公开(公告)号：EP2628827A4

公开(公告)日：2014-07-09

申请号：EP11832602

申请日：2011-10-13

申请人： MITSUBISHI RAYON CO

发明人： SHINMEN YUUSUKE ,  HIROTA NORIFUMI ,  NAKAJIMA ATSUSHI ,  AOYAMA NAOKI ,  MATSUYAMA NAOMASA ,  NII TAKESHI ,  KOGAME AKIYOSHI ,  FUJII YASUYUKI ,  IRIE YOSHIKO ,  MATSUDA HARUMI ,  KIRIYAMA TAKAYUKI ,  MIURA TEPPEI ,  TERANISHI TAKUYA ,  MORI SHOUHEI ,  KANEKO MANABU ,  NUMATA KIHARU ,  ICHINO MASAHIRO ,  TAKEDA SHIGEKAZU ,  KOBAYASHI TAKAYUKI ,  ITOU TOSHIYUKI ,  HATA MASAHIRO ,  NAKAO HIROYUKI ,  WATANABE KENICHI

IPC分类号： D01F6/18 ,  C08J5/04 ,  D01D5/253 ,  D01F9/22

CPC分类号： D01F9/12 ,  B29C70/44 ,  B32B37/14 ,  C08J5/042 ,  C08J5/24 ,  C08J2363/00 ,  D01D5/096 ,  D01D5/253 ,  D01F6/38 ,  D01F9/225 ,  F27D7/00 ,  Y10T428/26 ,  Y10T428/298 ,  Y10T442/3089

摘要： Provided are: a carbon fiber bundle which has a large value of single-fiber fineness and excellent productivity and which, despite this, contains few interlaced single fibers therein and has excellent spreadability; and precursor fibers which are suitable for use in producing the carbon fiber bundle. The precursor fibers are a carbon-fiber-precursor acrylic fiber bundle which comprises a polyacrylonitrile copolymer comprising 95-99 mol% acrylonitrile units and 1-5 mol% hydroxyalkyl (meth)acrylate units and which has a single-fiber fineness of 1.5-5.0 dtex. In the acrylic fiber bundle, the cross-section of each single fiber which is perpendicular to the fiber axis has a shape that has a roundness of 0.9 or less. The roundness is a value determined using equation (1) where S and L are the cross-sectional area and the circumferential length, respectively, of a single fiber which are obtained by examining, with an SEM, the cross-section of the single fiber which is perpendicular to the fiber axis and analyzing the obtained image. Roundness = 4pS/L 2 (1)