Color cathode ray tube phosphors coated by a wetting agent

Claim 1

In a process for increasing the wetting capabilities of phosphors employed in color displaying cathode ray tubes, said tubes having screens formed of a multiplicity of discrete phosphor triads capable of emitting light in the primary colors, said screens having been formed by applying dry phosphor powders to a tacky photoresist, said process comprising the steps of: applying to said dry phosphor powders, before formation of said screens, a coating of a wetting agent selected from the group consisting essentially of alkyl aryl sulfonates, polyalkylene glycol ether, polyethylene oxide and polyethylene glycols so that said wetting agent is non reactive with dichromatic sensitized polyvinyl alcohol within the temperature range of about 20° C. to 480° C. and vaporizable at a temperature about about 60° C. and below 480° C.; by dispensing said dry phosphor powders into a solution containing said wetting agent; mixing said phosphor and solution thoroughly; filtering said phosphor from said solution to leave a wet phosphor cake; drying said wet phosphor cake; and breaking up said dried cake.