Title:
PRODUCTION OF POLYOLEFIN
Document Type and Number:
Japanese Patent JPH0418407
Kind Code:
A
Abstract:
PURPOSE:To obtain the subject polymer for a large scale blow molding having excellent resistance to draw down by polymerizing ethylene, etc., in a specific condition using a catalyst comprising a reaction product of an organic compound of Mg and Ti containing oxygen with an Al-halide compound and an organic Al. CONSTITUTION:Ethylene or ethylene and another alpha-olefin are polymerized in a hydrocarbon solvent using catalytic system composed of a reaction product of an organic compound of Mg containing oxygen, an organic compound of Ti containing oxygen and an Al-halide compound and an organic Al compound at 45-100 deg.C. In said process, the polymerization is performed in two stages, namely, (A) ethylene is polymerized in the presence of hydrogen in a molar ratio of 0.1-4 to ethylene in vapor phase to generate a polymer having 6X10<4>-15X10<4> viscosity-average molecular weight in an amount of 80-95wt.% of the total in one stage and (B) ethylene or ethylene and another olefin are polymerized in the presence of hydrogen in a molar ratio of 0.005-0.5 to ethylene to generate a polymer having 20X10<4>-400X10<4> viscosity-average molecular weight in an amount of 5-20wt.% of the total to afford a polymer having a ratio of molecular weight: B/A=3-30 and <=0.1/10min melt index.
Inventors:
UEHARA YUMITO
NISHIHARA YASUHIRO
TANAKA MASAHITO
NISHIHARA YASUHIRO
TANAKA MASAHITO
Application Number:
JP12097890A
Publication Date:
January 22, 1992
Filing Date:
May 10, 1990
Export Citation:
Assignee:
MITSUBISHI CHEM IND
International Classes:
C08F2/00; C08F4/60; C08F4/658; C08F10/00; C08F10/02; C08F210/16; (IPC1-7): C08F10/02
Attorney, Agent or Firm:
Hasegawa Soji
Next Patent: JPH0418408