| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a coextrusion film characterized by an especially low stretching force when stretched for the first time and good, uniform mechanical characteristics.SOLUTION: The present invention relates to a coextrusion film having: a core layer (1) of a thermoplastic elastomer; and two outer layers (2), which are each formed of a polymer having a lower elasticity than the thermoplastic elastomer, in which the outer layers (2) each have a layer thickness of less than 15μm and cells (3) formed through foaming. According to the invention, the density of the foamed outer layers (2) is less than 0.800 g/cm, in which the outer layer (2) has more than 500 cells (3) per cubic millimeter (mm) of volume. The invention also provides a method for producing the coextrusion film, in which for the foamed outer layers (2), a foaming agent is added to an extruder at a pressure between 35 and 75 bar.</p> |
