Title:
CAVITY-CONTAINING POLYESTER FILM AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO2017010306
Kind Code:
A1
Abstract:
The present invention relates to a cavity-containing polyester film which has sufficient cavities and excellent degree of whiteness without deteriorating the film characteristics even in cases where a recovered starting material that enables reduction of the production cost is used therefor. A cavity-containing polyester film which is obtained by laminating a layer (layer B) composed of a polyester resin containing inorganic particles on both surfaces of a layer (layer A) internally containing cavities, and wherein: the layer A is formed of a composition containing a polyester resin and a polypropylene resin; the polypropylene resin satisfies all of the conditions (1)-(3) described below; and the apparent density of the film is within the range of 0.8-1.2 g/cm3. (1) The melt flow rate (MFR) (at a temperature of 230°C under a load of 2.16 kg) is 1.0-10 g/10 minutes. (2) The deflection temperature under load (at a bending stress of 0.45 MPa) is 85°C or more. (3) The weight average molecular weight Mw as determined by gel permeation chromatography (GPC) is within the range of 200,000-450,000, and the molecular weight distribution expressed by the ratio of the weight average molecular weight Mw to the number average molecular weight Mn, namely Mw/Mn is within the range of 2-6.
Inventors:
DEGUCHI SHOJI (JP)
BABA SHUNICHIRO (JP)
BABA SHUNICHIRO (JP)
Application Number:
PCT/JP2016/069492
Publication Date:
January 19, 2017
Filing Date:
June 30, 2016
Export Citation:
Assignee:
TOYO BOSEKI (JP)
International Classes:
B32B27/36; B29C48/18; B29C67/20; B32B5/18; B32B27/32; C08J9/00; B29C48/08; B29C48/21; B29K23/00; B29K67/00; B29L9/00
Domestic Patent References:
| WO2012008488A1 | 2012-01-19 | |||
| WO1995031490A1 | 1995-11-23 |
Foreign References:
| JPH1112377A | 1999-01-19 | |||
| JPH10128933A | 1998-05-19 | |||
| JP2001334623A | 2001-12-04 | |||
| JPH08325400A | 1996-12-10 |
Other References:
TOSHITAKA KANAI ET AL.: "Tei Rittai Kisokusei Polypropylene no Sen'i . Film Bun'ya eno Shin Tenkai", POLYMER MATERIAL FORUM KOEN YOKOSHU, vol. 18, 11 November 2009 (2009-11-11), pages 29 - 30, XP009508387
ASAHI KASEI AMIDAS CORP. ET AL.: "Plastic' Henshubu", PLASTIC DATA BOOK, 1 December 1999 (1999-12-01), pages 364 - 367, XP009508388
See also references of EP 3321085A4
ASAHI KASEI AMIDAS CORP. ET AL.: "Plastic' Henshubu", PLASTIC DATA BOOK, 1 December 1999 (1999-12-01), pages 364 - 367, XP009508388
See also references of EP 3321085A4
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