Glass article protected from coloring by electron rays and metho

Details Glass article protected from coloring by electron rays and metho Glass article protected from coloring by electron rays and metho

1988-01-21

1990-01-30

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 72, C03C 3087

Patent

active

048973718

ABSTRACT:
The instant invention relates to soda-lime-silica glass articles, having a surface which is resistant to coloring by electron rays which is suitable for use as the glass panel of a cathode ray tube. Said glass article being produced by a float process, and said surface having the sodium ions exchanged with lithium and at least one of potassium, rubidium, and cesium ions. In another aspect of the invention a soda-lime-silica glass containing 0.2-1.5% by weight of Li.sub.2 O having the sodium ions in at least one surface exchanged with potassiums is produced, such that the ratio of Na.sub.2 O/(Na.sub.2 O+K.sub.2 O) is 0.2-0.6 for a depth of 0.5 microns from said surface.

REFERENCES:
patent: 3790430 (1974-02-01), Mochel
patent: 4192689 (1980-03-01), Rinehart
patent: 4403043 (1983-09-01), Nakagaqa et al.

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