically, to an eraser having excellent character-erasing performance and excellent migration resistance and accumulation of eraser dust. Background technique [0002] Eraser (commonly known as eraser) is widely used as an indispensable stationery for erasing handwriting because of its excellent word-erasing performance. Erasers are usually produced by using the following method: adding plasticizers to the base resin, and then appropriately adding stabilizers, coloring materials, spices and other eraser materials as needed, after mixing and stirring, press molding, injection molding, extrusion Forming methods such as molding are produced by heating and forming. [0003] Plasticizers can be used to impart flexibility, durability, cold resistance, and electrification characteristics to various substrate resins. In erasers, black lead, which is friendly to the object of erasing, is often used in te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L101/00C08L33/00C08L27/06B43L19/00
CPCB43L19/0025C08L33/06C08L27/06C08L2666/04
Inventor 山田岳
Owner TOMBOW PENCIL CO LTD
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