Multicolor image forming method using multiply diazo resin layers

Claim 1

A multi-color image forming method utilizing a multi-color image forming material which is in the form of multiple layers on a support, and having, at least two photosensitive layers, the farthest layer from the support being the uppermost photosensitive layer, the photosensitive layers being formed from a water-soluble resin having photocrosslinking ability with diazo resin, a photosensitive water soluble, organic solvent insoluble diazo resin, and a water dispersible coloring agent which can produce a color tone, each photosensitive layer having a coloring agent which can produce a different color tone; and at least one intermediate layer, each intermediate layer being positioned between each photosensitive layer and the next adjacent photosensitive layer, the intermediate layer being formed from a hydrophobic, water-resistant, organic solvent softenable resin, said method comprising: (a) pattern exposing the uppermost photosensitive layer of the multi-color image forming material to light, (b) washing the exposed uppermost photosensitive layer with water in order to remove the non-exposed area and thereby form a colored pattern in the exposed area, (c) drying the multi-color image forming material, (d) pattern exposing with light the next photosensitive layer, through the intermediate layer above the photosensitive layer; (e) contacting the material with organic solvent to soften the resin in the intermediate layer, without dissolving or effecting any of the photosensitive layers, (f) washing with water to remove the intermediate layer and the non-exposed area of the next photosensitive layer, in order to form a pattern of a different color in the exposed area, (g) drying the material, (h) repeating steps d-g for each succeeding photosensitive layer when the multicolor image forming material has more than two photosensitive layers.