Lithographic Printing Plate Developer Formulation
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Solution Overview
Problem
Current methods for producing lithographic printing plates face challenges with scratch stain resistance and environmental concerns due to alkaline developers, which lead to inefficient waste management and insufficient dispersion stability of development scum in acidic to weak alkaline ranges.
Innovation Solution
A method involving a developer with a compound having phosphate, phosphonate, or phosphinate groups, along with anionic and nonionic surfactants, is used to remove the non-exposed image-recording layer, maintaining a pH of 5 to 10, without a water washing step, enhancing scratch stain resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alkaline developers are used to remove the non-exposed image-recording layer, then the development process is effective, but the dispersion stability of development scum deteriorates and environmental impact increases
Solution Approach 1:
The patent changes the pH parameter of the developer from strongly alkaline (pH 12 or higher) to weakly alkaline or neutral (pH 7-10), and modifies the chemical composition by incorporating specific surfactants and chelating agents. This parameter change maintains development effectiveness while improving development scum dispersion stability and reducing environmental impact.
Solution Approach 2:
The patent uses a composite developer system containing multiple components: weak base agents (e.g., ammonia, amine compounds), anionic surfactants, nonionic surfactants, and chelating agents. This composite formulation achieves both effective development and stable development scum dispersion without requiring strongly alkaline conditions.
2Reliability
If alkaline developers are used for development, then the image-recording layer is effectively removed, but harmful factors increase due to waste liquid disposal issues
Solution Approach 1:
The patent reduces the alkalinity parameter of the developer from pH 12 or higher to pH 7-10, which significantly decreases the environmental harm of waste liquid while maintaining effective removal of the non-exposed image-recording layer.
Solution Approach 2:
The patent converts the harmful strongly alkaline developer into a beneficial weakly alkaline or neutral developer by incorporating environmentally friendly surfactants and chelating agents, turning an environmental problem into a sustainable solution that maintains development effectiveness.
3Reliability
If a water washing step is included after development, then residual developer is removed, but process complexity and water consumption increase
Solution Approach 1:
The patent extracts the water washing step from the development process by formulating a developer that does not require subsequent washing. The developer composition is designed to be self-rinsing, allowing direct progression to drying and printing without additional water consumption or process complexity.
Solution Approach 2:
The patent merges the development function with the rinsing function into a single step by using a developer formulation that eliminates the need for separate water washing, thereby simplifying the overall process while maintaining plate cleanliness.
4Productivity
If strongly alkaline developers are used, then development speed is high, but scratch stain resistance deteriorates
Solution Approach 1:
The patent employs a composite developer system containing weak base agents combined with specific anionic and nonionic surfactants. This composite formulation maintains adequate development speed while providing excellent scratch stain resistance through the synergistic action of multiple components that protect the plate surface during development.
Solution Approach 2:
The patent adjusts the pH parameter from strongly alkaline to weakly alkaline or neutral range, which reduces plate surface damage and improves scratch stain resistance while maintaining sufficient development speed through optimized surfactant concentrations and types.
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 method produces lithographic printing plates with improved scratch stain resistance and reduced environmental impact by stabilizing development scum dispersion and minimizing waste, while eliminating the need for alkaline developers.
Implementation Method 1
a step of removing a non-exposed portion of the image-recording layer exposed in the lithographic printing plate precursor using a developer
Implementation Method 2
the developer includes a compound having at least one acidic group selected from the group consisting of a phosphate group, a phosphonate group, and a phosphinate group and one or more carboxy groups, an anionic surfactant and a nonionic surfactant
Data Source
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AI summary
A method for producing a lithographic printing plate includes, in this order, a step of preparing a lithographic printing plate precursor having an image-recording layer on a hydrophilic support, a step of exposing the lithographic printing plate precursor in an image shape, and a step of removing a non-exposed portion of the image-recording layer exposed in the lithographic printing plate precursor using a developer, the developer includes a compound having at least one acidic group selected from the group consisting of a phosphate group, a phosphonate group, and a phosphinate group and one or more carboxy groups, a pH of the developer is 5 to 10, and, after the removal step, a step of washing a surface of an obtained lithographic printing plate with water and a step of desensitizing the surface of the obtained lithographic printing plate are not provided.