Singlelayer and multilayer polyolefin foam pipes

Details Singlelayer and multilayer polyolefin foam pipes Singlelayer and multilayer polyolefin foam pipes

2006-01-10

2008-12-09

Yao, Sam Chuan (Department: 4111)

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

C428S036500, C428S036900, C428S036920, C428S308400, C428S318600, C138S140000, C138S142000, C138S145000, C138S149000, C264S045100, C264S165000, C264S171100, C264S171110, C264S239000, C427S135000, C427S412300

Reexamination Certificate

active

07462307

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.

REFERENCES:
patent: 5985973 (1999-11-01), Sumitomo et al.
patent: 6077907 (2000-06-01), Raetzsch et al.

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