Lithographic Printing Plate Precursor Color Formability
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Solution Overview
Problem
Existing lithographic printing plate precursors fail to achieve excellent color formability and suppress streak-like unevenness, particularly when using on-press development methods.
Innovation Solution
An on-press development type lithographic printing plate precursor is developed, comprising a support with an image-recording layer containing an infrared absorber, a polymerization initiator, a polymerizable compound, and specific compounds represented by Formulas (1) and (2), which enhance color formability and reduce streak-like unevenness by improving exposure sensitivity and radical generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional lithographic printing plate precursors are used with on-press development method, then the printing plate can be prepared without separate development treatment, but the color formability is poor and streak-like unevenness occurs
Solution Approach 1:
The patent modifies the chemical parameters of the image-recording layer by incorporating specific compounds (Formula 1 and Formula 2) with particular molecular structures containing electron-donating groups. These parameter changes in chemical composition enable the layer to achieve both on-press developability and excellent color formability, resolving the contradiction between process simplification and quality maintenance.
Solution Approach 2:
The patent creates a composite image-recording layer by combining multiple components: the specific compounds of Formula 1 and Formula 2, polymerizable compounds, photopolymerization initiators, and infrared absorbers. This composite material approach allows the layer to simultaneously exhibit on-press development capability, superior color formability, and resistance to streak-like unevenness.
2Manufacturing precision
If leuco dyes are used to improve color formability, then color visibility is enhanced, but streak-like unevenness cannot be suppressed
Solution Approach 1:
The patent changes the chemical parameters by using specific compounds with defined structures (Formula 1 and Formula 2) that contain electron-donating groups. These parameter changes in molecular structure provide both the color formability needed and the property to suppress streak-like unevenness during on-press development.
Solution Approach 2:
The specific compounds of Formula 1 and Formula 2 act as intermediary substances that mediate between the exposure process and the development process. They enable the image-recording layer to maintain uniformity during on-press development while still achieving excellent color formability in the developed image areas.
3Object-affected harmful factors
If on-press development is implemented to remove development treatment, then environmental impact is reduced, but image quality deteriorates with streak-like unevenness
Solution Approach 1:
The patent converts the potential harm of on-press development (which normally causes streak-like unevenness) into a benefit by using the specific compounds of Formula 1 and Formula 2. These compounds enable the development process to proceed without separate development treatment while actually suppressing streak-like unevenness and maintaining excellent image quality.
Solution Approach 2:
The patent changes the chemical parameters of the image-recording layer to be compatible with on-press development. By incorporating specific compounds with particular structures, the layer achieves environmental friendliness through waste liquid reduction while maintaining superior image quality without streak-like unevenness.
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 the production of lithographic printing plates with excellent color formability and suppressed streak-like unevenness, improving the quality of the printing process.
Implementation Method 1
the image-recording layer contains an infrared absorber
Implementation Method 2
the image-recording layer contains a polymerization initiator, a polymerizable compound
Data Source
AI summary
An on-press development type lithographic printing plate precursor including a support, and an image-recording layer on the support, in which the image-recording layer contains an infrared absorber, a polymerization initiator, a polymerizable compound, and one or more compounds selected from the group consisting of a compound represented by Formula (1) and a compound represented by Formula (2) (in Formula (1) and (2), Ra1 and Ra2 represent an alkyl group, Rb1 and Rb3 represent an alkyl group, Rb2 and Rb4 represent an alkyl group, and EDG's each independently represent a hydrogen atom or an electron-donating group, provided that at least one of the four EDG's in Formula (1) represents an electron-donating group).