Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1986-03-11
1987-10-20
Newsome, John H.
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
4273977, B05D 302
Patent
active
047013451
ABSTRACT:
An improved process for coating an inert substrate, such as braided glass fiber sleeving and inert substrates of other materials and shapes, wiht a polymeric material such as a polyacrylate, a polyvinyl chloride, a silicone rubber, or a polyfluorocarbon, said method comprising the steps of: formulating an emulsion of the polymerizable material in water or other suitable polar phase; thickening the emulsion through the addition of an inert, finely-divided, particulate, hydrophilic inorganic oxide substance to a viscosity in the range of from about 35,000 to about 500,000 centipoises; applying the thicknened emulsion in the form of a uniform coating of desired thickness to the sleeving or other inert substrate; passing the coated substrate through a microwave energy chamber and subjecting the thickened emulsion coating to microwave energy of a frequency, at a power density, and for a peirod of time sufficient to substantially devolatilize, or dry and coalesce, said emulsion; and subjecting the devolatilized coating to thermal energy at a temperature and for a period of time sufficient to substantially complete polymerization.
A braided glass fiber sleeve, or inert substrate of other configuration or material, containing a surface coating of a polymer, such as a polyacrylate, a polyvinyl chloride, a silicone rubber, or a fluoropolymer, such coating having substantially uniformly distributed therethrough very finely-divided particles of a chemically inert, hydrophilic, inorganic oxide, such as fumed silica, precipitated silica or aluminum oxide.
REFERENCES:
patent: 3583882 (1971-06-01), Bartrug
patent: 3619252 (1971-11-01), Roscher
patent: 3861945 (1975-01-01), Hartzell
patent: 3930076 (1975-12-01), Kliment
Giatras James L.
Mang Warren G.
Marino Charles P.
Needling Michael C.
Pezdirtz George F.
Drobile James Albert
Markel Corporation
Newsome John H.
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