IP Library › Granted Patent US 12,365,616
Granted Patent B2
US 12,365,616 · App. 16/782,130 · Granted Jul 22, 2025

Soda lime silica glass with high visible light transmittance

Inventors: José Guadalupe Cid-Aguilar (Monterrey, MX); David R. Haskins (Gibsonia, PA); Michael J. Buchanan (Cranberry Township, PA)
Assignee: Vitro Flat Glass LLC
C03C3/087C03C1/105C03C4/0092C03C4/02C03C2203/10
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Quick Facts
Patent No.
US 12,365,616
App. No.
16/782,130
Granted
Jul 22, 2025
Kind
B2
Abstract

The present invention provides a glass sheet having soda-lime-silica glass composition with a high visible light transmittance (L tC ) of at least 89% with a dominant wavelength (DW) from about 490 to 505 nanometers and purity (Pe) of no more than 1% for control thickness of 5.66 mm and methods of making the same. The glass composition comprising a low iron raw material, a total iron oxide (Fe 2 O 3 ) of 0.02 to 0.06 wt. %, ferrous (FeO) from 0.006 to 0.02 wt. %, redox (FeO/Fe 2 O 3 ) from about 0.30 to 0.55, Cr 2 O 3 from about 0.3 to 10 ppm, TiO 2 from about 50 to 500 ppm, SnO 2 from about 10 to 500 ppm, and a critical amount from about 0.10 to 0.25 wt. % of SO 3 . The low content of iron oxide is achieved by the partial substitution of regular raw materials by low iron raw materials, with a complete substitution of regular dolomite by a low iron dolomite with a maximum content of 0.020 wt. % Fe 2 O 3 .

Claims (41)

1. A glass composition comprising:

SiO 2

65 to 75

wt. %

Na 2 O

10 to 20

wt. %

K 2 O

0 to 5

wt. %

CaO

5 to 15

wt. %

MgO

2 to 10

wt. %

Al 2 O 3

0 to 5

wt. %

SO 3

0 to 0.5

wt. %

Cr 2 O 3

0.00003 to 0.001

wt. %

Fe 2 O 3

0.02 to 0.07

wt. %

FeO

0.005 to 0.03

wt. %

Redox Ratio ( FeO/Fe 2 O 3 )

0.30 to 0.55

wherein the glass composition comprises between 5 to 20 wt. % of a low iron dolomite where the low iron dolomite has a total iron content, expressed as Fe 2 O 3 content, of less than 0.1 wt. %, and wherein the low iron dolomite has a total CaO content of between 30 and 35 wt. % and an MgO content of between 15 and 25 wt. %.

2. The glass composition of claim 1 , wherein the Fe 2 O 3 is in an amount of 0.021 to 0.053 wt. %, and the redox ratio is in the range of 0.30 to 0.46.

3. The glass composition according to claim 1 , wherein the glass composition further comprises 0.005 to 0.05 wt. % TiO 2 .

4. The glass composition of claim 1 , wherein the glass composition further comprises 0.0025 to 0.05 wt. % SnO 2 .

5. The glass composition of claim 1 , wherein the glass composition can be utilized to produce a glass having a luminous transmittance (L TC ) of at least 85%; an ultraviolet transmittance (T UV ) of less than 90%; an infrared transmittance (T IR ) of less than 90%; a total solar energy transmittance (T SET ) of at most 92%; a lightness value (L*) of 90 to 99; an a* color channel in the range of 1 to −2; a b* color channel of in the range of 1 to −1; a dominant wavelength of 470 to 525 nm; and a purity (Pe) of not more than 2%.

6. The glass composition of claim 1 , wherein the source of iron further comprises one or more low iron materials that are selected from low iron sand, low iron limestone, low iron clear cullet, or a combination thereof.

7. The glass composition of claim 1 , wherein the low iron dolomite has a total iron content, expressed as Fe 2 O 3 content, of less than 0.030 wt. %.

8. The glass composition of claim 1 , wherein the low iron dolomite has a total iron content, expressed as Fe 2 O 3 content, of less than 0.020 wt. %.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 1, 2022
From: CID-AGUILAR, JOSÉ GUADALUPE; HASKINS, DAVID R.; BUCHANAN, MICHAEL J.
To: VITRO FLAT GLASS LLC
Reel/Frame 060683/0238 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 29, 2020
From: CID-AGUILAR, JOSÉ GUADALUPE; HASKINS, DAVID R.; BUCHANAN, MICHAEL J.
To: VITRO FLAT GLASS LLC
Reel/Frame 052526/0436 →
Continuity (1)
Related Publication 20230183124A1 · Jun 15, 2023
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