Abstract: A photosensitive planographic printing plate precursor comprising an aluminum substrate surface treated such that the center line surface roughness thereof (Ra) is in a range of from 0.30 &mgr;m or more to 0.55 &mgr;m or less and a photosensitive layer provided on the substrate and comprised of a photosensitive composition containing (a) a water-soluble or water-dispersible polymer, (b) a monomer or oligomer having at least one ethylenically unsaturated double bond capable of photopolymerization, and (c) a photopolymerization initiation system having &lgr;max in a range of from 330 nm or more to 375 nm or less such that the light absorbance A at &lgr;max and the absorbance B at 400 nm fulfill a relationship of B/A<0.1. A preferred example of (a) the water-soluble polymer is a polymer containing a sulfonic acid (salt) group.

Abstract: A radiant ray-sensitive lithographic printing plate precursor which comprises (a) material or material series which absorbs radiant rays, converts the absorbed radiant rays to heat, and enters into a self-exothermic reaction by the heat, and (b) material or material series which causes a chemical change or a physical change by the reaction heat generated as a result of the self-exothermic reaction.

Abstract: A heat-sensitive lithographic printing plate precursor, comprising a support having a hydrophilic surface on which (1) a thermal polymerization layer comprising an aqueous alkali-soluble polymer having addition polymerizable unsaturated bonds at its side chains and a thermal polymerization initiator and (2) a water-soluble overcoat layer comprising a water-soluble polymer and a compound capable of converting light into heat are provided in this order.

Abstract: A radiation-sensitive planographic printing plate which is excellent in terms of durability wherein development with water, or direct production of the plate from digital data through infrared laser recording in particular such that a special process is not necessary, is possible, by forming on a support a photosensitive layer containing a reaction product of a compound having in a molecule thereof a functional group X and a functional group Y and a compound represented by a formula (1) stated below, or alternatively, containing a polymerization product of a compound having the functional group X and a compound represented by the formula (1) stated below. Further by incorporating water-insoluble particles in this photosensitive layer, many voids are formed in the photosensitive layer, further improving sensitivity and discrimination.

Abstract: The present invention provide a planographic printing plate comprising a substrate having thereon a recording layer which comprises at least one of a polymer compound carrying on a side chain a functional group which generates sulfonic acid under influence of an acid, base or heating; and a photo acid-generating agent or acid-generating agent; thermal base-generating agent; or an infrared ray absorbing agent, and by this structure, a high sensitive positive type planographic printing plate which can be developed with water or requires no developing is provided.

Abstract: The object of the present invention is to provide a planographic original plate which can be engraved directly according to digital signals by laser beams and which can be water-developed or can be used directly for printing without a developing process. This objective has been achieved by a planographic original plate comprising a substrate and a photosensitive layer which is supported by the substrate and which contains a polymeric compound having as a side chain at least one structural unit selected from the structural units represented by the general formulas (1) to (3).General Formula (1)--SO.sub.3 --CH.sub.2 --L.sub.n --O--ZIn the general formula (1), L represents a linking group composed of a non-metallic atom. --O--Z represents a group which is decomposed by an acid to become --OH. n is 0 or 1.General Formula (2)--SO.sub.3 --L--W.sup.1In the general formula (2), W.sup.

Abstract: A novel methoxymethyl- or hydroxymethyl-containing phenol compound represented by the following formula (I), (II), (III), (IV) or (V) is disclosed: ##STR1## wherein each R represents CH.sub.2 OCH.sub.3, CH.sub.2 OH, or H, provided that at least three of the R's are CH.sub.2 OCH.sub.3 or CH.sub.2 OH, with at least one thereof being CH.sub.2 OCH.sub.3 ; each R.sub.1 represents CH.sub.2 OCH.sub.3, CH.sub.2 OH, or H, provided that at least two of the R.sub.1 's are CH.sub.2 OH; and each R.sub.2 represents CH.sub.2 OCH.sub.3, CH.sub.2 OH, or H, provided that at least two of the R.sub.2 'S are CH.sub.2 OH.

Abstract: An image forming layer comprising a polymer which has a component showing UV absorption at 320 nm or higher and a component containing the carboxylic acid (carboxylate) group represented by the following general formula I:--(Y).sub.1 --X--(CH.sub.2).sub.k --COOT (I)wherein X represents sulfur, oxygen, single bond, C.dbd.W or N--U where W represents oxygen or sulfur and U represents an optionally substituted aryl, alkyl group or hydrogen, Y represents an optionally substituted alkylene, arylene, aralkylene group or divalent heterocyclic ring, and T represents a hydrogen, alkali metal, alkaline earth metal or HN(R.sup.1)(R.sup.2)(R.sup.3) where R.sup.1, R.sup.2 and R.sup.3, which may be identical or different, independently represent a hydrogen atom, optionally substituted alkyl or aryl group and R.sup.1, R.sup.2 and R.sup.3 may join together to form a ring structure, k represents 0 or 1 and 1 is 0 or 1, provided that X represents C.dbd.W when k is 0.

Abstract: A photosensitive composition is described, comprising a diazonium compound and a polyurethane resin having a carboxyl group in its main chain. The composition can be developed with an aqueous alkali developer to provide a lithographic printing plate having a long press life.

Abstract: The present invention relates to an image-forming layer which comprises a polymer having a carboxyl group-containing group which can be decarboxylated by exposure. According to the present invention, an image-forming layer having an improved coating strength and adhesion to a support, can be obtained.

Abstract: A light-sensitive composition which contains a polyurethane resin having a carbon-carbon unsaturated bond and a carboxyl group. A presensitized plate using the above light-sensitive composition can be developed with an aqueous alkaline developing solution and provides a lithographic printing plate having excellent printing durability.

Abstract: A photopolymerizable composition is described, comprising an addition polymerizable unsaturated compound having at least two ethylenically unsaturated double bonds per molecule, a photopolymerization initiator, and a binder, wherein said binder is a copolymer represented by formula (I) ##STR1## wherein Ar.sup.1 and Ar.sup.2 each represent a substituted or unsubstituted phenyl group; and n.sub.1, n.sub.2, n.sub.3, and n.sub.4 each represents mol % of the respective repeating unit, wherein n.sub.1 is from 0 to about 70; n.sub.2 is from 0 to about 70; n.sub.3 is from about 5 to 50; and n.sub.4 is from about 5 to 50; provided that n.sub.1 and n.sub.2 are not 0 at the same time, the sum of n.sub.3 and n.sub.4 is from about 30 to 80. The composition is useful as an alkali-developable light-sensitive layer which provides a photosensitive dry film resist having excellent performance characteristics.

Abstract: The present invention relates to a light-sensitive composition comprising a modified polyvinyl acetal resin having a substituent possessing an acid hydrogen atom introduced into remaining hydroxy groups of a polyvinyl acetal resin in an amount of from 0.1 to 6 milliequivalents as acid content per 1 gram resin, and a diazo resin represented by the formula (I) ##STR1## wherein R.sub.1 represents a hydrogen atom, or a substituted or unsubstituted alkyl, alkoxy, hydroxy, carboxyester or carboxy group; R.sub.2 represents a hydrogen atom, an alkyl group having 1 to 3 carbon atoms or a phenyl group; R.sub.3 represents a hydrogen atom or an alkoxy group having 1 to 3 carbon atoms; R.sub.4 represents an alkyl group having 6 to 18 carbon atoms; n represents an integer not smaller than 2.The presensitized lithographic printing plate using the light-sensitive composition of the present invention can be developed with an alkali developer and the highlight image thereof is tough.

Abstract: A light-sensitive composition comprising a diazonium compound and a polymer having the recurring units represented by the following general formula (I): ##STR1## wherein R.sub.1 represents a hydrogen atom or a substituted or unsubstituted alkyl group; R.sub.2 represents an unsubstituted alkyl group; R.sub.3 represents an aliphatic or aromatic hydrocarbon group having a carboxyl group; R.sub.4 represents an aliphatic or aromatic hydrocarbon group which has at least one hydroxyl or nitrile group and which may be further substituted; n.sub.1, n.sub.2, n.sub.3, n.sub.4 and n.sub.5 represent the molar percents of the respective recurring units, provided that n.sub.1 is from about 5 to about 85 mol %, n.sub.2 is from 0 to about 60 mol %, n.sub.3 is from 0 to about 20 mol %, n.sub.4 is from about 3 to about 60 mol % and n.sub.5 is from greater than 0 to about 60 mol %.

Abstract: A photopolymerizable composition is described, comprising an addition polymerizable unsaturated compound having at least two ethylenically unsaturated double bonds in the molecule, a photopolymerzation initiator, and a binder, said binder being a copolymer composed of at least one recurring unit of group (A), at least one recurring unit of group (B), and at least can recurring unit of group (C), and having a weight average molecular weight of 5,000 to 5,000,000, wherein(A) is a methacrylate or benzyl methacrylate unit having a glass transition point of the homopolymer of higher than 50.degree. C. and having an alkyl group having from 3 to 10 carbon atoms,(B) is an acrylate unit having a glass transition point of the homopolymer of lower than 110.degree. C. and having an alkyl group having from 1 to 6 carbon atoms, and(C) is an .alpha.,.beta.