Abstract: Acrylate copolymer latexes modified with organosilicons were prepared using monomer emulsion addition process, batch and initiator addition processes, The results of particle morphology and latex stability, obtained from different copolymerization processes,showed that stable latex can be produced only by monomer emulsion addition process.Mechanisms of the emulsion polymerization were discussed.Films were casted from diluted latexes. Hardness, water absorption, solubility in THF of various films were also studied, it was found that polymerization and filmproperties are significantly influenced by organosilicon content.The cross-linking density of copolymers was increased and water absorption decreased with increase in organosilicons. Keeping the total organosilicon content constant (MATS+D₄at 10% by weight) and with increasing D₄/MATS, latex film hardness was seriously diminished when D₄/MATS was below 1, and a slow decrease was observed whenthis ratio was above 1.

Key words: Modified acrylate copblymer latex, Emulsion polymerization process, Organosilicon compound, Film property