| 摘要 |
A polyoxymethylene of high molecular weight is prepared by polymerizing trioxane by bulk polymerization in the absence of an inert solvent and in the presence of a cationic catalyst. Specified catalysts are borontrifluoride, stannic chloride, antimony pentachloride, methyl aluminium dichloride, methyl tin trichloride, an organo-aluminium or organo-tin compound in combination with an alpha-halogenated ether, saline compounds of halides of boron, iron, tin and antimony (but not antimony fluoride) where an aryldiazonium-fluoroborate is the preferred saline compound, an aryldiazonium salts. The catalyst may be diluted with an inert medium. |
