Radical emulsion polymerizations of vinylcyclopropanes, 1,1-bis(ethoxy
carbonyl)-2-vinylcyclopropane (ECVCP) and 1,1-dichloro-2-vinylcyclopro
pane (CVCP) were examined. ECVCP underwent soap-free and soap-in emuls
ion polymerizations satisfactorily to afford the ring-opened polymer i
n good yields. Polymer emulsions were obtained in a spherical shape wi
th single particle size distribution. Meanwhile, emulsion polymerizati
on of CVCP proceeded in only a low conversion. (C) 1998 John Wiley & S
ons, Inc.