PURPOSE: To prevent the generation of contamination on a formed image by incorporating a polymer contg. ≤20% component having ≤2,000mol.wt. and having at least a group which forms a Schiff base at the time of heat development into a titled material.

CONSTITUTION: The polymer contg. ≤20% component having ≤2,000mol.wt. and having at least the group which forms the Schiff base at the time of heat development is incorporated into the titled material. The effect of decreasing the contamination is obtd. if the content of the component having ≤2,000mol.wt. is preferably ≤10%, more preferably ≤5%. The weight average mol.wt. of the polymer is preferably 3,000W500,000. The group which forms the Schiff base at the time of heat development is preferably a group which forms the Schiff base by reacting quickly with the compd. having an amino group at 80W200°C, and is more particularly preferably an aldehyde group. The sharp transferred image which does not generate the image contamination is thus obtd.