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.

• In the polymerization process;
• - Excellent emulsifying power,
• - Excellent polymerization stability,
   

• Performance of the emulsion;
• - Higher water resistance,
• - Excellent storage stability at low              temperature,
• - Lower stuctural viscosity,
• - Excellent adhesive properties for              wood and paper