US 12,433,039 B2
Photovoltaic module backsheet comprising polyolefin layers
Pieter Gijsman, Echt (NL); Robert Janssen, Echt (NL); Alessandro Gualdi, Echt (NL); Wei Huang, Echt (NL); and Ruofei Zhao, Echt (NL)
Assigned to ENDURANCE SOLAR SOLUTIONS INC., Nashua, NH (US)
Appl. No. 17/778,491
Filed by ENDURANCE SOLAR SOLUTIONS B.V., Geleen (NL)
PCT Filed Nov. 20, 2020, PCT No. PCT/EP2020/082879
§ 371(c)(1), (2) Date May 20, 2022,
PCT Pub. No. WO2021/099569, PCT Pub. Date May 27, 2021.
Prior Publication US 2022/0416104 A1, Dec. 29, 2022
Int. Cl. H10F 19/85 (2025.01); B32B 7/12 (2006.01); B32B 27/08 (2006.01); B32B 27/20 (2006.01); B32B 27/30 (2006.01); B32B 27/36 (2006.01); B32B 37/15 (2006.01); H10F 19/80 (2025.01); H10F 71/00 (2025.01)
CPC H10F 19/85 (2025.01) [B32B 7/12 (2013.01); B32B 27/08 (2013.01); B32B 27/20 (2013.01); B32B 27/308 (2013.01); B32B 27/36 (2013.01); B32B 37/153 (2013.01); H10F 19/804 (2025.01); H10F 71/00 (2025.01); B32B 2250/02 (2013.01); B32B 2250/24 (2013.01); B32B 2260/046 (2013.01); B32B 2264/1022 (2020.08); B32B 2264/502 (2020.08); B32B 2270/00 (2013.01); B32B 2307/71 (2013.01); B32B 2311/18 (2013.01); B32B 2323/04 (2013.01); B32B 2323/10 (2013.01); B32B 2355/00 (2013.01); B32B 2457/12 (2013.01)] 18 Claims
 
1. A photovoltaic module backsheet comprising:
a functional layer located at a first face of the backsheet and adapted to being positioned adjacent photovoltaic cells of a photovoltaic module;
a weather-resistant layer located at a second face of the backsheet opposite the first face and adapted to being exposed to air; and
a connecting layer which connects the functional layer to the weather-resistant layer, wherein
(i) the functional layer comprises a ternary blend which comprises, based on the weight of the functional layer:
(ia) 5 to 30 wt. % of polypropylene,
(ib) at least 50 wt. % of polyethylene, and
(ic) 20 to 40 wt. % of an ethylene methacrylate copolymer; and wherein
(ii) the weather-resistant layer comprises, based on the weight of the weather-resistant layer:
(iia) at least 50 to at most 95 wt. % of polypropylene;
(iib) a UV stabilizer;
(iic) a primary antioxidant which is selected from the group consisting of phenolic antioxidants and aromatic amine antioxidants; and
(iid) a secondary antioxidant which is selected from the group consisting of trivalent phosphorus containing antioxidants and thioether containing antioxidants, wherein
the primary and secondary antioxidants are each present in a wt. % amount such that a ratio of the wt. % of the primary antioxidant to the wt. % of the secondary antioxidant is from 0.1 to 1.0, and wherein
(iii) the connecting layer comprises:
(iiia) at least 50 wt. % to at most 95 wt. % of polyethylene, and
(iiib) a maleic anhydride grafted polyolefin, wherein
the backsheet is free of fluorinated polymers.