POLYPROPYLENE RESIN COMPOSITION AND EXPANDED MOLDING

WIPO Patent Application WO/2013/058255

A1

Provided is a polypropylene resin composition which has an excellent property of forming separated cells and an excellent extrusion property and enables the production of an expanded molding having a light weight, a rigid feeling and an excellent recycling property. The polypropylene resin composition is characterized by containing a component (A) as mentioned below in an amount of 70 to 100 wt%: component (A): which is composed of at least two components, i.e., a propylene-α-olefin copolymer (A1) fulfilling the requirements (A-1) to (A-3) mentioned below and a propylene homopolymer (A2), is produced by polymerizing the components (A1) and (A2) by a multi-stage polymerization method, contains the component (A1) at a content of 1 to 20 wt%, contains the component (A2) at a content of 99 to 80 wt%, has a melt flow rate of 5 to 20 g/10 minutes, and exhibits strain hardenability in an elongation viscosity measurement that is carried out at a temperature of 180˚C and a strain rate of 10 s-1. (A-1) The α-olefin content is 15 to 85 wt%. (A-2) The intrinsic viscosity (η) is 5 to 20 dl/g. (A-3) The Mw/Mn ratio is 5 to 15.

KANENO MOTOKI (JP)
YAMASHITA KOJI (JP)
TSUJI HIROSHI (JP)
SUZUKI AKIHIRO (JP)
KITADE SHINICHI (JP)
AOKI MASARU (JP)
TERAYAMA ISAMU (JP)

PCT/JP2012/076762

April 25, 2013

October 17, 2012

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JAPAN POLYPROPYLENE CORP (JP)

C08L23/12; B29C48/10; B29C48/305; B29C48/92; B29C49/04; B29C51/02; C08F210/06; C08J9/04; C08L23/14; B29K23/00; B29K105/04

JP2010121053A	2010-06-03
JP2009299029A	2009-12-24
JP2010121054A	2010-06-03
JP2009132893A	2009-06-18
JP2009275117A	2009-11-26
JP2009108229A	2009-05-21

KAWABI Kenji (JP)
Kenji Kawabi (JP)

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