| 摘要 |
PURPOSE:To obtain the under coat layer of the sensitive material which is suitable for development processing and is capable of decoloring and has anti- halation function by incorporating a specified polymer, a specified dyestuff and a nonionic surfactant in the title material. CONSTITUTION:The polymer shown by formula I, at least one kind of the dyestuff shown by formula II and the nonionic surfactant are incorporated in the under coat layer. In formula I, A is an ethylenic unsatd. monomer unit, B is a monomer unit having at least two ethylenic unsatd. groups, R1 is hydrogen atom, etc., L is 1-12C a divalent group, R2-R4 are each alkyl group, etc., (x), (y) and (z) are each a mol. ratio of copolymerization, (x) is 0-90mol.%, (y) is 9.9-99.9mol.%, (z) is 0.1-50mol.%. In formula II, R1 is carboxylic acid group, etc., R2 is -CONR3R4, or -NR3COR4 group, L1-L3 are each methine group, (n) is 0, 1 or 2. Thus, the decoloring property of the sensitive material at the time of processing is improved.
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