Jacket with improved properties
AssigneeBorealis AG
InventorsAnna Hjärtfors, Yi Liu, Ravindra Tupe, Victor Sumerin
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Abstract
The present invention relates to a multimodal ethylene copolymer composition having a density of 920 to 949 kg/m3 and a flexural modulus, wherein said flexural modulus is following the equation: Flexural modulus [MPa]<21.35·density [kg/m3]−19585 [1]. The multimodal ethylene copolymer composition according to the invention can be used in a highly flexible cable jacket, preferably a power cable jacket.
Claims13
A multimodal ethylene copolymer composition comprising an ethylene copolymer having a density of 930 to 949 kg/m3, measured according to ISO 1183-1:2004 Method A on compression, molded specimen prepared according to EN ISO 1872-2 (February 2007), obtainable by a process comprising
- a first polymerization stage, wherein a first copolymer is produced from ethylene and an alpha-olefin comonomer, and
- a second polymerization stage, wherein a second copolymer is produced from ethylene and an alpha-olefin comonomer,
- said multimodal ethylene copolymer composition comprising at least two alpha-olefin comonomers selected from 1-butene and 1-hexene and a flexural modulus, wherein said flexural modulus is measured according to the method of ISO 178 by using compression molded test specimens produced according to EN ISO 1872-2, and wherein numerical values of said flexural modulus, in MPa, and density, in kg/m3 follow the inequality:
- Flexural modulus [MPa]<21.35·density [kg/m3]19585 [1],
- wherein the Flexural modulus is at least 245.5 MPa, and
- wherein the Shore D (1s) of the multimodal ethylene copolymer composition, as measured according to ISO868 on specimen molded according to EN ISO 1872-2, is at least 53.
The multimodal ethylene copolymer composition according to claim wherein said multimodal ethylene copolymer composition has MFR5 of 0.3 to 12 g/10 min.
A cable jacket comprising a multimodal ethylene copolymer composition comprising an ethylene copolymer having a density of 930 to 949 kg/m3, measured according to ISO 1183-1:2004 Method A on compression molded specimen prepared according to EN ISO 1872-2 (February 2007), obtainable by a process comprising
- a first polymerization stage, wherein a first copolymer is produced from ethylene and an alpha-olefin comonomer, and
- a second polymerization stage, wherein a second copolymer is produced from ethylene and an alpha-olefin comonomer,
- said multimodal ethylene copolymer composition comprising at least two alpha-olefin comonomers selected from 1-butene and 1-hexene and a flexural modulus, measured according to the method of ISO 178 by using compression molded test specimens produced according to EN ISO 1872-2, and wherein numerical values of said flexural modulus, in MPa, and density, in kg/m3 follow the inequality:
- Flexural modulus [MPa]<21.35·density [kg/m3]−19585 [1],
- wherein the Flexural modulus is at least 245.5 MPa, and
- wherein the Shore D (1s) of the multimodal ethylene copolymer composition, as measured according to ISO868 on specimen moulded according to EN ISO 1872-2, is at least 53.
Dependencies are inferred from the claim text.