Document Type and Number:
Japanese Patent JPS6248962
Kind Code:
B2
Abstract:
A polypropylene (PP) having a superior post-processability and blow moldability is provided, which PP is obtained by polymerizing propylene at multiple stages using a catalyst comprising a TiCl3 composition, an organoaluminum compound and a molecular weight (M.W.) modifier, the resulting final polymer comprising a higher M.W. portion and a lower M.W. portion having a melt flow index of 0.03 to 2.0 g/10 min., and between this index and a melt flow index (10.2 kg/10 minutes, 230 DEG C.) as measured under 5 times the load applied in the measurement of the former melt flow index, there being a relationship log HMI>/=0.922 log MI+1.44, and the final polymer consisting of 40 to 60 weight % of a PP portion corresponding to the higher M.W. portion and 60 to 40 weight % of a PP portion corresponding to the lower M.W. portion.
Inventors:
CHIBA HIROMASA
KOHAMA KENJIRO
KAWAZOE SHUNJI
OKA TAKAHIRO
SATO TERUHIRO
KOHAMA KENJIRO
KAWAZOE SHUNJI
OKA TAKAHIRO
SATO TERUHIRO
Application Number:
JP8444782A
Publication Date:
October 16, 1987
Filing Date:
May 19, 1982
Export Citation:
Assignee:
CHISSO CORP
International Classes:
C08F2/00; C08F8/00; C08F10/06; C08F297/00; C08F297/08; C08F110/06; C08F210/06
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