Photosensitive Resin Composition for Flexographic Printing Plates
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Solution Overview
Problem
Conventional water-developable photosensitive resin compositions for flexographic printing plates either lack printing durability or fine image reproducibility, failing to simultaneously achieve both mechanical strength and high image resolution.
Innovation Solution
A photosensitive resin composition comprising hydrophobic polymers from at least two kinds of water-dispersible latexes, a rubber, a photopolymerizable compound, and a photopolymerization initiator, with specific ratios and optional aggregation inhibitors, forming a layer with partially saponified polyvinyl acetate or a water-soluble cellulose derivative on the surface, and optionally an infrared ablation layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a water-developable photosensitive resin composition containing at least two kinds of water-dispersible latexes and hydrophilic polymer is used, then fine image reproducibility is improved, but mechanical strength and printing durability become insufficient
Solution Approach 1:
The patent uses a composite material system comprising water-dispersible latex, rubber, and hydrophilic polymer in specific weight ratios (latex: 50-90 parts, rubber: 1-7 parts relative to total latex+ rubber, hydrophilic polymer: 10-50 parts). This composite composition achieves both fine image reproducibility through the latex component and sufficient mechanical strength through the synergistic combination with rubber and controlled hydrophilic polymer content, resolving the contradiction between image quality and mechanical durability
2Strength
If a photosensitive resin composition containing water-dispersible latex and rubber is used, then mechanical strength is improved, but fine image reproducibility becomes inferior
Solution Approach 1:
The patent precisely controls the weight ratio parameters of rubber to total latex and rubber within 1 to 7%, and hydrophilic polymer content within 10-50 parts relative to latex. By optimizing these compositional parameters, the invention achieves the optimal balance where rubber provides mechanical strength while the dominant latex component (50-90 parts) ensures fine image reproducibility, preventing the degradation of image quality that occurs with higher rubber content
3Reliability
If hydrophobic polymers from water-dispersible latexes and rubber are used in appropriate ratios, then both printing durability and fine image reproducibility can be highly maintained
Solution Approach 1:
The patent defines specific parameter ranges for achieving optimal performance: water-dispersible latex 50-90 parts, rubber 1-7 parts relative to total latex and rubber, and hydrophilic polymer 10-50 parts. These controlled compositional parameters ensure both printing durability through sufficient rubber content and fine image reproducibility through dominant latex content, while the specified ranges prevent composition complexity from becoming unmanageable
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 composition enables a flexographic printing plate with excellent printing durability and fine image reproducibility, specifically achieving 175 lpi resolution, while maintaining mechanical strength and elongation.
Implementation Method 1
a photopolymerizable compound and a photopolymerization initiator
Data Source
AI summary
The present invention provides a water-developable photosensitive resin composition for flexographic printing original plate which highly satisfies both printing durability and fine image reproducibility for 175 lpi. A photosensitive resin composition for a flexographic printing original plate, characterized in that, the composition contains (A) hydrophobic polymers obtained from at least two kinds of water-dispersible latexes, (B) a rubber, (C) a photopolymerizable compound, (D) a photopolymerization initiator, and optionally (E) an aggregation inhibitor and that the ratio by mass of the component (B) to the total mass of the component (A) and the component (B) is within a range of from 1 to 7%. It is preferred that hydrophobic polymer (s) obtained from at least one kind of water-dispersible latex(es) in the above component (A) and the rubber of the component (B) have a common skeleton structure.