Oxy ring-substituted ethyl 2-cyano-3-phenyl-2-propenoates were prepared and copolymerized with vinyl acetate. The compositions of the copolymers were calculated from nitrogen analysis and the structures were analyzed by IR, H 1 and 13 C-NMR. Thermal gravimetric analysis indicated that the copolymers decompose in in two steps, first in the 200-500C range with residue (13-16 wt%), which then decomposed in the 500-650ºC range.