Process for making microcellular polyurethane elastomers
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United States of America Patent
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-
Aug 8, 2000
Grant Date -
N/A
app pub date -
Sep 25, 1998
filing date -
Sep 25, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Microcellular elastomers and a process for making them are disclosed. The process comprises reacting a resin component ('B' side) with an isocyanate-terminated prepolymer ('A' side). Pre-reacting the right proportion of chain extender into an 'A' side that also includes a high-primary, low-unsaturation polyol is the key to making low-density (less than 0.5 g/cm.sup.3) microcellular elastomers while avoiding problems with poor processing or inferior physical properties. The process is easy to practice, and provides lighter, high-quality polyurethane products, including protective sports equipment, arm rests or steering wheels for the auto industry, and midsoles or shoe soles for footwear.
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