| 摘要 |
PURPOSE:To enhance the heat resistance and solvent resistance of a pen point made of a fiber by using a specific polymer and an acrylic resin fiber having the specified degree of elongation at high temp. CONSTITUTION:A polymer consists of a polymer unit (1) of acrylonitrile and a polymer unit (2) of 2-acrylamide-2-methyl-propanesulfonic acid or a salt thereof. The ratio of the polymer unit (1) and the polymer unit (2) is set so that the polymer unit (2) occupies 0.4-1.5mol.% on the basis of the sum total of both polymer units. Further, the degree of polymerization of the polymer is within the range of 600-1500. Further, a slight amount of other polymer unit (3) may be contained and, as the polymer unit (3), a unit represented by formula I can be designated. The degree of elongation of both acrylic fibers to be used at 260 deg.C is 10% or less, pref., 6% or less. |
