Compositions: coating or plastic – Coating or plastic compositions – Corrosion inhibiting coating composition
Patent
1978-08-24
1980-06-24
Lieberman, Allan
Compositions: coating or plastic
Coating or plastic compositions
Corrosion inhibiting coating composition
106271, 106272, 260 13, 260 174R, 260 174ST, 260 296H, 260 296B, 260 18N, 260 18R, C09D 1300
Patent
active
042093325
ABSTRACT:
A method for manufacturing pencil leads which comprises thoroughly mixing 100 parts by weight of graphite, 30 to 60 parts by weight of a water-soluble nigrosine, an emulsion containing 10 to 30 parts by weight of wax, and water together, extruding the resultant base mixture from a die into rods of a desired diameter, drying the rods to remove the water contained therein, and then baking the rods at elevated temperatures. The base mixture may contain 10 to 30 parts by weight of a water-soluble organic nonelectrolyte of high molecular weight such as cellulose ethers and/or not more than 10 parts by weight of carbon black in relation to 100 parts by weight of graphite so as to further improve the quality of the leads obtained.
REFERENCES:
patent: 2566754 (1951-09-01), Van Dusen, Jr. et al.
patent: 2645582 (1953-07-01), Loy
patent: 2682476 (1954-06-01), Loy
Lieberman Allan
Sakura Color Products Corp.
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