PURPOSE: To obtain a heat developable photosensitive material having an excellent green shelf life by incorporating a heat solvent having the m.p. of a specific value or above in the form of solid particles into the heat developable photosensitive material.
CONSTITUTION: The heat solvent is a compd. having ≥130°C, more preferably 130W200°C m.p. and is solid at an ordinary temp. A compd. which exhibits the characteristic of the ratio between the inorg. and org. characteristics ranging 0.5W3.0, more preferably 0.7W2.5, further preferably 1.0W2.0 is useful. The more particularly preferable heat solvent is the compd. expressed by the formula. This developable photosensitive material is color-developed simply by heating the same for 1W180sec, more preferably 1.5W120sec usually in a 80W200°C, more preferably 120W170°C temp. range after imagewise exposing as it is. The heat developable photosensitive material having the excellent green shelf life is thus obtd.
OKAUCHI KEN
KOMAMURA TAWARA
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