Khadijeh Didehban - Polymer Science Department, Iran Polymer and Petrochemical Institute, P.O. Box: ۱۴۹۶۵/۱۱۵, Tehran, Iran
Iraj Hasanzadeh - Polymer Science Department, Iran Polymer and Petrochemical Institute, P.O. Box: ۱۴۹۶۵/۱۱۵, Tehran, Iran
Ali Reza Mahdavian - Polymer Science Department, Iran Polymer and Petrochemical Institute, P.O. Box: ۱۴۹۶۵/۱۱۵, Tehran, Iran
Amjad sazgar - Polymer Science Department, Iran Polymer and Petrochemical Institute, P.O. Box: ۱۴۹۶۵/۱۱۵, Tehran, Iran

In this study, polymeric latexes with bimodal distribution in particle size were prepared by emulsion copolymerization. The effect of monomer and surfactant amounts in the secondary feed on primary and secondary particle sizes were investigated. The results showed that by control of monomer and surfactant amounts in the second step of polymerization and after formation of primary particles, it is possible to prepare bimodal latex particles with desired primary andsecondary particle sizes and their ratio as well. Primary particles were designed with core-shell structure for application in water base traffic coating and secondary particles had low Tg composition and molecular weight for decreasing minimum film formation temperature (MFFT) to formation of continuous film.

emulsion polymerization, secondary neucliation, bimodal distribution, particle size, latex