Durable solar mirror films

Patent metadata

Field	Value
Publication number	US-2017111007-A1
Application number	US-201615391945-A
Country	US
Kind code	A1
Filing date	Dec 28, 2016
Priority date	May 3, 2012
Publication date	Apr 20, 2017
Grant date	—

Abstract

The present disclosure generally relates to durable solar mirror films, methods of making durable solar mirror films, and constructions including durable solar mirror films. In one embodiment, the present disclosure relates to a solar mirror film comprising: a multilayer optical film layer including having a coefficient of hygroscopic expansion of less than about 30 ppm per percent relative humidity; and a reflective layer having a coefficient of hygroscopic expansion.

First claim

1 . A solar minor film comprising:
a multilayer optical film layer including having a coefficient of hygroscopic expansion of less than about 30 ppm per percent relative humidity; a reflective layer, and a tie layer between the multilayer optical film layer and the reflective layer, wherein the reflective layer is a metal layer, and wherein the tie layer comprises titanium dioxide.

2 . The solar mirror film of claim 1 , wherein the coefficient of hygroscopic expansion of the multilayer optical film layer is between about 25 ppm per percent relative humidity and about 5 ppm per percent relative humidity.

3 . (canceled)

4 . The solar mirror film of claim 1 , wherein the reflective layer comprises at least one of silver, gold, aluminum, copper, nickel, and titanium.

5 . The solar mirror film of claim 1 , wherein the reflective layer has a coefficient of hygroscopic expansion that is between 0 ppm per percent relative humidity and 3 ppm per percent relative humidity.

6 - 8 . (canceled)

9 . The solar mirror film of claim 1 , further comprising: a weatherable layer adjacent to the multilayer optical film layer.

10 . The solar minor film of claim 1 , wherein the multilayer optical film layer exhibits an average radiation reflectivity of at least 90% over a portion of the solar radiation wavelength range from 380 nm to 3,000 nm.

11 . The solar minor film of claim 1 , wherein the coefficient of hygroscopic expansion of the multilayer optical film layer is between about 10 ppm per percent relative humidity and about 25 ppm per percent relative humidity.

12 . The solar minor film of claim 1 , wherein the coefficient of hygroscopic expansion of the multilayer optical film layer is between about 15 ppm per percent relative humidity and about 20 ppm per percent relative humidity.

13 . The solar minor film of claim 1 , further comprising: a compliance layer between the multilayer optical film layer and the reflective layer.

14 . The solar mirror film of claim 13 , wherein the compliance layer comprises butyl acrylate.

15 . The solar minor film of claim 1 , further comprising: a corrosion protective layer adjacent to the reflective layer.

16 . The solar mirror film of claim 15 , wherein the corrosion protective layer comprises at least one of copper and an inert metal alloy.

17 . The solar minor film of claim 1 , further including an adhesive layer adjacent to the reflective layer.

18 . (canceled)

19 . The solar minor film of claim 17 , wherein the adhesive layer is between the reflective layer and a substrate.

20 . The solar minor film of claim 1 , further comprising: a substrate.

21 . The solar minor film of claim 1 , wherein the solar minor film is incorporated into a reflector assembly.

22 . The solar minor film of claim 1 , wherein the solar mirror film includes one or more skin layers including PMMA and PVDF.

23 . The solar minor film of claim 1 , claim 1 , wherein the solar minor film includes one or more optical layers including a blend of PMMA and PVDF.

24 . A concentrated photovoltaic system, comprising the solar mirror film of claim 1 .

25 . (canceled)

Assignees

• 3M Innovative Properties Co

Inventors

• O'Neill Mark B
• Henderson Andrew J
• Hebrink Timothy J
• Katare Rajesh K
• Jing Naiyong
• North Diane
• Peterson Eric M

Classifications

• G02B1/14

  Protective coatings, e.g. hard coatings · CPC title

• B32B37/153

  at least one layer is extruded and immediately laminated while in semi-molten state · CPC title

• B32B2037/246

  Vapour deposition · CPC title

• B32B2038/0092

  Metallizing · CPC title

• F24S23/70

  with reflectors · CPC title