Organic lens molds in inorganic glass and novel inorganic glasses
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United States of America Patent
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Aug 20, 2002
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N/A
app pub date -
Jan 4, 2000
filing date -
May 7, 1997
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Expired
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Abstract
The principal object of the present invention is organic lens molds, constituted wholly or in part of at least one specific inorganic glass, advantageously strengthened by a chemical tempering or a thermal tempering. Said glass has the following composition, expressed in percentages by weight: SiO.sub.2 56-66, Al.sub.2 O.sub.3 2.5-10, B.sub.2 O.sub.3 0.5-7, Li.sub.2 O 0-3, Na.sub.2 O 8-15, K.sub.2 O 3-12, with Li.sub.2 O+Na.sub.2 O+K.sub.2 O 12-20, ZnO 2-12, MgO 0-3, TiO.sub.2 0-0.5, ZrO.sub.2 1-9, CaO 0-1, BaO 0-2, SrO 0-2, with MgO+CaO+SrO+BaO 0-5, Cl 0-0.5, As.sub.2 O.sub.3 +sb.sub.2 O.sub.3 0-1. The invention also deals with novel inorganic glasses which have the above composition with a single exception relative to the Al.sub.2 O.sub.3 content: Al.sub.2 O.sub.3 2.5-4.
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