| 摘要 |
PURPOSE:To improve waste water processing property by developing a printing plate having a sensitive layer containing a diazo compound, a lipophilic high molecular compound and a development accelerator with a specific aqueous alkali developer. CONSTITUTION:The photosensitive planographic printing plate having the photosensitive layer containing the diazo compound, the lipophilic high molecular compound and the developing accelerator on a supporting body is developed with the aqueous alkali developer having <=pH 12 after image exposure and containing substantially no organic solvent. The diazo compound in the photosensitive layer is, for example, preferably a diazo resin represented by a condensation product of an aromatic diazonium salt and formaldehyde or acetoaldehyde. And as the development accelerator contained with the diazo compound and the lipophilic high molecular compound in the photosensitive layer, acid anhydride, long chain alcohols, phenolic hydroxide group containing material and cellulose are exemplified. Further, a print out material for forming visible image by exposure is added into the photosensitive composition. |
