| 摘要 |
PURPOSE:An acrylonitrile polymer which can show improved melt moldability without using water as a plasticizer and can be used in the production of fiber, mainly consisting of acrylonitrile units and having a specified reduced viscosity and a MW distribution. CONSTITUTION:A melt-moldable acrylonitrile polymer consisting of 80wt% or above acrylonitrile and having a reduced viscosity <=1.0 and a molecular weight distribution, MW/MN ratio, <=1.8. It is further necessary that the half-value width of 2theta is 17 deg. in an X-ray diffraction pattern, which is a parameter representing the crystallinity of a fiber obtained by melt molding. By adopting such a half-value width, a fiber which can be actually used can be obtained. A fiber obtained by melt-molding the above polymer having an acrylonitrile unit content <80wt% is poorly crystalline, nonoriented one and is not desirable because of its poor fiber properties.
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