Glass for press molding
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United States of America Patent
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Mar 11, 2008
Grant Date -
Feb 15, 2007
app pub date -
Sep 7, 2004
filing date -
Sep 17, 2003
priority date (Note) -
Expired
status (Latency Note)
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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 SiO.sub.2, 18% to 27% by weight of B.sub.2O.sub.3, 16% to 25% by weight of Al.sub.2O.sub.3, 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 Li.sub.2O, no more than 3% by weight of K.sub.2O, and no more than 2% by weight of Na.sub.2O; wherein the glass has a deformation temperature of 520.degree. 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.
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