公开(公告)号：US20180264392A1

公开(公告)日：2018-09-20

申请号：US15764444

申请日：2016-09-30

Applicant: NITTO DENKO CORPORATION

Inventor： Takashi NIKI ,  Masaaki MORI ,  Shiho WADA ,  Atsushi DAIMON

IPC: B01D46/54 ,  B01D46/52 ,  B01D63/14 ,  B01D71/36 ,  B01D39/16 ,  B01D46/00

Abstract: An air filter medium includes a first porous PTFE membrane and a second porous PTFE membrane. An average fiber diameter of fibers included in the first porous PTFE membrane is 0.24 to 0.45 μm, an average fiber diameter of fibers included in the second porous PTFE membrane is 0.04 to 0.23 μm, the air filter medium has a first main surface and a second main surface, and the first porous PTFE membrane and the second porous PTFE membrane are arranged so that an air flow moving from the first main surface to the second main surface passes through the first porous PTFE membrane and subsequently through the second porous PTFE membrane.

公开(公告)号：US20190224609A1

公开(公告)日：2019-07-25

申请号：US16337806

申请日：2017-09-25

Applicant: NITTO DENKO CORPORATION

Inventor： Takashi NIKI ,  Masaaki MORI ,  Shiho WADA ,  Atsushi DAIMON ,  Toshiki YANAGI

IPC: B01D46/54 ,  B01D71/36 ,  B01D46/52 ,  B01D46/00 ,  B01D39/16 ,  C08J9/24 ,  B29D99/00

Abstract: An air filter medium includes a first porous PTFE membrane and a second porous PTFE membrane. The air filter medium (10) has a first main surface and a second main surface, and the first porous PTFE membrane and the second porous PTFE membrane are arranged so that an air flow moving from the first main surface to the second main surface passes through the first porous PTFE membrane and subsequently through the second porous PTFE membrane. A thickness of the first porous PTFE membrane is in the range of 4 to 40 μm and a specific surface area of the first porous PTFE membrane is 0.5 m2/g or less.

公开(公告)号：US20200002495A1

公开(公告)日：2020-01-02

申请号：US16337795

申请日：2017-09-25

Applicant: NITTO DENKO CORPORATION

Inventor： Takashi NIKI ,  Masaaki MORI ,  Shiho WADA ,  Atsushi DAIMON ,  Toshiki YANAGI

IPC: C08J9/00 ,  B01D39/16 ,  B01D46/52 ,  B01D63/14 ,  B01D69/02 ,  B01D71/36

Abstract: An air filter medium includes a first porous PTFE membrane and a second porous PTFE membrane. The air filter medium has a first main surface and a second main surface, and the first porous PTFE membrane and the second porous PTFE membrane are arranged so that an air flow moving from the first main surface to the second main surface passes through the first porous PTFE membrane and subsequently through the second porous PTFE membrane. A proportion of areas occupied by the plurality of nodes on a surface of the first porous PTFE membrane is in the range of 1.5 to 3.0% and an average of the areas of the plurality of nodes is 200 μm2 or more.

公开(公告)号：US20190232211A1

公开(公告)日：2019-08-01

申请号：US16338252

申请日：2017-09-25

Applicant: NITTO DENKO CORPORATION

Inventor： Takashi NIKI ,  Masaaki MORI ,  Shiho WADA ,  Atsushi DAIMON ,  Toshiki YANAGI

IPC: B01D46/54 ,  B01D46/52 ,  B01D39/16 ,  B32B3/28 ,  B32B5/02 ,  B32B27/32 ,  B32B27/12 ,  B32B27/08

CPC classification number: B01D46/543 ,  B01D39/16 ,  B01D39/1692 ,  B01D46/52 ,  B01D46/521 ,  B01D63/14 ,  B01D71/36 ,  B01D2239/0618 ,  B01D2239/065 ,  B01D2275/10 ,  B32B3/28 ,  B32B5/022 ,  B32B5/28 ,  B32B27/08 ,  B32B27/12 ,  B32B27/30 ,  B32B27/322 ,  B32B2307/724

Abstract: An air filter medium includes a first porous PTFE membrane and a second porous PTFE membrane. The air filter medium has a first main surface and a second main surface, and the first porous PTFE membrane and the second porous PTFE membrane are arranged so that an air flow moving from the first main surface to the second main surface passes through the first porous PTFE membrane and subsequently through the second porous PTFE membrane. A contact angle of the first porous PTFE membrane with water is in the range of 154° to 165°.