Title:
PENCIL LEAD AND MANUFACTURING METHOD FOR SAME
Document Type and Number:
WIPO Patent Application WO/2023/248969
Kind Code:
A1
Abstract:
Provided are a pencil lead that has sufficient strength during writing even when the tip thereof is sharpened, experiences little degradation due to moisture absorption, is erasable, and can be manufactured without using a temperature higher than 500°C, as well as a manufacturing method for said pencil lead. A pencil lead according to the present disclosure is characterized by including at least a clay for which a 2θ peak appears at 12.4±0.5 and/or 24.5±1.0 in an XRD measurement, a coloring material, and an alkali metal element. A manufacturing method for said pencil lead is characterized in that a clay is dried at 50°C-500°C and configured such that a 2θ peak will appear at 12.4±0.5 and/or 24.5±1.0 in an XRD measurement, the dried clay, a coloring material, and an aqueous solution of an alkali metal hydroxide are mixed, and the mixture is molded and then fired at 50°C-500°C.
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Inventors:
ARAI HIROYUKI (JP)
Application Number:
PCT/JP2023/022539
Publication Date:
December 28, 2023
Filing Date:
June 19, 2023
Export Citation:
Assignee:
MITSUBISHI PENCIL CO (JP)
International Classes:
B43K19/02; C09D13/00
Foreign References:
| JPS62201982A | 1987-09-05 | |||
| JP2005082808A | 2005-03-31 | |||
| CN113493630A | 2021-10-12 | |||
| JPH02155965A | 1990-06-15 | |||
| JPH01217090A | 1989-08-30 | |||
| JP2004285250A | 2004-10-14 |
Attorney, Agent or Firm:
FUJIMOTO Eisuke et al. (JP)
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