Patent ID: 9562631
Date: 2017-02-07
CPC Classifications: C08F,C08J,C08K,C08L,F16L

Claim:
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).