Calcined pencil leads and method of manufacturing the same

Details Calcined pencil leads and method of manufacturing the same Calcined pencil leads and method of manufacturing the same

1995-11-07

1997-07-08

Klemanski, Helene

Compositions: coating or plastic

Coating or plastic compositions

Marking

C09D 1300, B43K 1918

Patent

active

056456298

ABSTRACT:
There are herein disclosed calcined pencil leads which have a high strength, excellent light resistance and weathering resistance as well as a sharp color and which can easily be erased by an eraser, and a method of manufacturing the calcined pencil leads.
In the calcined pencil leads containing, as at least a colorant, a pigment obtained by forming the pigment in the open cells of the pencil leads, the pigment can be obtained by any of
(1) a process of impregnating the open cells with a solution containing the dissolved organic pigment, and then solidifying the pigment,
(2) a process of impregnating the open cells with a solution containing a pigment precursor, and then reacting it, and
(3) a process of impregnating the open cells with a dye solution, and then forming a lake.

REFERENCES:
patent: 2566753 (1951-09-01), Van Dusen Jr. et al.
patent: 5346540 (1994-09-01), Schlennert

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