Patent ID: 9023287
Filing Date: 2015-05-05
Classification: C08F

Abstract:
1. A method of producing a polyvinyl alcohol resin, comprising: an introducing step of introducing a saponification catalyst to an introduction port, of which the size is 1/20 to ½ of the diameter of a channel, formed at the center of the channel for flow from top to bottom of a raw saponification solution containing a polyvinyl ester and an organic solvent; and a mixing step of mixing the raw saponification solution and the introduced saponification catalyst by static mixer, wherein the concentration of the polyvinyl ester in the raw saponification solution is 20 to 60 mass %, the viscosity is 0.01 to 30 Pa·s, and the saponification catalyst is introduced into the raw saponification solution to a catalyst concentration of 0.2 to 10 mass %.