Coating Composition Stabilizes Pigments and Latex
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Solution Overview
Problem
Current inkjet printing technologies require pre-printing priming processes and struggle with maintaining viscosity and stability of coating compositions, leading to issues like bleed and text feathering, especially in high-speed commercial and industrial applications.
Innovation Solution
Incorporating a cationic fixing agent and a stabilizer, such as ethopropoxylated polyarylphenol, into a coating composition applied during the papermaking stage, which forms an ink-receiving layer that stabilizes inorganic pigments and latex, maintaining desirable viscosity and preventing bleed and feathering without the need for a separate fixer fluid or primer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate fixer fluid or primer is applied before printing, then pigment fixation and bleed reduction are improved, but process complexity and production time increase
Solution Approach 1:
The patent combines the fixer fluid and coating composition into a single integrated coating applied during papermaking. The coating contains cationic fixing agents, anionic pigments, and binders that simultaneously provide both fixation and coating functions, eliminating the need for separate fixer fluid or primer applications.
Solution Approach 2:
The coating is applied to the paper substrate during the papermaking process, before printing occurs. This preliminary application of the integrated coating pre-establishes the fixation mechanism and surface properties needed for high-quality printing, eliminating later priming steps.
2Loss of time
If coating composition is stored for extended periods, then manufacturing and distribution are improved, but viscosity stability deteriorates
Solution Approach 1:
The patent uses specific pH ranges (adjusted with acids or bases) and controlled ionic strength in the coating composition to stabilize the system. The cationic fixing agents and anionic pigments are balanced to maintain electrostatic equilibrium, preventing aggregation and viscosity changes during storage.
Solution Approach 2:
The coating composition is formulated as a composite system with cationic fixing agents, anionic pigments, binders, and stabilizers working together. This composite structure creates a balanced colloidal system that resists phase separation and maintains consistent rheological properties over time.
3Productivity
If high-speed printing is performed, then productivity is improved, but print quality deteriorates due to bleed and feathering
Solution Approach 1:
The coating creates a controlled porous structure on the paper surface with appropriate pore size and distribution. This porous network allows rapid ink absorption at high printing speeds while the cationic-anionic interactions prevent excessive spread, maintaining sharp edges and preventing feathering.
Solution Approach 2:
The binders and stabilizers in the coating act as intermediaries between the substrate and pigment particles. They provide anchoring points that secure pigments during high-speed printing, preventing bleed while allowing sufficient ink reception for quality images.
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
This solution enhances print quality by reducing bleed and feathering, maintaining viscosity for extended storage, and allowing high-speed printing without pre-printing priming, thus improving the durability and performance of the printable recording medium.
Implementation Method 1
The stabilization of the coating composition components helps to maintain a desirable viscosity
Implementation Method 2
a stabilizer selected from the group consisting of ethopropoxylated polyarylphenol, ethoxylated tristyrylphenol, modified fatty alcohol polyglycol ethers
Implementation Method 3
the cationic fixer fluid is applied at the surface of the uncoated or coated media... The salts or organic acids in the cationic fixer fluid react with anionic components in the subsequently applied pigmented inkjet ink to fix the pigments
Data Source
AI summary
An example of a coating composition includes an inorganic pigment, a latex, a cationic fixing agent, and a stabilizer selected from the group consisting of ethopropoxylated polyarylphenol, ethoxylated tristyrylphenol, modified fatty alcohol polyglycol ethers, and combinations thereof. Another example of a coating composition consists essentially of an inorganic pigment, a latex, a cationic fixing agent, a stabilizer selected from the group consisting of ethopropoxylated polyarylphenol, ethoxylated tristyrylphenol, modified fatty alcohol polyglycol ethers, and combinations thereof, and water.