# US 8,771,920 B2 · Lithographic printing plate precursor and method of preparing the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,771,920 B2 - Document ID: US8771920B2 - Status: Granted - Kind: B2 - Application number: 13/408,408 - Filed: 2012-02-29 - Published: 2012-10-04 - Granted: 2014-07-08 - Earliest claimed: 2011-03-31 - Assignees: FUJIFILM Corporation - Applicants: Shigekatsu Fujii; Norio Aoshima; Yoshinori Taguchi; Yoichiro Ara; Takashi Aridomi - Inventors: Shigekatsu Fujii; Norio Aoshima; Yoshinori Taguchi; Yoichiro Ara; Takashi Aridomi - Web page: https://patentgrep.com/patent/US8771920B2 ## CPC - G03F 7/039: Macromolecular compounds which are photodegradable, e.g. positive electron resists (G03F7/075 takes precedence; macromolecular quinonediazides G03F7/023) - B41C 1/1008: {by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials} - B41C 1/1016: {characterised by structural details, e.g. protective layers, backcoat layers or several imaging layers} - B41C 2201/04: Intermediate layers - B41C 2201/06: Backcoats; Back layers - B41C 2201/10: characterised by inorganic compounds, e.g. pigments - B41C 2201/14: characterised by macromolecular organic compounds, e.g. binder, adhesives - B41C 2210/02: Positive working, i.e. the exposed (imaged) areas are removed - B41C 2210/06: Developable by an alkaline solution - B41C 2210/14: Multiple imaging layers - B41C 2210/22: characterised by organic non-macromolecular additives, e.g. dyes, UV-absorbers, plasticisers - B41C 2210/24: characterised by a macromolecular compound or binder obtained by reactions involving carbon-to-carbon unsaturated bonds, e.g. acrylics, vinyl polymers - B41C 2210/266: Polyurethanes; Polyureas - G03F: PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR; (phototypographic composing devices B41B; photosensitive materials or processes for photographic purposes G03C; electrophotography, sensitive layers or processes therefor G03G) - B41C: PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES (photomechanical processes for producing printing surfaces G03F; photoelectrical processes for producing printing surfaces G03G) ## Abstract A lithographic printing plate precursor in a positive-type with an infrared-sensitivity, having a support and an image recording layer provided on the support, the support having a hydrophilic surface, the recording layer having a particular resin, an amphoteric surfactant and/or an anionic surfactant, and an infrared absorbing agent, wherein the particular resin being at least one of resins selected from the group consisting of a polyurethane resin, a poly (vinyl acetal) resin, and maleimide resin A. ## Claims ### Claim 1 A positive lithographic printing plate precursor with an infrared-sensitivity, having a support and an image recording layer provided on the support, the support having a hydrophilic surface, the recording layer comprising: a maleimide resin A; an amphoteric surfactant and/or an anionic surfactant; and an infrared absorbing agent; the maleimide resin A being a copolymer formed from monomers containing: methacrylic acid; at least one kind of compound selected from the group consisting of N-phenylmaleimide, N-cyclohexylmaleimide and N-benzylmaleimide; and a monomer having a structure represented by formula (A): wherein R21 represents a hydrogen atom or a methyl group; X represents an alkylene group having 2 to 12 carbon atoms, an oxyalkylene group having 4 to 8 carbon atoms or —SiRa2—; Ra represents an alkyl group and the two (2) alkyl groups represented by Ra may be the same as or different from each other; and m represents an integer of 1 to 3. ### Claim 2 (depends on 1) The lithographic printing plate precursor according to claim 1, wherein the image recording layer has a configuration in which a lower layer on the side of the support and an upper layer on the side opposite thereto are disposed on the support in this order, the upper layer and/or the lower layer comprising the maleimide resin A, the amphoteric surfactant and/or the anionic surfactant, and the infrared absorbing agent in the same layer, or in a separate layer. ### Claim 3 (depends on 1) The lithographic printing plate precursor according to claim 1, wherein the amphoteric surfactant is represented by any one of formulae (I) to (III): wherein R1 represents an alkyl group having 6 to 24 carbon atoms or an alkyl group through a particular connecting group; R2 and R3 each independently represent an alkyl group having 1 to 5 carbon atoms; R4 and R5 each independently represent an alkyl group having 1 to 5 carbon atoms, and at least one of R4 and R5 contains an acidic group or a salt thereof at the end of the alkyl group; L1 represents a linking group having 1 to 4 carbon atoms; and X″ represents a carboxylate ion, a sulfonate ion, a sulfate ion or a phosphate ion. ### Claim 4 (depends on 1) The lithographic printing plate precursor according to claim 1, wherein the anionic surfactant is represented by any one of formulae (IV) to (VI): wherein R6 represents an alkyl group having 6 to 24 carbon atoms; L12 represents a phenylene group or a single bond; D1, E1 and F1 each represent an sulfonate ion or a salt thereof, or an phosphate ion or a salt thereof; R7 represents an alkyl group having 4 to 18 carbon atoms; L13 represents a phenylene group or a naphthylene group; R8 represents a phenyl group or a naphthyl group; and L14 represents a polyalkyleneoxy group. ### Claim 5 (depends on 2) The lithographic printing plate precursor according to claim 2, wherein the surfactant is contained in an amount of 1% by mass or more and less than 20% by mass with respect to the total amount of the solid content of the layer containing the same, and the surfactant and the infrared absorbing agent are contained in the same layer, or in a separate layer. ### Claim 6 (depends on 1) The lithographic printing plate precursor according to claim 1, wherein the surfactant is contained in an amount of from 0.5% by mass to 40% by mass with respect to 100% by mass of the maleimide resin A. ### Claim 7 (depends on 1) The lithographic printing plate precursor according to claim 1, wherein the lithographic printing plate precursor has an undercoat layer, a lower layer for forming the recording layer and an upper layer for forming the recording layer in this order as layers on the support. ### Claim 8 (depends on 2) The lithographic printing plate precursor according to claim 2, wherein the maleimide resin A is contained in the lower layer of the recording layer. ### Claim 9 (depends on 2) The lithographic printing plate precursor according to claim 2, wherein the surfactant is contained in the same layer as the layer containing the maleimide resin A. ### Claim 10 (depends on 1) A method of making a lithographic printing plate, comprising, in the following order: subjecting the recording layer of the lithographic printing plate precursor according to claim 1 to image-wise exposure; and developing the lithographic printing plate precursor using an alkaline aqueous solution which has a pH of from 11.0 to 13.5. ### Claim 11 (depends on 10) The method of making a lithographic printing plate according to claim 10, wherein the aqueous alkali solution comprises an anionic surfactant or a nonionic surfactant.