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1. WO2007137711 - FLAME RETARDANT POLYETHYLENE COMPOSITION COMPRISING POLYPROPYLENE

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[ EN ]

Claims

1. A flame retardant polymer composition comprising
(A) a polyethylene,
(B) a silicone-group containing compound,
(C) an inorganic filler material, and
(D) a polypropylene in an amount of 0.1 to 10 wt.% with
respect to the total composition.

2. Flame retardant polymer composition according to claim 1 , wherein the amount of component (D) is from 0.3 to 4 wt.%.

3. Flame retardant polymer composition according to claim 1 or claim 2, wherein component (D) has a MFR2 measured according to ISO 1 133 at 230 0C and 2.16 kg of 0.1 to 15 g/10 min.

4. Flame retardant polymer composition according to any of the preceding claims, wherein polypropylene (D) is a propylene heterophasic copolymer comprising a polypropylene homo- or copolymer as matrix polymer and an incorporated ethylene-propylene- rubber.

5. Flame retardant polymer composition according to any of the preceding claims, wherein component (D) has a tensile modulus measured according to ISO 527-2 of 400 to 2000 MPa.

6. Flame retardant composition according to any of the preceding claims wherein the amount of polyethylene (A) is from 30 to 70 wt.% of the total polymer composition.

7. Flame retardant composition according to any of the preceding claims wherein polyethylene (A) comprises a polyethylene with a molecular weight distribution Mw/Mn of > 20.

8. Flame retardant composition according to any of the preceding claims wherein polyethylene (A) comprises a polyethylene with polar groups.

9. Flame retardant composition according to claim 8 wherein the polyethylene with polar groups comprises a copolymer of ethylene with one or more co-monomers selected from Ci - to C6- alkyl- acrylates, Cr to C6- alkyl methacrylates, acrylic acid, methacrylic acid and vinyl acetate including ionomers thereof.

10. Flame retardant composition according to claim 8 or 9 wherein the polyethylene with polar groups is present in an amount of at least 50 wt.% of the total weight of component (A).

11. Flame retardant composition according to any of the preceding claims wherein the amount of component (B) is from 1 to 20 wt.% of the total polymer composition

12. Flame retardant composition according to any of the preceding claims wherein component (B) is a silicone fluid and/or gum, and/or a copolymer of ethylene and at least one other co-monomer which comprises a silicone group.

13. Flame retardant composition according to any of the preceding claims wherein component (B) comprises polydimethylsiloxane and/or a copolymer of ethylene and vinyl-polymethylsiloxane.

14. Flame retardant polymer composition according to any of the preceding claims wherein the amount of inorganic filler (C) is from 20 to 60 wt.% of the total polymer composition.

15. Flame retardant polymer composition according to any of the preceding claims, wherein inorganic filler (C) is neither a hydroxide nor a hydrated compound.

16. Flame retardant polymer composition according to any of the preceding claims wherein inorganic filler (C) comprises a carbonate, oxide and/or sulphate of an element of groups 1 to 13 of the Periodic System of the Elements.

17. Flame retardant composition according any of the preceding claims wherein component (C) comprises a metal carbonate.

18. Articles comprising the flame retardant polymer composition according to any of the preceding claims.

19. Wire or cable comprising a layer made of the flame retardant composition according to any of claims 1 to 17.

20. Use of a flame retardant polymer composition according to any of claims 1 to 17 for the production of a layer of a wire or cable.

21. Use of a polypropylene in the production of a flame retardant layer for a wire or cable as a processing aid wherein the polypropylene is present in the composition used for the production of the flame retardant layer in an amount of from 0.1 to 10 wt.%.

22. Use of polypropylene in the production of a flame retardant layer for a wire or cable as a processing aid wherein a composition is used as in claim 1 to 17.