Glass for press molding

Details Glass for press molding Glass for press molding

2004-09-07

2008-03-11

Group, Karl E (Department: 1755)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S079000

Reexamination Certificate

active

07341967

ABSTRACT:
The present invention provides a novel glass material that allows the production of a glass product having both excellent chemical durability and high precision by a press molding method. Specifically, the present invention provides a glass for press molding, comprising 38% to 45% by weight of SiO2, 18% to 27% by weight of B2O3, 16% to 25% by weight of Al2O3, 2% to 12% by weight of ZnO, no more than 3% by weight of MgO, no more than 3% by weight of CaO, no more than 3% by weight of BaO, 13% to 18% by weight of Li2O, no more than 3% by weight of K2O, and no more than 2% by weight of Na2O; wherein the glass has a deformation temperature of 520° C. or lower; and the glass has a water resistance of grade 2 or higher as measured according to the Japanese Optical Glass Industrial Standard method for measuring the chemical durability of an optical glass.

REFERENCES:
patent: 5744409 (1998-04-01), Hashimoto et al.
patent: 7087543 (2006-08-01), Kasuga et al.
patent: 5-193979 (1993-08-01), None
patent: 2003-89543 (2003-03-01), None
patent: 2003-292336 (2003-10-01), None

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