Carbon fiber bundle and method for producing carbon fiber bundle

A carbon fiber bundle with controlled diameter and production methods achieves high strand strength and elastic modulus, addressing impregnation and compressive strength issues, enhancing composite material performance.

EP4711509A1Pending Publication Date: 2026-03-18MITSUBISHI CHEM CORP
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-05-10
Publication Date
2026-03-18

AI Technical Summary

Technical Problem

Existing carbon fiber bundles face challenges in achieving high strand strength and strand elastic modulus while maintaining a large single fiber diameter, leading to insufficient resin impregnation and reduced compressive strength in the fiber axial direction.

Method used

A carbon fiber bundle with an average diameter of 6.5 µm to 8.5 µm, high strand strength of 4.5 GPa or more, and strand elastic modulus of 320 GPa or more, produced through a method involving controlled heating and stretching steps to minimize twist and entanglement, ensuring excellent resin impregnation and compressive strength.

Benefits of technology

The solution provides a carbon fiber bundle with enhanced mechanical properties, including improved compressive strength and resin impregnation, without compromising strand strength and elastic modulus, suitable for high-performance composite materials.

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Abstract

Provided a carbon fiber bundle in which the average diameter of carbon fiber single-fibers is increased without reducing the strand strength and strand elastic modulus of the carbon fibers, and a method for producing the same. Also provided is a carbon fiber suitable for a carbon fiber composite material having excellent compressive strength in the fiber axial direction. The carbon fiber bundle of the present invention has a strand strength of 4.5 GPa or more, a strand elastic modulus of 320 GPa or more, substantially no twist, and an average diameter of carbon fiber single-fibers of 6.5 µm or more and 8.5 µm or less.
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Citation Information

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