| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a two-layered plastic tubing piece which meets the requirements of the 150°C temperature class. <P>SOLUTION: The two-layered plastic tubing piece for pressurized fluid conduits comprises an inner layer and an outer layer. The inner layer is formed from a first mixture comprising an elastic co-polyolefin or a blend of a partially crystalline polyolefin with synthetic olefin rubber, and homopolyamide. The outer layer is formed from a second mixture comprising homopolyamide. Both mixtures of the inner layer and the outer layer comprise the same homopolyamide, which has ≥200°C melting point and ≥8 average carbon atoms per monomer unit, and an impact modifier derived from acid-modified ethylene-α-olefin copolymers is added to each of both the mixtures. The two-layered plastic tubing piece is preferably formed as a fluid conduit for automobiles, in particular, as a cooling system for automobiles. <P>COPYRIGHT: (C)2011,JPO&INPIT |
