| 摘要 |
PROBLEM TO BE SOLVED: To prevent the alteration of a sheet due to the deletion of its content with a rubber eraser or the like from occurring by a method wherein microcapsules containing a core substance made of a self-adhesive component is included in a releasable developer layer for indelibility. SOLUTION: When an entry is made with a writing utensil 8 into the surface of an paper 1, the microcapsules in the colorant layer 4 of the upper paper 1 destructed by means of the writing pressure of the writing utensil, resulting in transferring the colorant in the microcapsule in the releasable developer layer 7 of a lower paper 2 so as to obtain a duplicate on the developer layer 6 of the lower paper 2 and, at the same time a coloring image 9 as the indelible record on the rear surface of the upper paper 2 through the separation separation of some part of the releasable developer layer 7 and its transferring to the upper paper 1 side. In this case, microcapsules containing a core substance made of a self-adhesive component is included in the releasable developer layer 7. As a result, the adhesion on of the developer in the releasable developer layer 7 to the colorant layer 4 face is strongly executed, resulting in making the deletion of the coloring image 9 with a rubber eraser difficult. Thus, the alteration due to the deletion can be discriminated and prevented form occurring. |
