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    • 3. 发明授权
    • Thermoplastic polyesters containing perfluoropolyoxyalkylene sequence
    • 含全氟聚氧化烯序列的热塑性聚酯
    • US5476910A
    • 1995-12-19
    • US228564
    • 1994-04-15
    • Stefano TurriGiuseppe GianottiMarinella LeviClaudio Tonelli
    • Stefano TurriGiuseppe GianottiMarinella LeviClaudio Tonelli
    • C08G63/66C08G63/672C08G63/682C08G65/32
    • C08G63/6826C08G63/672
    • Fluorinated thermoplastic elastomers having a block structure:--[--R.sub.f --H.sub.1 --H.sub.2 --H.sub.1 --]--where --R.sub.f -- is a perfluoropolyoxyalkylene sequence of formula:--CF.sub.2 O--(CF.sub.2 CF.sub.2 O).sub.m --(CF.sub.2 O).sub.n --CF.sub.2 --with m/n=0.2.div.5, H.sub.1 and H.sub.2, equal or different from each other, are bivalent radicals having arylene, alkylarylene, alkylene or cycloalkylene structure, optionally containing fluorine and/or other heteroatoms selected among oxygen, sulphur, nitrogen. Such products are obtainable by utilizing a perfluoropolyoxyalkylene diol having a functionality at least equal to 1.97, preferably at least equal to 1.99, and are characterized by a tensile strength at 23.degree. C. at least 50% higher than that of the corresponding polyesters obtained starting from perfluoropolyoxyalkylene diols having a functionality not higher than 1.96.
    • 具有嵌段结构的氟化热塑性弹性体:其中-Rf-是式-CF 2 O-(CF 2 CF 2 O)m - (CF 2 O)n -CF 2的全氟聚氧化烯序列,其中m- n = 0.2分解5,彼此相同或不同的H1和H2是具有亚芳基,烷基亚芳基,亚烷基或亚环烷基结构的二价基团,任选地含有选自氧,硫,氮中的氟和/或其它杂原子。 这样的产物可通过使用具有至少等于1.97,优选至少等于1.99的官能度的全氟聚氧亚烷基二醇获得,其特征在于在23℃下的拉伸强度比起始地获得的相应聚酯的拉伸强度高至少50% 来自具有不高于1.96的官能度的全氟聚氧亚烷基二醇。