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    • 8. 发明授权
    • Process for the preparation of fluorocarbon polymers containing carboxyl
groups, and certain starting materials required for this, and the
fluoro-sulfato compounds formed as intermediate products in the process
    • 制备含有羧基的氟碳聚合物的方法,以及所需的某些原料以及在该方法中形成为中间产物的氟 - 硫酸酯化合物
    • US4471076A
    • 1984-09-11
    • US467179
    • 1983-02-16
    • Peter BlickleJohannes BrandrupHans MillauerWerner SchwertfegerG/u/ nter Siegemund
    • Peter BlickleJohannes BrandrupHans MillauerWerner SchwertfegerG/u/ nter Siegemund
    • C08F8/12B01J39/20C08F8/34
    • C08F8/12C08F2800/10
    • Substantially non-crosslinked fluorocarbon polymers containing carboxyl groups are prepared starting from non-crosslinked and in some cases new, fluorocarbon polymers in which the linear macromolecules carry side chains containing the end group --CHFX (X is F or CF.sub.3). The starting polymers are first reacted with peroxodisulfuryl difluoride FSO.sub.2 O--OSO.sub.2 F to give the corresponding fluorosulfato derivatives containing the side chain end groups. ##STR1## In the event that X is F, these derivaties are then converted into the corresponding carboalkoxy derivatives by means of an alcohol, the fluorosulfato group being split off, and these carboalkoxy derivatives are then converted by saponification into the products containing the free carboxyl groups; the fluorosulfato derivatives can also be hydrolyzed with water, if appropriate in the presence of an inert solvent and/or bases, to give, without further treatment, the products containing the free carboxyl groups.The fluorosulfato derivatives in which X is CF.sub.3 in the side chain end groups are first decomposed in the presence of catalytic amounts of alkali metal fluorides and/or aprotic nitrogen bases to give the products containing the side chain end groups ##STR2## and the latter are then hydrolyzed to give the products containing the free carboxyl group.Virtually non-crosslinked fluorocarbon polymers containing carboxyl groups are of industrial importance in the form of cation exchanger membranes in electrolytic cells, particularly in chlor-alkali electrolysis.
    • 含有羧基的基本上非交联的碳氟化合物聚合物是从非交联的,在某些情况下,新的含有端基-CHFX(X是F或CF 3)的侧链的大分子的氟碳聚合物开始制备的。 起始聚合物首先与过氧二硫代氟化二氟FSO 2 O-OSO 2 F反应,得到含有侧链端基的相应的氟代磺酰基衍生物。 (X是F或CF3)。 在X为F的情况下,这些衍生物然后通过醇转化成相应的烷氧基衍生物,将氟代磺酰基分解,然后将这些烷氧羰基衍生物通过皂化转化成含有游离羧基的产物; 如果在惰性溶剂和/或碱存在的情况下,氟磺酸衍生物也可以用水水解,得到含有游离羧基的产物,无需进一步处理。 在侧链端基中X为CF 3的氟代硫脲衍生物首先在催化量的碱金属氟化物和/或非质子氮碱的存在下分解,得到含有侧链端基的产物,并且后者为 然后水解,得到含有游离羧基的产物。 含有羧基的几乎不交联的碳氟化合物聚合物在电解槽中的阳离子交换膜的形式具有工业上的重要性,特别是在氯碱电解中。