| 摘要 |
PURPOSE:To control sublimable transfer amount of dye and to facilitate gradation recording by altering energy to be applied to a heat sensitive head at the time of heat transfer by using specific anthraquinone cyan dye. CONSTITUTION:The quantity of sublimation starting heat has no correlation directly to molecular weight itself, but relates to mutual action among colorant molecules and to mutual action between dye molecules and ink binder resin. Even if the molecular weight of the dye is slightly increased, the dye having satisfactory solubility to ink solvent and lower melting point is desired, and the dye having mutual action to the binder resin for ink to be small in the degree not lose preservation stability after a ribbon is manufactured is most desirable. Dye represented by a formula (I) exceeds 400 of molecular weight, but obtains relatively desirable sublimating speed. In the formula, R1 is alkoxycarbonylalkyl group, alkylcarbonylalkyl group having normal chain or branch, R2 is hydrogen atom, lower alkyl group, alkoxy group, alkenyl group, trifluoromethyl group, having normal chain or branch, halogen atom. |
