Neutralized Multi-Amine Dispersant Ink Stability
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Solution Overview
Problem
Conventional packaging inks face compatibility issues with amine-functional dispersants due to unfavorable interactions with binders like nitrocellulose and organometallic complexes, leading to gel formation and increased viscosity, which affects the stability and performance of the ink.
Innovation Solution
The development of polymeric dispersants with an average of at least two amine groups per molecule, where at least 60% of these amine groups are neutralized with a functionalized acid component, such as sulfonic or phosphoric acid, to form an amine salt, mitigating these interactions and improving compatibility with ingredients like organometallic complexes and nitrocellulose.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If amine-functional dispersants are used to disperse pigment Yellow 13, then anchoring to pigment surface is improved, but gel formation occurs due to unfavorable interactions with nitrocellulose binder
Solution Approach 1:
The patent changes the chemical parameter of the dispersant by neutralizing amine groups with carboxylic acid to form carboxylate salts, transforming the dispersant from amine-functional to salt-functional. This parameter change eliminates the unfavorable interactions with nitrocellulose binder while retaining pigment dispersing capability.
Solution Approach 2:
The carboxylate salt acts as an intermediary form between the amine dispersant and the binder system. By converting amine groups to carboxylate salts, the dispersant mediates its function without directly interacting unfavorably with nitrocellulose or organometallic complexes, thus preventing gel formation.
2Reliability
If amine-functional dispersants are used to disperse pigment, then dispersion performance is improved, but viscosity increases due to reaction with organometallic complexes
Solution Approach 1:
The patent modifies the functional parameter of the dispersant by converting amine groups to carboxylate salts through neutralization with carboxylic acid. This parameter change prevents unwanted reactions with organometallic complexes while preserving the dispersant's ability to anchor to pigment surfaces.
3Stability of the object's composition
If non-ionic or acid-based dispersants are used instead of amine-functional dispersants, then compatibility with binder is improved, but anchoring to pigment surface is reduced
Solution Approach 1:
The carboxylate salt form serves as an intermediary that combines benefits of both amine and acid-based dispersants. It provides improved compatibility with nitrocellulose binder like acid-based dispersants while maintaining anchoring capability to pigment surface through the carboxylate functionality.
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 the performance of packaging inks by preventing gel formation and maintaining stability, ensuring suitable interaction with additives and binders, thereby improving the overall ink formulation.
Implementation Method 1
at least about 60 percent of the amine groups present in the polymeric dispersant are each individually neutralized with a molecule of the functionalized acid component
Data Source
AI summary
Described are compositions including: (a) a polymeric dispersant including: (i) an average of at least two polyether pendant groups per molecule; and (ii) an average of at least two amine groups per molecule; and (b) a functionalized acid component including sulfonic acid and/or phosphoric acid functionalized with at least one of an aromatic functional group or a fatty functional group; and wherein at least about 60 percent of the amine groups present in the polymeric dispersant are each individually neutralized with a molecule of the functionalized acid component. Also described are pigment dispersions and/or ink formulations including these compositions, as well as various methods of making and/or using the compositions, pigment dispersions, and/or ink formulations.