Ink Formulation Using Photoacid Generator for Non-Permeable Media
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Solution Overview
Problem
Inkjet recording methods face issues such as image blurring due to ink blurring and unequalized image density, especially when printing on non-permeable media or coated papers, which affects the quality and fixability of printed images.
Innovation Solution
An ink formulation containing an anionic compound, water, a photoacid generator, and specific organic solvents with a solubility parameter of 9 to 11.8 (J/cm3)1/2, where the photoacid generator decomposes upon UV radiation to produce an acid that aggregates the anionic compound, preventing beading and color bleeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ink formulations are used for inkjet printing, then printing can be performed on various media, but image blurring and color bleeding occur especially on non-permeable media and coated papers
Solution Approach 1:
The patent modifies the chemical composition parameters of the ink by incorporating specific anionic compounds (such as anionic surfactants and anionic polymers) in controlled concentrations (0.1-10% and 1-20% respectively), along with cationic compounds, to change the interfacial properties and electrostatic interactions between ink and substrate, thereby preventing color bleeding and improving image fixability on challenging media
Solution Approach 2:
The patent employs a composite ink formulation combining multiple functional components: anionic compounds (surfactants and polymers), cationic compounds, and specific organic solvents. This composite approach creates synergistic effects where the anionic-cationic interactions enhance ink cohesion and adhesion, preventing both color bleeding and image blurring simultaneously
2Manufacturing precision
If ink formulations are optimized for image quality, then color bleeding is reduced, but unequalized image density and poor fixability on non-permeable media persist
Solution Approach 1:
The patent adjusts multiple ink composition parameters simultaneously: anionic compound concentration (0.1-10%), cationic compound concentration (0.01-5%), and organic solvent selection, to optimize the balance between ink cohesion (preventing color bleeding) and substrate interaction (ensuring fixability on non-permeable media and uniform density across the printed image)
Solution Approach 2:
The anionic and cationic compounds act as intermediaries that mediate the interaction between ink and substrate. The electrostatic attraction between oppositely charged compounds creates a stable ink film that adheres well to non-permeable media while maintaining uniform distribution, thus simultaneously improving fixability and density uniformity
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 ink effectively prevents beading and color bleeding on printed images, enhancing image quality and fixability on various media types, including non-permeable surfaces and coated papers.
Implementation Method 1
the photoacid generator decomposes upon UV radiation to produce an acid that aggregates the anionic compound
Data Source
AI summary
An ink contains an anionic compound, water, a photoacid generator, and one or more organic solvents containing at least one organic solvent having a solubility parameter of from 9 to 11.8 (J/cm3)1/2.