EP 3808880 A1 20210421 - CARBON FIBER AND METHOD FOR PRODUCING SAME
Title (en)
CARBON FIBER AND METHOD FOR PRODUCING SAME
Title (de)
KOHLEFASER UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
FIBRE DE CARBONE ET SON PROCÉDÉ DE PRODUCTION
Publication
Application
Priority
- JP 2018115112 A 20180618
- JP 2018115113 A 20180618
- JP 2018161056 A 20180830
- JP 2019023851 W 20190617
Abstract (en)
The invention aims to provide a carbon fiber that hardly suffers fractures during molding for producing a carbon fiber reinforced composite and serves to provide a carbon fiber reinforced composite having a high elastic modulus. The carbon fiber has a strand elastic modulus of 360 GPa or more, a strand strength of 3.5 GPa or more, and a single-fiber diameter of 6.0 µm or more, and further satisfying either or both of the requirements (a) and (b) specified below: (a) when one end is fixed end and the other end being free end which is capable of rotation about the axis of the fiber bundle, the residual twist count is 2 turns/m or more, and (b) the total fineness, which is the product of the single fiber fineness (g/km) and the filament number (number) of the carbon fiber, is 740 g/km or more. Furthermore, the carbon fiber meets the relationship represented by formula (1) wherein Es (GPa) is the single-fiber elastic modulus and A (N) is the loop fracture load: A≥ -0.0017 × Es + 1.02 ... formula (1). Or the carbon fiber has a single-fiber diameter of 6.0 µm or more, satisfies the relationship represented by formula (2) wherein E (GPa) is the strand elastic modulus and B (MPa) is the knot strength determined under conditions where the heat loss rate is 0.15% or less at 450°C, and has a twist count of 20 to 80 turns/m: B≥6.7×109×E−2.85
IPC 8 full level
CPC (source: EP KR US)
D01F 6/18 (2013.01 - EP KR US); D01F 6/38 (2013.01 - EP); D01F 9/22 (2013.01 - US); D01F 9/225 (2013.01 - EP KR)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 3808880 A1 20210421; EP 3808880 A4 20221102; CN 112368432 A 20210212; CN 112368432 B 20230728; JP 6702511 B1 20200603; JP WO2019244830 A1 20200625; KR 20210019029 A 20210219; MX 2020013140 A 20210129; TW 202006201 A 20200201; US 2021115597 A1 20210422; WO 2019244830 A1 20191226
DOCDB simple family (application)
EP 19822232 A 20190617; CN 201980039521 A 20190617; JP 2019023851 W 20190617; JP 2019538462 A 20190617; KR 20207037337 A 20190617; MX 2020013140 A 20190617; TW 108120916 A 20190617; US 201916972068 A 20190617