| abstract |
(57) Abstract: A highly reliable heat developable diazo copy material having heat developability suitable for high-speed copying and long-term storage is obtained. SOLUTION: In a heat-developable diazo copying material having a photosensitive thermosensitive layer containing at least a diazo compound and a coupler on a support, or a photosensitive layer containing a diazo compound and a thermosensitive layer containing a coupler, as the coupler, After hydrophobizing the surface of coupler particles that are hardly soluble in water, Used in microcapsules. |