Title:
FIRED SOLID DRAWING MATERIAL
Document Type and Number:
WIPO Patent Application WO/2021/251480
Kind Code:
A1
Abstract:
Provided is a fired solid drawing material with a high strength, which produces a drawing line with satisfactory color and transparency, regardless of whether the lead thereof is a black lead or a color lead. This fired solid drawing material at least comprises a structural lead formed of a filler and a binder and is characterized in that the transparency level T of a drawing line produced therewith, which is calculated using the following equation (I), is 0.8 or more. Equation (I): T = (L*w - L*b) / (L*b - L*p) where L*w is the brightness of a drawing line produced on a piece of white paper, L*b is the brightness of a drawing line produced on a piece of black paper, and L*p is the brightness of a piece of black paper.
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Inventors:
KUBO RYOTA (JP)
BANZAI SATORU (JP)
BANZAI SATORU (JP)
Application Number:
PCT/JP2021/022271
Publication Date:
December 16, 2021
Filing Date:
June 11, 2021
Export Citation:
Assignee:
MITSUBISHI PENCIL CO (JP)
International Classes:
B43K19/00; C09D13/00
Foreign References:
| JP2015227426A | 2015-12-17 | |||
| JP2010077329A | 2010-04-08 | |||
| JP2005023182A | 2005-01-27 | |||
| JP2009029906A | 2009-02-12 | |||
| JP2019099633A | 2019-06-24 | |||
| JPH08302269A | 1996-11-19 | |||
| JP2004285250A | 2004-10-14 | |||
| JP2016302269A | ||||
| JP2004285250A | 2004-10-14 | |||
| JP2004315602A | 2004-11-11 | |||
| JP2005023182A | 2005-01-27 | |||
| JP2019099633A | 2019-06-24 |
Attorney, Agent or Firm:
FUJIMOTO Eisuke et al. (JP)
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