| 摘要 |
PURPOSE:To improve color development density and to prevent background discoloration due to NOx contained in a waste gas by incorporating silica having a specified bulk density and a specified oil absorptivity in a precoat layer. CONSTITUTION:The silica to be added to the precoat layer has a bulk density of 100-170g/l and an oil absorptivity of 120-200ml/100g, and if the bulk density is below 100g/l, discoloration inhibition effect is not enough, if it is above 170g/l, color development density lowers, and if the oil absorptivity is below 120ml/100g, image part density lowers at the time of development, and if it is above 200ml/100g, background density rises. As a result, color development density can be improved and background discoloration due to NOx contained in a waste gas can be prevented. |
