Cable jacket composition
AssigneeBorealis AG
InventorsAnna Hjärtfors, Yi Liu, Joseph Thorman, Victor Sumerin
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Abstract
The present invention relates to a cable jacket composition comprising a multimodal olefin copolymer, said copolymer having density of 0.935-0.960 g/cm3 and MFR2 of 2.2-10.0 g/10 min and said composition having ESCR of at least 2000 hours and a cable shrinkage of 0.70% or lower. The invention further relates to the process for preparing said composition and its use as outer jacket layer for a cable, preferably a communication cable, most preferably a fiber optic cable.
Claims17
A cable jacket composition comprising a multimodal olefin copolymer, wherein the multimodal olefin copolymer has density of 0.935-0.960 g/cm3 measured according to ISO 1183-1:2004 on compression molded specimen prepared according to EN ISO 1872-2;
- MFR2 of 2.2-10.0 g/10 min measured according to ISO 1133-1 at 190° C., and a molecular weight distribution of 7 to 12, determined by gel permeation chromatography according to ISO 16014-1:2003, ISO 16014-2:2003, ISO 16014-4:2003 and ASTM D 6474-12 and the composition has ESCR of at least 2000 hours measured according to IEC 60811-406, method B and cable shrinkage of 0.70% or lower, wherein the multimodal olefin copolymer is produced in two or more reactors;
- and
- wherein the polymerization of the multimodal olefin copolymer comprises two successive main polymerization stages in the presence of a MgCl2 supported catalyst prepared according to a method comprising the steps of
- a) providing solid carrier particles of MgCl2*m OH adduct;
- b) pre-treating the solid carrier particles of step a) with a compound of Group 13 metal;
- c) treating the pre-treated solid carried particles of step b) with a transition metal compound of Group 4 to 6;
- d) recovering the solid catalyst component;
- wherein the solid carrier particles are contacted with an internal organic compound of formula (I) or isomers or mixtures therefrom before treating the solid carrier particles in step c)
- and wherein in the formula (I), R1 to R5 are the same or different and can be hydrogen, a linear or branched C1 to C8-alkyl group, or a C3-C8-alkylene group, or two or more of R1 to R5 can form a ring, the two oxygen-containing rings are individually saturated or partially unsaturated or unsaturated, and R in the adduct MgCl2*mROH is a linear or branched alkyl group with 1 to 12 C atoms, and m is 0 to 6;
- and
- wherein the multimodal olefin copolymer comprises 43.1 wt % to 59.2 wt % of a low molecular weight fraction and 40.8 wt % to 56.9 wt % of a high molecular weight fraction.
A process for preparing a multimodal olefin copolymer, wherein the multimodal olefin copolymer has density of 0.935-0.960 g/cm3 measured according to ISO 1183-1:2004 on compression molded specimen prepared according to EN ISO 1872-2;
- MFR2 of 2.2-10.0 g/10 min measured according to ISO 1133-1 at 190° C., and a molecular weight distribution of 7 to 12, determined by gel permeation chromatography according to ISO 16014-1:2003, ISO 16014-2:2003, ISO 16014-4:2003 and ASTM D 6474-12 and the composition has ESCR of at least 2000 hours measured according to IEC 60811-406, method B and cable shrinkage of 0.70% or lower;
- wherein polymerization of the multimodal olefin copolymer comprises two main polymerization stages in the presence of a MgCl2 supported catalyst prepared according to a method comprising the steps of a) providing solid carrier particles of MgCl2*m OH adduct;
- b) pre-treating the solid carrier particles of step a) with a compound of Group 13 metal;
- c) treating the pre-treated solid carried particles of step b) with a transition metal compound of Group 4 to 6;
- d) recovering the solid catalyst component;
- wherein the solid carrier particles are contacted with an internal organic compound of formula (I) or isomers or mixtures therefrom before treating the solid carrier particles in step c)
- and wherein in the formula (I), R1 to R5 are the same or different and can be hydrogen, a linear or branched C1 to C8-alkyl group, or a C3-C8-alkylene group, or two or more of R1 to R5 can form a ring, the two oxygen-containing rings are individually saturated or partially unsaturated or unsaturated, and R in the adduct MgCl2*mROH is a linear or branched alkyl group with 1 to 12 C atoms, and m is 0 to 6.
Dependencies are inferred from the claim text.