| abstract |
Acrylamide functional siloxanes are made by a method which is an improvement over the method for preparing them by reacting an amino functional siloxane in the presence of a non-aqueous solvent, a metal alkoxide, and a non-aqueous cosolvent for the metal alkoxide. The improvements include using a non-polar solvent, an alcohol cosolvent, cooling a mixture of amino functional siloxane, non-polar solvent, and non-protic acid acceptor before adding the alcohol cosolvent, and neutralizing with a mild base. Conversion of the amino functionality to acrylamide is above 95 percent, the acrylamide has low ionics, and the viscosity of the acrylamide is essentially the same as the viscosity of the starting amino functional siloxane. |