Baked color pencil lead manufactured by impregnation with perhyd

Details Baked color pencil lead manufactured by impregnation with perhyd Baked color pencil lead manufactured by impregnation with perhyd

1995-07-20

1998-03-31

Czaja, Donald E.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

264 295, 264 296, 264 297, 264 41, 264 44, 264 459, 264 78, 264 82, 264 83, 264 85, 523164, C01B 3100

Patent

active

057334820

ABSTRACT:
By kneading a composition containing a filler and an organic forming binder, extruding the composition, baking the composition in a non-oxidizing atmosphere, there is obtained a first baked lead containing, as a binder, a carbon obtained by the carbonization of the organic forming binder. Then, by heating the first baked lead in an oxidizing atmosphere to remove the binder carbon, there is formed a second baked lead composed of at least the filler. The pores of the second baked lead are impregnated with a solution containing perhydropolysilazane, subjecting the lead to a heat treatment in an inert atmosphere or an ammonia gas atmosphere to form a third baked lead containing the resultant silicon nitride. Finally, ink is filled into the pores of the third baked lead to provide a baked color pencil lead.

REFERENCES:
patent: 1502763 (1924-07-01), Bugbee
patent: 3446878 (1969-05-01), Tsukahara
patent: 3592883 (1971-07-01), Kawakubo
patent: 4535007 (1985-08-01), Cannady
patent: 4543344 (1985-09-01), Cannady
patent: 4847345 (1989-07-01), Takamizawa et al.
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patent: 5030702 (1991-07-01), Vaahs et al.
patent: 5595589 (1997-01-01), Hoshiba et al.
Database WPI, Week 8939, Derwent Publications Ltd., London, GB; AN 89-280942 & JP-A-01 203 476 (Toa Nenryo Kogyo KK), 16 Aug. 1989 (Abstract only).

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