Carbon fiber bundle, manufacturing method therefor, prepreg, and carbon fiber-reinforced composite material
US11760861B2 · kind B2 · utility
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Key dates
| Filing date | Apr 10, 2019 |
| Grant date | Sep 19, 2023 |
| Priority date | — |
| Expiry date | Oct 15, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2363/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A carbon fiber bundle has a relationship among a crystallite size Lc (nm), a single-fiber compressive strength Fc (GPa) measured by a compressive fragmentation method of single-fiber composites, and an initial modulus E0 (GPa) in a resin-impregnated strand tensile test simultaneously satisfies formulas (1) to (3), and Lc is 4.00 nm or less: Fc≥1.3×10/Lc−0.3 (1)E0≤80×Lc+155 (2)E0≥330 (3).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.