Process for the preparation of organopolysiloxanes

Details Process for the preparation of organopolysiloxanes Process for the preparation of organopolysiloxanes

1980-03-27

1981-09-29

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

260 37SB, 528 28, 525477, 556420, C08G 7706

Patent

active

042924235

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.

REFERENCES:
patent: 3993606 (1976-11-01), von Bonin et al.

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