Patent ID: 7666965

Claim:
A process for preparing an aqueous dispersion of silicone-containing copolymers of an ethylenically unsaturated organic monomer and a silicone macromer, or a water-redispersible polymer powder prepared therefrom, comprising: initially charging at least one silicone macromer and a portion of ethylenically unsaturated organic monomer(s); initiating polymerization with an oil-soluble free radical polymerization initiator having a solubility in water of <1% by weight; and subsequently adding the remainder of the ethylenically unsaturated organic monomer(s) and a water-soluble initiator having a solubility in water of >10% by weight to form an aqueous polymer dispersion, and optionally drying an aqueous polymer dispersion thereby obtained to form a redispersible polymer powder.