Original Plate For On-Press Development Type Lithographic Printing Plate, Method For Fabricating Lithographic Printing Plate, And Lithographic Printing Method
Patent No. EP4349602 (titled "Original Plate For On-Press Development Type Lithographic Printing Plate, Method For Fabricating Lithographic Printing Plate, And Lithographic Printing Method") was filed by Fujifilm on Jun 26, 2020. The application was issued on Nov 12, 2025.
Patent Summary
This negative on-machine development type planographic printing plate precursor comprises a support and an image-recording layer. The layer contains an electron-accepting polymerization initiator, an electron-donating infrared absorber, and a color-developing substance precursor. The precursor is a leuco colorant with a phthalide structure and at least two electron-donating groups (di(unsubstituted alkyl)amino, monoalkyl monoarylamino, or diarylamino groups) directly bonded to an aromatic ring. Technical requirements include: a brightness change $\Delta L \ge 3.0$ upon exposure to an 830 nm infrared laser at 110 $\text{mJ/cm}^2$; a generated color-developing substance with a molar light absorption coefficient $\epsilon \ge 35,000$ and maximum absorption wavelength between 500–650 nm (range 380–750 nm); and a precursor ring-opening rate of 40–99 mol%. Specific examples from EP 3 991 983 A1 and EP 3 991 988 A1 are excluded.
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Date
Description
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EP4349602
- Application Number
- EP24159352A
- Filing Date
- Jun 26, 2020
- Status
- Granted And Under Opposition
- Oct 10, 2025
- Publication Date
- Nov 12, 2025
- External Links
- Slate, Register , Google Patents