# US 2014/0150203 A1 · Erasing member and erasing tool using the same

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- Number: US 2014/0150203 A1
- Document ID: US20140150203A1
- Status: Published application
- Kind: A1
- Application number: 14/088,795
- Filed: 2013-11-25
- Published: 2014-06-05
- Earliest claimed: 2012-12-05
- Assignees: Mitsubishi Pencil Company, Limited
- Applicants: Mitsubishi Pencil Company, Limited
- Inventors: Satoru Banzai; Toshimi Kamitani; Yosuke Setagawa; Hitoshi Kino; Tooru Nakajima
- Web page: https://patentgrep.com/patent/US20140150203A1

## CPC

- B43L 19/0025: {Eraser or rubber material, e.g. comprising hard particles}
- B43L 19/0075: {of the pencil type}
- B43L: ARTICLES FOR WRITING OR DRAWING UPON; {WRITING OR DRAWING AIDS;} ACCESSORIES FOR WRITING OR DRAWING (workshop equipment for marking-out work B25H7/00; teaching hand-writing or drawing G09B11/00)

## Abstract

Provided are an erasing member which is excellent in erasability for handwritings written by means of a pencil, a mechanical pencil and the like and which does not produce eraser dusts, and an erasing tool in which a part to be erased can be visually recognized in erasing. The erasing member comprises a blend composition containing a liquid-absorbing porous material, and a basic magnesium carbonate porous material and the like can be used as the liquid-absorbing porous material. And in an erasing tool in which an erasing part is formed at one end and in which a transparent or translucent visible part making it possible to visually recognize a writing surface is provided in the vicinity of the erasing part, the erasing member described above is mounted to the erasing part, whereby the erasing tool which does not produce eraser dusts is obtained.

## Claims

### Claim 1

An erasing member comprising a blend composition which contains a liquid-absorbing porous material.

### Claim 2 (depends on 1)

The erasing member as described in claim 1, wherein the liquid-absorbing porous material comprises particles having a specific surface area of 100 to 500 m2/g and a liquid absorption rate of 100 to 300 ml/100 g.

### Claim 3 (depends on 1)

The erasing member as described in claim 1, wherein the liquid-absorbing porous material is a basic magnesium carbonate porous material.

### Claim 4 (depends on 3)

The erasing member as described in claim 3, wherein the basic magnesium carbonate porous material comprises particles in which flaky fine crystals are aggregated.

### Claim 5 (depends on 1)

The erasing member as described in claim 1, wherein a content of the liquid-absorbing porous material is 5 to 40% by mass based on the total amount of the erasing member.

### Claim 6 (depends on 1)

The erasing member as described claim 1, wherein the erasing member further contains a carbon material.

### Claim 7 (depends on 1)

The erasing member as described in claim 1, wherein the erasing member further contains fiber particles.

### Claim 8 (depends on 1)

An erasing tool for erasing handwritings written on a writing surface, wherein an erasing part for erasing the handwritings is provided at one end thereof, and a visible part through which the writing surface can visually be recognized is provided in the vicinity of the erasing part; and the erasing member as described in claim 1 is mounted to the erasing part.