| 摘要 |
PURPOSE:To provide a ballpoint pen ink, characterized in that handwriting by said ink written on a paper surface can be easily erased by an erasing material such as an eraser, comprising by incorporating a pigment, a self-coagulable solid polymer, aself-coagulable liquid polymer and a solvent. CONSTITUTION:An ink contains a pigment, a self-coagulable solid polymer, a self- coagulable liquid polymer and s solvent. As a self-coagulable solid polymer to be used, there are a polyisoprene, a styrene-butadiene copolymer, a polychloroprene or a chlorinated polyethylene, As a self-coagulable liquid polymer to be used, a liquid polybutadien (MW 500-8,000), a liquid butadiene-acrylonitrile copolymer (MW 1,000-8,000) or a polystyrene (MW 200-1,500) are designated. As a solvent, if the storage stability of an ink is considered, a solvent having a b.p. of 100 deg.C or more is preferred and, moreover, one not corroding a metal constituting a tip of a ballpoint pen is pref. |
