公开(公告)号：US11305997B2

公开(公告)日：2022-04-19

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.