JPS55139472A - Color pencil lead - Google Patents

Color pencil lead

Info

Publication number
JPS55139472A
JPS55139472A JP4749679A JP4749679A JPS55139472A JP S55139472 A JPS55139472 A JP S55139472A JP 4749679 A JP4749679 A JP 4749679A JP 4749679 A JP4749679 A JP 4749679A JP S55139472 A JPS55139472 A JP S55139472A
Authority
JP
Japan
Prior art keywords
leads
baked
alumina
wax
dye
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP4749679A
Other languages
Japanese (ja)
Inventor
Masatoshi Abe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TONBO ENPITSU KK
TONBO PENCIL
Original Assignee
TONBO ENPITSU KK
TONBO PENCIL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TONBO ENPITSU KK, TONBO PENCIL filed Critical TONBO ENPITSU KK
Priority to JP4749679A priority Critical patent/JPS55139472A/en
Publication of JPS55139472A publication Critical patent/JPS55139472A/en
Pending legal-status Critical Current

Links

Landscapes

  • Inks, Pencil-Leads, Or Crayons (AREA)

Abstract

PURPOSE: To produce color pencil leads having high strength and qualities stabilized against environmental conditions, by kneading refractory white powders, alumina, a PVA and a wax-like material, extruding the mixture into leads and after baking the leads, impregnating the baked leads with a dye.
CONSTITUTION: To an alumina gel which is a hydrated product of alumina and refractory powders is added an emulsion prepared from a polyvinyl alcohol, a wax- like material which is effective as a lubricant, an emulsifier and water. The resulting mixture is kneaded and extruded into leads through an extruder. The extruded leads are treated at 50W80°C for 5W100hr, so that the water remaining in the leads is evaporated without forming bubbles and without causing crazing and blistering. Further, in order to prevent crazing and blistering due to thermal decomposition of carbon compounds, the leads are baked into black leads containing a carbonized residue, in a non-oxidizing atmosphere. The black leads, then, are baked at 600W1,100°C into white porous leads having micropores. The porous leads are impregnated with any dye.
COPYRIGHT: (C)1980,JPO&Japio
JP4749679A 1979-04-18 1979-04-18 Color pencil lead Pending JPS55139472A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4749679A JPS55139472A (en) 1979-04-18 1979-04-18 Color pencil lead

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4749679A JPS55139472A (en) 1979-04-18 1979-04-18 Color pencil lead

Publications (1)

Publication Number Publication Date
JPS55139472A true JPS55139472A (en) 1980-10-31

Family

ID=12776715

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4749679A Pending JPS55139472A (en) 1979-04-18 1979-04-18 Color pencil lead

Country Status (1)

Country Link
JP (1) JPS55139472A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0697447A1 (en) * 1994-08-05 1996-02-21 Mitsubishi Pencil Kabushiki Kaisha Baked color pencil lead and method for manufacturing the same
US5595700A (en) * 1991-05-02 1997-01-21 Mitsubishi Pencil Kabushiki Kaisha Non-baked color pencil leads and method for preparing same
EP0712914A3 (en) * 1994-11-17 1997-07-02 Mitsubishi Pencil Co Calcined pencil leads and method of manufacturing the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5595700A (en) * 1991-05-02 1997-01-21 Mitsubishi Pencil Kabushiki Kaisha Non-baked color pencil leads and method for preparing same
EP0697447A1 (en) * 1994-08-05 1996-02-21 Mitsubishi Pencil Kabushiki Kaisha Baked color pencil lead and method for manufacturing the same
US5733482A (en) * 1994-08-05 1998-03-31 Mitsubishi Pencil Kabushiki Kaisha Baked color pencil lead manufactured by impregnation with perhydropolysilazane and heat treatment
EP0712914A3 (en) * 1994-11-17 1997-07-02 Mitsubishi Pencil Co Calcined pencil leads and method of manufacturing the same

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