When the acrylates containing rosin or hydrogenated rosin were emulsion copolymerized in one step

the conversion of monomers was obviously reduced because of the chain transfer of free radical to the tackifiers. The overall conversion of monomers can be largely increased if the seed emulsions were first prepared by the copolymerization of most of acrylates and then the remainder acrylates in which tackifiers have dissolved were copolymerized by adding them into the seed emulsion. The morphology of the emulsion particles formed by two-step copolymerization were investigated by TEM and the mechanism of the second-step copolymerization was discussed.The adhesion properties of the emulsion copolymers obtained bu using two-step emulsion copolymerization of the acrtlates in which tackifiers have been dissolved are much better than those of the emulsion copolymers obtained by using one-step method.