Developer Composition for Flexographic Printing Plates
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Solution Overview
Problem
Existing aqueous developers for water-developable photosensitive flexographic printing plates face challenges in achieving high development speed, especially with thin brushes, while maintaining high dispersibility of un-photocrosslinked resin and pattern mask layers, and ensuring fine pattern reproducibility.
Innovation Solution
A developer composition containing a specific nonionic surfactant and a specific anionic surfactant in a specific mass ratio, which enables high development speed and high dispersibility of the pattern mask layer without degrading the development speed, and ensures high pattern reproducibility and dispersibility of un-photocrosslinked photosensitive resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an aqueous developer is used for water-developable photosensitive resin printing plate, then environmental impact is reduced and workability is improved, but development speed is insufficient especially with thin brushes
Solution Approach 1:
The patent modifies the chemical composition parameters of the aqueous developer by incorporating specific surfactants (nonionic and/or anionic) and organic bases to optimize both workability and development speed. The formulation adjusts concentrations and types of chemicals to enhance developer performance without compromising environmental benefits
Solution Approach 2:
The patent creates a composite aqueous developer system combining multiple components including surfactants, organic bases, and water-soluble carriers. This composite formulation synergistically improves development speed while maintaining the environmental advantages of aqueous-based systems
2Productivity
If repetitive development is performed in the same aqueous developer, then production efficiency is improved, but developability degrades due to adhesion of un-photocrosslinked resin and pattern mask layer on brush
Solution Approach 1:
The patent implements a feedback mechanism where the developer composition is designed to maintain its developing capability over multiple uses. The surfactant and organic base components continuously act to prevent resin adhesion, ensuring consistent performance throughout the development process and enabling reliable repetitive use
Solution Approach 2:
The patent ensures continuous effective action of the developer by incorporating surfactants and organic bases that prevent resin adhesion throughout the entire development process. This continuous protective action maintains developability across multiple development cycles, enabling sustained production efficiency
3Stability of the object's composition
If scum disperses in the aqueous developer during repetitive development, then dispersibility is improved, but plate quality degrades due to re-adhesion of scum on printing plate surface
Solution Approach 1:
The patent introduces surfactants as intermediary substances that mediate between the scum (dispersed resin and pattern mask layer) and the aqueous developer. These surfactants maintain scum dispersion through continuous adsorption and stabilization, preventing re-adhesion to the printing plate surface while preserving plate quality
Solution Approach 2:
The patent converts the potentially harmful effect of scum formation into a beneficial outcome by using surfactants and organic bases to stabilize the dispersed scum particles. The scum that would normally re-adhere and degrade plate quality is instead maintained as a stable dispersion, preventing quality issues while allowing repetitive development
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 developer composition achieves high development speed even with thin brushes, enhances dispersibility of un-photocrosslinked resin and pattern mask layers, and ensures high pattern reproducibility, thereby improving productivity and quality of the printing plates.
Implementation Method 1
A developer composition containing a specific nonionic surfactant and a specific anionic surfactant in a specific mass ratio
Implementation Method 2
enhances dispersibility of un-photocrosslinked resin and pattern mask layers
Implementation Method 3
The pattern mask layer, and the un-photocrosslinked photosensitive resin composition in the photosensitive resin layer will be dissolved or dispersed in the developer
Data Source
Figure 1~2
AI summary
The present invention aims to provide a developer composition capable of satisfying high development speed even with a thin brush, and satisfying high levels of pattern reproducibility, diespersibility of the un-photocrosslinked resin composition in the photosensitive resin layer, and dispersibility of the pattern mask layer, all of which have been issues from the past. According to the present invention, there is provided a developer composition for a water-developable photosensitive flexographic printing original plate, containing (a) a nonionic surfactant composed of monoalkyl ether and/or monoalkyl ester of polyethylene glycol, wherein a number of carbon atoms of the alkyl group therein is 8 to 19, and wherein an HLB value thereof is 11 to 16; and (b) one or more anionic surfactants selected from the group consisting of oleic acid metal salt, lauric acid metal salt, dodecylbenzene sulfonic acid metal salt and lauryl sulfate metal salt, wherein a content ratio of (a) : (b) is 25 : 75 to 75 : 25 (mass ratio), and wherein a brushing friction coefficient on a surface of a printing original plate is 0.60 to 0.75[-], when measured in an aqueous developer containing 1% by mass of the developer composition and 99% by mass of water.