POLYPROPYLENE BLOCK COPOLYMER, ITS USE, AND POLYPROPYLENE RESIN COMPOSITION COMPRISING SAID POLYPROPYLENE BLOCK COPOLYMER

Title:

POLYPROPYLENE BLOCK COPOLYMER, ITS USE, AND POLYPROPYLENE RESIN COMPOSITION COMPRISING SAID POLYPROPYLENE BLOCK COPOLYMER

Document Type and Number:

WIPO Patent Application WO/2006/075637

Kind Code:

A1

Abstract:

This invention provides a molded product appearance improver for a resin, which can regulate the appearance of a large-size molded component by incorporating it in a small amount, and a polypropylene resin composition, using the appearance improver, which can develop a good appearance, for example, in automotive exterior components and has excellent moldability. There is also provided a propylene block copolymer comprising a crystalline propylene polymer moiety and a propylene-ethylene random copolymer moiety. The intrinsic viscosity [&eegr ]_homo of the crystalline propylene polymer moiety is not more than 1.2 dl/g. The propylene-ethylene random copolymer moiety has an ethylene content of 30 to 70% by weight and an intrinsic viscosity [&eegr ]_copoly of 2.5 to 7.0 dl/g and occupies 40 to 80% by weight of the whole propylene block copolymer. The whole propylene block copolymer has an MFR value of 0.1 to 10 g/10 min and a [&eegr ]_copoly/[&eegr ]_homo value of 2.5 to 10. The polypropylene resin composition contains the propylene block copolymer as a molded product appearance improver.

Inventors:

SUZUKI AKIHIRO
MIZUKAMI SHIGEO
ZANKA YUKIHITO

Application Number:

PCT/JP2006/300247

Publication Date:

July 20, 2006

Filing Date:

January 12, 2006

Export Citation:

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Assignee:

JAPAN POLYPROPYLENE CORP (JP)
SUZUKI AKIHIRO
MIZUKAMI SHIGEO
ZANKA YUKIHITO

International Classes:

C08F210/16; C08F297/08; C08L53/00

Foreign References:

JPH07286022A	1995-10-31
JPS57111307A	1982-07-10
JPH09169826A	1997-06-30
JPH05194685A	1993-08-03
JPS57185304A	1982-11-15

Other References: