Process for producing blackboard crayon
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United States of America Patent
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-
Oct 14, 1986
Grant Date -
N/A
app pub date -
Sep 10, 1985
filing date -
Jan 12, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process for producing blackboard crayon by molding a mixture of calcium carbonate, titanium oxide and zinc oxide in place of conventional calcined gypsum or chalk, a resinous material primarily containing paraffin, beef tallow or palm oil as a coagulant, and a solvent, into a stick form. The blackboard crayon does not scatter dust.
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Cited Art Landscape
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