Lithographic Printing Plate Precursor Gas Generation for Chemical-Free Development
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Solution Overview
Problem
Current methods for achieving high-resolution lithographic printing plates using chemical-free developing techniques are inadequate, as they fail to provide sufficient sensitivity and solvent resistance, with previous approaches either underperforming in resolution or compromising solvent resistance.
Innovation Solution
A lithographic printing plate precursor comprising a substrate, a heat-sensitive layer, and an ink repellent layer, where the heat-sensitive layer includes a polymer, a near-infrared absorbing compound, and an easily heat-decomposable compound, optimized for gas generation and adhesion properties, allowing for high-resolution imaging without chemical solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If air bubbles are incorporated in the heat-sensitive layer to decrease thermal conductivity and suppress heat diffusion, then sensitivity to laser beams is improved, but adhesion between the heat-sensitive layer and silicone layer deteriorates
Solution Approach 1:
The patent changes the physical and chemical parameters of the heat-sensitive layer by incorporating specific compounds (azo compounds, hydrazine compounds, or their mixtures) that decompose at controlled temperatures. This allows precise control over the decomposition temperature to balance thermal conductivity reduction with adhesion maintenance, resolving the contradiction between sensitivity improvement and adhesion deterioration.
Solution Approach 2:
The patent creates a composite heat-sensitive layer containing multiple components: polymer matrix, azo compounds, hydrazine compounds, and their mixtures. This composite structure enables simultaneous achievement of low thermal conductivity (for sensitivity) and controlled adhesion properties through the synergistic interaction of different materials with specific decomposition characteristics.
2Measurement precision
If metal-containing organic substances are incorporated to generate decomposition gas and decrease adhesion, then sensitivity is improved, but solvent resistance deteriorates
Solution Approach 1:
The patent carefully controls the decomposition temperature parameter of the heat-sensitive layer by selecting specific azo and hydrazine compounds with defined thermal stability ranges. This parameter control ensures that decomposition occurs at temperatures that generate sufficient gas for sensitivity improvement while maintaining solvent resistance by preventing premature decomposition that would compromise layer integrity.
Solution Approach 2:
The patent applies local quality by creating zones with different decomposition characteristics within the heat-sensitive layer. The azo and hydrazine compounds are distributed to provide localized gas generation at specific depths or regions, enabling sensitivity improvement in the laser-irradiated portion while maintaining overall solvent resistance through controlled spatial distribution of functional materials.
3Manufacturing precision
If heat-sensitive layer composition is optimized for gas generation to improve sensitivity, then resolution is improved, but structural integrity deteriorates
Solution Approach 1:
The patent employs a composite material system consisting of polymer matrices combined with azo compounds, hydrazine compounds, and their mixtures. This composite structure provides both the gas generation capability needed for high resolution and the structural stability required for maintaining integrity, as each component contributes specific properties that complement the others.
Solution Approach 2:
The patent incorporates azo and hydrazine compounds that serve as preemptive cushioning agents. These compounds are designed to decompose at controlled temperatures before the main imaging process, generating gas that prevents excessive adhesion and maintains structural integrity during subsequent processing steps, thereby cushioning against potential structural failures.
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 solution enables high-resolution imaging with improved solvent and peeling resistance, achieving effective chemical-free development while maintaining structural integrity and print quality.
Implementation Method 1
light exposure of waterless lithographic printing plates is performed mainly by the laser-induced photothermal conversion technique that causes a thermal reaction to break the heat-sensitive layer
Implementation Method 2
the incorporation of a metal-containing organic substance serving as a heat-decomposable compound in the heat-sensitive layer of a direct imageable waterless printing plate precursor so that decomposition gas is generated in the laser irradiated portion
Data Source
AI summary
The present invention provides a lithographic printing plate precursor including at least a heat-sensitive layer and an ink repellent layer disposed on a substrate, the rate of gas generation therefrom being 6.5 x 105 g/m3 to 12.5 x 105 g/m3 as determined by GC-MS analysis in which the lithographic printing plate precursor is heated in a nitrogen stream at 450°C for 5 minutes, and also provides a method for producing a lithographic printing plate and a method for producing printed matter therefrom.