VERFAHREN ZUR HERSTELLUNG EINER MEHRSCHICHTIGEN ROHRLEITUNG

摘要

A multilayer pipe having improved resistance to rapid crack propagation is described.; The pipe consists of at least two layers of different propylene plastic materials, which are so selected and combined that the pipe has a resistance to rapid crack propagation, measured as the critical temperature, which is equal to or lower than 0° C. The pipe is made of polypropylene plastic, and at least one of the layers of the pipe comprises a polypropylene plastic, which is selected from a propylene contanig from 1.0 to 10.0% by weight of ethylene or C4-C10-alpha-olefin repeating units and having an MFR2 value of between 0.05 and 0.40 g/10 min or an elastromer-modified polypropylene containing from 1.0 to 30% by weight of ethylene or C4-C10-alpha olefin repeating units and having an MFR2 value of between 0.05 and 50 g/10 min.