High-index glasses that absorb UV radiation

PCT No. PCT/US96/16192 Sec. 371 Date Feb. 2, 1998 Sec. 102(e) Date Feb. 2, 1998 PCT Filed Oct. 9, 1996 PCT Pub. No. WO97/14661 PCT Pub. Date Apr. 24, 1997The invention relates to glasses which absorb UV radiation and which have the following composition, in wt. %: SiO2 30-52; ZnO 0-8; B2O3 12-22; Pb...

Full description

Saved in:
Bibliographic Details
Main Author BROCHETON; YVES A. H
Format Patent
LanguageEnglish
Published 03.08.1999
Edition6
Subjects
CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS
CHEMISTRY
GLASS
JOINING GLASS TO GLASS OR OTHER MATERIALS
METALLURGY
MINERAL OR SLAG WOOL
SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS
SURFACE TREATMENT OF GLASS
Online AccessGet full text

Cover

More Information
Summary:PCT No. PCT/US96/16192 Sec. 371 Date Feb. 2, 1998 Sec. 102(e) Date Feb. 2, 1998 PCT Filed Oct. 9, 1996 PCT Pub. No. WO97/14661 PCT Pub. Date Apr. 24, 1997The invention relates to glasses which absorb UV radiation and which have the following composition, in wt. %: SiO2 30-52; ZnO 0-8; B2O3 12-22; PbO 0-2; ZrO2 5-14; Y2O3 0-15; Al2O3 0-12; La2O3 5-25; Li2O 1.5-3.5; TiO2 0-2; Na2O 0-6; HfO2 0-2; K2O 2-9; Nb2O5 0-2; MgO 0-5; Ta2O5 0-2; CaO 0-5; MoO3 0-2; SrO 0-9; WO3 0-2; BaO 0-14; SnO 0-4; Sb2O3 0-4; SnO2 0-4; AS2O3 0-4; CdO 0-1; CuO 0.15-1; F 0-2; Cl 0-3; Br 0-3; I 0-2 with the following conditions: Li2O+Na2O+K2O (X2O) 7-14; MgO+CaO+SrO+BaO (XO) 12-20; ZrO2+Al2O3<15; F+Cl+Br+I 0.2-4.0; TiO2+PbO+Nb2O5</=2; AS2O3+Sb2O3+SnO2+SnO 0.05-4.0 and a ratio R=(M2O+2MO-Al2O3-ZrO2)/B2O3 where M2O and MO represent the total content of alkali metal oxide and the total content of alkaline-earth metal oxides, respectively, expressed in mol. %, between 0.50 and 1.00. Application to the manufacture of ophthalmic lenses, notably.
Bibliography:Application Number: US19980011166