Foam insulation made with expandable microspheres and methods
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United States of America Patent
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Jun 12, 2007
Grant Date -
Sep 9, 2004
app pub date -
May 24, 2002
filing date -
May 25, 2001
priority date (Note) -
Expired
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Abstract
A polyurethane and/or polyisocyanurate foam is made using expandable microspheres which encapsulate a primary blowing agent. By expanding during the foam making process, the microspheres function as a blowing agent. The foam preferably has at least 10% by weight expandable micro spheres which encapsulate a non-halogenated hydrocarbon chemical or a non-halogenated hydrocarbon chemical blend and less than 2% by weight of any non-encapsulated blowing agents.
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