Polyvinyl alcohol (PVOH) plays an important role as a protective colloid for the emulsion polymerization of vinyl acetate (VAc), and the performance of PVAc (polyvinyl acetate) emulsion is strongly influenced by the characteristics of PVOH. KURARAY has recently developed a new water soluble polymer EXCEVAL™, which is a system of PVOH. EXCEVAL™ has the following characteristics as a protective colloid for PVAc emulsion.