Title:
PROCESS FOR PREPARING PROPYLENE COPOLYMER
Document Type and Number:
WIPO Patent Application WO/1988/000599
Kind Code:
A1
Abstract:
A process for preparing a propylene copolymer having excellent flow properties with an MFR value of 10 g/10 min or above. This process comprises a first polymerization step composed of at least two stages and a subsequent polymerization step. An important point in this process is control of the limiting viscosity of a crystalline propylene polymer obtained in the first stage of the first polymerization step and that of a crystalline polymer obtained in the final stage.
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| JPS5465788 | PREPARATION OF COPOLYMER |
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Inventors:
KIOKA MAMORU (JP)
TOYOTA AKINORI (JP)
KASHIWA NORIO (JP)
TOYOTA AKINORI (JP)
KASHIWA NORIO (JP)
Application Number:
PCT/JP1987/000529
Publication Date:
January 28, 1988
Filing Date:
July 20, 1987
Export Citation:
Assignee:
MITSUI PETROCHEMICAL IND (JP)
International Classes:
C08F4/42; C08F4/64; C08F4/60; C08F10/06; C08F210/06; C08F297/08; C08L23/10; C08L23/16; (IPC1-7): C08F297/08
Foreign References:
| JPS59187043A | 1984-10-24 | |||
| JPS59206424A | 1984-11-22 | |||
| JPS60115610A | 1985-06-22 |
Other References:
See also references of EP 0276323A4
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