Non-glaze coating for a cathode ray tube

Details Non-glaze coating for a cathode ray tube Non-glaze coating for a cathode ray tube

1986-01-13

1987-09-15

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Envelope

427160, 428428, H01J 2988

Patent

active

046942181

ABSTRACT:
A coating for reducing specular reflection on optical glass screens comprises a partially hydrolized metal alkoxide polymer. These alkoxides have the general formula M(OR).sub.4 where M is selected from the group consisting of silicon, titanium and zirconium where R is alkyl with 1 to 6 carbon. The equivalent titanium and/or zirconium oxides is about 15% of total solids by weight. A presently preferred coating mixture is prepared by dissolving tetraethyl orthosilicate in alcohol, at an elevated temperature; gradually adding a mixture of nitric acid and water; gradually adding titanium butoxide and/or zirconium n-propoxide; and, adding and mixing additional water and alcohol. The coating is applied by a method comprising the steps of cleaning the surface of the optical glass screen; preheating the glass screen; coating the solution onto the glass screen; and, baking the glass screen and solution, at a temperature high enough to drive off the solvent and bond the coating mixture to the glass surface.

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