Polymer composition for crosslinked articles

摘要

The invention is directed to a use of a polymer composition comprising an ethylene polymer for producing a crosslinked article, a process for producing a crosslinked article and to a crosslinked article comprising a crosslinked polymer composition which comprises a crosslinked ethylene polymer.

主权项

1. A process for the preparation of a crosslinked article comprising:
(I) polymerising ethylene optionally together with one or more comonomer(s) in the presence of a Ziegler-Natta catalyst as the sole catalyst, so as to form an ethylene polymer which is an ethylene homopolymer or a copolymer of ethylene with one or more C4-12 alpha-olefin comonomers containing carbon-carbon double bonds in an amount of more than 0.5 carbon-carbon bonds/1000 carbon atoms measured by FTIR, wherein said polymerisation is carried out without using any polyunsaturated comonomers; (II) making a polymer composition comprising at least 50 wt % of said ethylene polymer, wherein said polymer composition has a crosslinkability expressed as a gel content of at least 80 wt % when measured from a disc sample of the crosslinked ethylene polymer (ASTM D 2765-01, Method A, decaline extraction); (III) forming an article consisting of said polymer composition of step (II); (IV) crosslinking the article obtained from step (III).