Abstract: An image formation method in which a photosensitive element is exposed in image-wise fashion, then, a first treating element comprising a treating layer comprising a base and/or base precursor is prepared, this first treating element is laminated on the photosensitive element so that the treating layer of the first treating element faces the photosensitive layer of the photosensitive element and the resultant laminate is heated for 5 to 60 seconds at a temperature of 60 to 100.degree. C. in the presence of water in an amount of 1 cc/m.sup.2 to 50 cc/m.sup.2 between the photosensitive layer of the photosensitive element and the treating layer of the first treating element. Then the photosensitive element is separated from the first treating member. Then a second treating element comprising a support carrying thereon a treating layer comprising at least an acidic polymer is prepared.

Abstract: Methods of forming color images having excellent graininess and sharpness by simple heat development processing are disclosed.

Abstract: Methods of forming color images having excellent graininess and sharpness by simple heat development processing are disclosed.

Abstract: Provided are a processing material used for forming images on a heat-developable photosensitive material by heating the processing material and the photosensitive material in a condition that they are brought into face-to-face contact, with the processing material comprising a long web support, preferably having a thickness of from 4 to 40 .mu.m, provided thereon a processing layer, preferably comprising a base or a precursor of bases; and a method of forming images on a heat-developable photosensitive material, which comprises a step of supplying a fountain water to the photosensitive material, a step of bringing the dampened photosensitive material into face-to-face contact with the aforesaid processing material and a step of applying heat thereto.

Abstract: A bisguanidine salt selected from the group consisting of a 4-(phenylsulfonyl)phenylsulfonylacetic acid salt of N,N'-bis(1,3-diethylguanyl)ethylenediamine, a 4-(phenylsulfonyl)phenylsulfonylacetic acid salt of N,N'-bis(1,3-diisopropylguanyl)ethylenediamine, a 4-(phenylsulfonyl)phenylsulfonylacetic acid salt of N,N'-bis-(imidazoline-2-yl)ethylenediamine, a 4-(phenylsulfonyl)-phenylsulfonylacetic acid salt of 1,4-bis(1,3-diisopropylguanyl)piperazine, a 4-(phenylsulfonyl)phenylsulfonylacetic acid salt of 1,4-bis(1,3-diethylguanyl)piperazine, a 4-(4-methylphenylsulfonyl)phenylsulfonylacetic acid salt of N,N'-bis(1,3-diethylguanyl)ethylenediamine and a 4-(4-ethylphenylsulfonyl)phenylsulfonylacetic acid salt of 1,4-bis(1,3-diethylguanyl)piperazine which can be used as a base precursor which is rapidly decomposed by heat treatment at 120.degree. C. or less to release a base.

Abstract: A dry type image formation process which comprises imagewise exposing a heat-developable photosensitive material to light, and then heat-developing the heat-developable photosensitive material, wherein the heat-developable photosensitive material further comprises a component isolated by microcapsules and the heat-developable photosensitive material is pressed before or after heat development so that the microcapsules are ruptured to release the internal phase and cause the component to be diffused into the photosensitive layer, allowing its function to be fulfilled, and an image formation process which comprises heat-developing a heat-developable photosensitive material after or simultaneously with imagewise exposing, the heat-developable photosensitive material comprising a photosensitive silver halide, a reducing agent, a basic precursor, a dye-providing substance which undergoes heat development to release or produce a dye, and a silver halide fixing agent which is a compound capable of fixing and stabili

Abstract: A light-sensitive material and an image recording method using the same are disclosed. The material comprises a support having provided thereon a light sensitive layer containing at least a light-sensitive silver halide, a reducing agent, a polymerizable compound, and a color image forming substance, wherein at least the polymerizable compound and the color image forming substance are encapsulated in the same microcapsules. The material exhibits high sensitivity and excellent stability with time.

Abstract: A recording material comprising (i) an addition polymerizable compound having at least one ethylenic unsaturated double bond, (ii) a photopolymerization initiator composition and (iii) at least one component capable of causing a color reaction, wherein components (i), (ii) and (iii) are contained in microcapsules; and wherein said photopolymerization initiator composition (ii) comprises the following components (a), (b) and (c), whereby the light sensitivity of the recording material is improved:(a) a photo-absorbent having a molecular extinction coefficient of 10.sup.3 or more at a maximum absorption wavelength;(b) a hexaaryl-biimidazole; and(c) a heterocyclic mercapto compound of general formula (I): ##STR1## where Z is a non-metallic atomic group for formation of a nitrogen-containing heterocyclic nucleus.

Abstract: A photodegradable microcapsule is described which has a wall made of a polymer coat having an acid-decomposable bond selected from a silylether bond and a silylureido bond and which contains a compound that generates an acid upon light irradiation.

Abstract: A high sensitivity photopolymerizable composition is disclosed. The composition includes a polymerizable compound having an ethylenically unsaturated bond and a photopolymerizable initiator represented by the general formula (I). ##STR1## The substituents within general formula (I) are defined within the specification. The composition has improved sensitivity and the initiator provides an increased polymerization rate. The composition may further include Michler's ketone and a N-methyl-2-benzoyl-.beta.-naphthothiazolin.

Abstract: A photopolymerizable composition having an improved sensitivity, which comprises a polymerizable compound having an ethylenically unsaturated bond and a photopolymerization initiator, wherein said photopolymerization initiator comprises a compound represented by general formula I ##STR1## wherein R.sup.1 and R.sup.2 each represents a hydrogen atom, an alkyl group, a substituted alkyl group, an aryl group, a substituted aryl group, or an aralkyl group; X represents a substituent having a Hammett's value of not more than 0.7; and Y represents a hydrogen atom, an alkyl group, a substituted alkyl group, an aryl group, a substituted aryl group, an aralkyl group, an acyl group, or an alkoxycarbonyl group and a 1,3,5-triazine compound represented by general formula II ##STR2## wherein R.sup.3, R.sup.4, and R.sup.