Patent ID: 8592028
Filing Date: 2013-11-26
Classification: B29C,B29K,B32B,C08J,C08K,C08L,Y10T

Abstract:
1. A bi-axially stretched breathable film comprising a homogeneous polymeric mixture, said polymeric mixture comprising based on the total weight of the polymeric mixture at least 50% by weight of at least one breathable polyether block copolymer, comprising between 55% by weight and 85% by weight of polyether, said breathable polyether block copolymer comprising hard segments comprising polybutylene terephthalate (PBT) and soft segments, having a I molecular weight of 200 to 3000 g/tool, comprising a polyethylene glycol and polypropylene glycol, said breathable polyether block copolymer exhibiting a weight increase at a temperature of 23° C. of 1.5% minimum after a 24-hour immersion in water according to the method of ASTM D570, and from 0.5 to less than 50% by weight of at least one polyester.