A method for forming multi-layered fiber including a core, a first layer, and a second layer. The core has an exterior surface portion containing polypropylene. The first layer is applied to at least a portion of the core and contains a first polymer. The first polymer contains a polymer having at least...http://www.google.fr/patents/US8133537?utm_source=gb-gplus-shareBrevet US8133537 - Method of forming a multi-layered fiber
