The high organosilicone content polysiloxane/acrylates composite latex with core-shell structure was prepared in the semi-batch emulsion polymerization of methyl methacrylate (MMA) in the presence of polysiloxane latex as seed.The seed was polymerized by octamethylcyclotetrasiloxane (D4) and vinyl methylcyclotetrasiloxane (Vi- D4)

and methyl triethoxysilane (MTES) as crosslinking reagent.The effects of the type

compounding ratio and the weight concentration of emulsifiers on the properties of the emulsion and the average particle size

its distribution

and the morphology of the obtained latex particles were studied. The particle diameter increased in the order of three anionic emulsifiers: sodium dodecyl sulfate (SDS)

sodium dodecyl sulfonate (SDS-2) and sodium dodecyl benzenesulfonate(SDBS).With decreasing compounding ratio of SDS/OP-10

the rate of polymerization and conversion of monomer reduced and the chemical stability of latex increased

while the latex particle size and its distribution increased.Considering all-around factors of emulsion

the best compounding ratio of SDS/OP-10 was 5∶1.Furthermore

a higher concentration of emulsifiers would cause smaller particle size

narrower particle size distribution

and faster rate of polymerization and higher conversion of monomer.The particle size distribution could be narrowed by changing the mode of adding emulsifier.In order to reduce the generation of new shell polymer particles the concentration of emulsifier must be strictly controlled to keep MMA in a “starvd”state.The polymerization of shell monomer would be restricted on the “transition area” on the surface of polysiloxane seeds to form core-shell structure composite particles.