Abstract: Three feeding processes: single addition of all reagents together, drip feeding of monomer emulsion and dripping of initiator in preparation of the title composite copolymer emulsion have been compared. The second process appeared to be the best one. The emulsion thus obtained has smaller particle size and better stability.

Key words: hydrogen-containing polymethylsiloxane, butyl acrylate, hydroxymethyl-acrylamide, composite emulsion, preparation process