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at short notice. both use a ziegler (or phillips) catalyst. if pure ethene is used, hdpe is formed. lldpe is produced when a small amount of another alkene, for example but- -ene, is added to the ethene. another form, discussed below, mlldpe, is, at present, produced in much smaller quantities. manufacture
of poly(ethene) (polyethylene) poly(ethene) is made by several methods by addition polymerization of ethene, which is principally produced by the cracking of ethane and propane, naphtha and gas oil. a new plant is being constructed in brazil for the production of poly(ethene), from ethene, that is made...
https://www.essentialchemicalindustry.org/polymers/polyethene.html