Cationically curable polyurethane compositions having vinyl ether functionality
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United States of America Patent
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Feb 26, 1991
Issued Date -
N/A
app pub date -
Sep 8, 1989
filing date -
Mar 24, 1988
priority date (Note) -
Expired
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Abstract
A cationically curable polyurethane composition comprises the reaction product of an organic polyisocyanate with a transvinylation polyhydric alcohol mixture containing hydroxy groups. The polyisocyanate consumes substantially all of the available hydroxy groups in the transvinylation polyhydric alcohol mixture. These compositions are particularly useful in stereolithography. A method of transvinylation utilizing ultrasonic energy is also disclosed.
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