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Title:
PRODUCTION OF ETHYLENE POLYMER COMPOSITION
Document Type and Number:
Japanese Patent JPS5610506
Kind Code:
A
Abstract:

PURPOSE: To produce, with good reproducibility, a fisheye-free polymer composition having excellent processability, impact resistance, etc., by effecting multistage polymerization or copolymerization of ethylene with other olefins by use of a specific high-activity transition metal catalyst and specific conditions.

CONSTITUTION: A composition of a nonelastomeric polymer having as an average, an intrinsic viscosity [η] of 1W6 and an α-olefin content of 0.2W20wt% is produced by the steps of: (step a) producing a polymer or copolymer having an α- olefin content of below 15wt% and an [η] of 0.3W3, by polymerizing ethylene or copolymerizing ethylene with other α-olefins, by use of a catalyst having a polymer yield per unit of transition metal, of at least 250mol. atom. hr. ethylene pressure (Hg/cm2) and (step b) producing an ethylene copolymer having an α-olefin content of 0.2W30wt% and an intrinsic viscosity which is at least 1.5 times that of the step a polymer, by copolymerizing ethylene with other α-olefins in the presence of the step a polymer, said steps a and b are carried out so that the ratio of step a polymer to step b polymer is 30W60/40W70.


Inventors:
MORITA TOMONORI
KASHIWA NORIO
Application Number:
JP1979000085861
Publication Date:
February 03, 1981
Filing Date:
July 09, 1979
Export Citation:
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Assignee:
MITSUI PETROCHEMICAL IND
International Classes:
C08F2/00; C08F4/64; C08F10/00; C08F10/02; C08F210/16; C08F255/02; C08F297/08; C08L23/00; C08L23/08; (IPC1-7): C08F2/00; C08F4/64; C08F10/02
Domestic Patent References:
JPS4842716A1973-06-21
JPS4329956Y11968-12-07
JPS5147079A1976-04-22
JPS5219788A1977-02-15
JPS54100444A1979-08-08
JPS46639A
JPS53132082A1978-11-17
JPS5560543A1980-05-07
JPS55164205A1980-12-20
JPS51137783A1976-11-27
JPS56815A1981-01-07
Foreign References:
DE2826548A11979-01-04
US3392213A1968-07-09
US3592880A1971-07-13