Copper Phthalocyanine Pigment Composition for Liquid Ink
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing copper phthalocyanine pigment compositions for liquid inks face challenges with storage stability and viscosity, particularly in high-concentration inks, due to poor dispersion stability and calcium interactions, leading to thickening over time.
Innovation Solution
A copper phthalocyanine pigment composition is developed containing copper phthalocyanine, rosin compound, copper phthalocyanine sulfonic acid or its salt, and an aliphatic amine, with a calcium content of 200 ppm or less, produced through dry-milling and treatment with an organic solvent and water mixture, ensuring low calcium content in the process water to enhance transparency, gloss, and storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If copper phthalocyanine pigment is used in liquid ink, then good color strength is achieved, but poor dispersion stability causes thickening over time and reduced storage stability
Solution Approach 1:
The patent removes calcium ions from the system by using calcium-free process water during pigment treatment. This extraction of the harmful calcium component prevents calcium from binding with copper phthalocyanine sulfonic acid, thereby maintaining dispersion stability and preventing thickening over time in liquid ink formulations
Solution Approach 2:
The patent introduces copper phthalocyanine sulfonic acid as an intermediary substance that mediates between the pigment particles and the liquid ink medium. This intermediary provides sulfonic acid groups that improve wetting and dispersion, while the low calcium content ensures these groups remain available for effective interaction rather than being sequestered by calcium ions
2Productivity
If high concentration of pigment is used in base ink for productivity, then production efficiency improves, but viscosity increases and storage stability deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the pigment surface by treating it with copper phthalocyanine sulfonic acid in calcium-free water, creating a surface modification that reduces interparticle attraction. This parameter change allows high pigment concentrations to be achieved in base inks without excessive viscosity increase, enabling productive formulations with improved flow characteristics
3Stability of the object's composition
If copper phthalocyanine sulfonic acid is added to treat pigment surface, then dispersion stability improves, but calcium binding reduces the treatment effectiveness
Solution Approach 1:
The patent applies preliminary anti-action by preventing calcium binding before it can occur. By using calcium-free process water from the outset in the pigment treatment process, the invention pre-empts the harmful calcium-sulfonic acid interaction, ensuring that copper phthalocyanine sulfonic acid remains available to effectively treat the pigment surface and improve dispersion stability
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 composition achieves good transparency, gloss, and initial viscosity suitability, along with outstanding storage stability in liquid ink applications, as demonstrated by low initial and aged viscosity values and improved dispersion stability.
Implementation Method 1
the copper phthalocyanine sulfonic acid binds to the pigment or calcium contained in the process water
Implementation Method 2
dispersion stability of the base ink
Data Source
AI summary
An object is to provide phthalocyanine pigment compositions that have good transparency, gloss, and suitability in the initial viscosity after production as well as outstanding storage stability when used in liquid ink. A copper phthalocyanine pigment composition containing copper phthalocyanine, a rosin compound, copper phthalocyanine sulfonic acid or its salt, and an aliphatic amine with the calcium content of the pigment composition being 200 ppm or less has good transparency, gloss, and suitability in the initial viscosity after production as well as outstanding storage stability when used in liquid ink.