Title:
VENTILATION FILTER AND VENTILATION MEMBER
Document Type and Number:
WIPO Patent Application WO/2023/090205
Kind Code:
A1
Abstract:
A ventilation filter has one main surface and another main surface, and includes a fluororesin porous membrane treated with an oil-repellent agent for oil repellency. When the absorption spectrum is measured through Fourier-transform infrared spectroscopy, the absorbance ratio Rf of the one main surface calculated by Aa/Am and the absorbance ratio Rb of the other main surface are not substantially the same. Aa indicates the absorbance at a peak derived from the oil repellent in the absorption spectrum, and Am indicates the absorbance at a peak derived from a C-F bond in the absorption spectrum.
Inventors:
UEDA KODAI (JP)
KAMAMOTO YU (JP)
TAKAMURA YUICHI (JP)
FURUYAMA SATORU (JP)
KAMAMOTO YU (JP)
TAKAMURA YUICHI (JP)
FURUYAMA SATORU (JP)
Application Number:
PCT/JP2022/041593
Publication Date:
May 25, 2023
Filing Date:
November 08, 2022
Export Citation:
Assignee:
NITTO DENKO CORP (JP)
International Classes:
B01D39/16; B01D69/10; B01D69/12; B01D71/32; B01D71/36; B01D71/52; C08J9/00
Domestic Patent References:
| WO2008128760A1 | 2008-10-30 | |||
| WO2017033806A1 | 2017-03-02 |
Foreign References:
| KR20210053696A | 2021-05-12 | |||
| JP2005253711A | 2005-09-22 | |||
| US20090191397A1 | 2009-07-30 | |||
| JP2013541608A | 2013-11-14 | |||
| JP2019123761A | 2019-07-25 |
Attorney, Agent or Firm:
KAMADA Koichi (JP)
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