# US 11,299,018 B2 · Window assembly

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- Number: US 11,299,018 B2
- Document ID: US11299018B2
- Status: Granted
- Kind: B2
- Application number: 16/632,887
- Filed: 2018-07-27
- Published: 2020-05-21
- Granted: 2022-04-12
- Earliest claimed: 2017-07-28
- Assignees: Pilkington Group Limited
- Applicants: Pilkington Group Limited
- Inventors: Srikanth Varanasi; Martin James Horsley; James Eckhart
- Web page: https://patentgrep.com/patent/US11299018B2

## CPC

- B60J 3/007: {Sunglare reduction by coatings, interposed foils in laminar windows, or permanent screens (layered glass products B32B17/00; process of coating windows C03C17/00)}
- C03C 21/002: {to perform ion-exchange between alkali ions (C03C21/005 takes precedence)}
- B32B 7/02: Physical, chemical or physicochemical properties
- B32B 17/10036: {comprising two outer glass sheets}
- B32B 17/1011: {having predetermined tint or excitation purity}
- B32B 17/10119: {having a composition deviating from the basic composition of soda-lime glass, e.g. borosilicate}
- B32B 17/10137: {Chemical strengthening}
- B32B 17/10155: {Edge treatment or chamfering}
- B32B 17/10339: {Specific parts of the laminated safety glass or glazing being colored or tinted (tinted glass sheet B32B17/1011; tinted interlayer B32B17/10651)}
- B32B 17/10761: {containing vinyl acetal}
- B60J 1/001: {Double glazing for vehicles}
- C03C 3/087: containing calcium oxide, e.g. common sheet or container glass
- C03C 4/02: for coloured glass
- E06B 3/6608: {without separate spacing elements (E06B3/6707 and E06B3/6715 take precedence)}
- E06B 3/6715: {specially adapted for increased thermal insulation or for controlled passage of light (E06B3/66323 takes precedence; coating of glass pains C03C17/00; devices or arrangements for controlling the intensity, colour, phase, polarisation or direction of light G02F1/00)}
- E06B 9/24: Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; {Slat blinds}(operating, guiding or securing devices or arrangements for roll-type closures E06B9/56; free-hanging flexible screens A47H23/00)
- B32B 2307/102: Insulating
- E06B 2009/2417: {Light path control; means to control reflection}
- B60J: WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES (fastening, suspending, closing, or opening of such devices E05)
- 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
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- E06B: FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES (shades or blinds for greenhouses A01G9/22; curtains A47H; lids for car boots or bonnets B62D25/10; skylights E04B7/18; sunshades, awnings E04F10/00)

## Abstract

A window assembly includes a first pane of glass. The first pane of glass is chemically strengthened and exhibits a surface compressive stress of 400 MPa or more. A second pane of glass has a first major surface and a second major surface. The second major surface of the second pane of glass and a first major surface of the first pane of glass face each other. The second pane of glass includes 68-74 weight % SiO2, 2-6 weight % MgO, 1-10 weight % CaO, 12-16 weight % Na2O, 0-1 weight % K2O, 0.8-2.0 weight % Fe2O3 (total iron), 0-1.25 weight % TiO2, and 0-1.25 weight % CeO2. A polymeric interlayer is provided between the first pane of glass and the second pane of glass. The window assembly exhibits a direct solar transmittance of 55% or less and a total solar transmittance of 65% or less.

## Claims

### Claim 1

A window assembly, comprising:
a first pane of glass, the first pane of glass being chemically strengthened and exhibiting a surface compressive stress of 400 MPa or more and 800 MPa or less, and having a compressive stress layer with a depth of 15 to 40 microns, the first pane of glass comprising 66-72 weight % SiO2, 8-15 weight % MgO, 1-8 weight % CaO, 12-16 weight % Na2O, 0-1 weight % K2O, and 1.0-5.0 weight % Al2O3;
a second pane of glass having a first major surface and a second major surface, wherein the second major surface of the second pane of glass and a first major surface of the first pane of glass face each other, the second pane of glass comprising 68-74 weight % SiO2, 2-6 weight % MgO, 1-10 weight % CaO, 12-16 weight % Na2O, 0-1 weight % K2O, 0.8-2.0 weight % Fe2O3 (total iron), 0-1.25 weight % TiO2, and 0-1.25 weight % CeO2;
a polymeric interlayer provided between the first pane of glass and the second pane of glass,
wherein the window assembly exhibits a direct solar transmittance, integrated over the wavelength range 300 to 2500 nm according to the relative solar spectral distribution for air mass 1.5, of 55% or less and a total solar transmittance, integrated over the wavelength range 300 to 2500 nm according to the relative solar spectral distribution for air mass 1.5, of 65% or less.

### Claim 2 (depends on 1)

The window assembly of claim 1, wherein the window assembly exhibits a total visible light transmittance (Illuminant A, two degree observer) of 70% or more as measured from a side facing the first pane of glass.

### Claim 3 (depends on 1)

The window assembly of claim 1, wherein the transmitted color (Illuminant D65, ten degree observer) exhibited by the window assembly is of a green-yellow color.

### Claim 4 (depends on 1)

The window assembly of claim 1, wherein the transmitted color (Illuminant D65, ten degree observer) exhibited by the window assembly has an a* value of −12 to −5 and a b* value of 0 to 6.

### Claim 5 (depends on 1)

The window assembly of claim 1, wherein the second pane of glass comprises 0.8-1.9 weight % Fe2O3 (total iron), or 0.9-1.9 weight % Fe2O3 (total iron) or 0.9-1.4 weight % Fe2O3 (total iron).

### Claim 6 (depends on 1)

The window assembly of claim 1, wherein the thickness of the second pane of glass is greater than the thickness of the first pane of glass.

### Claim 7 (depends on 6)

The window assembly of claim 6, wherein the thickness of the second pane of glass is at least 1.5 times greater than the thickness of the first pane of glass.

### Claim 8 (depends on 1)

The window assembly of claim 1, wherein the thickness of the second pane of glass is 4 mm or less and the thickness of the first pane of glass is 2 mm or less.

### Claim 9 (depends on 1)

The window assembly of claim 1, wherein the second pane of glass comprises 0.01-0.3 weight % TiO2 and/or wherein the second pane of glass is substantially Co3O4 free.

### Claim 10 (depends on 1)

The window assembly of claim 1, wherein the weight % of Al2O3 in the second pane of glass is less than the weight % of Al2O3 in the first pane of glass and/or wherein the second pane of glass comprises 0-2 weight % Al2O3.

### Claim 11 (depends on 1)

The window assembly of claim 1, wherein the first pane of glass comprises 4.0-5.0 weight % Al2O3.

### Claim 12 (depends on 1)

The window assembly of claim 1, wherein the first pane of glass exhibits a surface compressive stress of 450 MPa or more.

### Claim 13 (depends on 12)

The window assembly of claim 12, wherein the first pane of glass exhibits a surface compressive stress of 600 MPa or more.

### Claim 14 (depends on 1)

The window assembly of claim 1, wherein the first pane of glass is an inner pane of glass and the second pane of glass is an outer pane of glass.

### Claim 15 (depends on 1)

The window assembly of claim 1, wherein the first pane of glass is a sheet of float glass and the second pane of glass is a sheet of float glass.

### Claim 16 (depends on 1)

The window assembly of claim 1, wherein the window assembly exhibits a direct solar transmittance of 52% or less and a total solar transmittance of 62% or less.

### Claim 17 (depends on 1)

The window assembly of claim 1, wherein the window assembly exhibits a direct solar transmittance of 40-55% and/or wherein the window assembly exhibits a total solar transmittance of 55-65%.

### Claim 18 (depends on 1)

The window assembly of claim 1, wherein the window assembly has a thickness of less than 5.0 mm.

### Claim 19

A window assembly, comprising:
a first pane of glass, the first pane of glass being chemically strengthened and exhibiting a surface compressive stress of 400 MPa or more and 800 MPa or less, and having a compressive stress layer with a depth of 15 to 40 microns, the first pane of glass comprising 58-70 weight % SiO2, 4-10 weight % MgO, 0-1 weight % CaO, 12-18 weight % Na2O, 0.1-5 weight % K2O, and 5-15 weight % Al2O3;
a second pane of glass having a first major surface and a second major surface, wherein the second major surface of the second pane of glass and a first major surface of the first pane of glass face each other, the second pane of glass comprising 68-74 weight % SiO2, 2-6 weight % MgO, 1-10 weight % CaO, 12-16 weight % Na2O, 0-1 weight % K2O, 0.8-2.0 weight % Fe2O3 (total iron), 0-1.25 weight % TiO2, and 0-1.25 weight % CeO2;
a polymeric interlayer provided between the first pane of glass and the second pane of glass,
wherein the window assembly exhibits a direct solar transmittance, integrated over the wavelength range 300 to 2500 nm according to the relative solar spectral distribution for air mass 1.5, of 55% or less and a total solar transmittance, integrated over the wavelength range 300 to 2500 nm according to the relative solar spectral distribution for air mass 1.5, of 65% or less.