Process for the preparation of organopolysiloxanes

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

C - Chemistry, Metallurgy

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C08G 77/26 (2006.01) C08G 18/24 (2006.01) C08G 18/61 (2006.01) C08K 5/29 (2006.01) C08K 5/57 (2006.01)

Patent

CA 1126894

ABSTRACT OF THE DISCLOSURE Organopolysiloxanes having substituted carbamoyloxy groups which are bonded to silicon atoms via oxygen, are provided herein. They may be prepared by reacting diorganopolysiloxane having at least on Si-bonded hydroxyl groups with an organic iso- cyanate having at least 2 isocyanate groups per molecule in the presence of a catalystic amount of a catalytic amount of an organic tin compound. The stability of the organopolysiloxanes containing carbamoyloxy groups has been found to be improved if the diorgano- polysiloxane groups is reacted with the organic isocyanate in the presence of the catalytic amount of the 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. The compound may be used as lubricants for organic or inorganic fibers, as coatings for glass, or to improve the ap- pearance and feel of synthetic and natural leather, as well as additives in manufacturing or processing of polyurethanes.

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