Method for production of mixed polymers containing silicon
AssigneeWacker Chemie AG
InventorsKurt Stark, Christian Hogl
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Abstract
Polymer dispersions of polymers derived from silicone macromers and ethylenically unsaturated monomers are capable of incorporating large amounts of chemically bonded macromer, when the silicone macromer and part of the unsaturated monomer are polymerized in aqueous medium as an initial charge with an oil soluble initiator, and the remaining monomers are fed in and polymerized using a water soluble initiator. The dispersions may be dried to form water redispersible polymer powders.
Claims10
1-11. (canceled)
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.
Dependencies are inferred from the claim text.