| 摘要 |
PURPOSE:To ensure that coloring and storage properties are satisfactory and other installation requirements are met by adding a fluorene derivative having an amino group substituted by an alkyl group with an amino residual group or an amido residual group in the 6th position as an electron-donative colorless dry. CONSTITUTION:A fluorene derivative having an amino group substituted by an alkyl group containing an amine or amido residual group in the 6th position, for example, diisopropylnaphthalene in which a compound is dissolved, as an electron-donative colorless dye, is emulsified and dispersed in an aqueous solution of sodium salt, part of polyvinylbenzenesulfonic acid, to obtain an emulsion. Separately aqueous melamine and formaldehyde solutions are thermally stirred to obtain an aqueous transparent initial polymer solution of melamine and formaldehyde. This aqueous solution is mixed with the mentioned emulsion, and an aqueous solution of polyvinylalcohol and starch powder are added to this dispersion liquid. In addition, water is added to this adduct to condition a microcapsule-dispersed, liquid, and then it is applied to a sheet and dried to obtain a capsule sheet containing an electron-donative colorless dye. Next, this sheet is placed over an electron-receptive compound sheet and these sheets are given a load to allow color development. |
