원래 이름 기록: KANEKA CORPORATION

A polyimide precursor composition contains a polyimide precursor and an organic solvent. The polyimide precursor has a structural unit into which a specific xanthene structure has been introduced. The imidization ratio of the polyimide precursor is 10 mol % or more and 100 mol % or less. The organic solvent may be one or more solvents selected from N-methyl-2-pyrrolidone, 1-butyl-2-pyrrolidone, 3-methoxy-N,N-dimethylpropanamide, 3-butoxy-N,N-dimethylpropanamide, N,N-dimethylpropionamide, N,N-diethylformamide and 1,3-dimethyl-2-imidazolidinone.

A polyacrylonitrile-based fiber bundle for artificial hair includes polyacrylonitrile-based synthetic fibers A and polyacrylonitrile-based synthetic fibers B. The polyacrylonitrile-based synthetic fibers A have fiber cross-sections with one or more shapes of a C-shape, a figure-6-shape, and a hollow broad bean-shape. The polyacrylonitrile-based synthetic fibers B have fiber cross-sections with one or more shapes of a hollow drop-shape and a drop-shape. The polyacrylonitrile-based synthetic fibers A have a flatness ratio of less than 1.5. The polyacrylonitrile-based synthetic fibers B have a flatness ratio of 1.5 or more. The C-shape, the figure-6-shape, or the hollow bean-shape of the fiber cross-sections has an inscribed circle with a diameter of 15 to 50 μm. The hollow drop-shape of the fiber cross-sections has an inscribed circle with a diameter of more than 0 μm and less than 15 μm. The fiber cross-sections have a thickness of 13 to 40 μm.