Glass composition suitable for use in a fluorescent lamp, tube a

Details Glass composition suitable for use in a fluorescent lamp, tube a Glass composition suitable for use in a fluorescent lamp, tube a

1984-12-14

1987-05-19

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 70, 501 64, 501 61, 501 62, 501 75, 501 77, 501 78, 313636, 313493, G03C 310

Patent

active

046668713

ABSTRACT:
A new type of glass, for example for use as a TL-envelope glass which as regards phosphor poisoning and Hg penetration has better properties than the present TL-envelope glasses. Phosphor poisoning occurs in particular upon fusing electrodes and bending and severing and bridging, respectively, during the manufacture of SL and PL lamps.
Phosphor poisoning is controlled by incorporating little or no Na.sub.2 O in the glass. In order to nevertheless reach good processing properties, a combination of Li.sub.2 O and K.sub.2 O is used in the glass. The addition of only Li.sub.2 O or only K.sub.2 O does not result in a suitable glass.
Hg penetration is controlled by the presence of a large quantity of alkaline earth metal oxides in the glass.
The glass according to the invention has a good light transmission. A lamp comprising a lamp envelope of a glass according to the invention shows only a small luminous decline during operation of the lamp.

REFERENCES:
patent: 3563772 (1971-02-01), Joormann et al.
patent: 3858964 (1975-01-01), Piesslinger et al.
patent: 4036654 (1977-07-01), Yale et al.
patent: 4179300 (1979-12-01), Sagara
patent: 4390638 (1983-06-01), Mennemann et al.
patent: 4459510 (1984-07-01), Joormann
patent: 4520115 (1985-05-01), Speit et al.
Chem. Abstract 94: 144244w "Glass Suitable for Glass Beads", Jpn. Kobai Tokkyo Koho, 80,126,547, 9-80.
Chem. Abstract 89: 29553f "Glass Compositions Useful As Dielectric Substance", Japan Kokai, 70,05215, 1-78.

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