| abstract |
This invention provides a moisture-permeable, waterproof film characterized in that it consists of two or more resin layers comprising, as polymerizing components, bishidroxyalkyl aliphatic acid and alkyleneglycol, said bishydroxyalkyl aliphatic acid content is 0.08 mmol/g to 0.5 mmol/g, at least a part of said alykyleneglycol is polyethylene glycol contained in an amount of 40 wt% to 80 wt% based on said solid resin, and a moisture permeability by JIS L-1099 "Potassium Acetate Method" (B-1 method) at average film thickness of 20 micrometers being not less than 3 × 10 3 g/m2 - 24h and not more than 200 × 10 3 g/m2 .cndot. 24h, and a moisture-permeable waterproof composite material to which said moisture-permeable, waterproof film is provided at least on one surface of a substrate material and its moisture permeability by JIS L-1099 "Potassium Acetate Method" (B-1 method) being not less than 1 × 10 3 g/m2 -24h and not more than 50 × 10 3 g/m2 .cndot. 24h . This invention makes use of a polymer having excellent moisture permeability, waterproofness durability and capability of being made aqueous, and accordingly, this invention provides a moisture-permeable, waterproof film and a composite material which can be manufactured by an ecological process. |