PROCESS FOR PRODUCING POLYVINYL ESTER AND POLYVINYL ALCOHOL HAVING A HIGH DEGREE OF POLYMERIZATION

摘要

The present invention provides a process for producing easily on an industrial scale a polyvinyl ester having a high degree of polymerization and PVA having a high degree of polymerization derived by saponification from such a polyvinyl ester. The process of this invention makes it possible to produce the desired product especially even when the polymerization is carried out until a high conversion to polymer is attained, as well as even when the polymerization is terminated while the conversion to polymer is still low.