Title:
BIAXIALLY STRETCHED POLYPROPYLENE FILM FOR CAPACITOR, METALLIZED FILM, AND FILM CAPACITOR
Document Type and Number:
WIPO Patent Application WO/2012/144015
Kind Code:
A1
Abstract:
Provided is a biaxially stretched polypropylene film for capacitors which has high withstand voltage characteristics when used as a dielectric for capacitors and which has highly suitable processability into elements.
The biaxially stretched polypropylene film for capacitors has projections on both surfaces and has a thickness (t1, µm) of 4-20 µm. When one of the surfaces is expressed by surface A and the other by surface B, all of the following relationships are satisfied.
800≤SRzB≤1,300 (nm)
0.1≤SRzA/SRzB≤0.8
PBmin≥100 (nm)
PBmax≤1,500 (nm)
0.4≤PB450-750/PB≤0.7
In the relationships,
SRzA is the 10-point average roughness of surface A (nm),
SRzB is the 10-point average roughness of surface B (nm),
PBmin is the minimum projection height of surface B (nm),
PBmax is the maximum projection height of surface B (nm),
PB450-750 is the total number of projections which are present on surface B and which each have a height of 450 nm or greater but less than 750 nm, per 0.1 mm2 (projections/0.1 mm2), and
PB is the total number of projections present on surface B per 0.1 mm2 (projections/0.1 mm2).
Inventors:
NAKATSUKA TAKANORI (JP)
MIZUSHIMA MASAMI (JP)
ASANO TETSUYA (JP)
MIZUSHIMA MASAMI (JP)
ASANO TETSUYA (JP)
Application Number:
PCT/JP2011/059592
Publication Date:
October 26, 2012
Filing Date:
April 19, 2011
Export Citation:
Assignee:
TORAY INDUSTRIES (JP)
NAKATSUKA TAKANORI (JP)
MIZUSHIMA MASAMI (JP)
ASANO TETSUYA (JP)
NAKATSUKA TAKANORI (JP)
MIZUSHIMA MASAMI (JP)
ASANO TETSUYA (JP)
International Classes:
H01G4/18; B29C55/12; B32B15/085; C08J5/18
Foreign References:
| JP2007290380A | 2007-11-08 | |||
| JP2006066615A | 2006-03-09 | |||
| JP2006269726A | 2006-10-05 | |||
| JP2000030973A | 2000-01-28 | |||
| JP2011122142A | 2011-06-23 | |||
| JP2011122143A | 2011-06-23 | |||
| JPS5163500A | 1976-06-01 | |||
| JP2001324607A | 2001-11-22 | |||
| JP2001129944A | 2001-05-15 | |||
| JP2001072778A | 2001-03-21 | |||
| JP3508515B2 | 2004-03-22 | |||
| JPS62121704A | 1987-06-03 | |||
| JP2869606B2 | 1999-03-10 |
Other References:
See also references of EP 2701165A4
M. FUJIYAMA, JOURNAL OF APPLIED POLYMER SCIENCE, vol. 36, 1988, pages 985 - 1948
"High Polymer Analysis Handbook", 1995, pages: 609 - 611
M. FUJIYAMA, JOURNAL OF APPLIED POLYMER SCIENCE, vol. 36, 1988, pages 985 - 1948
"High Polymer Analysis Handbook", 1995, pages: 609 - 611
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