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Plastics pipes of polyolefins

  • US 7,485,685 B2
  • Filed: 10/19/2006
  • Issued: 02/03/2009
  • Est. Priority Date: 11/23/2001
  • Status: Expired due to Term
First Claim
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1. A method for producing a polyolefin pipe comprising:

  • preparing a polyolefin by polymerization in a single-line plant in the presence of a silica-xerogel-supported chromium catalyst activated with air and modified with an inorganic fluorinating agent,combining said polyolefin with further additives in an amount of from 0 to 10% by weight; and

    shaping said combination into the form of a pipe by means of melt extrusion.

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