Seasonal solar control composite

Patent metadata

Field	Value
Publication number	US-10792894-B2
Application number	US-201615766573-A
Country	US
Kind code	B2
Filing date	Oct 13, 2016
Priority date	Oct 15, 2015
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

Abstract

A solar control composite has improved seasonal selectivity, allowing a greater amount of heat to be transmitted through the composite during the winter and a lower amount of heat transmitted through the composite during the summer.

First claim

What is claimed is:

1. A composite comprising:
a. a substrate;
b. a solar control layer; and
c. a planarization layer;
d. wherein the substrate has a textured surface comprising a repeating pattern including a valley, a peak, a first sidewall extending at a first angle, and a second sidewall extending at a second angle and meeting the first sidewall at the peak,
e. wherein the solar control layer is deposited on the first sidewall,
f. wherein the solar control layer is discontinuous, and
g. wherein the planarization layer is adjacent the solar control layer and the substrate.

2. The composite of claim 1 , wherein the substrate comprises polyester.

3. The composite of claim 1 , wherein the first angle is in a range of 20 degrees to 45 degrees.

4. The composite of claim 1 , wherein the second angle is in a range of 45 degrees to 100 degrees.

5. The composite of claim 1 , wherein the first sidewall is longer than the second sidewall.

6. The composite of claim 1 , wherein the substrate has a valley depth D V of no greater than 50 microns.

7. The composite of claim 1 , wherein the substrate has a valley width W V of no greater than 90 microns.

8. The composite of claim 1 , wherein a ratio of length of the first sidewall to the length of the second sidewall is at least 0.2.

9. The composite of claim 1 , wherein the solar control layer comprises at least one silver-based layer.

10. The composite of claim 1 , wherein the solar control layer comprises at least one metal oxide layer.

11. The composite of claim 1 , wherein the planarization layer has an average thickness over the peaks of the textured substrate of no greater than 7 microns.

12. The composite of claim 1 , wherein the planarization layer has a refractive index of at least 1.4.

13. The composite of claim 1 , wherein the substrate has a refractive index and the planarization layer has a refractive index, and wherein the difference between the refractive index of the substrate and the refractive index of the planarization layer is no greater than 10%.

14. The composite of claim 1 , wherein the composite has a seasonal selectivity (Se) of at least 0.24, wherein seasonal selectivity is determined according to the formula:

[

TE
⁡

(

30
⁢
°

)

+

TE
⁡

(

35
⁢
°

)

+

TE
⁡

(

40
⁢
°

)

]

-

[

TE
⁡

(

60
⁢
°

)

+

TE
⁡

(

65
⁢
°

)

+

TE
⁡

(

70
⁢
°

)

]

[

TE
⁡

(

30
⁢
°

)

+

TE
⁡

(

35
⁢
°

)

+

TE
⁡

(

40
⁢
°

)

]

,

wherein TE(Θ) represents energetic transmission, i.e. the transmission spectrum integrated over the solar spectrum, at solar incidence angle Θ.

15. A method of forming a seasonal solar control composite, the method comprising:
a. providing a substrate having a first generally planar surface and a second surface;
b. forming a textured surface on the second surface of the substrate, wherein the textured surface comprises a repeating pattern of peaks and valleys connected to each other by a first sidewall and a second sidewall;
c. preferentially depositing a solar control layer on the first sidewall;
d. applying a planarization layer to the substrate thereby forming a composite having generally planar outer surfaces.

16. The method of claim 15 , wherein the substrate comprises polyester.

17. The method of claim 15 , wherein the solar control layer comprises at least one silver-based layer.

18. The method of claim 15 , wherein the solar control layer comprises at least one metal oxide layer.

19. The method of claim 15 , wherein the planarization layer has a refractive index of at least 1.4.

20. The method of claim 15 , wherein the substrate has a refractive index and the planarization layer has a refractive index, and wherein the difference between the refractive index of the substrate and the refractive index of the planarization layer is

Assignees

• Saint Gobain Performance Plastics Corp

Inventors

• Mazoyer Simon
• Lienhart Fabien

Classifications

• B32B27/36 Primary

  comprising polyesters · CPC title

• B32B27/08

  of synthetic resin · CPC title

• B32B2419/00

  Buildings or parts thereof · CPC title

• B32B2551/00

  Optical elements · CPC title

• B32B15/08 Primary

  of synthetic resin · CPC title