Expansion of polymeric microspheres insitu in a rigid PUR/PIR foam formulation using a twin screw extruder
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United States of America Patent
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Feb 8, 2000
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N/A
app pub date -
Sep 22, 1998
filing date -
Sep 22, 1998
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Expired
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Abstract
The present invention relates to a process for producing a dispersion of polymeric microspheres in a polyol comprising expanding 1 to 70% by weight of polymeric beads in a polyol with a twin screw extruder to simultaneously mix and expand the beads to create a uniform dispersion of the microspheres in the polyol such that the wetting of the microspheres by the polyol is maximized.
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