Stable, chemically-strengthenable lithium aluminosilicate glasse

Details Stable, chemically-strengthenable lithium aluminosilicate glasse Stable, chemically-strengthenable lithium aluminosilicate glasse

1979-11-05

1981-03-10

Vertiz, O. R.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 47Q, 428410, C03C 310, C03C 330, C03C 2100

Patent

active

042551994

ABSTRACT:
This invention is concerned with the production of glasses in the Li.sub.2 O-PbO-Al.sub.2 O.sub.3 -SiO.sub.2 system which resist the development of devitrification at temperatures approaching the softening point of the glass, which resist surface wrinkling, haze, devitrification, spalling, and cracking when held for several hours at temperatures above the annealing point of the glass but below the softening point thereof, which can be chemically strengthened to demonstrate modulus of rupture values in excess of 60,000 psi, which display excellent chemical durability, and which, in the most preferred embodiment, exhibit a refractive index of 1.523. Such glasses consist essentially, expressed in terms of weight percent on the oxide basis as calculated from the batch, of

REFERENCES:
patent: 3615320 (1971-10-01), Junge et al.
patent: 3790430 (1974-02-01), Mochel
patent: 4156755 (1979-05-01), Rinehart
patent: 4177319 (1979-12-01), Jahn

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