Lithographic Plate Precursors with Decomposition-Type IR Absorbers
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Solution Overview
Problem
Existing lithographic printing plate precursors face challenges in achieving excellent printing durability and efficient on-press development, particularly when using decomposition-type infrared absorbers, leading to issues with stability and decomposability.
Innovation Solution
The use of a compound represented by Formula (1) in the image-recording layer of the lithographic printing plate precursor, which includes specific groups that enhance stability and decomposability, allowing for effective on-press development and improved printing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If decomposition-type infrared absorbers are used in the image-recording layer, then on-press development is enabled, but printing durability deteriorates
Solution Approach 1:
The patent modifies the chemical structure of the infrared absorber by introducing specific substituents (Formula (1) with R1-R6 and Za) to change its decomposition characteristics. This structural parameter change allows the infrared absorber to enable on-press development while maintaining printing durability, resolving the contradiction between ease of operation and reliability.
2Stability of the object's composition
If stability of the infrared absorber is increased, then decomposability deteriorates, but on-press development requires both stability and decomposability
Solution Approach 1:
The patent achieves the balance between stability and decomposability by changing the chemical parameters of the infrared absorber structure (Formula (1)). The specific substituents R1-R6 and counterion Za are designed to provide adequate stability for storage and handling while enabling controlled decomposition during on-press development, thus resolving the contradiction between stability and ease of manufacture.
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 compound enhances the lithographic printing plate precursor's stability, color formability, and on-press developability, resulting in a precursor with excellent printing durability and improved performance during on-press development.
Implementation Method 1
the image-recording layer contains a compound represented by Formula (1)... a decomposition-type infrared absorber... exposing a lithographic printing plate precursor
Implementation Method 2
decomposition-type infrared absorber having a specific structure... removing an unnecessary portion of the image-recording layer at an initial stage of the ordinary printing step
Data Source
AI summary
An on-press development type lithographic printing plate precursor includes: a support; and an image-recording layer on the support, in which the image-recording layer contains a compound represented by Formula (1), a method of preparing a lithographic printing plate using the on-press development type lithographic printing plate precursor, a lithographic printing method, and a novel compound. In the formula, R1 represents a group represented by Formula (2) or Formula (3), R10 represents a monovalent organic group having an aryl group, R11 to R14 and R17 to R20 each independently represent a hydrogen atom, an alkyl group, or an aryl group, R15 and R16 each independently represent a hydrogen atom, an alkyl group, or an aryl group, and at least two of R11 to R20 may be bonded to each other to form a ring structure.