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    • 6. 发明授权
    • Catalysts for polymerizing alpha-olefins
    • 用于聚合α-烯烃的催化剂
    • US4315836A
    • 1982-02-16
    • US137256
    • 1980-04-04
    • Enrico AlbizzatiEnzo Giannetti
    • Enrico AlbizzatiEnzo Giannetti
    • C08F4/00C08F4/02C08F4/52C08F4/60C08F4/64C08F4/659C08F10/00C08F210/00
    • C08F4/022C08F10/00
    • New and improved catalysts for polymerizing alpha-olefins of formula CH.sub.2 .dbd.CHR in which R is a C.sub.1 to C.sub.6 alkyl, more particularly propylene, mixtures of the alpha-olefins, and mixtures thereof with ethylene are disclosed. The catalysts are prepared from Al alkyl compounds and a solid product including a Mg dihalide and reaction products of said halide with at least one Ti compound and an electron donor compound which is an ester of an organic or inorganic oxygenated acid.The improvement consists in providing catalysts prepared from components (a) and (b) as defined infra and component (b) of which includes an alkyl Al compound as defined in (b) in amounts equal to molar ratios between the alkyl Al compound and the Ti compound of component (a) in the range of from 1 to 30, preferably from 2 to 20, and in which if the alkyl Al compound is complexed with an electron donor compound, the latter is used in reduced amounts such that at least 85% of the alkyl Al compound is in a form not combined with an electron donor compound, i.e., catalysts which are highly active and highly stereospecific but which involve a lower consumption of alkyl Al compound with respect to the Ti compound than has been required in the case of various prior art catalysts and which make it possible to use a lower amount of electron-donor compound complexed with the Al alkyl compound.
    • 公开了用于聚合式CH 2 = CHR的α-烯烃的新的和改进的催化剂,其中R是C1至C6烷基,更特别是丙烯,α-烯烃的混合物及其与乙烯的混合物。 催化剂由Al烷基化合物和包含二卤化镁的固体产物和所述卤化物与至少一种Ti化合物和作为有机或无机氧化酸的酯的电子给体化合物的反应产物制备。 改进之处在于提供由下文定义的组分(a)和(b)制备的催化剂,组分(b)包括如(b)中所定义的烷基铝化合物,其量等于烷基铝化合物与 组分(a)的Ti化合物在1至30,优选2至20的范围内,并且其中如果烷基Al化合物与电子给体化合物络合,则后者以减少的量使用,使得至少85 烷基铝化合物的%为不与电子给体化合物组合的形式,即,高活性和高立体特异性但涉及相对于Ti化合物的烷基Al化合物的消耗量低于在 各种现有技术催化剂的情况,并且可以使用较少量的与Al烷基化合物络合的电子给体化合物。
    • 7. 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。