| 摘要 |
<p>The purpose of the present invention is to provide a high-quality polyacetal copolymer economically advantageously by a simple process. The present invention comprises: a raw material supply step (S1) of supplying a raw material comprising trioxane, a comonomer capable of copolymerizing with trioxane and a non-volatile protonic acid to a reactor of a continuous stirring/mixing machine type; a polymerization reaction step (S2) of carrying out a polymerization reaction of the raw material to produce a reaction mixture; an unreacted monomer re-supply step (S3) of vaporizing an unreacted monomer to separate the unreacted monomer from the reaction mixture and supplying the unreacted monomer to the raw material supply step; a polyacetal copolymer collection step (S4) of collecting a polyacetal copolymer from the reaction mixture into a collection unit which is arranged downstream from a discharge port and is so adjusted as to have a gauge pressure of 0.2 kPa or more; and a deactivation step (S5) of adding a basic compound to the polyacetal copolymer that has been collected in the polyacetal copolymer collection step and then subjecting the resultant mixture to a melt-kneading treatment to deactivate the non-volatile protonic acid.</p> |
