Title:
【発明の名称】エチレン重合体の製造方法
Document Type and Number:
Japanese Patent JPH0725829
Kind Code:
B2
Abstract:
A process for preparing an ethylene polymer by a two-stage polymerization of ethylene or ethylene and an a-olefin in an inert hydrocarbon at 50-100°C using a coordination polymerization catalyst containing a solid component and an organoaluminum compound, said solid component containing a transition metal compound, which process comprises:(a) in a first stage, producing 10-90% by weight based on the total polymer quantity of a polymer having a melt index in the range of 0.0001 to 0.5 g/10 min as measured according to ASTM D 1238-73, Condition E, using as said solid component a solid product obtained by supporting chromium trioxide or a compound which on calcining forms chromium oxide at least partially, on an inorganic oxide carrier followed by calcining, and using as said organoaluminum compound a compound of the general formulawherein R is a hydrocarbon radical having 1 to 18 carbon atoms and n is 2 5 n ≦ 100; and(b) in a second stage, producing 90-10% by weight based on the total polymer quantity of a polymer having a melt index in the range of 0.01 to 50 g/10 min as measured according to ASTM D 1238-73, Condition E, using as said solid component a solid material containing at least magnesium and titanium, and using as said organoaluminum compound a compound of the general formula AIR'pX3-P wherein R' is a hydrocarbon radical having 1 to 20 carbon atoms, X is halogen and/or alkoxy and p is 0 < p ≦ 3, in the presence of the polymer obtained in the first stage.Alternatively the solid component of (a) also contains magnesium and titanium and step (b) is effected simply by adding the compound of the formula AIR'pX3-p after completion of the first stage polymerisation.
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Inventors:
Yoshio Tajima
Kazutoshi Nomiyama
Kindaiya Sadan
Nobuyuki Kuroda
Kazuo Matsuura
Kazutoshi Nomiyama
Kindaiya Sadan
Nobuyuki Kuroda
Kazuo Matsuura
Application Number:
JP4852586A
Publication Date:
March 22, 1995
Filing Date:
March 07, 1986
Export Citation:
Assignee:
Nippon Oil Co., Ltd.
International Classes:
C08F2/14; C08F4/60; C08F4/62; C08F4/64; C08F10/00; C08F10/02; C08F110/02; C08F210/16; (IPC1-7): C08F10/02; C08F4/64
Attorney, Agent or Firm:
Takehiko Saito