Patent ID: 7820562
Filing Date: 2010-10-26
Classification: C08F,C08G,C08L,Y10T

Abstract:
1. A composite structure comprising a nonwoven made of a fibrous material and applied thereon at least one first layer, said at least one first layer being made from a thermoplastic composition comprising at least one functionalized polyolefin obtained either by copolymerization or by grafting of a polyolefin backbone with an unsaturated monomer comprising an anhydride, acid or epoxide function, said functionalized polyolefin being grafted with polyether grafting agents comprising a terminal amine, the functionalized polyolefin grafted with polyether being obtained by reactive extrusion as a breathable waterproof material having a water vapor permeability of at least 300 g/m 2 24 h −1 measured according to the standard ASTM E96, method BW (38° C./50% relative humidity), for a film of 25 μm.