| US 7,449,240 B2 | ||
| Monoaxially elastic laminate film | ||
| Markus Hamulski, Gronau-Epe (Germany); Andreas Hagemann, Dülmen (Germany); and Matthias Perick, Ahaus-Alstätte (Germany) | ||
| Assigned to Nordenia Deutschland Gronau, GmbH, Gronau (Germany) | ||
| Filed on Nov. 27, 2002, as Appl. No. 10/306,801. | ||
| Claims priority of application No. 101 58 345 (DE), filed on Nov. 28, 2001. | ||
| Prior Publication US 2003/0134126 A1, Jul. 17, 2003 | ||
| Int. Cl. B32B 27/00 (2006.01); B32B 27/32 (2006.01); B32B 27/40 (2006.01) | ||
| U.S. Cl. 428—411 [428/423.1; 428/424.8; 428/516; 428/523] | 3 Claims |
| 1. A monoaxially elastic laminate film comprising a core layer made of a thermoplastic elastomer and at least one skin layer
co-extruded together with said core layer,
wherein said at least one skin layer comprises a thermoplastic plastic with a molecular lattice that becomes brittle when
said lattice solidifies, said plastic stretching only slightly when a stretching force is applied and breaks without any transition
when a predetermined tear force has been exceeded;
wherein said molecular lattice that becomes brittle when said lattice solidifies is irreversibly broken up by monoaxial stretching
in the stretching direction, but is maintained perpendicular to the stretching direction, and thereby reinforces the film
in the crosswise direction,
so that said skin layer can be stretched by at least 50% in a preferred stretching direction at a tensile force that is needed
to stretch the core layer by 100%, while stretching in the crosswise direction is by less than 5% when the same force is applied;
wherein said skin layer is broken up only in certain regions, as a result of being stretched in the stretching direction;
and
wherein said skin layer contains inorganic filler additives.
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