US 12,356,731 B2
Polypropylene composition for producing a layer of a photovoltaic module
Tanja Piel, Linz (AT); Bernt-Ake Sultan, Stenungsund (SE); Martina Sandholzer, Linz (AT); and Klaus Bernreitner, Linz (AT)
Assigned to BOREALIS AG, Vienna (AT)
Appl. No. 15/308,202
Filed by BOREALIS AG, Vienna (AT)
PCT Filed May 11, 2015, PCT No. PCT/EP2015/060323
§ 371(c)(1), (2) Date Nov. 1, 2016,
PCT Pub. No. WO2015/173175, PCT Pub. Date Nov. 19, 2015.
Claims priority of application No. 14167926 (EP), filed on May 12, 2014.
Prior Publication US 2017/0077333 A1, Mar. 16, 2017
Int. Cl. H10F 77/50 (2025.01); B32B 9/04 (2006.01); B32B 15/08 (2006.01); B32B 27/08 (2006.01); B32B 27/32 (2006.01); C08L 23/12 (2006.01); C08L 23/14 (2006.01); C09J 123/12 (2006.01); H10F 19/80 (2025.01); H10F 19/85 (2025.01)
CPC H10F 19/804 (2025.01) [B32B 9/045 (2013.01); B32B 15/08 (2013.01); B32B 27/08 (2013.01); B32B 27/32 (2013.01); B32B 27/322 (2013.01); C08L 23/12 (2013.01); C08L 23/142 (2013.01); C09J 123/12 (2013.01); H10F 19/85 (2025.01); H10F 77/50 (2025.01); B32B 2307/546 (2013.01); B32B 2457/12 (2013.01); C08L 2205/02 (2013.01); C08L 2207/02 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A photovoltaic module comprising a protective top element comprising a glass front sheet, a front encapsulant, at least one photovoltaic element, a rear encapsulant, and a multilayer backsheet element comprising at least one layer comprising a polypropylene composition and an adhesive layer for improving the adhesion of the backsheet element to the rear encapsulant layer element,
wherein the polypropylene composition comprises a heterophasic copolymer of propylene (A) which comprises,
a polypropylene matrix component and
an elastomeric propylene copolymer component which is dispersed in said polypropylene matrix,
and wherein the polypropylene composition has
a xylene cold soluble (XCS) fraction in amount of 2 to 30 wt %, when measured according to ISO 16152 (at 25° C.),
a melt flow rate, MFR2, of 0.2 to 20.0 g/10 min (ISO 1133, 2.16 kg load, 230° C.), and
a Vicat softening temperature of at least 145° C., when measured according to ASTM D 1525 method A,
wherein the heterophasic copolymer of propylene (A) has xylene cold soluble (XCS) fraction in amount of 2 to 30 wt % and Vicat softening temperature of at least 145° C., and the adhesive layer comprises (a) a blend of the heterophasic copolymer of propylene (A) and a polypropylene comprising polar groups, or (b) the heterophasic copolymer of propylene (A) grafted with polar groups, and
wherein the thickness of the multi-layer backsheet element is 0.3 to 2 mm.