On-Press Lithographic Plate Precursors with Infrared Decomposition
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Solution Overview
Problem
Existing lithographic printing technologies generate significant waste liquids during development treatments, necessitating a shift towards on-press development methods that improve printing durability and reduce environmental impact.
Innovation Solution
A lithographic printing plate precursor with an image-recording layer containing a specific compound represented by Formula (1), which undergoes decomposition upon exposure to heat or infrared, forming a visible color and enabling on-press development, enhancing printing durability and developability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional development treatment is performed, then the lithographic printing plate can be prepared, but significant waste liquids are generated causing environmental issues
Solution Approach 1:
The patent extracts and eliminates the separate development treatment step from the conventional plate preparation process. By incorporating on-press development capability directly into the printing plate precursor through the use of decomposition-type infrared absorbers and specific resin compositions, the harmful development liquids are completely removed from the process, achieving zero waste liquid generation while maintaining plate preparation functionality
Solution Approach 2:
The printing plate precursor is designed to perform its own development function during the printing process itself. The decomposition-type infrared absorber enables the plate to automatically differentiate between image and non-image areas through infrared exposure and decomposition reactions during printing, eliminating the need for external development chemicals and equipment
2Object-generated harmful factors
If on-press development method is used to reduce waste, then environmental impact is minimized, but printing durability may be compromised
Solution Approach 1:
The patent carefully controls the decomposition characteristics of the infrared absorber by selecting specific compounds with appropriate decomposition temperatures and rates. The resin composition parameters are also optimized to ensure that the plate maintains its structural integrity and printing durability while enabling sufficient decomposition for on-press development. This parameter optimization resolves the contradiction between environmental friendliness and printing reliability
Solution Approach 2:
The patent uses composite resin compositions that combine multiple materials with complementary properties. The resin system includes components that provide both the necessary decomposition behavior for on-press development and the structural strength required for printing durability. This composite approach allows simultaneous achievement of environmental benefits and mechanical reliability
3Device complexity
If decomposition-type infrared absorber is used for on-press development, then wet treatment is eliminated, but the compound structure must be precisely controlled
Solution Approach 1:
The patent applies local quality control by specifying particular structural features at different positions within the infrared absorber molecule. The general formula (1) allows for specific substituent patterns and structural variations at different locations (R1, R2, R3, Ar1, Ar2, etc.), enabling precise control over decomposition behavior while maintaining the overall simplicity of the on-press development process
Solution Approach 2:
The patent manages manufacturing precision by establishing specific parameter ranges for the compound structure, such as molecular weight ranges, substituent types, and compositional ratios. These controlled parameters ensure consistent decomposition characteristics and on-press development performance without requiring overly complex manufacturing processes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The precursor achieves excellent printing durability, color formability, and on-press developability, reducing the need for wet treatments and minimizing waste generation.
Implementation Method 1
the image-recording layer contains a compound represented by Formula (1)... which undergoes decomposition upon exposure to heat or infrared
Implementation Method 2
undergoes decomposition upon exposure to heat or infrared, forming a visible color
Implementation Method 3
undergoes decomposition upon exposure to heat or infrared
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Provided is an on-press development type lithographic printing plate precursor having excellent printing durability. An on-press development type lithographic printing plate precursor includes: a support; and an image-recording layer on the support, in which the image-recording layer contains a compound represented by Formula (1), a method of preparing a lithographic printing plate using the on-press development type lithographic printing plate precursor, a lithographic printing method, and a novel compound. In the formula, R1 represents a group represented by Formula (2) or Formula (3), R10 represents a monovalent organic group having an aryl group, R11 to R14 and R17 to R20 each independently represent a hydrogen atom, an alkyl group, or an aryl group, R15 and R16 each independently represent a hydrogen atom, an alkyl group, or an aryl group, and at least two of R11 to R20 may be bonded to each other to form a ring structure.