X-RAY-OPAQUE BARIUM-FREE GLASS AND USES THEREOF, ESPECIALLY IN POLYMER-BASED DENTAL COMPOSITIONS
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United States of America Patent
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Issued Date -
Apr 17, 2014
app pub date -
Oct 12, 2012
filing date -
Oct 12, 2012
priority date (Note) -
Abandoned
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Abstract
The X-ray-opaque glass, which is free of BaO and PbO except for at most impurities, has a refractive index nd of from 1.50 to 1.58 and a high X-ray opacity with an aluminium equivalent thickness of at least 300%. The glass is based on a SiO2—Al2O3—SrO—R2O system with additions of La2O3 and ZrO2. The glass has very good chemical resistance and can be used, in particular, as a dental glass or as an optical glass.
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