C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
261/14
C03C 3/12 (2006.01) C03C 3/30 (1980.01)
Patent
CA 1098132
ABSTRACT The present invention provides compositions of glass elements having refractive indexes of over 2.10 comprising the following metal oxides by weight percent; 40.0 to 54.0% of TiO2, 24.0 to 44.0% of BaO, 5.0 to 15.0% of ZnO, 3.0 to 13.0% of ZrO2, 0.2 to 3.0% of CaO, 0.2 to 3.0% of MgO, 0.2 to 2.0% of SiO2, 0.1 to 0.5% of Na2O and/or K2O, and, the total weight exceeding 98.0% and the total weight of oxides being 100.0% with the remainder comprising incidental ingredients and/or impurities. The glass of this invention has a refractive index of over 2.10 which makes it suitable for glass beads used in reflex-reflective sheet, it does not contain harmful ingredients such as PbO, CdO, etc. or Bi2O3. Further, the glass can be readily produced by the conventional methods without the various considerations and care that would be required during manufacture, if such constituents were used. The glass is stable and therefore can be used as transparent glass.
304823
Borden Ladner Gervais Llp
Fukuoka Tokushugarasu Kabushiki Kaisha
Seibu Polymer Kasei Kabushiki Kaisha
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