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Title:
POLYOLEFIN RESIN HEAT-SHRINKABLE MULTI-LAYER FILM
Document Type and Number:
Japanese Patent JP2003260764
Kind Code:
A
Abstract:

To provide a polyolefin resin heat-shrinkable multi-layer film having excellent properties of restoration from deformation in a range from a chilled zone of approximately 0°C to a refrigeration zone of approximately -10°C.

The polyolefin resin heat-shrinkable multi-layer film is composed of at least three layers, and its heat-shrinkage factor at 80°C is 20-50%. The film has following characteristics as described from (1) to (3). (1) A peak temperature of tanδ of the film measured by dynamic viscoelasticity measurement is -10 to 2°C. (2) In a secondary melting behavior of the film measured by a differential scanning calorimeter (DSC), a peak is at least in a range of 155°C±15°C, and a heat of crystal fusion at 125°C or higher is 10 to 20 J/g. (3) A lengthwise tear strength of the film is at least 0.05 N or greater, and a ratio of lengthwise and widthwise tear strength is lengthwise/widthwise = 1.2 to 5.0 times.


Inventors:
YOSHINO MASAYUKI
OGIUE HIDEKI
Application Number:
JP2002062222A
Publication Date:
September 16, 2003
Filing Date:
March 07, 2002
Export Citation:
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Assignee:
ASAHI KASEI CORP
International Classes:
B32B27/32; B29C61/06; B29K23/00; B29K105/02; B29L7/00; B29L9/00; (IPC1-7): B32B27/32; B29C61/06