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1. WO2020229687 - COMPOSITION POLYMÈRE POUR ISOLATION DE CÂBLE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

Claims

1. A polymer composition comprising

(i) at least 40 wt% low density polyethylene (LDPE);

(ii) a polypropylene homopolymer; and

(iii) a random heterophasic polypropylene copolymer.

2. The polymer composition as claimed in claim 1 comprising

(i) 40 to 90 wt% LDPE;

(ii) 5 to 30 wt% of a polypropylene homopolymer; and

(iii) 1.0 to 15 wt% of a random heterophasic polypropylene copolymer.

3. The polymer composition as claimed in claim 1 or 2 comprising

(i) at least 50 wt% LDPE;

(ii) at least 10 wt% of a polypropylene homopolymer; and

(iii) at least 2 wt% of a random heterophasic polypropylene copolymer.

4. The polymer composition as claimed in any preceding claim wherein the LDPE is present in an amount of at least 65 wt% of the polymer composition.

5. The polymer composition as claimed in any preceding claim, wherein the polypropylene homopolymer (ii) is present in an amount of 12 to 25 wt% of the polymer composition.

6. The polymer composition as claimed in any preceding claim, wherein the polypropylene homopolymer has a melting point of 150°C or more.

7. The polymer composition as claimed in any preceding claim, wherein the polypropylene homopolymer (ii) is an isotactic polypropylene homopolymer.

8. The polymer composition as claimed in any preceding claim wherein the random heterophasic polypropylene copolymer comprises 3.0 to 10 wt% of the polymer composition.

9. The polymer composition as claimed in any preceding claim wherein the random heterophasic polypropylene copolymer comprises 10 to 50 wt% of a propylene copolymer rubber component and 50 to 75 wt% of a propylene homopolymer or copolymer matrix component.

10. The polymer composition as claimed in any preceding claim which does not contain a peroxide.

11. The cable, such as a power cable comprising one or more conductors

surrounded by at least one layer, wherein said layer comprises a polymer composition as defined in any of claims 1 to 10.

12. The cable as claimed in claim 11 where said one or more conductors are surrounded by at least an inner semiconductive layer, an insulation layer and an outer semiconductive layer, in that order.

13. The cable as claimed in claim 11 or 12, wherein said layer is an insulation layer.

14. The cable as claimed in claim 13, wherein the insulation layer of said cable is not crosslinked.

15. A process for the preparation of a polymer composition as claimed in any one of claims 1 to 10 comprising compounding:

(i) at least 40 wt% LDPE;

(ii) a polypropylene homopolymer; and

(iii) a random heterophasic polypropylene copolymer.

16. A process for producing a cable comprising the steps of: applying on one or more conductors, a layer comprising a polymer composition as defined in any of claims 1 to 10 or as prepared according to claim 15.

17. Use of a polymer composition as defined in any of claims 1 to 10 or as prepared according to claim 15 in the manufacture of an insulation layer in a cable, preferably a power cable.