Method for the preparation of pencil lead

Details Method for the preparation of pencil lead Method for the preparation of pencil lead

1989-10-12

1991-12-24

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

106 19, 264 56, C04B 3332

Patent

active

050750542

ABSTRACT:
A method and composition are disclosed for the preparation of pencil lead from clay, graphite and optionally other material, wherein the clay or the clay/graphite mixture is digested with water, pressed, dried and fired, and at least one alkali phosphate, alkali borate and/or alkali carbonate is added before or as part of the digestion of the clay or the clay/graphite mixture.

REFERENCES:
patent: 2013584 (1935-09-01), Schwenhausser
Cassidy John E., Phosphate Bonding Then and Now, in Cermic Bulletin, vol. 56, No. 7 (1977) pp. 640-643.

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