Silver halide emulsion with high image contrast, and preparing method and use thereof

A silver halide and emulsion technology, which is applied in the field of printing plate making, can solve the problem of inability to improve the r value of CTP plates, and achieve the effects of high image contrast, improved image contrast, and high image density.

Inactive Publication Date: 2004-06-30
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the silver salt diffusion transfer method, it is impossible to increase the r value of the CTP plate through enhanced development. How to improve the image contrast or image gamma coefficient of the CTP plate prepared by the silver salt diffusion transfer method is the common pursuit of everyone. The problem

Method used

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  • Silver halide emulsion with high image contrast, and preparing method and use thereof
  • Silver halide emulsion with high image contrast, and preparing method and use thereof

Examples

Experimental program
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Effect test

Embodiment 2

[0068] Adopt the method of comparative example 1, difference is in the emulsification process of step (1), add 1.5 * 10 by every mole silver halide -6 moles of IrCl 4 , other preparation conditions and steps are the same as in Comparative Example 1 to prepare the silver chlorobromide emulsion of the present embodiment, and the emulsion properties are shown in Table 3.

[0069] Using the silver chlorobromide emulsion prepared in this example, a CTP plate and an offset printing plate were prepared and printed according to the method of Comparative Example 1. The printing results are shown in Table 4.

Embodiment 3

[0071] Adopt the method for embodiment 2, difference is: replace 1.9mol / l NaCl solution and 0.1mol / l NaBr solution with 1.95mol / lNaCl solution and 0.05mol / l NaI solution; In step (1) emulsification process, press Add 1.25×10 per mole of silver halide -6 moles of RhCl 3 , without adding 1.5×10 -6 moles of IrCl 4 , other preparation conditions and steps are the same as in Example 2 to prepare the silver chloroiodide emulsion of the present embodiment, and the emulsion properties are shown in Table 3.

[0072] Using the silver chloroiodide emulsion prepared in this example, a CTP plate and an offset printing plate were prepared and printed according to the method in Example 2. The printing results are shown in Table 4.

Embodiment 4

[0074] The method of Comparative Example 1 is adopted, and the difference is that before adding the triazindoleizine stabilizer in the step (2) chemical ripening process, add 1.5 × 10 per mole of silver halide -6 moles of IrCl 4 , other preparation conditions and steps are the same as in Comparative Example 1 to prepare the silver chlorobromide emulsion of the present embodiment, and the emulsion properties are shown in Table 3.

[0075] Using the silver chlorobromide emulsion prepared in this example, a CTP plate and an offset printing plate were prepared and printed according to the method of Comparative Example 1. The printing results are shown in Table 4.

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Abstract

The invention belongs to printing plate-making field, especially refers to high image contrast silver halide emulsion and the manufacturing method in silver salt diffusion abevacuation plate-making system, and the application in the high image contrast CTP plate and CTP offset printing plate. The emulsion includes chlorobromide and chloride silver iodide, aurothio chemical induction enhancing agent, triaindole pyrazine stabilizer, colorant light spectrum induction enhancing agent, celluloid and water, the emulsion also includes iridium salt, rhodium salt or the compound of them with any ratio.

Description

technical field [0001] The invention belongs to the field of printing plate making, and particularly relates to a silver halide emulsion with high image contrast and a preparation method thereof in a silver salt diffusion transfer method plate making system, and the silver halide emulsion with high image contrast in the preparation of high contrast CTP plates and CTP offset printing version of the application. Background technique [0002] Applying the principle of silver salt diffusion transfer reversal (DTR) to prepare computer-to-plate materials (Computer To Plate, abbreviated as CTP) and CTP offset printing plates in U.S. Pat. No. 4,160,670, U.S. Pat. No. 5,427,889 and EP-A -945,756 of them have been published. [0003] At present, DTR-image is used as a CTP offset printing plate, and the aluminum base plate is generally used as a support, and then a layer of nano-sized physical development core is coated on the support, and after drying, a layer of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03C8/28G03F7/07G03F7/09G03F7/32
Inventor 陈萍段培成盛丽琴郑德水
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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