| 摘要 |
PURPOSE:To obtain the titled material having a good developing activity, and to obtain a picture image having a high contrasty and less tendency for generating a fog and to improve a storage stability by incorporating a polymer having a specific monomer unit as a constituting component as a base precursor. CONSTITUTION:The prescribed polymer contains a monomer unit shown by formula I as the constituting component. In formula I, R1 is a hydrogen atom or 1-6C substd. or unsubst. alkyl group, L is 1-20C divalent binding radical, M is a cation, (x) has the same number of charges to that of a cation M, alkyl group comprises more preferably a methyl group. The divalent binding radical preferably contains p-phenylene, or m-phenylene groups, the cation comprises preferably a sodium, a potassium, a cesium, and a barium ions, a quaternary ammonium ion having <=8 total carbon numbers or a protonized base having >=7 pKa. The polybasic precursor preferably comprises polycarboxylic acid salt capable of decarboxylation at a temp. of 80-200 deg.C, preferably 100-200 deg.C.
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