Sanyo-kokusaku Pulp Co., Ltd.

Kuniaki Monden

Hisashi Mino

Norio Yabe

Takeshi Iijima

Hideaki Sasaki

A positive type photosensitive composition developable with water or warm water alone of water-soluble photocrosslinking agent, water-soluble resin and synthetic resin emulsion and further a coloring agent, if necessary.

Positive type photosensitive composition developable with water

An improvement in a multicolor image-forming method and a multicolor image-forming material applied to the same, employing a heat transfer photosensitive material comprising a transparent substrate, a colored layer which is soluble in water but insolubilizable by light, and a heat-fusible and bondable intermediate layer therebetween.

Multicolor image-forming method

Method of forming a positive-positive type image is disclosed, which is characterized in that a photosensitive layer is formed on a substrate using a composition comprising water-soluble photo-crosslinking agent, water-soluble resin and synthetic resin emulsion and further coloring agent, if necessary, said photosensitive layer is exposed to active rays through manuscript, then this is immersed into warm water of 30.degree. to 60.degree. C. for not less than 3 seconds to allow the exposed area to swell and soften sufficiently with warm water and simultaneously to allow almost all water-soluble photo-crosslinking agent in the nonexposed area to dissolve out into warm water, and successively the swollen and softened exposed area is rubbed out to form an image having no coloring originating from water-soluble photo-crosslinking agent without using the development chemicals except water.

Method of forming an image

Multicolor image products useful for prepress color proofing. The products are laminates of a transfer support sheet; an adhesive layer of a heat-fusible and bondable material on a surface of said transfer support sheet; an image layer of a first color provided on the adhesive layer and having image areas of a water-insoluble resin component and non-image areas, the image areas being bonded to the surface of the adhesive layer; and one, two or three additional image layers each of a different color other than that of the first image layer. Each image layer is separated from another image layer by an intermediate layer of a material which is harmless to hue and transparency and has opposed first and second surfaces, the second surface being adhered to the image areas of the image layer closer to the transfer support sheet and to the adhesive layer or other intermediate layer at the non-image areas and being non-sticky at room temperature, heat-fusible and directly transferable to another heat-fusible surface at a temperature which prevents dimensional change and deformation of the surfaces so as to provide exact registration of the image layers and water-insoluble. The first surface of each intermediate layer is adhered to the image areas of the image layer farther from the transfer support sheet and to any additional intermediate layer and has the characteristics of the second surface except that the first surface is not required to be water-insoluble. An intermediate layer is also provided as the outermost layer of the laminate.

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Sakado, Japan

Kuniaki Monden