Abstract
The effect of polyvinyl alcohol (PVA) added before polymerization on the particles, viscosity of polyvinyl acetate (PVAc) emulsion and the stability of PVAc emulsion against sodium sulfate were studied. PVAc emulsion used partially saponified PVAc which was obtained by ordinary alkali saponification of PVAc in methanol had the smaller particles, the higher viscosity and the more excellent stability against sodium sulfate in compared with PVAc emulsion which par fectly saponified PVAc and partially acetylated PVA were used. These effect of partially saponified PVAc exhibited more remarkably as the residual acetyl content were increased and the residual acetyl groups were maldistributed in a polymer chain.
