Abstract: A photosensitive composition containing: (A) a sensitizing dye; (B) a photopolymerization initiator; (c) a polymerizable compound having an ethylenically unsaturated bond; and (D) a polymer binder, wherein the photopolymerization initiator exhibits a reaction rate constant with a semiquinone radical anion in the range of 2.0×102 to 1.0×108 (mol?1·l·s?1).

Abstract: Disclosed are a planographic printing plate material and a planographic printing plate preparing process, the planographic printing plate material comprising a support and provided thereon, an image formation layer containing a colorant (a) having an absorption band in a wavelength region of from 700 to 1200 nm, a polymerization initiator (b) and a polymerizable ethylenically unsaturated compound (c), the image formation layer being an outermost layer, wherein the polymerization initiator (c) is a compound represented by the following formula (1), R1—C(X)2—(C?O)—(Y)n—R2??Formula (1)

Abstract: Disclosed is a process of preparing a planographic printing plate from a light sensitive planographic printing plate material comprising a hydrophilic support and provided thereon, an image formation layer containing (A) a polymerization initiator selected from a hexaarylbisimidazole compound and a diazo resin, and (B) an alkali soluble resin with an acid value of 5 to 200 having an acryloyl group or a methacryloyl group, the alkali soluble resin being obtained by reacting a vinyl copolymer having a monomer unit derived from acrylic acid or methacrylic acid with an epoxy compound having an acryloyl group or a methacryloyl group in the molecule, and, the process comprising the steps of imagewise exposing the light sensitive planographic printing plate material to ultraviolet laser, and removing an image formation layer at non-exposed portions with an aqueous alkali solution to form an image.

Abstract: Disclosed is a process of preparing a planographic printing plate from a light sensitive planographic printing plate material comprising a hydrophilic support and provided thereon, an image formation layer containing (A) a polymerization initiator selected from an arene-iron complex and a tribromoacetyl compound, (B) a polymerizable ethylenically unsaturated compound, and (C) an alkali soluble resin with an acid value of 5 to 200, the process comprising the steps of imagewise exposing the light sensitive planographic printing plate material to ultraviolet light using an exposure device comprising a digital mirror device (DMD), and removing an image formation layer at non-exposed portions with an aqueous alkali solution to form an image.

Abstract: Disclosed is a process of preparing a planographic printing plate from a light sensitive planographic printing plate material comprising a hydrophilic support and provided thereon, an image formation layer containing (A) at least one polymerization initiator selected from an arene-iron complex and a tribromoacetyl compound, (B) a polymerizable ethylenically unsaturated compound, and (C) an alkali soluble resin with an acid value of 5 to 200, the process comprising the steps of imagewise exposing the light sensitive planographic printing plate material to ultraviolet laser, and removing an image formation layer at non-exposed portions with an aqueous alkali solution to form an image.

Abstract: Disclosed is a process of preparing a planographic printing plate from a light sensitive planographic printing plate material comprising a hydrophilic support and provided thereon, an image formation layer containing (a) an alkali soluble resin with an acid value of 5 to 200 having an acryloyl group or a methacryloyl group, the alkali soluble resin being obtained by reacting a vinyl copolymer having a monomer unit derived from acrylic acid or methacrylic acid with an epoxy compound having an acryloyl group or a methacryloyl group in the molecule, and (b) a diazo resin, the process comprising the steps of imagewise exposing the light sensitive planographic printing plate material to ultraviolet light using an exposure device comprising a digital mirror device (DMD), and removing an image formation layer at non-exposed portions with an aqueous alkali solution to form an image.

Abstract: Disclosed is a light sensitive planographic printing plate material comprising a hydrophilic support and provided thereon, a light sensitve layer containing (A) an infrared absorbing dye, (B) a radical generating agent, and (C) a radically polymerizable compound, the light sensitve layer being an outermost layer, wherein the radical generating agent is selected from the group consisting of a sulfonium salt, a iodonium salt and a diazonium salt, and the radically polymerizable compound is a radically polymerizable oxirane compound having an oxirane ring in the molecule.

Abstract: Disclosed are a light sensitive composition containing A) an addition polymerizable ethylenically double bond-containing monomer, B) a photopolymerization initiator, and C) a polymer binder, wherein the addition polymerizable ethylenically double bond-containing monomer is a reaction product of a tertiary amine having two or more hydroxyl groups in the molecule, a diisocyanate having an aromatic ring in the molecule and a compound having a hydroxyl group and an addition polymerizable ethylenically double bond in the molecule, and a light sensitive planographic printing plate precursor comprising the light sensitive composition.

Abstract: Disclosed are a planographic printing plate material and a planographic printing plate preparing process, the planographic printing plate material comprising a support and provided thereon, an image formation layer containing a colorant (a) having an absorption band in a wavelength region of from 700 to 1200 nm, a polymerization initiator (b) and a polymerizable ethylentically unsaturated compound (c), wherein the polymerization initiator (c) is a compound represented by the following formula (1), R1—CX2—(C?O)—R2??Formula (1)

Abstract: Disclosed is a light sensitive composition comprising an addition polymerizable ethylenically unsaturated monomer A), a photopolymerization initiator B), a polymer binder C), and a cation-polymerization compound D), wherein the photopolymerization initiator D) is an iron-arene complex.

Abstract: Disclosed is a light sensitive composition containing a compound represented by the following formula (1): wherein R1, R2 and R3 independently represent a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group, provided that R1 and R2 may combine with each other to form a ring or R2 and R3 may combine with each other to form a ring.

Abstract: A photosensitive composition exhibiting enhanced sensitivity is disclosed, comprising an ethylenically unsaturated monomer, a photopolymerization initiator composition and a polymer binder, wherein the photopolymerization initiator composition contains a polyhalogen compound. There is also disclosed a photosensitive lithographic printing plate comprising the foregoing photosensitive composition on a support having a hydrophilic surface.

Abstract: A planographic printing plate manufacturing method is disclosed which comprises the step of developing a presensitized planographic printing plate with a developer with a pH of from 11.5 to less than 12.5 which does not substantially contain an organic solvent, wherein the presensitized planographic printing plate comprises a support having a roughened hydrophilic surface with a center line average surface roughness Ra of from 0.5 to 0.8 &mgr;m, and provided thereon, a photopolymerizable light sensitive layer and an oxygen shielding layer in that order, the photopolymerizable light sensitive layer containing A) an addition polymerizable monomer having an ethylenic double bond, B) a photopolymerization initiator, C) a sensitizing dye, and D) a polymer binder, and the oxygen shielding layer containing E) polyvinyl alcohol and F) polyvinyl pyrrolidone.

Abstract: Disclosed are a light sensitive composition containing A) an addition polymerizable ethylenically double bond-containing monomer, B) a photopolymerization initiator, and C) a polymer binder, wherein the addition polymerizable ethylenically double bond-containing monomer is a reaction product of a tertiary amine having two or more hydroxyl groups in the molecule, a diisocyanate having an aromatic ring in the molecule and a compound having a hydroxyl group and an addition polymerizable ethylenically double bond in the molecule, and a light sensitive planographic printing plate precursor comprising the light sensitive composition.

Abstract: A photothermographic recording material comprising on one side of a support an image recording layer comprising a light-insensitive organic silver salt, a photosensitive silver halide, a reducing agent for silver ions and a binder, wherein the difference in specular glossiness at an angle of 60° between a thermally developed exposed area of the image recording layer and the bottom support surface opposite the exposed area of the recording material is at least 15.

Abstract: Disclosed is a light sensitive composition containing a compound represented by the following formula (1): formula (1) 1

Abstract: A planographic printing plate manufacturing method is disclosed which comprises the step of developing a presensitized planographic printing plate with a developer with a pH of from 11.5 to less than 12.5 which does not substantially contain an organic solvent, wherein the presensitized planographic printing plate comprises a support having a roughened hydrophilic surface with a center line average surface roughness Ra of from 0.5 to 0.8 &mgr;m, and provided thereon, a photopolymerizable light sensitive layer and an oxygen shielding layer in that order, the photopolymerizable light sensitive layer containing A) an addition polymerizable monomer having an ethylenic double bond, B) a photopolymerization initiator, C) a sensitizing dye, and D) a polymer binder, and the oxygen shielding layer containing E) polyvinyl alcohol and F) polyvinyl pyrrolidone.

Abstract: A photothermographic recording material comprising on one side of a support an image recording layer comprising a light-insensitive organic silver salt, a photosensitive silver halide, a reducing agent for silver ions and a binder, wherein the difference in specular glossiness at an angle of 60° between a thermally developed exposed area of the image recording layer and the bottom support surface opposite the exposed area of the recording material is at least 15.

Abstract: A photosensitive composition comprising (1) a compound having at least one addition-polymerizable ethylenically unsaturated double bond, (2) an acidic vinyl copolymer soluble or swellable in alkaline water, which contains, in its molecule, a vinyl monomer having an aromatic hydroxyl group, as a constituting unit, (3) a photopolymerization initiator, and (4) a diazo resin, wherein the diazo resin is a copolycondensed compound which contains, in its molecule, an aromatic compound having a carboxyl group and/or a hydroxyl group, and an aromatic diazonium compound, as constituting units.

Abstract: Disclosed is a light-sensitive composition which comprises(A) a diazo resin and(B) an alkali-soluble and swellable polymer compound, said polymer compound being a vinyl copolymer containing, as a constitutional unit, 0.1 to 10 mole % of a structure derived from an ester of acrylic acid or methacrylic acid having an alkyl group with 8 or more carbon atoms.