# US 8,783,179 B2 · Support for planographic printing plate, method for producing support for planographic printing plate, and planographic printing original plate > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,783,179 B2 - Document ID: US8783179B2 - Status: Granted - Kind: B2 - Application number: 13/519,496 - Filed: 2010-12-22 - Published: 2012-11-29 - Granted: 2014-07-22 - Earliest claimed: 2009-12-28 - Assignees: FUJIFILM Corporation - Applicants: Shinya Kurokawa; Yoshiharu Tagawa; Hirokazu Sawada; Akio Uesugi - Inventors: Shinya Kurokawa; Yoshiharu Tagawa; Hirokazu Sawada; Akio Uesugi - Web page: https://patentgrep.com/patent/US8783179B2 ## CPC - B41N 1/083: {made of aluminium or aluminium alloys or having such surface layers (B41N1/086 takes precedence)} - B41N 3/034: {characterised by the electrochemical treatment of the aluminum support, e.g. anodisation, electro-graining; Sealing of the anodised layer; Treatment of the anodic layer with inorganic compounds; Colouring of the anodic layer} - C25D 11/12: Anodising more than once, e.g. in different baths - C25D 11/18: After-treatment, e.g. pore-sealing - C25D 11/20: Electrolytic after-treatment - C25D 11/24: Chemical after-treatment - 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 - C25D 11/08: containing inorganic acids - C25D 11/10: containing organic acids - B41N: PRINTING PLATES OR FOILS (photosensitive material G03); MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM - C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR - 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 Provided is a lithographic printing plate support that has excellent scratch resistance and is capable of obtaining a presensitized plate which exhibits excellent on-press developability and enables a lithographic printing plate formed therefrom to have a long press life and excellent deinking ability after suspended printing. The lithographic printing plate support includes an aluminum plate, and an aluminum anodized film formed thereon and having micropores which extend in a depth direction of the anodized film from a surface of the anodized film opposite from the aluminum plate. Each micropore has a large-diameter portion which extends to a depth of 5 to 60 nm (depth A) from the anodized film surface, and a small-diameter portion which communicates with the bottom of the large-diameter portion, further extends to a depth of 900 to 2,000 nm from the communication position and has a predetermined average diameter. ## Claims ### Claim 1 A lithographic printing plate support comprising: an aluminum plate; and an aluminum anodized film formed on the aluminum plate and having micropores which extend in a depth direction of the anodized film from a surface of the anodized film opposite from the aluminum plate, wherein each of the micropores has a large-diameter portion which extends to a depth of 5 to 60 nm (depth A) from the surface of the anodized film and a small-diameter portion which communicates with a bottom of the large-diameter portion and extends to a depth of 900 to 2,000 nm from a communication position, wherein an average diameter of the large-diameter portion at the surface of the anodized film is from 10 to 60 nm and a ratio of the depth A to the average diameter of the large-diameter portion (depth A/average diameter) is from 0.1 to 4.0, wherein a communication position average diameter of the small-diameter portion is more than 0 but less than 20 nm, and wherein a ratio of the average diameter of the small-diameter portion to the average diameter of the large-diameter portion (small-diameter portion diameter/large-diameter portion diameter) is up to 0.85. ### Claim 2 (depends on 1) The lithographic printing plate support according to claim 1, wherein the average diameter of the large-diameter portion is from 10 to 50 nm. ### Claim 3 (depends on 1) The lithographic printing plate support according to claim 1 wherein the depth A is from 10 to 50 nm. ### Claim 4 (depends on 1) The lithographic printing plate support according to claim 1, wherein the ratio of the depth A to the average diameter of the large-diameter portion is at least 0.30 but less than 3.0. ### Claim 5 (depends on 1) The lithographic printing plate support according to claim 1, wherein the micropores are formed at a density of 100 to 3,000 pcs/μm2. ### Claim 6 (depends on 1) A lithographic printing plate support-manufacturing method for manufacturing the lithographic printing plate support according to claim 1, comprising: a first anodizing treatment step for anodizing an aluminum plate; a pore-widening treatment step for increasing a diameter of micropores in an anodized film by bringing the aluminum plate having the anodized film obtained in the first anodizing treatment step into contact with an aqueous acid or alkali solution; and a second anodizing treatment step for anodizing the aluminum plate obtained in the pore-widening treatment step. ### Claim 7 (depends on 6) The lithographic printing plate support-manufacturing method according to claim 6, wherein a ratio between a thickness of the anodized film obtained in the first anodizing treatment step (first film thickness) and a thickness of the anodized film obtained in the second anodizing treatment step (second film thickness) (first film thickness / second film thickness) is from 0.01 to 0.15. ### Claim 8 (depends on 6) The lithographic printing plate support-manufacturing method according to claim 6, wherein the thickness of the anodized film obtained in the second anodizing treatment step is from 900 to 2,000 nm. ### Claim 9 (depends on 1) A presensitized plate comprising: the lithographic printing plate support according to claim 1; and an image recording layer formed thereon. ### Claim 10 (depends on 9) The presensitized plate according to claim 9, wherein the image recording layer is one in which an image is formed by exposure to light and unexposed portions are removable with printing ink and/or fountain solution. ### Claim 11 (depends on 2) The lithographic printing plate support according to claim 2 wherein the depth A is from 10 to 50 nm. ### Claim 12 (depends on 2) The lithographic printing plate support according to claim 2, wherein the ratio of the depth A to the average diameter of the large-diameter portion is at least 0.30 but less than 3.0. ### Claim 13 (depends on 3) The lithographic printing plate support according to claim 3, wherein the ratio of the depth A to the average diameter of the large-diameter portion is at least 0.30 but less than 3.0. ### Claim 14 (depends on 2) The lithographic printing plate support according to claim 2, wherein the micropores are formed at a density of 100 to 3,000 pcs/μm2. ### Claim 15 (depends on 3) The lithographic printing plate support according to claim 3, wherein the micropores are formed at a density of 100 to 3,000 pcs/μm2. ### Claim 16 (depends on 4) The lithographic printing plate support according to claim 4, wherein the micropores are formed at a density of 100 to 3,000 pcs/μm2. ### Claim 17 (depends on 2) A lithographic printing plate support-manufacturing method for manufacturing the lithographic printing plate support according to claim 2, comprising: a first anodizing treatment step for anodizing an aluminum plate; a pore-widening treatment step for increasing a diameter of micropores in an anodized film by bringing the aluminum plate having the anodized film obtained in the first anodizing treatment step into contact with an aqueous acid or alkali solution; and a second anodizing treatment step for anodizing the aluminum plate obtained in the pore-widening treatment step. ### Claim 18 (depends on 3) A lithographic printing plate support-manufacturing method for manufacturing the lithographic printing plate support according to claim 3, comprising: a first anodizing treatment step for anodizing an aluminum plate; a pore-widening treatment step for increasing a diameter of micropores in an anodized film by bringing the aluminum plate having the anodized film obtained in the first anodizing treatment step into contact with an aqueous acid or alkali solution; and a second anodizing treatment step for anodizing the aluminum plate obtained in the pore-widening treatment step. ### Claim 19 (depends on 4) A lithographic printing plate support-manufacturing method for manufacturing the lithographic printing plate support according to claim 4, comprising: a first anodizing treatment step for anodizing an aluminum plate; a pore-widening treatment step for increasing a diameter of micropores in an anodized film by bringing the aluminum plate having the anodized film obtained in the first anodizing treatment step into contact with an aqueous acid or alkali solution; and a second anodizing treatment step for anodizing the aluminum plate obtained in the pore-widening treatment step. ### Claim 20 (depends on 5) A lithographic printing plate support-manufacturing method for manufacturing the lithographic printing plate support according to claim 5, comprising: a first anodizing treatment step for anodizing an aluminum plate; a pore-widening treatment step for increasing a diameter of micropores in an anodized film by bringing the aluminum plate having the anodized film obtained in the first anodizing treatment step into contact with an aqueous acid or alkali solution; and a second anodizing treatment step for anodizing the aluminum plate obtained in the pore-widening treatment step.