HIGHLY CRYSTALLINE POLYPROPYLENE - JAPAN POLYOLEFINS CO LTD

Title:

HIGHLY CRYSTALLINE POLYPROPYLENE

Document Type and Number:

WIPO Patent Application WO/1998/004600

Kind Code:

A1

Abstract:

A highly crystalline polypropylene characterized by having a crystallinity of not less than 50.5 % as calculated from the heat of melting and satisfying a requirement represented by the formula (II) regarding the relationship between the weight average molecular weight Mw and the proportion f(R) of R-lamellae in spherulites calculated by the following equation (I) from the birefringence $g(D)n of the spherulites crystallized by melting the polypropylene at 230 �C for 5 min, cooling the melt to 132 �C at a temperature fall rate of 20 �C/min, and holding the polypropylene at that temperature for 90 min to crystallize the polypropylene. Moldings of this polypropylene or resin compositions comprising the same have excellent rigidity, heat resistance, scratch resistance, and dimensional stability, are less likely to emit odor at the time of molding, and hence can be widely used for various applications. f(R) = (-$g(D)n + 0.0351) x 100/0.0528 ... (1), f(R) > -2.5 x (log{Mw} - 4)?2� + 88.9 ... (2)

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Inventors:

YAMADA KOJI (JP)
IWASAKI YOSHIHARU (JP)

Application Number:

PCT/JP1997/002659

Publication Date:

February 05, 1998

Filing Date:

July 31, 1997

Export Citation:

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Assignee:

JAPAN POLYOLEFINS CO LTD (JP)
YAMADA KOJI (JP)
IWASAKI YOSHIHARU (JP)

International Classes:

C08F10/06; C08F110/06; C08L23/04; C08L23/06; C08L23/08; C08L23/10; C08L23/12; C08F210/06; C08L23/16; C08L53/00; (IPC1-7): C08F10/06; C08J5/00; C08L23/10

Foreign References:

JPH07206923A	1995-08-08
JPH08198979A	1996-08-06

Other References: