Weakly Anionic Polymers for Inkjet Paper Coating Stability
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Solution Overview
Problem
Conventional rheology agents in paper coatings for inkjet printing cause destabilization and high viscosity when used with salts or cationic compounds, leading to inadequate water retention and coating quality.
Innovation Solution
The development and use of new weakly anionic polymer additives, comprising specific monomers such as (meth)acrylic acid and ethylene and propylene oxide-based monomers, which improve viscosity regulation and water retention without causing flocculation reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional rheology agents (anionic polymers) are used in paper coatings containing salts or cationic compounds, then viscosity regulation is achieved, but flocculation reactions occur causing high viscosity and destabilization
Solution Approach 1:
The patent changes the chemical parameters of the rheology agent by using weakly anionic polymers with specific carboxylic acid content (1-20%) and specific molecular weight ranges (10,000-1,000,000 g/mol), which fundamentally alters how the agent interacts with salts and cationic compounds, preventing flocculation while maintaining viscosity regulation
Solution Approach 2:
The invention uses composite polymer structures combining carboxylic acid groups with ether and/or ester linkages in specific ratios, creating a multi-functional rheology agent that simultaneously provides viscosity control, prevents flocculation, and maintains coating stability in the presence of salts and cationic compounds
2Ease of operation
If conventional rheology agents are used to regulate viscosity, then coating spreadability is improved, but water retention is inadequate
Solution Approach 1:
The patent optimizes the molecular weight and carboxylic acid content parameters of the weakly anionic polymer to achieve the right balance between viscosity regulation for spreadability and water retention capabilities, with molecular weights between 10,000-1,000,000 g/mol and carboxylic acid content of 1-20%
3Reliability
If salts or cationic compounds are introduced in large quantities to fix ink droplets, then ink fixation is improved, but medium destabilization occurs
Solution Approach 1:
The weakly anionic polymer acts as an intermediary substance that mediates between the ink-fixing salts/cationic compounds and the coating medium, allowing high concentrations of ink-fixing agents to be used without causing destabilization, as the polymer prevents harmful interactions while maintaining medium 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
These additives effectively thicken the coating while significantly enhancing water retention, maintaining the active compounds on the paper surface and preventing destabilization, resulting in improved coating quality and stability.
Implementation Method 1
allow the viscosity of the medium to be regulated in order to prevent any destabilisation problems
Implementation Method 2
enable the coating's water retention to be improved advantageously
Implementation Method 3
when used in large quantities these products can destabilise the medium
Data Source
AI summary
The present invention concerns weakly anionic polymers including their use in paper coatings, especially those intended for paper for inkjet printing. These additives provide the sought thickening function, while improving water retention very appreciably. The invention also concerns a method of manufacture of such coatings, together with the coatings obtained in this manner.