Pencil lead and manufacturing method of the same

Details Pencil lead and manufacturing method of the same Pencil lead and manufacturing method of the same

1975-06-16

1977-04-12

Czaja, Donald E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

106 19, 260833, 260844, 264211, C08K 304

Patent

active

040174514

ABSTRACT:
A pencil lead comprises an extrudate of a kneaded blend of a coloring material and a novolak resin or a derivative thereof.

REFERENCES:
patent: 3821157 (1974-06-01), Muller et al.
patent: 3834910 (1974-09-01), Mukai et al.
patent: 3928520 (1975-12-01), Shinomoto et al.
patent: 3953218 (1976-04-01), Pollard
A.P.C. Application of H. Schwappacher, Ser. No. 286693, published 4-20-43.

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