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    • 1. 发明公开
    • 폴리옥시메틸렌 공중합체의 제조방법
    • 生产聚甲基苯乙烯共聚物的方法
    • KR1020080013859A
    • 2008-02-13
    • KR1020077023299
    • 2006-04-10
    • 미츠비시 가스 가가쿠 가부시키가이샤
    • 나가이사토시오카무라아키라스나가다이스케
    • C08G2/18C08G2/06C08G2/28
    • C08G2/28
    • 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).
    • 一种生产聚甲醛共聚物的方法,其减少了成型机中甲醛气体的产生。 用于连续生产聚甲醛共聚物的方法包括在不低于其熔点的温度下熔融捏合粗聚甲醛共聚物,在真空下挥发除去由分解产生的甲醛气体,随后将共聚物与甲醛 包含酰肼化合物(A)的清除剂,同时保持共聚物处于熔融状态,并立即堆垛混合物。 由于甲醛清除剂使用的是通过将化合物(A)在熔点低于化合物的熔点和分解温度较低的温度(Ta)的稀释剂(B)中分散而获得的分散体 A),在不低于稀释剂(B)的熔点并且低于温度(Ta)的温度下。