FILTER MATERIAL FOR AIR FILTERS, AND METHOD FOR MANUFACTURING SAME

WIPO Patent Application WO/2023/195317

A1

The present disclosure addresses the problem of providing a filter material that is for air filters and that does not contain PFAS or siloxane compounds and has an excellent physical property balance of PF value, water repellency, and strength. A filter material for air filters according to the present disclosure is formed of a wet nonwoven fabric, and is characterized by containing a binder resin and a water-repellent agent and is characterized in that the water-repellent agent contains, as a main component, an acrylic polymer not including fluorine or silicon in the molecule. A method for manufacturing a filtering material for air filters according to the present disclosure is characterized by comprising: a step for forming a moist sheet by shaping a slurry of fibers into a sheet by a wet papermaking method; a step for impregnating the moist sheet with an aqueous dispersion liquid that contains a binder resin and a water-repellent agent containing, as a main component, an acrylic polymer that does not include fluorine or silicon in the molecule; and a step for obtaining a dry sheet by heating the moist sheet impregnated with the aqueous dispersion liquid to dry the same.

TASHIRO NOZOMI (JP)
SATO MASASHI (JP)

PCT/JP2023/010249

October 12, 2023

March 16, 2023

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HOKUETSU CORP (JP)

B01D39/20; D21H27/08

JPH09225226A	1997-09-02
JP2019026747A	2019-02-21
JP2015120895A	2015-07-02
JP2015172198A	2015-10-01
JP7055261B1	2022-04-15
JP2011062643A	2011-03-31
JP2017060932A	2017-03-30

IMASHITA, Katsuhiro et al. (JP)

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