US 11,999,651 B2
Silicoborate and borosilicate glasses having high refractive index and low density
Paulo Jorge Gaspar Marques, Herblay sur Seine (FR); Antoine Marie Joseph Lepicard, Melun (FR); Jian Luo, Painted Post, NY (US); Lina Ma, Corning, NY (US); and Alexander I. Priven, Chungchongnam-do (KR)
Assigned to Corning Incorporated, Corning, NY (US)
Filed by CORNING INCORPORATED, Corning, NY (US)
Filed on Aug. 10, 2021, as Appl. No. 17/398,580.
Claims priority of provisional application 63/076,540, filed on Sep. 10, 2020.
Prior Publication US 2022/0073409 A1, Mar. 10, 2022
Int. Cl. C03C 3/068 (2006.01)
CPC C03C 3/068 (2013.01) 19 Claims
 
1. A glass, comprising:
SiO2 from 0.3 wt % to 30.0 wt %;
B2O3 from 0.3 wt % to 30.0 wt %;
Nb2O5 from 11.23 wt % to 50.0 wt %;
CaO from 0.5 wt % to 25.0 wt %;
at least one oxide selected from ZrO2, SrO, Li2O, MgO, ZnO, Y2O3, Ta2O5, BaO, PbO, TiO2, Gd2O3, GeO2, K2O, La2O3, and Na2O, subject to the proviso that:
ZrO2 from 2.5 wt % to 15.0 wt %, if present;
Gd2O3 from 0.0 wt % to 20.0 wt %;
Y2O3 from 0.0 wt % to 10.0 wt %;
TiO2 from 0.0 wt % to 6.77 wt %;
ZnO from 0.0 wt % to 2.0 wt %;
Li2O from 0.0 wt % to 2.0 wt %;
GeO2 from 0.0 wt % to 2.0 wt %;
Ta2O5 from 0.0 wt % to 1.0 wt %; and
wherein the glass is further defined by (in percent by weight of oxides):
a sum of (Nb2O5+TiO2) of from 18.0 wt % to 50.0 wt %;
a sum of (SiO2+B2O3) of from 1.0 wt % to 30.0 wt %;
a sum (La2O3+Gd2O3) of from 0.0 wt % to 40.0 wt %;
a sum (CaO+SrO+BaO) of 8.1 wt % or greater;
a sum (PbO+V2O5) of from 0.0 wt % to 1.0 wt %;
a ratio CaO/(Li2O+Na2O+K2O+MgO+CaO+SrO+BaO+ZnO) of 0.50 or greater;
a ratio (SiO2/(SiO2+B2O3)) of greater than 0.0 to less than or equal to 0.50; and
a ratio (CaO+SrO+BaO)/(Nb2O5+TiO2) of 0.45 or greater, and
wherein the glass is substantially free of fluorine; and
wherein none of the ranges is modified by the term “about”.