Prepolymer composition for producing insulating foams with increased foam yield
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United States of America Patent
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app pub date -
Jul 6, 2001
filing date -
Aug 23, 1999
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Abstract
The invention relates to a prepolymer composition, in particular for producing insulating foams, based on a polyisocyanate with a functionality of at least 2 and a polyol with at least two OH groups in the molecule, the prepolymer having an isocy-anate content of 6 to 20 wt % and the composition containing usual additives and a propellant gas component which is liquid under pressure, and the prepolymer com-position containing at least 18 wt % of propellant gas based on the weight of the composition, said propellant gas component being present in the form of a propellant phase emulsified in the prepolymer composition alongside the moiety dissolved in the prepolymer composition.
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