The present invention provides a process for preparing a fluorine-containing elastomer in a high productivity comparable to that of non-iodine transfer polymerization process by carrying out an iodine transfer polymerization at high pressure. The present invention also provides a fluorine-containing elastomer prepared by this process, and fluorine-containing molded articles. The process is a batch copolymerization process conducted under conditions that the reduced temperature of the critical constant is at least 0.95 and the reduced pressure of the critical constant is at least 0.80 wherein the reduced temperature and the reduced pressure are calculated using the Peng-Robinson formula from the critical temperature, the critical pressure and the composition ratio of each of the monomers in the gaseous phase in a reaction vessel,
in which ethylenically unsaturated compounds containing at least one fluoroolefine are copolymerized in the presence of a compound having the formula: R
f
1
·I
x
wherein R
f
1
is a saturated or unsaturated fluorohydrocarbon or chlorofluorohydrocarbon group having 1 to 16 carbon atoms, and x is the number of bonds of R
f
1
and an integer of 1 to 4.
本发明提供了一种通过在高压下进行
碘转移聚合制备含
氟弹性体的工艺,其生产率与非
碘转移聚合工艺相当。本发明还提供了一种通过该工艺制备的含
氟弹性体和含
氟模塑制品。该工艺是在临界常数的降低温度至少为 0.95 和临界常数的降低压力至少为 0.80 的条件下进行的批量共聚工艺,其中降低温度和降低压力是根据临界温度、临界压力和反应容器中气相中每种单体的组成比例,用彭-罗宾逊公式计算得出的、
其中含有至少一种
氟烯烃的
乙烯基不饱和化合物在具有以下式子的化合物存在下共聚:R
f
1
-I
x
其中 R
f
1
是具有 1 至 16 个碳原子的饱和或不饱和
氟烃或
氯氟烃基团,x 是 R f 1 的键数。
f
1
是 1 至 4 的整数。