Singlelayer and multilayer polyolefin foam pipes
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United States of America Patent
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Dec 9, 2008
Grant Date -
Oct 19, 2006
app pub date -
Jan 10, 2006
filing date -
Jul 20, 2000
priority date (Note) -
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Abstract
Process for producing single layer and multilayer polyolefin foam pipes with improved compression resistance having a polyolefin foam layer which consists of mixtures of modified propylene polymers having strain hardening behaviour or propylene homopolymers with a stereospecificity index >98% or propylene copolymers with a stereospecificity index of the homopolymer matrix of >96%. The polyolefin foam pipes include coated steel pipes for transporting crude oil or gas products or district heating applications, single layer pipes for insulation purposes and for non- or low-pressure applications and multilayer plastic pipes for the transportation of hot or cold fluids.
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