# US 11,999,651 B2 · Silicoborate and borosilicate glasses having high refractive index and low density

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,999,651 B2
- Document ID: US11999651B2
- Status: Granted
- Kind: B2
- Application number: 17/398,580
- Filed: 2021-08-10
- Published: 2022-03-10
- Granted: 2024-06-04
- Earliest claimed: 2020-09-10
- Assignees: Corning Incorporated
- Applicants: Corning Incorporated
- Inventors: Paulo Jorge Gaspar Marques; Antoine Marie Joseph Lepicard; Jian Luo; Lina Ma; Alexander I. Priven
- Web page: https://patentgrep.com/patent/US11999651B2

## CPC

- C03C 3/068: containing rare earths
- C03C 4/0085: {for UV-transmitting glass}
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS

## Abstract

Glasses containing silicon dioxide (SiO2) and/or boron oxide (B2O3) as glass formers and having a refractive index nd of greater than or equal to 1.7, as measured at 587.56 nm, and a density of less than or equal to 4.5 g/cm3, as measured at 25° C., are provided. Optionally, the glasses may be characterized by a low optical dispersion, a high transmittance in the visible and near-ultraviolet (near-UV) range of the electromagnetic spectrum, and/or good glass forming ability.

## Claims

### Claim 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”.

### Claim 2 (depends on 1)

The glass of claim 1, wherein the SiO2 is from 0.3 wt % to 10.0 wt %.

### Claim 3 (depends on 1)

The glass of claim 1, wherein the B2O3 is from 0.3 wt % to 10.0 wt %.

### Claim 4 (depends on 1)

The glass of claim 1, wherein the Nb2O5 is up to and including 20.0 wt %.

### Claim 5 (depends on 1)

The glass of claim 1, wherein the at least one oxide is ZrO2.

### Claim 6 (depends on 5)

The glass of claim 5, wherein the ZrO2 is from 5.0 wt % to 10.0 wt %.

### Claim 7 (depends on 1)

The glass of claim 1, wherein the at least one oxide is TiO2.

### Claim 8 (depends on 7)

The glass of claim 7, wherein the TiO2 is from 2.0 wt % to 5.0 wt %.

### Claim 9 (depends on 1)

The glass of claim 1, wherein the sum of (Nb2O5+TiO2) is from 18.0 wt % to 30.0 wt %.

### Claim 10 (depends on 1)

The glass of claim 1, wherein the sum of (SiO2+B2O3) is from 15.0 wt % to 30.0 wt %.

### Claim 11 (depends on 1)

The glass of claim 1, wherein the sum of (La2O3+Gd2O3) is from 20.0 wt % to 40.0 wt %.

### Claim 12 (depends on 1)

The glass of claim 1, wherein the ratio (SiO2/(SiO2+B2O3)) is greater than or equal to 0.20 and less than or equal to 0.40.

### Claim 13 (depends on 1)

The glass of claim 1, wherein the ratio (CaO+SrO+BaO)/(Nb2O5+TiO2) is greater than or equal to 0.50.

### Claim 14 (depends on 1)

The glass of claim 1, wherein the glass further has a refractive index nd that is from 1.70 to 1.95, where nd is the refractive index measured at a wavelength of 587.56 nm.

### Claim 15 (depends on 1)

The glass of claim 1, wherein the glass has an Abbe number νd from 25 to 28.

### Claim 16 (depends on 1)

The glass of claim 1, wherein the glass further has a density dRT of 4.5 g/cm3 or less, as measured at 25° C.

### Claim 17 (depends on 1)

The glass of claim 1, wherein the glass is characterized by an ability to cool, in air, from 1100° C. to 500° C. in 2.5 minutes without crystallizing.

### Claim 18 (depends on 1)

The glass of claim 1, wherein the glass further has an Abbe number νd of 33 or less and satisfies formula (VI) and formula (VII):
Pg-F<0.6750−0.0028*νd (VI)
and
−0.005≤Pg-F−(0.6438−0.001682*νd)<0.005 (VII)
where Pg-F is a relative partial dispersion of the glass and is calculated according to formula (II):
Pg-F=(ng−nF)/(nF−nC) (II)
where ng is the refractive index measured at 435.8 nm, nF is the refractive index measured at 486.1 nm, and nC is the refractive index measured at 656.3 nm.

### Claim 19 (depends on 1)

The glass of claim 1, wherein the glass further has a total transmittance of 70% at a wavelength λ70% (in nanometers) based on a relative partial dispersion Pg-F of the glass, according to formula (X):
λ70%≤210+300*Pg-F (X)
where Pg-F is defined according to formula (II):
Pg-F=(ng−nF)/(nF−nC) (II)
where ng is the refractive index measured at 435.8 nm, nF is the refractive index measured at 486.1 nm, and nC is the refractive index measured at 656.3 nm, and total transmittance is measured with a glass sample having a thickness of 10 mm.