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公开(公告)号：US20230019449A1
公开(公告)日：2023-01-19
申请号：US17781913
申请日：2020-12-03
Applicant: NITTO DENKO CORPORATION
Inventor： Hiroki KIGAMI , Yuichi TAKAMURA , Eisuke KUROGI , Kodai UEDA
Abstract: A provided stretched porous polytetrafluoroethylene membrane has a node-fibril structure including a plurality of nodes and a fibril connecting the plurality of nodes. A ratio of an average length of the plurality of nodes in a thickness direction of the stretched porous polytetrafluoroethylene membrane to a thickness of the stretched porous polytetrafluoroethylene membrane is 10% or more. The above stretched porous polytetrafluoroethylene membrane is less likely to suffer breakage. In the above stretched porous polytetrafluoroethylene membrane, assuming that there is a cuboid region having an upper surface and a lower surface respectively positioned at one membrane surface and the other membrane surface of the stretched porous polytetrafluoroethylene membrane, the number of the nodes included in the region may be 4 or less per micrometer thickness, the upper surface and the lower surface each having dimensions of 280 μm×280 μm.
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公开(公告)号：US20250018350A1
公开(公告)日：2025-01-16
申请号：US18709940
申请日：2022-11-08
Applicant: NITTO DENKO CORPORATION
Inventor： Kodai UEDA , Yu KAMAMOTO , Yuichi TAKAMURA , Satoru FURUYAMA
Abstract: An air-permeable filter includes a porous fluorine resin membrane having one principal surface and the other principal surface, and treated with an oil-repellent agent for oil-repellency. In a measurement of its absorption spectrum by Fourier-transform infrared spectroscopy, an absorbance ratio Rf of the one principal surface and an absorbance ratio Rb of the other principal surface calculated by Aa/Am are not substantially the same. The Aa indicates an absorbance at a peak derived from the oil-repellent agent in the absorption spectrum, and the Am indicates an absorbance at a peak derived from a C—F bond in the absorption spectrum.
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公开(公告)号：US20230025947A1
公开(公告)日：2023-01-26
申请号：US17781905
申请日：2020-12-03
Applicant: NITTO DENKO CORPORATION
Inventor： Yuichi TAKAMURA , Hiroki KIGAMI , Eisuke KUROGI , Kodai UEDA
Abstract: A provided stretched porous polytetrafluoroethylene membrane has an air permeability of 4 cm3/(sec·cm2) or more, as expressed in terms of Frazier air permeability, in a thickness direction, and has a total cohesion of 1.9 (N/20 mm)2 or more, the total cohesion being expressed by a product of a peel cohesion in a first in-plane direction and a peel cohesion in a second in-plane direction perpendicular to the first direction. The above stretched porous membrane is highly air-permeable and, for example, when included in a filter member, being less likely to suffer breakage at the time of handling the member or placing the member on a housing or the like.
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