| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat developoable diazo copying material having developing property capable of coping with high speed copying, excellent in green preservability for a long term and having the excellent quality of an initial image and the reliability of an image. SOLUTION: Relating to the heat developable diazo copying material provided with a single layer of a photosensitive heat sensitive recording layer or a photosensitive heat sensitive recording layer composed of a photosensitive layer and a coupler layer on a supporting body, the photosensitive heat sensitive recording layer or the coupler layer contains a malonic ester derivative expressed by general formula (1). In the formula, R represents hydrogen, a lower alkyl group, a lower alkoxy group or a halogen atom. |
