POLYOLEFIN COMPOSITE FILM - MITSUI CHEMICALS INC

Title:

POLYOLEFIN COMPOSITE FILM

Document Type and Number:

WIPO Patent Application WO/2012/063914

Kind Code:

A1

Abstract:

The purpose of the present invention is to provide a polyolefin composite film with excellent low-temperature heat sealability, heat-seal strength, and transparency. The disclosed polyolefin composite film has at least a surface layer (i), an intermediate layer (iii), and a core layer (ii), and is characterized by: the surface layer (i) comprising 0-50 wt% of a specified propylene/α-olefin random copolymer (A) and/or a specified 1-butene/α-olefin copolymer (E), and 50-100 wt% of a propylene polymer (B) with a fusion point of 120-170°C (provided the total of (A), (E), and (B) in the surface layer is defined as 100 parts by weight); the core layer (ii) comprising 70-100 wt% of a crystalline polypropylene (C) with a fusion point of 150-170°C, and 0-30 wt% of the specified propylene/α-olefin random copolymer (A) (provided the total of (C) and (A) in the core layer is defined as 100 parts by weight); and the intermediate layer (iii) comprising a propylene resin composition comprising 50-95 wt% of the crystalline polypropylene (C) with a fusion point of 150-170°C and 50-5 wt% of the propylene polymer (B) with a fusion point of 120-170°C, the specified propylene/α-olefin random copolymer (A), and/or the specified 1-butene/α-olefin copolymer (E) (provided the total of (C), (B), (A), and (E) in the intermediate layer is defined as 100 parts by weight).

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Inventors:

AKAI IKUO (JP)
ABE TOMOHIRO (JP)
KUROKI TAKAYUKI (SG)

Application Number:

PCT/JP2011/075984

Publication Date:

May 18, 2012

Filing Date:

November 10, 2011

Export Citation:

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Assignee:

MITSUI CHEMICALS INC (JP)
AKAI IKUO (JP)
ABE TOMOHIRO (JP)
KUROKI TAKAYUKI (SG)

International Classes:

B32B27/32; B65D65/40; C08F210/06

Foreign References:

JP2005305998A	2005-11-04
JP2006327183A	2006-12-07
JP2004167905A	2004-06-17
JP2009172845A	2009-08-06

Other References: