Ink Composition Diol Mixture for Bleed Suppression
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Solution Overview
Problem
Water-based inks with diol-based solvents tend to have high permeability, leading to ink bleed and diffusion into writing surfaces, as the quicker-drying solvents cause pigments to spread and penetrate, resulting in unsatisfactory writing performance.
Innovation Solution
An ink composition combining carbon black or organic pigments, water, polysaccharides, and particles of acrylic resin, where the diols include a first diol with 5-7 carbon atoms and a second diol with 1-4 carbon atoms, with the first diol at a content of 0.05 wt% or more, to adjust permeability and prevent pigment diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a diol-based solvent with high permeability is used to improve drying property, then the drying speed is improved, but ink bleed and pigment diffusion occur
Solution Approach 1:
The patent changes the parameter of diol carbon atom count to control permeability. By using a mixture of diols with different carbon atom counts (first diol: 5-7 carbons for permeability, second diol: 1-4 carbons for low permeability), the invention optimizes the balance between drying speed and ink bleed suppression. The specific content requirement (first diol ≥0.05 wt%) ensures adequate permeability while preventing excessive bleed.
Solution Approach 2:
The patent creates a composite solvent system by combining multiple diols with different properties. The first diol (5-7 carbon atoms) provides high permeability for quick drying, while the second diol (1-4 carbon atoms) provides low permeability to prevent bleed. This composite approach allows simultaneous achievement of both drying speed improvement and ink bleed suppression.
2Speed
If diol-based solvent is used to improve drying property, then drying performance is improved, but pigment diffusion into writing surface occurs
Solution Approach 1:
The patent adjusts the chemical parameters of the diol mixture to control solvent permeability. By specifying the carbon atom count ranges (first diol: 5-7, second diol: 1-4) and the minimum content of the first diol (0.05 wt%), the invention precisely controls pigment diffusion while maintaining rapid drying performance.
Solution Approach 2:
The diol mixture acts as an intermediary between the pigment and the writing surface. The specific composition of diols (combining high-permeability and low-permeability components) mediates the interaction, allowing rapid solvent evaporation while preventing pigment from diffusing into the writing surface.
3Speed
If quick-drying diol-based solvent is used, then drying speed increases, but ink permeation into object increases
Solution Approach 1:
The patent employs a composite diol system where the first diol (5-7 carbon atoms) contributes to high drying speed through increased permeability, while the second diol (1-4 carbon atoms) limits overall ink permeation. The synergistic combination allows rapid drying without excessive ink penetration into the writing surface.
Solution Approach 2:
The patent optimizes the concentration parameters of the diol mixture, specifically requiring the first diol to be present at ≥0.05 wt%. This parameter control ensures sufficient permeability for quick drying while preventing excessive ink permeation into the object.
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 composition achieves both quick-drying properties and effective bleed suppression by controlling permeability and adhering the acrylic resin particles to the writing surface, ensuring pigments remain at the writing position.
Implementation Method 1
a quicker-drying dial-based solvent is high in permeability into an object to be written such as a paper surface or cloth
Implementation Method 2
the particles of the acrylic resin are adhered and fixed to the object to be written when writing on the object to be written
Implementation Method 3
a coloring component such as a pigment may diffuse on the object to be written or in the object to be written as a liquid component of the ink permeates into the object to be written
Data Source
AI summary
An ink composition contains a carbon black and/or an organic pigment, water, a polysaccharide, two or more of diols, and particles of an acrylic resin. The two or more of diols include a first diol having from 5 to 7 carbon atoms and a second diol having from 1 to 4 carbon atoms, and a content of the first diol in the ink composition is 0.05 wt % or more.