US 12,015,094 B2
Sealing material sheet for solar-cell module and solar-cell module using the same
Kosuke Saeki, Tokyo (JP); Shinya Yoneda, Tokyo (JP); Jun Tanaka, Tokyo (JP); Hiroaki Tamaki, Tokyo (JP); Shinsuke Nagino, Tokyo (JP); and Naohiro Obonai, Tokyo (JP)
Assigned to DAI NIPPON PRINTING CO., LTD., Tokyo (JP)
Filed by DAI NIPPON PRINTING CO., LTD., Tokyo (JP)
Filed on Oct. 3, 2022, as Appl. No. 17/958,948.
Application 17/958,948 is a continuation of application No. 16/381,478, filed on Apr. 11, 2019, abandoned.
Prior Publication US 2023/0099082 A1, Mar. 30, 2023
Int. Cl. H01L 31/044 (2014.01); B32B 27/08 (2006.01); B32B 27/32 (2006.01); B32B 37/15 (2006.01); H01L 31/048 (2014.01); H01L 31/049 (2014.01)
CPC H01L 31/0481 (2013.01) [B32B 27/08 (2013.01); B32B 27/32 (2013.01); B32B 37/153 (2013.01); H01L 31/0488 (2013.01); H01L 31/049 (2014.12); B32B 2307/72 (2013.01); B32B 2457/12 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A sealing material sheet for a solar-cell module,
the sealing material sheet being a multi-layer sheet comprising:
a core layer composed of a polyethylene-based resin as a base resin, and
skin layers, which are laminated directly on both sides of the core layer and disposed on both outermost surfaces of the core layer and are composed of a polyethylene-based resin as a base resin,
wherein:
the multi-layer sheet has a total thickness of 250 μm or more and 600 μm or less,
the core layer has a thickness of 200 μm or more and 400 μm or less and has a density that is in a range of from 0.880 g/cm3 to 0.930 g/cm3 and a melting point of 70° C. or higher;
the skin layers have a thickness of 30 μm or more and 100 μm or less and have a density that is in a range of from 0.880 g/cm3 to 0.910 g/cm3 and a melting point of 90° C. or lower;
the core layer and the skin layers contain a silane-modified polyethylene-based resin, a weight average molecular weight of the silane-modified polyethylene-based resin present in the core layer and the skin layers in terms of polystyrene is 70000 or more;
a polymerized silane amount of the core layer with respect to a total amount of all resin components is in a range of from 30 ppm to 2000 ppm;
a polymerized silane amount of the skin layers with respect to a total amount of all resin components is in a range of from 300 ppm to 2000 ppm;
a melt mass flow rate of the sealing material sheet is 3.0 g/10 min or more and less than 3.8 g/10 min in terms of average of the whole layer;
a tensile shear adhesion strength measured by a tensile shear adhesion strength measurement experiment is at least 1000 N; and
the tensile shear adhesion strength measurement experiment measures the tensile shear adhesion strength by a test method according to JIS K7197 at a tensile rate of 1.27 mm/min, after preparing an evaluation sample using two colorless strengthened glass plates having a flat surface, placing a sealing material sheet cut to 2.5 cm×1.27 cm between the two glass plates, and performing a vacuum heating lamination treatment at a set temperature of 150° C. under a vacuum aspiration for 3 minutes and an atmospheric pressurization of 7 minutes.