	US 12,234,180 B2
	Glass sheet with high near-IR transmission and very low visible transmission
Michel Bogaerts, Braine-le-Chateau (BE); Yannick Sartenaer, Vedrin (BE); and François Boland, Gembloux (BE)
Assigned to AGC GLASS EUROPE, Louvain-la-neuve (BE)
Appl. No. 17/275,916
Filed by AGC GLASS EUROPE, Louvain-la-neuve (BE)
PCT Filed Aug. 28, 2019, PCT No. PCT/EP2019/072990 § 371(c)(1), (2) Date Mar. 12, 2021, PCT Pub. No. WO2020/057926, PCT Pub. Date Mar. 26, 2020.
Claims priority of application No. 18194808 (EP), filed on Sep. 17, 2018.
Prior Publication US 2021/0309561 A1, Oct. 7, 2021
Int. Cl. C03C 3/085 (2006.01); C03C 3/087 (2006.01); C03C 4/10 (2006.01)

CPC C03C 3/085 (2013.01) [C03C 3/087 (2013.01); C03C 4/10 (2013.01)]

21 Claims

1. A silicate-type glass sheet having a composition comprising, in a content expressed as weight percentages, by total weight of glass:

SiO₂40-78%;

Al₂O₃0-18%;

B₂O₃0-18%;

Na₂O 0-20%;

CaO 0-15%;

MgO 0-10%;

K₂O 0-10%;

BaO 0-5%

total iron (expressed as Fe₂O₃) 0.002-1.1%;

Manganese (expressed as MnO)≥0.005%;

and optionally,

Chromium (expressed as Cr₂O₃) 0-1.3%,

and

wherein

a sum (Fe₂O₃+MnO+Cr₂O₃) of contents of total iron, manganese and chromium, expressed as weight percentages, ≥1%;

a ratio R1 defined as Fe₂O₃*/(49+0.43(Cr₂O₃*−MnO*))<1;

a ratio R2 defined as Fe₂O₃*/(34+0.3(Cr₂O₃*−MnO*))<1; Fe₂O₃*, MnO* and Cr₂O₃* being relative percentages with respect to the sum (Fe₂O₃+MnO+Cr₂O₃), and

the glass sheet has a TLD4 lower than 20%.