DETAILED DESCRIPTION What is claimed is: 1.
A process for the preparation of an electrically conductive coating composition comprising a particulate component and a vehicle, said process comprising preparing a particulate, homogeneous blend of: A.
about 60 to about 98% by weight of graphite, B.
about 1.
5 to about 20% by weight of manganese dioxide, and C.
about 0.
5 to about 20% by weight of zinc oxide, each of said percentages based on the total weight of said blend; and mixing said blend with an organic or inorganic vehicle which does not dissolve said particulate blend, to thereby form a homogeneous composition suitable for application to a substrate and capable of being adhered thereto, and which when cured thereon forms an infrared radiating coating when an electric current is passed through said coating.
2.
Process according to claim 1 in which the vehicle is comprised of a binder or binder and a solvent for the binder.
3.
Process according to claim 2 wherein the binder is substance selected from the group consisting of: acrylics, alkyds, cellulosics, epoxies, fluoroplastics, ionomers, nylons, phenolics, polyamides, polyimides, polybutadienes, polyesters, polypropylenes, polyurethanes, silicones, natural resins and rubbers, stryrene-butadienes, nitrile rubbers, polysulfide rubbers, polyvinyl acetate, polyvinyl alcohols, silicates, polysilicates, hydraulic-setting Portland cements, sodium aluminates, gypsum, glass and glass frit compositions; ceramic and refractory compositions; and minerals, bentonites and mixtures thereof.
4.
Process according to claim 3 wherein the amount of (A) is about 92.
6%, (B) is about 6.
2% and (C) is about 1.
2% by weight.
5.
Process according to claim 3 wherein (A) consists of crystallites having a particle size of from about 250 microns to about 1 micron.
6.
Process according to claim 3 wherein (A) consists of crystallites having a particle size of from about 75 microns to about 2 microns.
7.
Process according to claim 3 wherein (A) consists of about 69.
4% crystallites having a particle size of about 75 microns and about 23
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