Permanent gas blown microcellular polyurethane elastomers
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United States of America Patent
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Feb 8, 2000
Grant Date -
N/A
app pub date -
Jul 9, 1998
filing date -
Jul 9, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Microcellular polyurethane elastomers having sharply reduced or virtually no urea linkages may be prepared without resort to organic physical blowing agents by frothing a frothable mixture containing isocyanate reactive polyols and chain extenders, and a frothable isocyanate component. The isocyanate component is derived by reacting a stoichiometric excess of a di- or polyisocyanate with a polyol component containing an ultra-low unsaturation polyol. The froth-produced elastomers surprisingly exhibit greatly improved tear strengths, compression set, and other physical properties as compared to all water-blown microcellular elastomers of the same density.
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