Waterproof breathable composite materials for fabrication of flexible membranes and other articles

Abstract

A waterproof breathable material has a higher strength-to-weight ratio and higher tear resistance-to-weight ratio than traditional materials, and may be applied in a wide field of potential uses. A non-woven composite material comprises at least one waterproof breathable (W/B) membrane, a first unidirectional non-woven composite layer having multiple fibers enclosed by adhesive in parallel to each other, a second unidirectional non-woven composite layer having multiple fibers enclosed in adhesive in parallel to each other. The first unidirectional non-woven composite layer is positioned such that the fibers are oriented 90° relative to the fibers of the second unidirectional non-woven composite layer, and a space is formed between the first and second multiple fibers. No adhesive is present in the space.

Dependencies are inferred from the claim text.