Granted Patent B2

US 12,356,731 · App. 15/308,202 · Granted Jul 8, 2025

Inventors: Tanja Piel (Linz, AT); Bernt-Ake Sultan (Stenungsund, SE); Martina Sandholzer (Linz, AT); Klaus Bernreitner (Linz, AT)

Assignee: BOREALIS AG

H10F19/804B32B9/045B32B15/08B32B27/08B32B27/32B32B27/322C08L23/12C08L23/142C09J123/12H10F19/85H10F77/50B32B2307/546B32B2457/12C08L2205/02C08L2207/02

Abstract

Claims (21)

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, MFR 2 , 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.

2. The photovoltaic module according to claim 1 , wherein the polypropylene composition has a flexural modulus of at least 900 MPa, when measured according to ISO178.

3. The photovoltaic module according to claim 1 , wherein the polypropylene composition has melting temperature of 158 to 170° C.

4. The photovoltaic module according to claim 1 , wherein the heterophasic copolymer of propylene (A) has a comonomer content of 0.5 to 20 wt %, whereby the comonomer is selected from ethylene and C4-C8 alpha comonomer(s).

5. The photovoltaic module according to claim 1 , wherein the polypropylene composition has a MFR 2 of 0.2 to 10.0 g/10 min.

6. The photovoltaic module according to claim 1 , wherein the polypropylene matrix component of the heterophasic copolymer of propylene (A) is a homopolymer or random copolymer of propylene.

7. The photovoltaic module according to claim 1 , wherein the at least one layer comprising the polypropylene composition is a laminated layer of the multilayer backsheet element.

8. The photovoltaic module according to claim 1 , wherein the at least one layer comprising the polypropylene composition is a coextruded layer of the multilayer backsheet element.

9. The photovoltaic module according to claim 1 , wherein layers of the multilayer backsheet element of the photovoltaic module are free from fluoride containing polymer.

10. The photovoltaic module according to claim 1 , wherein the least one photovoltaic element is at least one element of photovoltaic cell(s).

11. The photovoltaic module according to claim 1 , wherein the adhesive layer comprises a blend of the heterophasic copolymer of propylene (A) and a polypropylene grafted with maleic anhydride.

12. The photovoltaic module according to claim 1 , wherein the adhesive layer comprises the heterophasic copolymer of propylene (A) grafted with maleic anhydride.

Assignments (2)

Priority Claims (1)

Continuity (1)

References Cited (88)