Hybrid rope
The invention relates to a hybrid rope having a core containing high modulus polyethylene (HMPE) yarns surrounded by an outer layer containing steel wire strands, wherein the core is coated with a plastomer, the plastomer being a semi-crystalline copolymer of ethylene or propylene and one or more C2 to C12 α-olefin co-monomers and the plastomer having a density as measured according to ISO1183 of between 870 and 930 kg/m 3 .
1. A hybrid rope having a core containing high modulus polyethylene (HMPE) yarns surrounded by an outer layer containing steel wire strands, wherein the core is coated with a plastomer, the plastomer being a semi-crystalline copolymer of ethylene or propylene and one or more C2 to C12 α-olefin co-monomers and the plastomer having a density as measured according to ISO1183 of between 870 and 930 kg/m 3 .
2. The hybrid rope according to claim 1 wherein the plastomer is manufactured by a single site catalyst polymerization process.
3. The hybrid rope according to claim 1 wherein the plastomer is a thermoplastic copolymer of ethylene or propylene and contains as co-monomers one or more α-olefins having 2-12 C-atoms.
4. The hybrid rope according to claim 1 wherein the plastomer has a density of between 880 and 910 kg/m 3 .
5. The hybrid rope according to claim 1 wherein the plastomer has a peak melting point of between 70° C. and 120° C.
6. The hybrid rope according to claim 1 wherein the HMPE yarns contain fibers which are gel spun fibers of ultrahigh molecular weight polyethylene (UHMWPE).
7. The hybrid rope according to claim 1 , wherein the HMPE yarns contain fibers of HMWPE having an intrinsic viscosity of at least 3 dl/g determined in decalin at 135° C.
8. The hybrid rope according to claim 1 , wherein the HMPE yarns contain fibers having a tensile modules of at least 30 GPa.
9. The hybrid rope according to claim 1 wherein the core is a braided or laid rope.