Title:
FIRED PENCIL LEAD
Document Type and Number:
Japanese Patent JP2012046718
Kind Code:
A
Abstract:
To provide a fired pencil lead with smaller dispersion of bending strength and density since a plasticizer, which is used in a fired pencil lead core and makes the structure of the fired core uneven by its compatibility and migration with a synthetic resin, is a cause of dispersion of bending strength and density.
In the fired pencil lead core using at least graphite and a chlorine-containing resin as compounding materials, a copolymer comprising carbon monoxide and ethylene is used as a compounding material.
Inventors:
ARAKI SHOHEI
ISHIZUKA KUNIHIKO
ISHIZUKA KUNIHIKO
Application Number:
JP2011019314A
Publication Date:
March 08, 2012
Filing Date:
January 31, 2011
Export Citation:
Assignee:
PENTEL KK
International Classes:
C09D13/00; B43K19/02
Domestic Patent References:
JPS62246976A | 1987-10-28 | |||
JP2012116946A | 2012-06-21 |