Patent ID: 9156954
Filing Date: 2015-10-13
Classification: A61K,A61Q,C08G,C08J,C08L,C11D

Abstract:
1. A method of preparing an emulsion containing particles of an organopolysiloxane polymer having an average particle diameter of less than 1 μm, the method comprising: (i) combining a silanol end-blocked organosiloxane starting polymer, water, and a surfactant, wherein said starting polymer has a viscosity of at least 2 Pa·s and up to 150 Pa·s; (ii) emulsifying the starting polymer by agitating or shearing the starting polymer, water and surfactant; (iii) polymerizing the starting polymer to form a longer chain silanol end-blocked organopolysiloxane polymer; wherein at least a portion of said polymerizing step is performed at a temperature of less than or equal to 16° C., and wherein the emulsion contains less than 0.1 wt % of octamethylcyclotetrasiloxane and less than 0.1 wt % decamethylcyclopentasiloxane.