Dow Corning Corporation

Benoit Rassart

Severine Cauvin

Sophie Hanssens

Blondine Donatienne Van Roy

Alberto Petrosino

The invention relates to a method for the production of silicone in water emulsions by emulsion polymerization. The emulsion contains particles of an organopolysiloxane polymer having an average particle diameter of less than 1 &#x3bc;m. The method comprises: &#x2014;combining a silanol end-blocked organosiloxane starting polymer, water, and a surfactant; said starting polymer having a viscosity of at least 2 Pa&#xb7;s preferably at least 2.5 Pa&#xb7;s preferably at least 3.5 Pa&#xb7;s preferably at least 4 Pa&#xb7;s and up to 150 Pa&#xb7;s; &#x2014;emulsifying the starting polymer by agitating or shearing the ingredients; &#x2014;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&#xb0; C. preferably less than or equal to 15&#xb0; C.

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La Louviere, Belgium

Benoit Rassart