Carbon fiber precursor fiber, fiber for carbon fiber precursor fiber, method of producing carbon fiber precursor fiber, method of producing stabilized fiber, and method of producing carbon fiber

Patent metadata

Field	Value
Publication number	US-12503795-B2
Application number	US-202217965946-A
Country	US
Kind code	B2
Filing date	Oct 14, 2022
Priority date	Oct 26, 2021
Publication date	Dec 23, 2025
Grant date	Dec 23, 2025

Abstract

The carbon fiber precursor fiber of the disclosure includes an acrylamide-based polymer fiber; and a self-crosslinked product of a self-crosslinking silicone oil on a surface of the acrylamide-based polymer fiber.

First claim

What is claimed is:

1 . A carbon fiber precursor fiber, comprising:
an acrylamide-based polymer fiber; and a self-crosslinked product of a self-crosslinking silicone oil on a surface of the acrylamide-based polymer fiber.

2 . The carbon fiber precursor fiber according to claim 1 , wherein a content of the self-crosslinked product is from 0.1 parts by mass to 20 parts by mass with respect to 100 parts by mass of the acrylamide-based polymer fiber.

3 . The carbon fiber precursor fiber according to claim 1 , wherein:
the acrylamide-based polymer fiber is formed of an acrylamide-based polymer, and the acrylamide-based polymer contains 30 mol % or more of an acrylamide-based monomer unit with respect to all monomer units configuring the acrylamide-based polymer.

4 . The carbon fiber precursor fiber according to claim 3 , wherein the acrylamide-based polymer contains from 40 mol % to 99.8 mol % of the acrylamide-based monomer unit, from 0.1 mol % to 50 mol % of a vinyl cyanide monomer unit, and from 0.1 mol % to 30 mol % of an unsaturated carboxylic acid-based monomer unit, with respect to all monomer units configuring the acrylamide-based polymer.

5 . The carbon fiber precursor fiber according to claim 1 , wherein the self-crosslinking silicone oil has an acrylic group or a methacrylic group.

6 . The carbon fiber precursor fiber according to claim 1 , wherein the self-crosslinking silicone oil has a viscosity of 9 mm 2 /s or more at 25° C.

7 . A fiber for carbon fiber precursor fiber, comprising:
an acrylamide-based polymer fiber; and an uncrosslinked product of a self-crosslinking silicone oil on a surface of the acrylamide-based polymer fiber.

8 . A method of producing a carbon fiber precursor fiber, the method comprising:
subjecting the fiber for the carbon fiber precursor fiber according to claim 7 to a crosslinking treatment.

9 . The method of producing a carbon fiber precursor fiber according to claim 8 , wherein the crosslinking treatment is an electron beam treatment.

10 . A method of producing a stabilized fiber, the method comprising:
subjecting the carbon fiber precursor fiber according to claim 1 to a stabilization treatment.

11 . A method of producing a carbon fiber, the method comprising:
obtaining a stabilized fiber by the method of producing a stabilized fiber according to claim 10 ; and subjecting the stabilized fiber to a carbonization treatment.

Assignees

• Toyota Chuo Kenkyusho Kk
• Toyota Motor Co Ltd

Inventors

• Narita Mamiko
• Matsushita Mitsumasa
• Morishita Takuya
• Sakakura Natsu
• Kunitomo Akira
• Shigemitsu Nozomu

Classifications

• D06M15/6433

  containing carboxylic groups · CPC title

• C01B32/05

  Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30 · CPC title

• D06M2101/26

  Polymers or copolymers of unsaturated carboxylic acids or derivatives thereof · CPC title

• D01F6/28 Primary

  from copolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• D06M10/10

  Macromolecular compounds · CPC title