Optical articles prepared from hydrated glasses

Details Optical articles prepared from hydrated glasses Optical articles prepared from hydrated glasses

C - Chemistry, Metallurgy

03

C

261/13, 49/85

C03C 3/04 (2006.01) C03B 11/08 (2006.01) C03B 19/06 (2006.01) C03B 19/12 (2006.01) C03C 3/078 (2006.01) C03C 3/102 (2006.01) C03C 23/00 (2006.01) G02B 1/00 (2006.01)

Patent

CA 1067107

OPTICAL ARTICLES PREPARED FROM HYDRATED GLASSES Abstract of the Disclosure A glass article having an optical quality surface smoothness can be formed by molding a "silanol" glass mate- rial against a die having a molding surface which is a mirror of that required for the glass article, thereby obviating glass grinding and polishing steps. The article is prepared by first forming an anhydrous base glass com- prising, in mole percent on the oxide basis, about 72 to 82% SiO2, 10 to 17% Na2O and/or K2O, and 5 to 15% of an oxide or oxides selected from ZnO and PbO. The base glass may include up to 5% A12O3 and up to 3% of B2O3, BaO and/or MgO. The anhydrous base glass is then hydrated to include a water content ranging from 0.5 to 10% by weight to form a "silanol" glass. That glass is then molded against the die surface at a temperature ranging from about 250°C. to 500°C. and a pressure ranging from about 4,000 to 20,000 psi for a period of time sufficient to replicate the surface smooth- ness of the die on the glass and, depending on the molding process, yield a glass article containing about 0.5 to 10% by weight of "tightly" bound total water. Related Application: U.S. Patent No. 4,026,692, in the name of R. F. Bartholomew et al, entitled "Optical Articles From Acid Hydrated Glasses" and assigned to the present assignee.

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