Method for making lead pencils and colored pencils

Details Method for making lead pencils and colored pencils Method for making lead pencils and colored pencils

1988-03-04

1989-08-01

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Stratified or layered articles

106 19, 106105, 106106, 264122, 264172, 26421111, 264246, 264320, 264323, 523164, B29C 4702, B29C 4704, B29C 6700, C09D 1300

Patent

active

048531677

ABSTRACT:
A method for making pencil leads without firing includes taking mixtures of graphite and MgO which are made of Mg salts with MgCl.sub.2 solutions, forming such mixtures into desired shapes (crayons or pencil leads) and hardening them at room temperatures. Colored pencil leads are produced by processing MgO with inorganic or organic colors together with slip additives and MgCl.sub.2 solutions into pressable pastes, and then forming them into leads or crayons for room temperature hardening. To increase breakage resistance, the resulting leads or crayons are encased in wood. The MgCl.sub.2 solutions are mixtures of Sorel's cement, and the slip additive is talcum.

REFERENCES:
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patent: 346002 (1886-07-01), Waite
patent: 449151 (1891-03-01), Enricht
patent: 1282188 (1918-10-01), Catlett
patent: 1308932 (1919-07-01), Catlett
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patent: 4668572 (1987-05-01), Iizuka et al.
patent: 4758540 (1988-07-01), Bard et al.

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