公开(公告)号：US20250113476A1

公开(公告)日：2025-04-03

申请号：US18857919

申请日：2022-05-23

Applicant: TPR CO., LTD.

Inventor： Katsuhito SUZUKI ,  Toshiaki SHIMIZU

IPC: H05K9/00

Abstract: Provided are: an electromagnetic wave absorber including fibrous carbon; and an electromagnetic wave shielding composite including: the electromagnetic wave absorber; and an electromagnetic wave reflection layer formed on one surface side of the electromagnetic wave absorber. The electromagnetic wave absorber has a complex permittivity with a real part of from 6 to 30 and an imaginary part of from 1 to 25 at a frequency of 24 GHz. When the electromagnetic wave absorber is cut, the number of fiber bundles of the fibrous carbon observed on a cut surface of the electromagnetic wave absorber, the fiber bundles each having a maximum diameter of 100 nm or more, is 10 or less per 10 μm×10 μm.

公开(公告)号：US20200339421A1

公开(公告)日：2020-10-29

申请号：US16850737

申请日：2020-04-16

Applicant: TPR CO., LTD.

Inventor： Toshiaki SHIMIZU ,  Shinpei TESHIMA ,  Yasuhiko OKAMURA ,  Yusuke KAWAGUCHI ,  Kazuki OTOMO ,  Yuta KOGUCHI ,  Katsuhito SUZUKI ,  Yoshio BANDO

IPC: C01B32/162

Abstract: Applicability to a composite material with high purity and high strength, and a material requiring high conductivity or high thermal conductivity is enhanced. The present invention relates to a multi-walled carbon nanotube having two or more tubes of a graphene sheet where carbon atoms are arranged in a hexagonal honeycomb form, coaxially, wherein a diameter of an outermost wall based on observation of an image by a transmission electron microscope is 3 nm or more and 15 nm or less, and a length based on observation of an image of a scanning electron microscope is 1.0 mm or more, an aggregate of multi-walled carbon nanotubes and a method for preparing the multi-walled carbon nanotube.