Process for the production of water vapor-permeable sheet materials
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United States of America Patent
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Jun 22, 1982
Grant Date -
N/A
app pub date -
Apr 30, 1980
filing date -
Feb 11, 1980
priority date (Note) -
Expired
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Abstract
The specification describes water vapor-permeability sheet materials, particularly useful in the footwear industry. The production of sheet materials which are water permeable, highly resistant to wear, water resistant and mechanically stressable occurs by mechanically foaming a polymeric dispersion, the mechanical foaming being carried out in the presence of a surfactant, the density of the film being adjusted by the mechanical foaming to 0.55-0.85 g/cm.sup.3, gelling the foamed dispersion at a temperature of 120.degree. to 220.degree. C., for at most 10 minutes, and finishing the sheet material by spraying and/or rastering.
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