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    • 32. 发明授权
    • Fluoroelastomers endowed with improved processability and process for
preparing them
    • 氟弹性体具有改进的加工性和制备它们的方法
    • US5219964A
    • 1993-06-15
    • US925845
    • 1992-08-07
    • Margherita AlbanoGiulio BrinatiVincenzo ArcellaEnzo Giannetti
    • Margherita AlbanoGiulio BrinatiVincenzo ArcellaEnzo Giannetti
    • C08F4/08C08F214/22C08F214/26
    • C08F214/22C08F214/26
    • Fluoroelastomers characterized by the presence of iodine or bromine atoms at the end of the polymeric chain in an amount equal to or lower than 1 iodine or bromine atom per polymeric chain, and by a bromine content in the chain ranging from 0.05 to 2% by weight referred to the total weight of the monomeric units.Said fluoroelastomers exhibit improved characteristics of processability, particularly as regards the utilization in injection molding processes and the detaching from the molds, as well as of stability to heat.A process for preparing fluoroelastomers containing iodine or bromine atoms at the ends of the polymeric chain, in an amount equal to or lower than 1 iodine or bromine atom per polymeric chain, which process comprises polymerizing mixes of fluorinated monomers (VDF, TFE, HFP, FVE) in bulk, in suspension, in aqueous emulsion, or in solution of organic solvents by means of radical starters, in the presence of compounds capable of providing I.sup.- or Br.sup.- ions in the polymerization medium and conditions.
    • 其特征在于聚合物链末端存在碘或溴原子,其量为每个聚合物链等于或低于1个碘或溴原子,并且链中的溴含量为0.05-2重量% 指单体单元的总重量。 所述含氟弹性体表现出改进的加工性能,特别是关于注射成型工艺的利用和从模具的分离以及对热的稳定性。 在聚合物链的末端制备含有碘或溴原子的含氟弹性体的方法,其量等于或低于每个聚合物链1个碘或溴原子,该方法包括将氟化单体(VDF,TFE,HFP, FVE)在悬浮液中,在水性乳液中,或在有机溶剂的溶液中,通过自由基引发剂在能够在聚合介质和条件下提供I-或Br离子的化合物存在下进行。
    • 38. 发明授权
    • Fluoroelastomers
    • 氟弹性体
    • US07767763B2
    • 2010-08-03
    • US12161638
    • 2007-01-15
    • Francesco TriulziMargherita AlbanoMilena Stanga
    • Francesco TriulziMargherita AlbanoMilena Stanga
    • C08F14/18
    • C08F214/22C08F214/225C08F216/1408C08F236/20
    • VDF-based curable fluoroelastomers, having a glass transition temperature lower than −49° C., preferably lower than −50° C., and having the following composition, as percent moles: A) from 25% to 50%, preferably from 30% to 45%, of the monomer of formula: CF2═CFOCF2OCF3 (a); B) one or more (per)fluorinated comonomers having at least one unsaturation of ethylene type in amounts from 75% to 50%; preferably from 70% to 55%; said one or more comonomers comprising vinylidene fluoride (VDF) in amounts from 50% to 75% on the total of the monomer moles; the sum of the molar percentages of the monomers being 100%; said fluoroelastomers containing an amount of —COF end groups in the polymer lower than the sensitivity limit of the method reported in the description.
    • 玻璃化转变温度低于-49℃,优选低于-50℃,具有以下组成,以摩尔百分比计的VDF基可固化含氟弹性体:A)25%-50%,优选30 %〜45%的式:CF2 = CFOCF2OCF3(a)的单体; B)一种或多种具有75%至50%的乙烯类型的至少一种不饱和度的(全)氟化共聚单体; 优选70%至55%; 所述一种或多种共聚单体包含单体摩尔数总计为50%至75%的偏二氟乙烯(VDF); 单体的摩尔百分比之和为100%; 所述含氟弹性体在聚合物中含有一定量的-COF端基,低于说明书中报道的方法的灵敏度极限。