| 摘要 |
of the disclosure: Disclosed is an alkali developable photosensitive resin composition useful for an offset printing plate, which has excellent developability and provides long life of a developer. The photosensitive resin composition comprising: (a) an alkali-soluble type binder resin, (b) a photosensitive substance, and (c) a dye; said binder resin (a) having an ampho-ionic group represented by the formula: ¢wherein R1 is H or a C1-10 alkyl group which optionally has a substituent or a functional group in a chain, R is a substituted or non-substituted C1-20 alkylene or phenylene group, and A is -COO or -SO3! and/or an ampho-ionic group represented by the formula: ¢wherein each R2 is the same or different and respectively indicates a C1-10 alkyl group which optionally has a substituent or a functional group in a chain, and R and A are as defined above! in a molecule and containing a resin having total acid value of 5 to 150.
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