IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0899123
(2001-07-06)
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우선권정보 |
JP-0224031 (2000-07-25) |
발명자
/ 주소 |
- Nakamura, Ippei
- Sorori, Tadahiro
|
출원인 / 주소 |
- Fuji Photo Film Co., Ltd.
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대리인 / 주소 |
Burns, Doane, Swecker & Mathis, LLP
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인용정보 |
피인용 횟수 :
2 인용 특허 :
22 |
초록
▼
A negative image-recording material which can be imagewise-exposed by IR radiation from IR lasers and enables direct image formation from digital data of a computer or the like. The material, when used in a lithographic printing plate, ensures good hardenability in an image area, exhibits good print
A negative image-recording material which can be imagewise-exposed by IR radiation from IR lasers and enables direct image formation from digital data of a computer or the like. The material, when used in a lithographic printing plate, ensures good hardenability in an image area, exhibits good printing durability, even if not heated for image-formation, and ensures a large number of good prints from the printing plate. The material includes (A) an IR absorber having an oxidation potential of at most 0.35 V (vs. SCE), (B) a thermal radical generator and (C) a radical-polymerizing compound. The material is imagewise-exposed to IR radiation for image formation. Preferably, the IR absorber (A) has, in a chromophoric group, an electron-donating substituent having a Hammett's σpara value of at most −0.10, and the thermal radical generator (B) is an onium salt.
대표청구항
▼
1. A negative image-recording material for heat-mode exposure, the material comprising: (A) an IR absorber having an oxidation potential of at most 0.45 V (vs. SCE); (B) a thermal radical generator; and (C) a radical-polymerizing compound, the material being recordable by exposure with IR radiation.
1. A negative image-recording material for heat-mode exposure, the material comprising: (A) an IR absorber having an oxidation potential of at most 0.45 V (vs. SCE); (B) a thermal radical generator; and (C) a radical-polymerizing compound, the material being recordable by exposure with IR radiation. 2. The negative image-recording material as claimed in claim 1, wherein the oxidation potential of the IR absorber is from 0.10 to 0.40 V (vs. SCE). 3. The negative image-recording material as claimed in claim 2, wherein the IR absorber has, in a chromophoric group thereof, an electron-donating substituent having a Hammett's σpara value of at most −0.10. 4. The negative image-recording material as claimed in claim 3, wherein the electron-donating substituent is selected from the group consisting of a methyl group, an ethyl group, a propyl group, a hydroxyl group, a methoxy group, an ethoxy group, a propyloxy group, a butoxy group, a phenoxy group, a toluyloxy group, an amino group, a methylamino group, an ethylamino group, a butylamino group, a dimethylamino group, a diethylamino group, a phenylamino group, and a diphenylamino group. 5. The negative image-recording material as claimed in claim 2, wherein (B) the thermal radical generator is an onium salt. 6. The negative image-recording material as claimed in claim 5, wherein the onium salt has an absorption peak at a wavelength of at most 360 nm. 7. The negative image-recording material as claimed in claim 5, wherein (C) the radical-polymerizing compound has at least one ethylenically unsaturated double bond. 8. The negative image-recording material as claimed in claim 2, wherein (C) the radical-polymerizing compound has at least one ethylenically unsaturated double bond. 9. The negative image-recording material as claimed in claim 1, wherein the oxidation potential of the IR absorber is from 0.10 to 0.35 V (vs. SCE). 10. The negative image-recording material as claimed in claim 1, wherein the IR absorber has, in a chromophoric group thereof, an electron-donating substituent having a Hammett's σpara value of at most −0.10. 11. The negative image-recording material as claimed in claim 10, wherein the electron-donating substituent is selected from the group consisting of a methyl group, an ethyl group, a propyl group, a hydroxyl group, a methoxy group, an ethoxy group, a propyloxy group, a butoxy group, a phenoxy group, a toluyloxy group, an amino group, a methylamino group, an ethylamino group, a butylamino group, a dimethylamino group, a diethylamino group, a phenylamino group, and a diphenylamino group. 12. The negative image-recording material as claimed in claim 1, wherein (B) the thermal radical generator is an onium salt. 13. The negative image-recording material as claimed in claim 8, wherein the onium salt has an absorption peak at a wavelength of at most 400 nm. 14. The negative image-recording material as claimed in claim 1, wherein (C) the radical-polymerizing compound has at least one ethylenically unsaturated double bond. 15. The negative image-recording material as claimed in claim 1, the IR absorber is a dye represented by the following general formula (D1),wherein, R 1 and R 2 each independently represents a hydrogen atom or a hydrocarbon group having from 1 to 12 carbon atoms; and R 1 and R 2 may be bonded to each other to form a ring structure; Ar 1 and Ar 2 may be the same or different, and each represents an optionally-substituted aromatic hydrocarbon group; Y 1 and Y 2 may be the same or different, and each represents a sulfur atom or a dialkylmethylene group having at most 12 carbon atoms; R 3 and R 4 may be the same or different, and each represents an optionally-substituted hydrocarbon group having at most 20 carbon atoms; R 5 , R 6 , R 7 and R 8 may be the same or different, and each represents a hydrogen atom or a hydrocarbon group having at most 12 carbon atoms; R 9 and R 10 may be the same or different, and each represents an optionally-substituted aromatic hydrocarbon group having from 6 to 10 carbon atoms, an alkyl group having from 1 to 8 carbon atoms, or a hydrogen atom; and R 9 and R 10 may be bonded to each other to form any of the following cyclic structures,and X represents a counter anion. 16. The negative image-recording material as claimed in claim 1, the IR absorber is a dye represented by the following general formula (D2),wherein, R 1 and R 2 each independently represents a hydrogen atom or a hydrocarbon group having from 1 to 12 carbon atoms; and R 1 and R 2 may be bonded to each other to form a ring structure; Ar 1 and Ar 2 may be the same or different, and each represents an optionally-substituted aromatic hydrocarbon group; Y 1 and Y 2 may be the same or different, and each represents a sulfur atom or a dialkylmethylene group having at most 12 carbon atoms; R 3 and R 4 may be the same or different, and each represents an optionally-substituted hydrocarbon group having at most 20 carbon atoms; R 5 , R 6 , R 7 and R 8 may be the same or different, and each represents a hydrogen atom or a hydrocarbon group having at most 12 carbon atoms; Ar 3 represents a mono- or poly-heterocyclic group having at least one atom of nitrogen, oxygen or sulfur; and X − represents a counter anion. 17. The negative image-recording material as claimed in claim 1, the IR absorber is a dye represented by the following general formula (D3),wherein R 1 and R 2 each independently represents a hydrogen atom or a hydrocarbon group having from 1 to 12 carbon atoms; and R 1 and R 2 may be bonded to each other to form a ring structure; Ar 1 and Ar 2 may be the same or different, and each represents an optionally-substituted aromatic hydrocarbon group; Y 1 and Y 2 may be the same or different, and each represents a sulfur atom or a dialkylmethylene group having at most 12 carbon atoms; R 3 and R 4 may be the same or different, and each represents an optionally-substituted hydrocarbon group having at most 20 carbon atoms; R 5 , R 6 , R 7 and R 8 may be the same or different, and each represents a hydrogen atom or a hydrocarbon group having at most 12 carbon atoms; R 11 and R 12 may be the same or different, and each represents a hydrogen atom, an allyl group, a cyclohexyl group, or an alkyl group having from 1 to 8 carbon atoms; Z represents an oxygen or sulfur atom. 18. The negative image-recording material as claimed in claim 1, the IR absorber is a betaine-type dye which does not have a positive charge. 19. A method of image formation comprising the steps of:providing a lithographic printing plate having, on a support, a recording layer formed of a negative image-recording material for heat-mode exposure, the material comprising (A) an IR absorber having an oxidation potential of at most 0.45 V (vs. SCE), (B) a thermal radical generator and (C) a radical-polymerizing compound;imagewise-exposing the lithographic printing plate with IR radiation; anddeveloping the lithographic printing plate with an aqueous alkaline liquid having a pH of from 10.5 to 12.5. 20. The method of image formation as claimed in claim 19, wherein the oxidation potential of the IR absorber (A) is from 0.10 to 0.40 V (vs. SCE). 21. The method of image formation as claimed in claim 20, wherein (A) the IR absorber has, in a chromophoric group thereof, an electron-donating substituent having a Hammett's σpara value of at most −0.10. 22. The method of image formation as claimed in claim 19, wherein (A) the IR absorber has, in a chromophoric group thereof, an electron-donating substituent having a Hammett's σpara value of at most −0.10. 23. The method of image formation as claimed in claim 19, wherein (B) the thermal radical generator is an onium salt. 24. The method of image formation as claimed in claim 19, wherein (C) the radical-polymerizing compound has at least one ethylenically unsaturated double bond.
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