Polymer compositions and extrusion coated articles

1. A polymer composition (A) comprising a blend of

i) 60 to 90 wt-% of propylene polymer composition (a) comprising a blend of

(a-1) 55 to 95 wt-% of propylene polymer and

(a-2) 5 to 45 wt-% of low density ethylene polymer (LDPE) which is a high pressure polyethylene,

where the amounts of (a-1) and (a-2) are based on the total weight of composition (a), and composition (a) has a melt flow rate MFR 2 of from 10 to 50 g/10 min (230° C./2.16 kg) and the Vicat softening temperature in the range of 120 to 155° C. measured according to ISO 306,

and

ii) 10 to 40 wt-% of a plastomer (b) of ethylene copolymer with at least one α-olefin comonomer of 4 to 10 C-atoms, provided that at least one comonomer is a monomer with at least 6 C-atoms

where the amounts of (i) and (ii) are based on the total weight of the composition (A), and

wherein the plastomer b) has a density of 880 to 912 kg/m 3 .

2. The polymer composition (A) according to claim 1 , wherein the plastomer (b) is an ethylene-C6-C10 α-olefin copolymer.

3. The polymer composition (A) according to claim 1 , wherein the plastomer (b) is produced in a solution process in the presence of a metallocene catalyst.

4. The polymer composition (A) according to claim 1 , wherein the plastomer (b) has MFR 2 (190° C./2.16 kg) in the range of 3 to 25 g/10 min.

5. The polymer composition (A) according to claim 1 , wherein the polymer composition comprises a blend of

i) 70 to 85 wt-% of propylene composition (a) and

ii) 15 to 30 wt-% of plastomer (b)

based on the total amount of composition (A).

6. The polymer composition (A) according to claim 1 , wherein the propylene polymer (a-1) of composition (a) is propylene homopolymer or propylene random or block copolymer with ethylene and/or α-olefin comonomers of 4 to 12 C-atoms.

7. The polymer composition (A) according to claim 1 , wherein the low density ethylene polymer (a-2) has a density from 860 to 940 kg/m 3 .

8. A polymer layer structure (PL) comprising

1) Layer 1 of polymer composition (A) comprising a blend of

i) 60 to 90 wt-% of propylene polymer composition (a) comprising a blend of

(a-1) 55 to 95 wt-% of propylene polymer and

(a-2) 5 to 45 wt-% of low density ethylene polymer (LDPE) which is a high pressure polyethylene,

where the amounts of (a-1) and (a-2) are based on the total weight of composition (a), and composition (a) has a melt flow rate MFR 2 of from 10 to 50 g/10 min (230° C./2.16 kg) and the Vicat softening temperature in the range of 120 to 155° C. measured according to ISO 306,

and

ii) 10 to 40 percent by weight of a plastomer (b) of ethylene copolymer with at least one α-olefin comonomer of 4 to 10 C-atoms, provided that at least one co-monomer is a monomer with at least 6 C-atoms,

where the amounts of (i) and (ii) are based on the total weight of the composition (A), and wherein the plastomer b) has a density of 880 to 912 kg/m 3

and

2) Layer 2 of a polymer composition being different to composition (A).

9. An extrusion coated article (EC) comprising

I. a substrate layer (S) and

II. a heat sealable polymer layer (H),

wherein the heat sealable polymer layer (H) comprises a composition (A) comprising a blend of

i) 60 to 90 percent by weight of propylene polymer composition (a) comprising a blend of

(a-1) 55 to 95 percent by weight of propylene polymer and

(a-2) 5 to 45 percent by weight of low density ethylene polymer (LDPE) which is a high pressure polyethylene,

where the amounts of (a-1) and (a-2) are based on the total weight of composition (a), and composition (a) has a melt flow rate MFR 2 of from 10 to 50 g/10 min (230° C./2.16 kg) and the Vicat softening temperature is in the range of 120 to 155° C. measured according to ISO 306,

and

ii) 10 to 40 percent by weight of a plastomer (b) of ethylene copolymer with at least one α-olefin comonomer of 4 to 10 C-atoms, provided that at least one co-monomer is a monomer with at least 6 C-atoms,

where the amounts of (i) and (ii) are based on the total weight of the composition (A), and wherein the plastomer (b) has a density of 880 to 912 kg/m 3 .

10. The extrusion coated article (EC) according to claim 9 , wherein the article comprises a Layer 2 of a polymer composition being different to composition (A) located between the substrate layer (S) and the heat sealable polymer layer (H).

11. The extrusion coated article (EC) according to claim 9 comprising I-i a substrate layer (S) and II-i a polymer layer structure (PL), said PL comprising

1) Layer 1 of polymer composition (A) comprising a blend of

i) 60 to 90 wt-% of propylene polymer composition (a) comprising a blend of

(a-1) 55 to 95 wt-% of propylene polymer and

(a-2) 5 to 45 wt-% of low density ethylene polymer (LDPE) which is a high pressure polyethylene,

where the amounts of (a-1) and (a-2) are based on the total weight of composition (a), and composition (a) has a melt flow rate MFR 2 of from 10 to 50 g/10 min (230° C./2.16 kg) and the Vicat softening temperature in the range of 120 to 155° C. measured according to ISO 306, and

ii) 10 to 40 percent by weight of a plastomer (b) of ethylene copolymer with at least one α-olefin comonomer of 4 to 10 C-atoms, provided that at least one co-monomer is a monomer with at least 6 C-atoms,

where the amounts of (i) and (ii) are based on the total weight of the composition (A), and wherein the plastomer b) has a density of 880 to 912 kg/m 3

and

2) Layer 2 of a polymer composition being different to composition (A).

12. The extrusion coated article (EC) according to claim 9 , wherein the plastomer (b) is produced in solution process in the presence of a metallocene catalyst.

13. The extrusion coated article (EC) according to claim 9 , wherein the plastomer b) is an ethylene-C6-C10 α-olefin copolymer.

14. The extrusion coated article (EC) according to claim 9 , wherein the substrate layer (S) is selected from the group consisting of paper, paperboard, kraft paper, a plastic film, metallised plastic film, a metal foil, woven fabric or plastic, and combinations thereof.

15. The extrusion coated article (EC) according to claim 9 , wherein the article comprises at least one layer (M) being of a polymeric film, metal foil, metallised polymeric film, layer of fibrous material or combinations thereof.

16. A process for producing an extrusion coated article (EC) comprising

extrusion coating a substrate (S) with a draw-down speed of at least 150 m/min by extruding a heat sealable layer (H) or co-extruding at least the polymer layer structure (PL) in a molten state through a flat die onto said substrate at a temperature of from 240 to 320° C.,

wherein the heat sealable polymer layer (H) comprises composition (A) as defined in claim 1 or is part of a polymer layer structure (PL), said PL comprising

1) Layer 1 of polymer composition (A) comprising a blend of

i) 60 to 90 wt-% of propylene polymer composition (a) comprising a blend of

(a-1) 55 to 95 wt-% of propylene polymer and

(a-2) 5 to 45 wt-% of low density ethylene polymer (LDPE) which is a high pressure polyethylene,

where the amounts of (a-1) and (a-2) are based on the total weight of composition (a), and composition (a) has a melt flow rate MFR 2 of from 10 to 50 g/10 min (230° C./2.16 kg) and the Vicat softening temperature in the range of 120 to 155° C. measured according to ISO 306, and

ii) 10 to 40 percent by weight of a plastomer (b) of ethylene copolymer with at least one α-olefin comonomer of 4 to 10 C-atoms, provided that at least one co-monomer is a monomer with at least 6 C-atoms,

where the amounts of (i) and (ii) are based on the total weight of the composition (A), and wherein the plastomer b) has a density of 880 to 912 kg/m 3

and

2) Layer 2 of a polymer composition being different to composition (A).

17. A heat sealable layer of an extrusion coated article, said heat sealable layer comprising the polymer composition (A) as defined in claim 1 .