HEAT DEVELOPABLE DIAZO COPYING MATERIAL

摘要

PROBLEM TO BE SOLVED: To obtain a heat developable diazo copying material excellent in color forming property and raw stock preservability and also having enhanced color forming property in high-speed development. SOLUTION: The heat developable diazo copying material has a photosensitive layer containing a diazo compound and a coupler layer containing a coupler on the substrate. The coupler layer further contains composite particles obtained by making a heat fusible material forming a eutectic mixture with the coupler and a copolymer using a monomer having a carboxyl group as a constituent component compatible with each other by heating and then dispersing those after cooling.