Abstract:
A METHOD FOR PRODUCING A GLARE-REDUCING COATING UPON A SURFACE, FOR INSTANCE THE EXTERNAL GLASS SURFACE OF THE VIEWING WINDOW OF AN EVACUATED AND SEALED CATHODE-RAY TUBE, COMPRISING PREPARING A COATING FORMULATION CONSISTING ESSENTIALLY OF A SILCEOUS POLYMER, AN ORGANIC POLYMER, AND A VOLATILE ORGANIC LIQUID VEHICLE FOR THE POLYMERS, PRODUCING A SPRAY OF DISCRETE DROPLETS OF THE FORMULATION IN A GASEOUS MEDIUM, INTERCEPTING THE SPRAY UPON THE SURFACE TO PRODUCE A LAYER OF DROPLETS THEREON, FLASHING OFF SUBSTANTIALLY ALL OF THE VEHICLE PRESENT IN THE LAYER LEAVING A SUBSTANTIALLY DRY TEXTURED POLYMERIC LAYER ON THE SURFACE, AND THEN BAKING THE DRY LAYER AT ABOUT 100 TO 200*C. UNTIL THE LAYER IS CURED.
Abstract:
A novel optical screen comprises, as its viewing surface, a hard, abrasion-resistant coating having a rough, glare-reducing surface and composed of a lithium silicate material. The screen may be prepared by a novel method comprising: (a) warming the surface of a glass support to about 30* to 100* C., (b) coating the warm surface with an aqueous solution containing about 1 to 10 weight percent of a lithium-stabilized silica sol, (c) drying the coating, and then (d) heating the dry coating at about 150* C. to 450* C.