Method for making polarizing glasses through extrusion

Details Method for making polarizing glasses through extrusion Method for making polarizing glasses through extrusion

1980-04-28

1981-08-04

Fisher, Richard V.

Glass manufacturing

Processes

Forming product or preform from molten glass

65183, 65DIG2, 106DIG6, C03B 1706, C03C 326

Patent

active

042820227

ABSTRACT:
The present invention relates to the preparation of polarizing glasses from silver-containing glasses characterized by the presence of metallic silver particles therein and/or by being photochromic through the inclusion of silver halide particles therein selected from the group of AgCl, AgBr, and AgI. The method contemplates extruding the glass at a temperature between the annealing and softening points of the glass at a sufficiently high applied pressure to elongate the metallic silver and/or silver halide particles to an aspect ratio of at least 2:1 and up to 30:1 and greater. The extrudate is cooled in a manner to prevent the elongated particles from resuming their original shape. Dichroic ratios of up to 5.0 are achievable where the elongated particles exhibit an oblate configuration.

REFERENCES:
patent: 3208860 (1965-09-01), Armistead et al.
patent: 3467513 (1969-09-01), Dockerty
patent: 3548060 (1970-12-01), Suzuki et al.
patent: 3653863 (1972-04-01), Araujo et al.
patent: 3703388 (1972-11-01), Araujo et al.
patent: 3834912 (1974-09-01), Gliemeroth
patent: 3876436 (1975-04-01), Lythgoe
patent: 3957498 (1976-05-01), Reade
patent: 4125405 (1978-11-01), Araujo et al.
patent: 4190451 (1980-02-01), Hares et al.

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