Process for the preparation of organopolysiloxanes
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United States of America Patent
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Sep 29, 1981
Grant Date -
N/A
app pub date -
Mar 27, 1980
filing date -
Apr 19, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Organopolysiloxanes having substituted carbamoyloxy groups (.tbd.SiOCO--NH--) bonded to silicon via oxygen, which are prepared by reacting an organopolysiloxane containing Si-bonded hydroxyl groups with an organic isocyanate in the presence of an organic tin compound. The stability of the organopolysiloxanes containing carbamoyloxy groups may be improved if the organopolysiloxane having Si-bonded hydroxyl groups is reacted with an organic isocyanate in the presence of an organic tin compound which is supported on a solid carrier and then the reaction product is filtered under anhydrous conditions to remove the supported organic tin compound.
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