Title:
LOW CRYSTALLINE POLYPROPYLENE
Document Type and Number:
Japanese Patent JP3737620
Kind Code:
B
Abstract:
PROBLEM TO BE SOLVED: To provide a low crystalline polypropylene which shows excellent flexibility, transparency, shock resistance and thermal stability and gives good formability.
SOLUTION: A homopolymer of propylene or a copolymer of propylene and not more than 5 mol.% of α-olefin other than propylene shows a melt flow rate of 1-20 g/10 min and molecular weight distribution (Mw/Mn) represented by a ratio of weight average molecular weight to number average molecular weight of 4-15. When the polymer is fractionated by temperature increasing elution fractionation to give an elution curve represented by a vertical axis of elution temperatures and a transverse axis of accumulated weight ratio of eluted components, the amount of eluted component (component A) at temperatures less than 20°C is 5-35 weight %, the amount of eluted component (component B) at temperatures from 20°C to less than 100°C is 10-40 weight %, the amount of eluted component (component C) at temperatures not less than 100°C is 40-80 weight % and the sum of the components A, B and C is 100 weight %, satisfying that a weight ratio of the component B to the component A (B/A) is not less than 0.6 and a peak top temperature of the component C is not less than 120°C.
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Inventors:
Fujii, Junichi
Kitajima, Yoshiyuki
Kitajima, Yoshiyuki
Application Number:
JP1997000346892
Publication Date:
November 04, 2005
Filing Date:
December 16, 1997
Export Citation:
Assignee:
TOKUYAMA CORP
International Classes:
C08F10/06; C08J5/18; C08F4/658; C08F10/00; C08J5/18; C08F4/00; (IPC1-7): C08F10/06; C08J5/18