PROCESS FOR RIGID POLYURETHANE FOAMS
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United States of America Patent
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Issued Date -
Aug 16, 2001
app pub date -
Feb 22, 1999
filing date -
Feb 25, 1998
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Process for preparing rigid polyurethane or urethane-modified polyisocyanurate foams comprising the step of reacting an organic polyisocyanate with a polyfunctional isocyanate-reactive component in the presence of a blowing agent mixture comprising from 50 to 90% by weight of cyclopentane and from 10 to 50% by weight of a mixture comprising isopentane and/or n-pentane and isobutane and/or n-butane wherein the weight ratio of isopentane and/or n-pentane over isobutane and/or n-butane is between 5/95 and 95/5.
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