| 摘要 |
PROBLEM TO BE SOLVED: To provide a new image recording medium used for the image recording in compliance with the condition of 360-420 nm essential as a process film and provided with good storage stability. SOLUTION: An image recording medium contains a leuco coloring matter substituted with a substituent P for removing hydrogen atoms moved by isomerizing a coloring matter represented by a formula I and its tautomer by the action of a base or a nucleophilic agent In the formula, A represents an atom group required for forming hydrogen containing heterocycles, B represents an atom group required for forming 6-member heterocyles and X represents oxygen atoms, sulfur atoms or nitrogen atoms (having hydrogen atoms or an available substituent.). |
