| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a thermally color changing writing material which can form a script of an arbitrary writing line width changing according to writing pressure in a low writing pressure region and can form conveniently various thermally color changing images of characters, line drawings, patterns and others, and a writing material set the same. <P>SOLUTION: In the thermally color changing writing material and the writing material set using the same, a writing tip member is provided with a tapering contracted diameter part which can enlarge the writing line width by bending the writing tip in adaptation to an increase of the writing pressure in the limits of the writing pressure of 1-60 g and reduces the writing line width by recovery from bending due to lessening of the writing pressure. Through the intermediary of this writing tip member, an arbitrary image is formed by a thermally color changing coloring material which is prepared by dispersing in a water-based medium a reversible thermal-color changing microcapsule pigment which has transitory color changing temperature regions on the low and high temperature sides and presents a transitory color in a process to a complete color change. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
