Lithographic Printing Plate Development with pH-Controlled Surfactant
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Solution Overview
Problem
Existing methods for preparing lithographic printing plates using aqueous near-neutral solutions suffer from poor developing properties, resulting in residual photosensitive layer in non-image areas, satin in non-image areas, and unevenness in image areas.
Innovation Solution
A method involving a lithographic printing plate precursor with a photosensitive layer containing a sensitizing dye, radical polymerization initiator, radical polymerizable compound, and binder polymer, exposed with a laser and developed using a developer with a specific pH and surfactant, such as those represented by certain chemical formulas, to remove unexposed areas effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If development is conducted with an aqueous near-neutral solution, then the simplification of wet treatment is achieved, but the developing property deteriorates resulting in residual photosensitive layer
Solution Approach 1:
The patent changes the chemical parameters of the developer by incorporating specific surfactants (nonionic, anionic, or cationic types) and adjusting pH to 3-9, which fundamentally alters the development mechanism to enable effective removal of photosensitive layer while maintaining near-neutral conditions, thus resolving the contradiction between simplification and developing effectiveness
Solution Approach 2:
The developer is formulated as a composite system containing multiple components including surfactants, buffers, and optional additives in specific concentration ranges, which work synergistically to achieve both the simplification of treatment and the required developing precision by combining gentle aqueous base with active surfactant agents
2Ease of manufacture
If development is conducted with an aqueous near-neutral solution, then the simplification of wet treatment is achieved, but satin occurs in the non-image area
Solution Approach 1:
By adjusting the pH range to 3-9 and incorporating specific surfactant concentrations (0.1-10% by weight), the patent modifies the chemical environment to prevent satin formation while maintaining the simplification benefits of near-neutral development, eliminating the harmful effect without sacrificing ease of manufacture
3Ease of manufacture
If development is conducted with an aqueous near-neutral solution, then the simplification of wet treatment is achieved, but unevenness occurs in the image area
Solution Approach 1:
The patent optimizes the chemical parameters including pH (3-9), surfactant concentration (0.1-10% by weight), and buffer capacity to ensure uniform development across the image area, preventing unevenness while preserving the simplification advantages of aqueous near-neutral development
Solution Approach 2:
The formulation includes buffer components that provide chemical feedback control during development, automatically maintaining stable pH conditions and uniform reaction rates across the plate surface, which prevents unevenness in the image area while keeping the process simple
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 achieves good developing properties without residue in non-image areas and ensures no satin or unevenness in the printed material, even when using an aqueous near-neutral solution for development.
Implementation Method 1
containing (A) a sensitizing dye
Implementation Method 2
containing (B) a radical polymerization initiator, (C) a radical polymerizable compound
Implementation Method 3
exposing with a laser a lithographic printing plate precursor
Implementation Method 4
the developer contains a compound represented by the following formula <1>, <2> or <3>
Data Source
AI summary
A method for preparation of a lithographic printing plate including: exposing with a laser a lithographic printing plate precursor including a support and a photosensitive layer containing a sensitizing dye, a radical polymerization initiator, a radical polymerizable compound and a binder polymer; and subjecting the exposed lithographic printing plate precursor to development processing with a developer having pH of from 3 to 9 to remove an unexposed area of the photosensitive layer, wherein the binder polymer is a polymer having an acid value of from 10 to 250 mg-KOH/g and the developer contains a compound represented by one of the formulae <1>, <2> and <3> defined herein.