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Lithographic process involving on press development

A technology of lithographic printing and lithographic printing plates, which is applied in the field of lithographic printing and can solve problems such as poor wear resistance of printing plates

Inactive Publication Date: 2005-02-09
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Image elements containing particles suitable for print development typically exhibit poor printing plate abrasion resistance

Method used

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  • Lithographic process involving on press development
  • Lithographic process involving on press development
  • Lithographic process involving on press development

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0167] (Synthesis of sulfonium ion C10))

[0168] In 800ml of benzene, 50.9g of diphenylsulfoxide was dissolved. To the solution, 200 g of ammonium chloride was added. The mixture was refluxed for 24 hours. The reaction mixture was ice-cooled, and gradually poured into 2 liters of water. To the mixture was added 400 ml of concentrated hydrochloric acid. The reaction mixture was heated at 70°C for 10 minutes. The resulting aqueous solution was washed with ethyl acetate and filtered. A solution of 200 g ammonium iodide in 400 ml water was added to the filtrate.

[0169] The precipitated powder was filtered, washed with water, washed with ethyl acetate, and dried to obtain 70 g of triphenylsulfonium iodide.

[0170] (synthesis of salt (1))

[0171] In 100 ml of methanol, 7.8 g of triphenylsulfonium iodide was dissolved. To the solution, 4.87 g of silver oxide was added. The mixture was stirred at room temperature for 4 hours. Filter the solution. To the filtrate was ad...

Embodiment 2

[0174] (synthesis of salt (3))

[0175] In 100 ml of methanol, 7.8 g of triphenylsulfonium iodide prepared in Synthesis Example 1 was dissolved. 4.87 g of silver oxide were added to the solution. The mixture was stirred at room temperature for 4 hours. Filter the solution. 2.20 g of concentrated sulfuric acid was added to the filtrate to start the reaction. The reaction mixture was concentrated. The concentrate was washed with ethyl acetate and hexanes and dried in vacuo to give a solid.

[0176] The resulting solid was washed with ethyl acetate and hexane, and dried again in vacuo to yield 6.48 g of salt (3).

[0177] Other salts can also be prepared by appropriately changing the starting materials and adjusting the reaction conditions in a similar manner to the Synthetic Examples.

[0178] The synthesis of sulfonium salts is described in J. Amer. Chem. Soc.; 91; 1969; 145-150.

[0179] It is preferable that the maximum absorption wavelength of the salt of a sulfonium ...

Embodiment 3

[0230] (Synthesis of ethyl 4-hydroxy-3,5-dimethylbenzoylformate)

[0231] With 350ml of nitrobenzene, mix with 133g of aluminum chloride at room temperature. The mixture was maintained at 0 to 10°C. To the mixture, 136.5 g of ethyl chloroformate was added dropwise at 0 to 10°C for 15 minutes. The mixture was stirred for 15 minutes.

[0232] In 150ml of nitrobenzene, dissolve 2,6-dimethylphenol. The solution was kept at 0 to 10°C, and it was added dropwise to the mixture prepared above for 30 minutes. The mixture was stirred at 0 to 10°C for 2 hours and at room temperature for 1 hour.

[0233] With 2 liters of ice-cold water, mix 60 ml of concentrated hydrochloric acid. The reaction mixture prepared above was poured quietly into diluted hydrochloric acid. The mixture was extracted with 500 ml of ethyl acetate. Dry over sodium sulfate and concentrate the organic phase. The nitrobenzene was removed under reduced pressure to give a solid. The resulting solid was reslurrie...

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Abstract

A lithographic printing process comprises the steps of: imagewise exposing to infrared light a presensitized lithographic plate which comprises a hydrophilic support and an image-forming layer containing an infrared absorbing agent, a polymerization initiator and a binder polymer to polymerize the polymerizable compound within the exposed area; removing the image-forming layer within the unexposed area while mounting the lithographic plate on a cylinder of a printing press; and then printing with the lithographic plate while mounting the lithographic plate on the cylinder of the printing press. The polymerization initiator is a salt of an anion with a sulfonium ion. According to the present invention, a specific anion or a specific sulfonium ion is used in the polymerization initiator.

Description

technical field [0001] The present invention relates to a lithographic process involving on-press development. The present invention also relates to a presensitized lithographic printing plate comprising a hydrophilic support and an image-forming layer comprising an infrared absorber, a polymerization initiator, a polymerizable compound, and a binder polymer. Background technique [0002] Lithographic printing plates typically contain hydrophobic image areas that accept oil-based inks during printing, and hydrophilic non-image areas that accept dampening water. The conventional lithographic printing method generally comprises the steps of: masking a pre-sensitized (PS) plate comprising a hydrophilic carrier and a hydrophobic photosensitive resin layer with a lithographic film, exposing the printing plate through the lithographic film, and then developing the printing plate, To remove non-image areas with a developing solution. [0003] Now, computer electronics process, st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41C1/055G03F7/00
Inventor 大岛康仁因埜纪文光本知由藤牧一广嵨田和人牧野直宪
Owner FUJIFILM CORP
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