Patent ID: 8822029
Filing Date: 2014-09-02
Classification: C08F,D01F,Y10T

Abstract:
1. A method of producing a carbon fiber precursor fiber comprising subjecting a polyacrylonitrile-based polymer solution comprising a polyacrylonitrile-based polymer satisfying at least one of [a] to [d]: [a] a Z-average molecular weight (Mz) determined by gel-permeation chromatograph (GPC) of 800,000 to 6,000,000 and a degree of polydispersity (Mz/Mw) (Mw denotes weight average molecular weight) of 3.0 to 10.0; [b] a Z+1-average molecular weight (Mz+1) determined by GPC method of 3,000,000 to 10,000,000 and degree of polydispersity (Mz+1/Mw) of 6.0 to 25.0; [c] an Mzm determined by gel-permeation chromatograph multi-angle laserlight scattering photometry (GPC-MALLS) of 400,000 to 1,000,000 and a degree of polydispersity (Mzm/Mwm) of 3.0 to 10.0; and [d] a Z-average radius of gyration (Rz) determined by gel-permeation chromatograph-multi-angle laserlight scattering photometry (GPC-MALLS) of 25 to 45 nm and a ratio to weight average radius of gyration (Rz/Rw) of 1.3 to 2.5, to dry-wet spinning, wherein i) a degree of polydispersity (Mz/Mw) is 1.1 times or more of a molecular weight distribution (Mw/Mn) (Mn denotes number average molecular weight) in [a] and a degree of polydispersity (Mzm/Mwm) is 1.1 times or more of a molecular weight distribution (Mwm/Mnm) in [c], and ii) component A of the polyacrylonitrile-based polymer has a weight average molecular weight (Mw) of 1,000,000 to 15,000,000 as determined by a GPC method and a component B of the polyacrylonitrile-based polymer has a weight average molecular weight (Mw) of 150,000 to 1,000,000, wherein a weight average molecular weight ratio of the component A to the component B is 2 to 45, and a weight ratio of the component A to the component B is 0.001 to 0.3.