公开(公告)号：US5639822A

公开(公告)日：1997-06-17

申请号：US355307

申请日：1994-12-12

申请人： Klaus-Dieter Hungenberg ,  Harald Schwager ,  Klaus Dieter Ruempler ,  Patrik Mueller

发明人： Klaus-Dieter Hungenberg ,  Harald Schwager ,  Klaus Dieter Ruempler ,  Patrik Mueller

IPC分类号： C08F2/34 ,  C08F2/38 ,  C08F4/642 ,  C08F4/646 ,  C08F210/06 ,  C08F297/08

CPC分类号： C08F297/083 ,  C08F210/06

摘要： High-flow propylene/ethylene copolymers which have a melt flow index of from 2 to 200 g/min under a load of 2.16 kg at 230.degree. C. and which may be produced from the gas phase by polymerization in two stages in an agitated fixed bed in the presence of hydrogen acting as chain stoppage regulator and using a Ziegler-Natta catalyst system comprising a titaniferous solid component which contains a magnesium compound on finely divided silicon oxide or on finely divided aluminum oxide or on a finely divided aluminum silicate having the empirical formula SiO.sub.2.aAl.sub.2 O.sub.3, where a stands for a value between 0.001 and 2, and an aluminum component, by means of a procedure comprisinga) a first polymerization stage in which propylene is polymerized under a pressure of from 20 to 40 bar and at a temperature of from 60.degree. to 90.degree. C., the ratio of the partial pressure of the hydrogen to that of the propylene being adjusted to from 1:100 to 10:100, followed byb) a second polymerization stage, which consists in the polymerization, at a temperature of from 40.degree. to 100.degree. C., of a mixture of propylene and ethylene and the addition thereof, in the form of polymerized units, to the polypropylene produced in the first polymerization stage, the pressure in this second polymerization stage being from 10 to 30 bar and at least 7 bar lower than that used in the first polymerization stage, while the ratio of the partial pressure of the hydrogen to that of the propylene is adjusted to from 2:100 to 12:100 and the ratio of the weight of monomer converted in the first stage to that of monomer converted in the second stage is kept within the range of 1:1 to 20:1.

摘要翻译： 高流动性丙烯/乙烯共聚物，其在230℃负载2.16kg时的熔体流动指数为2〜200g / min，可以通过在搅拌固定 在作为链停止调节剂的氢气存在下，使用齐格勒 - 纳塔催化剂体系，其包含含钛固体组分，其在细碎的氧化硅上或在细碎的氧化铝上或在具有经验的细碎的硅酸铝上含有镁化合物 其中a表示0.001和2之间的值，以及铝组分，通过包括以下步骤的方法：a）第一聚合阶段，其中丙烯在20至40巴的压力下聚合， 温度为60℃至90℃，氢气与丙烯的分压比为1:100至10：100，接着是b）第二聚合阶段，其中con 在40至100℃的温度下聚合丙烯和乙烯的混合物，并将其以聚合单元的形式加入到在第一聚合阶段中生产的聚丙烯中， 该第二聚合阶段为10至30巴，比第一聚合阶段中使用的低至少7巴，而氢与丙烯分压的比例调节至2：100至12： 100，第一阶段中转化的单体重量与在第二级转化的单体的重量比保持在1:1至20:1的范围内。