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Process for the preparation of organopolysiloxanes

  • US 4,292,423 A
  • Filed: 03/27/1980
  • Issued: 09/29/1981
  • Est. Priority Date: 04/19/1979
  • Status: Expired due to Term
First Claim
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1. A process for preparing organopolysiloxanes having substituted carbamoyl groups which are bonded to silicon through oxygen, which comprises reacting a diorganopolysiloxane having at least one Si-bonded hydroxyl group with an organic isocyanate having at least 2 isocyanate groups per molecule as the sole reactants in the presence of a catalytic amount of an organic tin compound supported on a solid material and thereafter separating the resultant reaction product from the catalyst under anhydrous conditions.

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