| 摘要 |
1353535 Fluorocarbon polymers FARBWERKE HOECHST AG 22 July 1971 [25 July 1970] 34371/71 Heading C3P Ethylene is copolymerized with a fluoroolefin in an aqueous acidic medium at 0-25 atmospheres gauge pressure using as catalyst a manganese acid or manganese acid salt or a precursor therefor. In examples ethylene was copolymerized with tetrafluoroethylene, trifluorochloroethylene, trifluorochloroethylene and tetrafluoroethylene, vinyl fluoride and tetrafluoroethylene, or trifluorochloroethylene, or vinylidene fluoride and tetrafluoroethylene or trifluorochloroethylene using as catalyst potassium permanganate or manganate, or permanganic acid dihydrate. The polymerization medium was kept alkaline either by using a buffer such as ammonium chloride, nitrate or perfluorooctanoate or using acidic emulsifiers such as C 6 -C 10 perfluoroalkyl phosphonic acids or perfluorooctanoic acid. Diethylene glycol may be added as a regulator. |
