Patent ID: 6201063
Filing Date: 2001-03-13
Classification: C08G

Abstract:
In a process of emulsion polymerization in which the polymerization reaction involves opening of polysiloxane rings of a cyclic organosilicon precursor using an anionic catalyst or a cationic catalyst in the presence of water, to form higher molecular weight polysiloxanes in the emulsion, the improvement comprising using as the cyclic organosilicon precursor in the reaction, a cocyclic silicone having the formula: ##STR10##where a and b each represent integers having values of 1-10; R3, R4, and R5 each represent alkyl groups containing 1-6 carbon atoms; and R6 represents an alkyl group containing at least eight or more carbon atoms; the reaction including another organosilicon precursor comprising an aminoalkylsiloxane homopolymer having a structure corresponding to one of the formulas: ##STR11##wherein c represents an integer having a value of 1-20, and A represents an aminoalkyl group.