PENCIL LEAD

PROBLEM TO BE SOLVED: To provide a pencil lead having excellent balance between flexural strength and density. SOLUTION: The pencil lead is obtained by carrying out kneading, extrusion molding into a thin wire shape, and heat treatment to a firing temperature. The pore diameter distribution of the p...

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Bibliographic Details
Main Author FUJIMAGARI HITOSHI
Format Patent
LanguageEnglish
Published 15.04.2004
Edition7
Subjects
ADHESIVES
BUREAU ACCESSORIES
CHEMICAL PAINT OR INK REMOVERS
CHEMISTRY
COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS
CORRECTING FLUIDS
DYES
FILLING PASTES
IMPLEMENTS FOR WRITING OR DRAWING
INKS
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
PAINTS
PASTES OR SOLIDS FOR COLOURING OR PRINTING
PERFORMING OPERATIONS
POLISHES
TRANSPORTING
USE OF MATERIALS THEREFOR
WOODSTAINS
WRITING OR DRAWING IMPLEMENTS
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Summary:PROBLEM TO BE SOLVED: To provide a pencil lead having excellent balance between flexural strength and density. SOLUTION: The pencil lead is obtained by carrying out kneading, extrusion molding into a thin wire shape, and heat treatment to a firing temperature. The pore diameter distribution of the pencil lead is regulated so that ≥80% pores may have diameters within a range of 0.005-0.1 μm, and the ratio (ratio of specific surface areas: S1/S2) of a value (S1) of the specific surface area measured by a CI method based on a multilayer adsorption theory to a value (S2) of the specific surface area by a BET method based on a monolayer molecule adsorption theory is 0.7-1.3. COPYRIGHT: (C)2004,JPO
Bibliography:Application Number: JP20020282378