公开(公告)号：US20240140801A1

公开(公告)日：2024-05-02

申请号：US18547926

申请日：2022-03-14

Applicant: ZEON CORPORATION

Inventor： Tomoko YAMAGISHI ,  Yoshihisa TAKEYAMA

IPC: C01B32/158

CPC classification number: C01B32/158 ,  C01B2202/08 ,  C01P2002/70 ,  C01P2004/03 ,  C01P2004/20 ,  C01P2004/61 ,  C01P2006/90

Abstract: A carbon film excellent in electromagnetic shielding performance is provided. The carbon film is made of a carbon nanotube assembly and has a fractal dimension of 2.6 or more and 4 or less in a wavenumber range of 0.0001 (1/Å) or more and 0.001 (1/Å) or less when a scattering profile obtained by performing ultra-small-angle X-ray scattering on at least one surface of the carbon film is fitted to the Beaucage equation, while having a porosity of 80% or more and 95% or less.

公开(公告)号：US20220071068A1

公开(公告)日：2022-03-03

申请号：US17420719

申请日：2020-01-28

Applicant: ZEON CORPORATION

Inventor： Arinobu KATADA ,  Tomoko YAMAGISHI ,  Mitsugu UEJIMA

IPC: H05K9/00 ,  C01B32/159

Abstract: An electromagnetic wave absorbing sheet includes a sheet-shaped fibrous substrate and a plurality of carbon nanotubes attached to the sheet-shaped fibrous substrate. The attached amount of the carbon nanotubes in the electromagnetic wave absorbing sheet is 5 mass % or more. The electromagnetic wave absorbing sheet has a surface resistance of 20 Ω/sq. or more.

公开(公告)号：US20250128949A1

公开(公告)日：2025-04-24

申请号：US18835735

申请日：2023-02-20

Applicant: ZEON CORPORATION

Inventor： Tomoko YAMAGISHI

IPC: C01B32/174 ,  C01B32/159

Abstract: Provided is a carbon nanotube dispersion liquid that can cause an electrode for a secondary battery to display strong peel strength between an electrode mixed material layer and a current collector formed of a metal or the like, that can cause a releasable substrate-attached electrode mixed material layer to display weak peel strength between an electrode mixed material layer and a releasable substrate formed of a resin or the like, and that can cause a secondary battery to display excellent rate characteristics, or that enables the achievement of good film formation properties during carbon film formation. The carbon nanotube dispersion liquid contains carbon nanotubes and a solvent and has a fractal dimension 3 to 4 in a wavenumber range of 0.001 (1/angstrom) to 0.3 (1/angstrom) when a scattering curve obtained through measurement by ultra-small-angle X-ray scattering is analyzed by the Beaucage model.

公开(公告)号：US20230271835A1

公开(公告)日：2023-08-31

申请号：US18303567

申请日：2023-04-20

Applicant: ZEON CORPORATION

Inventor： Tomoko YAMAGISHI ,  Mitsugu UEJIMA

IPC: C01B32/159

CPC classification number: C01B32/159 ,  C01P2006/12

Abstract: Provided is a production method of a carbon sheet having a structure intertwining only carbon nanotubes and having a porosity of 5% to 90%. The method comprises: removing a solvent from a dispersion liquid containing carbon nanotubes, spacer particles, and the solvent to obtain a primary sheet containing the carbon nanotubes and the spacer particles; and removing the spacer particles from the primary sheet. Alternatively, the method comprises: impregnating a porous substrate made from carbon with a dispersion liquid containing carbon nanotubes and a solvent, to obtain a dispersion liquid-impregnated porous substrate; and removing the solvent from the dispersion liquid-impregnated porous substrate. Alternatively, the method comprises: dispersing carbon nanotubes in a solvent to obtain a dispersion liquid, wherein an average bundle diameter of the carbon nanotubes in the dispersion liquid is 0.5 μm or more and 1,000 μm or less; and removing the solvent from the dispersion liquid.

公开(公告)号：US20220185669A1

公开(公告)日：2022-06-16

申请号：US17653674

申请日：2022-03-07

Applicant: ZEON CORPORATION

Inventor： Tomoko YAMAGISHI ,  Mitsugu UEJIMA

IPC: C01B32/159

Abstract: Provided is a material that has excellent handleability and processability, and that when used as a support for a different material, enables support of the different material up to an inner part thereof. A carbon sheet contains one or more carbon nanotubes and has a porosity of not less than 48% and not more than 90%. The carbon sheet preferably includes: a porous substrate made from carbon; and the carbon nanotubes, attached to the porous substrate. The carbon nanotubes contained in the carbon sheet are preferably single-walled carbon nanotubes. Moreover, the carbon nanotubes contained in the carbon sheet preferably have a nitrogen adsorption specific surface area of 600 m2/g or more.

公开(公告)号：US20230416094A1

公开(公告)日：2023-12-28

申请号：US18253390

申请日：2021-11-30

Applicant: ZEON CORPORATION

Inventor： Tomoko YAMAGISHI ,  Mitsugu UEJIMA

IPC: C01B32/16 ,  G01N15/08

CPC classification number: C01B32/16 ,  G01N15/0886 ,  C01P2006/17 ,  C01P2004/13 ,  C01P2002/82

Abstract: A carbon film is formed from carbon nanotube assemblies. In the carbon film, a pore distribution curve indicating the relationship between the pore size and the Log differential pore capacity obtained based on mercury intrusion porosimetry has at least one peak with a log differential pore capacity of 1.0 cm3/g or more within a pore size range of 10 nm or more and 100 μm or less.

公开(公告)号：US20180065854A1

公开(公告)日：2018-03-08

申请号：US15560260

申请日：2016-03-22

Applicant: ZEON CORPORATION

Inventor： Tomoko YAMAGISHI ,  Mitsugu UEJIMA

IPC: C01B32/166 ,  B82Y30/00 ,  B82Y40/00 ,  H01B1/04

CPC classification number: C01B32/166 ,  B82Y30/00 ,  B82Y40/00 ,  C01B32/05 ,  C01B2202/22 ,  C01B2202/32 ,  H01B1/04

Abstract: Provided is a carbon film including: a plurality of fibrous carbon nanostructures; and a conductive carbon, wherein the plurality of fibrous carbon nanostructures has a BET specific surface area of 500 m2/g or more. Also provided is a method of producing a carbon film, the method including mixing a conductive carbon into a fibrous carbon nanostructure dispersion liquid containing a plurality of fibrous carbon nanostructures having a BET specific surface area of 500 m2/g or more, a dispersant, and a solvent, and subsequently removing the solvent to form a carbon film.

公开(公告)号：US20170369319A1

公开(公告)日：2017-12-28

申请号：US15538372

申请日：2015-12-24

Applicant: ZEON CORPORATION

Inventor： Tomoko YAMAGISHI ,  Mitsugu UEJIMA

IPC: C01B32/166 ,  B82Y40/00 ,  H01B1/04

CPC classification number: C01B32/166 ,  B82Y40/00 ,  C01B32/05 ,  C01B2202/32 ,  H01B1/04 ,  H01B5/02 ,  H01B13/00

Abstract: A carbon nanotube film includes an assembly of a plurality of carbon nanotubes, wherein the plurality of carbon nanotubes includes one or more carbon nanotubes having at least partially collapsed structures. A method for producing a carbon nanotube film includes forming a carbon nanotube film by removing a solvent from a carbon nanotube dispersion liquid containing the solvent, a dispersant, and a plurality of carbon nanotubes including one or more carbon nanotubes having at least partially collapsed structures.

公开(公告)号：US20230080840A1

公开(公告)日：2023-03-16

申请号：US17904290

申请日：2021-02-17

Applicant: ZEON CORPORATION

Inventor： Tomoko YAMAGISHI ,  Mitsugu UEJIMA

IPC: C01B32/162 ,  H05K9/00

Abstract: The present disclosure is directed to providing a carbon film having an excellent shield performance against electromagnetic waves. The carbon film of the present disclosure is a carbon film made of a carbon nanotube assembly, wherein a pore distribution curve of the carbon film indicating the relationship between the pore size and the Log differential pore capacity obtained from an adsorption isotherm at 77 K of liquid nitrogen based on the Barrett-Joyner-Halenda method has a peak in which the Log differential pore capacity is maximized within a pore size range of 10 nm or more and 100 nm or less, and the value of the Log differential pore capacity at the peak is 1.2 cm3/g or more.

公开(公告)号：US20230073662A1

公开(公告)日：2023-03-09

申请号：US17904292

申请日：2021-02-15

Applicant: ZEON CORPORATION

Inventor： Akiyoshi SHIBUYA ,  Tomoko YAMAGISHI

IPC: C01B32/162

Abstract: A carbon nanotube assembly satisfies at least one of the following conditions (1) to (3): (1) an FT-IR spectrum of a CNT dispersion obtained by dispersing the CNT assembly has a peak based on plasmon resonance of the CNTs in a wave number range of greater than 300 cm−1 and 2000 cm−1 or less; (2) the highest peak in a differential pore capacity distribution of the CNT assembly is located within a pore size range of more than 100 nm and less than 400 nm; and (3) a two-dimensional spatial frequency spectrum of an electronic micrographic image of the CNT assembly has at least one peak within a range of 1 μm−1 or more and 100 μm−1 or less.