# US 2016/0259243 A1 · Negative-working lithographic printing plate precursor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2016/0259243 A1 - Document ID: US20160259243A1 - Status: Published application - Kind: A1 - Application number: 14/636,240 - Filed: 2015-03-03 - Published: 2016-09-08 - Earliest claimed: 2015-03-03 - Assignees: Eastman Kodak Company - Applicants: Eastman Kodak Company - Inventors: Eiji Hayakawa; Masamichi Kamiya; Yoshiaki Shekiguchi; Koji Hayashi - Web page: https://patentgrep.com/patent/US20160259243A1 ## CPC - G03F 7/027: Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds (G03F7/075 takes precedence) - B41C 1/10: for lithographic printing; Master sheets for transferring a lithographic image to the forme {(chemical or electrical pretreatment B41N3/03)}(neutralising or similar differentiation treatments of lithographic printing formes B41N3/08) - 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} - G03F 7/038: Macromolecular compounds which are rendered insoluble or differentially wettable (G03F7/075 takes precedence; macromolecular azides G03F7/012; macromolecular diazonium compounds G03F7/021) - B41C 2210/04: Negative working, i.e. the non-exposed (non-imaged) areas are removed - B41C 2210/08: Developable by water or the fountain solution - 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 2210/26: characterised by a macromolecular compound or binder obtained by reactions not involving carbon-to-carbon unsaturated bonds - 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 negative-working lithographic printing plate precursor has a substrate and an imageable layer disposed on the substrate. This imageable is removable with a lithographic printing ink, a fountain solution, or both. The imageable layer comprises (A) a free radical polymerizable compound, (B) a free radical polymerization initiator, and (C) a polymer that has a polysaccharide backbone and a free radical polymerizable group that is different than (A). Such precursors are on-press developable and exhibit excellent on-press development stability over time and excellent printing properties. ## Claims ### Claim 1 A negative-working lithographic printing plate precursor, comprising: a substrate and a negative-working imageable layer disposed on the substrate, wherein: the imageable layer is removable by a lithographic printing ink or a fountain solution, or both a lithographic printing ink and a fountain solution, and the imageable layer comprises: (A) at least one free radical polymerizable compound, (B) at least one free radical polymerization initiator, and (C) at least one polymer which has a polysaccharide backbone and a radical polymerizable group that is connected to the polysaccharide backbone via a linkage comprising two urea bonds, two urethane bonds, or a urea bond and a urethane bond, and the polymer is different from (A). ### Claim 2 (depends on 1) The negative-working lithographic printing plate precursor of claim 1, wherein the polysaccharide in (C) is cellulose or a derivative thereof. ### Claim 3 (depends on 1) The negative-working lithographic printing plate precursor of claim 1, wherein the free radical polymerizable group of (C) is bonded to the polysaccharide backbone via either two urethane bonds or two urea bonds. ### Claim 4 (depends on 1) The negative-working lithographic printing plate precursor according to claim 1, wherein (C) is derived from, at least, a polysaccharide, a polyisocyanate, and either an alcohol other than a polysaccharide or an amine, or both an alcohol other than a polysaccharide or an amine. ### Claim 5 (depends on 4) The negative-working lithographic printing plate precursor of claim 4, wherein the alcohol other than a polysaccharide or amine has the free radical polymerizable group. ### Claim 6 (depends on 1) The negative-working lithographic printing plate precursor of claim 1, wherein (C) has at least one poly(alkyleneoxide)moiety. ### Claim 7 (depends on 1) The negative-working lithographic printing plate precursor of claim 1, wherein the free radical polymerizable group of (C) is linked to the polysaccharide backbone via a spacer comprising the poly(alkyleneoxide) moiety. ### Claim 8 (depends on 1) The negative-working lithographic printing plate precursor of claim 1, wherein (C) is present in the imageable layer in an amount of at least 1% and up to and including 50% by mass, based on the total mass of the imageable layer. ### Claim 9 (depends on 1) The negative-working lithographic printing plate precursor of claim 1, wherein (A) has at least one poly(alkyleneoxide) moiety. ### Claim 10 (depends on 1) The negative-working lithographic printing plate precursor of claim 1, wherein (A) is a multi-functional urethane acrylate. ### Claim 11 (depends on 1) The negative-working lithographic printing plate precursor of claim 1, wherein (B) comprises a heat-polymerization free radical polymerization initiator. ### Claim 12 (depends on 11) The negative-working lithographic printing plate precursor of claim 11, wherein the imageable layer further comprises (E) a photothermal conversion material. ### Claim 13 (depends on 1) The negative-working lithographic printing plate precursor of claim 1, wherein the imageable layer further comprises (D) at least one particulate polymer binder other than (C). ### Claim 14 (depends on 1) A method for preparing a lithographic printing plate, comprising: on-press developing a negative-working lithographic printing plate precursor of claim 1. ### Claim 15 (depends on 14) The method of claim 14, comprising: imagewise exposing the negative-working lithographic printing plate precursor to provide an imagewise exposed precursor; mounting the imagewise exposed precursor onto a printing press; and on-press developing the imagewise exposed precursor by contacting it with either a lithographic printing ink, a fountain solution, or both a lithographic printing ink and a fountain solution. ### Claim 16 (depends on 14) The method of claim 14, comprising: mounting the negative-working lithographic printing plate precursor onto a printing press to provide a mounted precursor; imagewise exposing the mounted precursor to provide an imagewise exposed precursor; and on-press developing the imagewise exposed precursor by contacting it with either a lithographic printing ink, a fountain solution, or both a lithographic printing ink and fountain solution.