JPS55139472A - Color pencil lead - Google Patents
Color pencil leadInfo
- 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
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
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)
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 |
-
1979
- 1979-04-18 JP JP4749679A patent/JPS55139472A/en active Pending
Cited By (4)
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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