The present invention provides a method of manufacturing, a stabilized polyacetal resin, comprising the step of applying a heat treatment to a polyacetal resin having an unstable terminal group in the presence of an unstable terminal group decomposer selected from the following Group I, Group II and Group III, thereby decreasing the unstable terminal group:
unstable terminal group decomposer of Group I:
(I) a quaternary ammonium salt of an acidic cyclic amide compound,
unstable terminal group decomposer of Group II:
(II) a quaternary ammonium salt of a polycarboxylic acid intramolecularly having four or more carboxyl groups and/or a quaternary ammonium salt of an aminocarboxylic acid intramolecularly having one or more carboxyl group(s),
unstable terminal group decomposer of Group III:
(III) a quaternary ammonium salt, wherein a compound providing a counter-anion of a quaternary ammonium salt is at least one selected from the group consisting of the following (i) to (v):
(i) a carbonic acid monoester and/or a metal bicarbonate,
(ii) an acidic enol-based compound,
(iii) a phenol-based and/or an alcohol-based compound,
(iv) an acidic azole-based compound, and
(v) at least one non-carboxylic acid-based compound selected from the group consisting of an organic sulfur compound, an organic phosphorus compound and an organic boron compound.
本发明提供了一种制造稳定聚
缩醛树脂的方法,包括以下步骤:在不稳定端基分解剂存在的情况下,对具有不稳定端基的聚
缩醛树脂进行热处理,不稳定端基分解剂选自以下第 I 组、第 II 组和第 III 组,从而减少不稳定端基: 第 I 组的不稳定端基分解剂:(I) 酸性环酰胺化合物的季
铵盐、
组 II 的不稳定基团分解剂:(II) 分子内具有四个或四个以上羧基的聚
羧酸季
铵盐和/或分子内具有一个或一个以上羧基的
氨基
羧酸季
铵盐、
第 III 组不稳定的末端基团分解物: (III) 季
铵盐,其中提供季
铵盐反离子的化合物至少选自以下(i)至(v)组中的一种:
(i)
碳酸单酯和/或
金属
碳酸氢盐,(ii) 酸性烯醇基化合物,(iii)
苯酚基和/或醇基化合物,(iv) 酸性唑基化合物,以及 (v) 至少一种选自
有机硫化合物、有机
磷化合物和有机
硼化合物的非
羧酸基化合物。