Process for producing glass product having gradient of refractiv

Details Process for producing glass product having gradient of refractiv Process for producing glass product having gradient of refractiv

1983-04-26

1985-06-25

Smith, William

Glass manufacturing

Processes

Forming product or preform from molten glass

65 31, C03C 1502

Patent

active

045251894

ABSTRACT:
A process for producing a glass product having .DELTA.n, the difference between the central and peripheral portions of the glass, greater than 0.04. This process utilizes a porous glass body which is produced via a phase separation technique. A dopant selected from the group consisting of (1) TlNO.sub.3, (2) TlNO.sub.3 and an alkali metal compound and (3) TlNO.sub.3, Pb(NO.sub.3).sub.2 and an alkali metal compound is then permeated into the micropores of the porous glass product. A concentration gradient of the dopant is then formed by leaching out a portion of the dopant from the micropores. After the dopant is solidified in the micropores, the porous glass product is dried. A heat-treatment step then serves to collapse the micropores. A glass product having a gradient of refractive indices is thereby obtained.

REFERENCES:
patent: 3938974 (1976-02-01), Macedo et al.
patent: 4110093 (1978-08-01), Macedo et al.
patent: 4110096 (1978-08-01), Macedo et al.
patent: 4225330 (1980-09-01), Kakuzen et al.
patent: 4389233 (1983-06-01), Kurosaki et al.

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