CTcP Lithographic Plate Chemical-Resistant Layer
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Solution Overview
Problem
Conventional positive-image PS plates and CTcP plates face challenges with poor chemical resistance, low pressrun, and intolerance to UV ink, requiring high-temperature baking and lacking precision, while also struggling to meet the sensitivity and resolution demands of modern printing technologies.
Innovation Solution
A printing plate material with a hydrophilic layer, a bottom layer consisting of a chemical-resistant functional resin, and a top layer with a photoacid generator, optimized for visible light and UV sensitivity, where the exposed regions are alkali-soluble and non-exposed regions are insoluble, using specific copolymers, photoactive compounds, and development accelerators to enhance sensitivity, resolution, and solvent resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional positive-image PS plate uses traditional photosensitive composition, then the plate can be manufactured with standard process, but the chemical resistance is poor and pressrun is low
Solution Approach 1:
The patent uses a composite photosensitive layer structure with multiple functional components: a phenolic resin-based film-forming resin, a diazo naphthoquinone sulfonate photosensitive compound, and a chemical growth accelerator. This composite material system provides both improved chemical resistance and UV ink tolerance while maintaining compatibility with existing manufacturing processes.
Solution Approach 2:
The patent modifies the chemical composition parameters of the photosensitive layer by incorporating specific ratios of phenolic resin, controlling the molecular weight and structure of the film-forming resin, and adjusting the concentration of chemical growth accelerators. These parameter changes enhance chemical resistance without requiring fundamental process changes.
2Adaptability or versatility
If conventional PS plate is used for UV ink printing, then the plate structure remains simple, but the plate shows intolerance to UV ink
Solution Approach 1:
The patent converts the potential harmful effect of UV ink on conventional plates into a beneficial feature by incorporating UV-absorbing components and chemical growth accelerators that specifically enhance resistance to UV ink. The diazo photosensitive compound and phenolic resin combination creates a cross-linked structure that is tolerant to UV ink while maintaining other desired properties.
3Reliability
If high-temperature baking is applied to improve chemical resistance, then the chemical resistance increases, but the process becomes complex and precision decreases
Solution Approach 1:
The patent replaces the mechanical/thermal process of high-temperature baking with a chemical solution approach. By incorporating chemical growth accelerators and optimizing the phenolic resin composition, the desired chemical resistance is achieved through chemical cross-linking and molecular structure design rather than thermal processing, thereby maintaining manufacturing precision.
4Measurement precision
If traditional photosensitive composition is used, then the manufacturing process is simple, but the sensitivity and resolution do not meet modern printing requirements
Solution Approach 1:
The patent applies local quality by creating a photosensitive layer with spatially differentiated functions: the phenolic resin provides base structure and chemical resistance, the diazo naphthoquinone sulfonate provides photosensitivity, and the chemical growth accelerator provides enhanced development control. Each component is optimized for its specific function while working together to achieve high resolution and sensitivity.
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 improves chemical resistance, sensitivity, resolution, and pressrun, making the plates suitable for UV ink printing while reducing VOC emissions and improving precision.
Implementation Method 1
The light source is a laser beam or a printing lamp. The printing plate material is exposed to the light source to form a latent image.
Implementation Method 2
The diazo photosensitive compound naphthoquinone sulfonate of the plate photosensitive layer was sensitive to ultraviolet light, which encountered diazo decomposition while meeting UV irradiation. The o-quinone azide is translated into the indanone and then is translated into the indan-acid.
Implementation Method 3
for the unexposed portions, the intermolecular association between the o-quinone azide and the phenolic hydroxyl group of the film-forming phenolic hydroxyl resin occurrs to form a stable six-ring structure, so as to increase the alkali-insoluble of the coating
Data Source
AI summary
A printing plate material for Positive-image PS plate and CTcP lithographic plate, which includes a hydrophilic supporting body, a bottom layer and a top layer. The bottom layer and the top layer are covered to the hydrophilic supporting body. The bottom layer and the top layer are capable of being dissolved by alkali after being exposed. Photosensitive composition of the bottom layer includes chemical resistant functional resin, photosensitive compound and background coloring dye. Branch chain carbon atom of the chemical resistant function resin is provided with benzylsulfonyl amino and N-aromatic maleimide circulating units. The molecular weight of the chemical resistant functional resin is between 1000 and 100000. Photosensitive composition of the top layer consists of film-forming resin, photosensitive compound, and photoacid generator and background coloring dye. The bottom layer and the top layer are sensitive to visible light and ultraviolet light. After being exposed to visible light and/or ultraviolet light, the bottom layer and the top layer are developed in alkaline solution. An exposure area is eliminated after being dissolved. The non-exposure area is insoluble or is retained after subjecting to slight corrosion. The printing plate material for positive-image PS plate and CTcP lithographic plate according to the present invention has excellent solvent resistance, high sensitivity, high resolution, good developing tolerance level and is applicable to UV ink printing.