Phosphate glasses for glass molds

Details Phosphate glasses for glass molds Phosphate glasses for glass molds

1990-10-19

1991-06-11

Bell, Mark L.

Compositions: coating or plastic

Coating or plastic compositions

Molds and mold coating compositions

501 48, C03C 317

Patent

active

050229214

ABSTRACT:
This invention is particularly directed to the production of glass molds for use in press molding optically finished lenses. The inventive glass compositions consist essentially, in mole percent, of 34-56% ZnO, 4-14% Al.sub.2 O.sub.3, 40-52% P.sub.2 O.sub.5, and up to 15% total of optional modifying oxides including up to 5% Li.sub.2 O and/or Na.sub.2 O and/or K.sub.2 O, up to 5% Sb.sub.2 O.sub.3, and up to 15% total of CaO and/or SrO and/or BaO.

REFERENCES:
patent: 2381925 (1945-08-01), Pincus
patent: 2400147 (1946-05-01), Hooley
patent: 2434281 (1948-01-01), Moulton
patent: 2577627 (1951-11-01), Pincus
patent: 3979322 (1976-09-01), Alexeev et al.
patent: 4026714 (1977-05-01), Lewis
patent: 4248732 (1981-02-01), Myers et al.
patent: 4439530 (1984-03-01), Tajima
patent: 4874724 (1989-10-01), Beall et al.
patent: 4940677 (1990-07-01), Beall et al.

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