发明名称 |
Two step process for polymerizing ethylene |
摘要 |
Ethylene or a mixture of ethylene and a small amount of another alpha -olefin or diene is polymerized in two successive steps under different hydrogen partial pressures by polymerizing 30 to 70 wt. % of the ethylene or ethylene mixture to be polymerized in the presence of hydrogen at a molar ratio of ethylene or ethylene mixture to hydrogen of 1:1-8 in the first step and polymerizing the residual ethylene or the ethylene mixture at a molar ratio of ethylene to hydrogen of 1:0-0.3 in the second step, in the presence of the specific catalyst system comprising an organoaluminum compound (C) and a specific solid catalytic component (B) obtained by reacting a titanium or vanadium halogen-containing compound with a reaction product (A) obtained by reacting a Grignard reagent with a hydropoly-siloxane having the formula <IMAGE> (R1 represents an alkyl, aryl, aralkyl, alkoxy, or aryloxy group as a monovalent organic group; a is 0,1 or 2; b is 1, 2 or 3; and a+b</=3) or a silicon compound containing an organic group and hydroxyl group in the presence or absence of an aluminum-alkoxide, aluminum alkoxy-halide halide or a reaction product obtained by reacting the aluminum compound with water.
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申请公布号 |
US4357448(A) |
申请公布日期 |
1982.11.02 |
申请号 |
US19800151637 |
申请日期 |
1980.05.20 |
申请人 |
NISSAN CHEMICAL INDUSTRIES LTD. |
发明人 |
TSUBAKI, KAZUMI;MORINAGA, HIROSHI;MATSUO, YOSHIHO;IWABUCHI, TAKESHI |
分类号 |
C08F2/00;C08F2/04;C08F2/34;C08F4/00;C08F4/60;C08F4/62;C08F10/02;C08F110/02;C08F210/16;(IPC1-7):C08F4/66 |
主分类号 |
C08F2/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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