Coating processes – Electrical product produced – Welding electrode
Patent
1988-12-21
1990-05-01
Bell, Janyce
Coating processes
Electrical product produced
Welding electrode
427 64, 427 68, B05D 312
Patent
active
049217275
ABSTRACT:
A method of surface-treating dry-powdered phosphor particles to control the triboelectric charge characteristics thereof includes the steps of providing the phosphor particles with a first coating of silica, dissolving a coupling agent selected from the group consisting of silanes and titanates in a suitable solvent to form a mixture, surface-coating the silica-coated phosphor particles with the mixture to provide a second coating of the coupling agent on the phosphor particles, filtering the surface-treated particles, rinsing the surface-treated particles with the solvent, and drying the surface-treated particles. The resultant dry-powdered surface-treated phosphor particles are used to make a luminescent viewing screen for a CRT. The coupling agent overlying the silica coating controls the triboelectric charging characteristics of the phosphor particles during the electrophotographic manufacturing of the screen.
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Datta Pabitra
Friel Ronald N.
Bell Janyce
Coughlin Jr. Vincent J.
Irlbeck Dennis H.
RCA Licensing Corporation
Whitacre Eugene M.
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