A new polyether TP urethane from Bayer MaterialScience, Pittsburgh, features very high water-vapor permeability, suitable for film coatings on fabrics. A 15-micron film of Desmopan DP 6580A MVT boasts moisture permeability of 5400 g/m2/day at 100 F and 90% RH. Bayer says this product opens up opportunities for coating sports and leisure wear.
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