| 摘要 |
PURPOSE:To obtain a highly heat-resistant fluorine-containing copolymer resin inexpensively in good yield, by performing the aqueous suspension polymerization of tetrafluoroethylene and a fluorinated alkyl vinyl ether in the presence of a specified polymerization initiator in a mixed medium comprising water and a chlorofluorohydrocarbon. CONSTITUTION:The aqueous suspension polymerization of tetrafluoroethylene and 0.1-5mol% fluorinated alkyl vinyl ether of formula I (wherein X is H or F, x is 0-4 and y is 0-7) is performed at 30-80 deg.C in the presence of a polymerization initiator of formula II (wherein n is 2-4) and, optionally, a chain transfer agent (e.g., CCl4) in a mixed medium comprising water and a chlorofluorohydrocarbon (e.g., CCl2FCClF2) at a weight ratio of 1:2.5-0.25.
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