| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a simple-structured oily writing utensil, with which a favorable calligraphic specimen can be lastingly drawn on a non-permeable material such as glass or a plastic and further on a fibrous material due to the realization of the easy adjustment between the specific weight of an ink and that of an ink backflowing preventing body and of the prevention of the turning-around phenomenon between the ink and the ink backflowing preventing body. <P>SOLUTION: This oily writing utensil is formed by directly charging the oily ink in a barrel and the ink backflowing preventing body composition in the rear end part of the ink. The oily ink includes at least a colorant, an organic solvent with the steam pressure of 5.0-50 mm Hg (20°C) as a main solvent and a resin. The ink backflowing preventing body composition includes a nonvolatile liquid and/or a liquid difficult to volatile, a gelling agent and hollow particles having an average particle diameter of 0.1-10 μm. <P>COPYRIGHT: (C)2004,JPO |
