PRODUCTION OF POLYACETAL RESIN

PROBLEM TO BE SOLVED: To produce a polyacetal copolymer having high quality in high yield by smoothly transferring a slurry part and suppressing the elevation of the inside temperature of a reactor attributable to polymerization heat generation. SOLUTION: This is a method for producing a polyacetal resin by the continuous block polymerization of trioxane with a cyclic ether which is carried out by using a self cleaning-type continuous stirring mixer consisting of two or more parallel axes which rotate in the direction same to or different from each other, plural paddles attached to each of the axes, a body which locates closely to the periphery of the paddles, a raw material inlet located near one end of the axes and an outlet located near the other end of the axes for discharging the reaction product. In this process, the continuous stirring mixer is placed in such a state where the axes are tilted by 1-10 deg. to the horizontal direction by lifting the raw material inlet side.