摘要 |
<p>The invention is directed to stretched polyolefin materials having an E-m odulus of at least 17 GPa, preferably at least 20 GPa and a strength of at l east 400 MPa, comprising a polyolefin and a nano-material, such as a nucleat ing agent, which material is obtainable by a process comprising a stretching step wherein the material is stretched at a stretch ratio of at least 16. T he materials of the invention can be produced by a process comprising the st eps of: providing a compound of a polyolefin material and a nano-material, e .g. a nucleating agent, wherein the nano-material is dispersed preferably on a molecular scale in the polyolefin material, extruding this compound, foll owed by a stretching step wherein the material is stretched to a total stret ch ratio of at least 16.</p> |