Polypropylene composition with flame retardant activity

1. A photovoltaic module comprising at least one photovoltaic element and at least one layer element, wherein said layer element comprises at least one layer comprising a polypropylene composition comprising:

(i) 50 to 98.5 wt % of a polymer of propylene (PP), wherein the polymer of propylene (PP) is a heterophasic copolymer of propylene (iPP) which comprises a heterophasic copolymer of propylene (A) which comprises a polypropylene matrix component (a1) and

an elastomeric propylene copolymer component (a2) which is dispersed in said polypropylene matrix (a1);

and wherein the heterophasic copolymer of propylene (A) has a melting temperature (Tm) (DSC) of at least 145° C.; a Vicat softening temperature (Vicat A) of at least 90° C. (according to ASTM D 1525, method A, 50° C./h, 10 N); and a MFR2 of 0.2 to 20.0 g/10 min, when measured according to ISO 1133 (at 230° C. and 2.16 kg load);

(ii) 1 to 18 wt % of a flame retardant product comprising at least 60 wt % of a metal salt of phosphinic acid,

(iii) 1 to 20 wt % of a filler selected from talc or wollastonite,

(iv) 0.2 to 5 wt % of an additive(s) other than the flame retardant product (ii), and

(v) 0 to 30 wt % of a plastomer;

based on the total amount (100 wt %) of the polypropylene composition;

wherein the layer element is a film which has a thickness of 0.02 to 2.00 mm.

2. The photovoltaic module according to claim 1 , wherein the metal salt of phosphinic acid of the flame retardant product (ii) is selected from the group consisting of an aluminum salt of phosphinic acid.

3. The photovoltaic module according to claim 1 , wherein the polypropylene composition comprises,

(i) 60 to 98 wt % of a polymer of propylene (PP),

(ii) 1 to 18 wt % of a flame retardant product comprising a metal salt of phosphinic acid,

(iii) 1 to 20 wt % of a filler,

(iv) 0.2 to 5 wt % of an additive(s) other than the flame retardant product (ii),

(v) 0 to 30 wt % of a plastomer, and

(vi) 0 to 30 wt % further polymer(s) other than (i) or (v);

based on the total amount (100 wt %) of the polypropylene composition.

4. The photovoltaic module according to claim 1 , wherein the polypropylene composition comprises,

(i) 60 to 98 wt % of a polymer of propylene (PP),

(ii) 1 to 18 wt % of a flame retardant product comprising a metal salt of phosphinic acid,

(iii) 1 to 20 wt % of a filler,

(iv) 0.2 to 5 wt % of an additive(s) other than the flame retardant product (ii),

(v) 3 to 30 wt % of a plastomer, and

(vi) 0 to 30 wt % further polymer(s) other than (i) or (v);

based on the total amount (100 wt %) of the polypropylene composition.

5. The photovoltaic module according to claim 1 , wherein the polypropylene composition has one or more, in any order and in any combination of the following properties:

a Vicat softening temperature (Vicat A) of 100 to 200° C., a flexural modulus of 1100 to 3000 MPa,

a coefficient linear thermal expansion (CLTE) of 100 or less μm/m/° C., when measured from an injection moulded sample at temperature range from −30° C. to +80° C. and at heating rate of 1° C./min, and/or

a heat deflection temperature (HDT) of 75° C. or more.

6. The photovoltaic module according to claim 1 , wherein the heterophasic copolymer of propylene (A) has one or more, in any order and in any combination of the following properties:

MFR2 of 0.2 to 15.0 g/10 min when measured according to ISO 1133 (at 230° C. and 2.16 kg load),

a xylene cold soluble (XCS) fraction in amount of 3 to 30 wt %,

a comonomer content of 0.5 to 20 wt %, the comonomer(s) is selected from ethylene and/or C4-C8 alpha olefin comonomers,

a flexural modulus of at least 900 MPa, when measured according to ISO178, and/or

a density of 900 to 910 kg/m3.

7. The photovoltaic module according to claim 1 , wherein the layer element is selected from:

a monolayer element comprising the polypropylene composition, or

a multilayer element wherein at least one layer comprises the polypropylene composition.

8. The photovoltaic module according to claim 1 , wherein the layer element is a film selected from:

a monolayer film comprising the polypropylene composition, or

a multilayer film wherein at least one layer comprises the polypropylene composition.

9. The photovoltaic module according to claim 1 , comprising, in the given order, a protective top layer element, a front encapsulation layer element, at least one photovoltaic layer element, a rear encapsulation layer element, a backsheet layer element and optionally a protective cover, wherein at least one of said layer elements comprises the layer element comprising said polypropylene composition.

10. The photovoltaic module according to claim 1 , wherein the layer element is a backsheet layer element selected from:

a backsheet monolayer element comprising the polypropylene composition, or

a backsheet multilayer element wherein at least one layer comprises the polypropylene composition.