Patent ID: 7722891
Filing Date: 2010-05-25
Classification: B01F

Abstract:
1. A multiple emulsion which is stable against coalescence, comprising a composition A 1 /B/A 2 or B 1 /A/B 2 , wherein A, A 1 , and A 2 are polar phases and B, B 1 , and B 2 are non-polar phases, and at least first and second particulate silica dispersants, each having mean particle sizes less than 1 μm, the first silica dispersant wettable by a phase A, A 1 , or A 2 contained in the multiple emulsion and also wettable by a phase B, B 1 , or B 2 contained in the multiple emulsion, the second silica dispersant wettable by a phase B, B 1 , or B 2 contained in the multiple emulsion, but not wettable by a phase A, A 1 , or A 2 contained in the multiple emulsion, said multiple emulsions prepared by a process comprising: a) when the multiple emulsion is an A b) when the multiple emulsion is a B wherein the multiple emulsion contains less than or equal to 0.1 times the critical micelle concentration of surface active substances in the polar phases A, A 1 , and A 2 , such that in the absence of said silica dispersants, a multiple emulsion containing less than or equal to 0.1 times the critical micelle concentration of surface active substances exhibits coalescence.