US 11,679,578 B2
Nanofiber sheet, method for using same, and method for producing same
Suguru Ikeyama, Haga-gun (JP); Hideo Kobayashi, Moka (JP); Takehiko Tojo, Utsunomiya (JP); Koji Saito, Utsunomiya (JP); Yuting Yang, Utsunomiya (JP); Shunetsu Yonaiyama, Utsunomiya (JP); and Ikuo Fukuda, Chikusei (JP)
Assigned to Kao Corporation, Tokyo (JP)
Appl. No. 17/296,881
Filed by Kao Corporation, Tokyo (JP)
PCT Filed Nov. 25, 2019, PCT No. PCT/JP2019/046040
§ 371(c)(1), (2) Date May 25, 2021,
PCT Pub. No. WO2020/111014, PCT Pub. Date Jun. 4, 2020.
Claims priority of application No. JP2018-220763 (JP), filed on Nov. 26, 2018; application No. JP2018-220764 (JP), filed on Nov. 26, 2018; application No. JP2019-192102 (JP), filed on Oct. 21, 2019; and application No. JP2019-192103 (JP), filed on Oct. 21, 2019.
Prior Publication US 2022/0024172 A1, Jan. 27, 2022
Int. Cl. B32B 3/26 (2006.01); B32B 5/02 (2006.01); D01D 5/04 (2006.01); D04H 1/4374 (2012.01); D04H 1/728 (2012.01)
CPC B32B 3/263 (2013.01) [B32B 5/02 (2013.01); D01D 5/04 (2013.01); D04H 1/4374 (2013.01); D04H 1/728 (2013.01); B32B 2262/02 (2013.01); B32B 2307/732 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A nanofiber sheet comprising:
a substrate layer; and
a nanofiber layer located on one surface side of the substrate layer and containing nanofibers of a polymer compound, wherein:
a peripheral edge of the nanofiber layer has a thickness of from 0.1 to 10 μm;
the nanofiber layer includes at least 3 mm of a gradation region having a thickness that gradually increases inward from the peripheral edge;
the nanofiber layer is located adjacent to the substrate layer; and
the substrate layer has, on a surface facing the nanofiber laver, a plurality of depressions or projections each having a width greater than a fiber diameter of the nanofiber.