Process for the production of an underlay for roofs
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United States of America Patent
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Sep 11, 2012
Grant Date -
Sep 18, 2008
app pub date -
Dec 14, 2004
filing date -
Dec 18, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A method is provided for the production of an active-breathing composite in the form of a web, consisting of a nonwoven made of synthetic material and a layer fully or mainly consisting of polyurethane for utilization as counter ceiling webs for roofs and as facade webs. PU or a mixture of materials with a high fraction of PU is heated to melting temperature and extruded on a nonwoven made of PP in order to form a diffusion-open coating of the PP nonwoven and then pressing the PP nonwoven in order to form an active-breathing composite.
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Cited Art Landscape
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