| 摘要 |
A process for producing a polyoxymethylene copolymer reduced in formaldehyde gas generation in a molding machine. The process, which is for continuously producing a polyoxymethylene copolymer, comprises melt-kneading a crude polyoxymethylene copolymer at a temperature not lower than the melting point thereof, volatilizing/removing under vacuum the formaldehyde gas generated by decomposition, subsequently mixing the copolymer with a formaldehyde scavenger containing a hydrazide compound (A) while keeping the copolymer in a molten state, and immediately palletizing the mixture. As the formaldehyde scavenger is used a dispersion obtained by slurry-dispersing the compound (A) in a diluent (B) having a melting point lower than the temperature (Ta) which is the lower of the melting point and decomposition temperature of the compound (A), at a temperature which is not lower than the melting point of the diluent (B) and is lower than the temperature (Ta). |
