Process for the production of conducting wires coated with cross-linked polyethylene
AssigneeNexans
InventorsFranz Dänekas, Marc Strittmatter
Life of this patent
Estimating the term…
Abstract
In a process for the production of conducting wires coated with cross-linked polyethylene in which a granulate made of polyethylene is coated with a fluid cross-linking agent, the coated granulate is melted in an extruder and extruded onto the electrical conducting wire, and the extruded film is cross-linked by being heated to a temperature over the decomposition temperature of the cross-linking agent, a mixture of granulate, meal, or powder made of a polyethylene homopolymer and a polyethylene copolymer is coated with the cross-linking agent and stabilizer, with the portion of copolymer in the coating on the cable lying between 1 and 8 weight percent.
Claims13
A process for the production of an electric cable comprising at least one conducting wire coated with cross-linked polyethylene, the process comprising the steps of:
- mixing (i) a material made of polyethylene, (ii) a fluid cross-linking agent, and (iii) stabilizer to form a mixture;
- melting said mixture in an extruder to form a melt;
- extruding said melt onto the electrical conducting wire to form an extruded layer on the wire;
- and
- cross-linking said extruded layer by heating to a temperature above the decomposition temperature of the cross-linking agent,
- wherein:
- said material made of polyethylene comprises a mixture of granulate, meal, or powder made of a polyethylene homopolymer and a polyethylene copolymer;
- said polyethylene copolymer comprises at least one of ethylene-butyl acrylate (EBA), ethylene-ethyl acrylate (EEA) and ethylene-methyl acrylate (EMA), and said acrylate portion of said polyethylene copolymer is from 10-30 wt % of said copolymer;
- and
- said polyethylene copolymer is between 1 and 8 weight percent of said extruded layer.
Dependencies are inferred from the claim text.