Amine-Functional Inkjet Fluid Set for Hydrolysis-Resistant Adhesion
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Solution Overview
Problem
Existing aqueous resin-based inks face challenges with adhesion, chemical resistance, and hydrolysis issues, particularly when used on temperature-sensitive substrates, leading to inkjet reliability problems and decreased performance over time.
Innovation Solution
A fluid set comprising a compound functionalized with primary or secondary amines and an aqueous inkjet ink with polymeric particles containing oligomers or polymers having specific functional groups, encapsulated to prevent hydrolysis and enhance chemical resistance, is used in conjunction with a primer or overcoat to improve adhesion and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If epoxy compounds are used to achieve good adhesion properties, then adhesion performance is improved, but the ink is prone to hydrolysis during storage
Solution Approach 1:
The patent replaces the unstable epoxy compound with a polymeric particle containing a β-diketone group that is designed to be stable during storage. The reactive functionality is kept dormant until the printing stage when it reacts with the amine-based polymer on the substrate, achieving the desired adhesion without the storage stability issues of epoxy compounds.
Solution Approach 2:
The patent changes the chemical parameters of the ink formulation by using a polymeric particle with a β-diketone group instead of epoxy compounds. This parameter change maintains the adhesion functionality while eliminating the hydrolysis susceptibility, as the β-diketone group is stable in aqueous environments during storage.
2Strength
If resins having β-diketone groups are used to achieve excellent rubbing and scratching resistance, then physical properties are improved, but reactivity decreases upon storage due to hydrolysis
Solution Approach 1:
The patent incorporates the β-diketone functional group into a polymeric particle structure during manufacturing, preparing it in advance for the intended reaction with amine-based polymers. This preliminary preparation ensures the group is present and stable during storage, ready to provide rubbing and scratching resistance when activated during the printing process.
Solution Approach 2:
The patent uses a composite structure where a polymeric particle containing the β-diketone group is formulated within an aqueous ink system. This composite approach allows the β-diketone group to maintain its stability during storage while still providing the desired physical properties of rubbing and scratching resistance when the ink is applied and dries.
3Adaptability or versatility
If aqueous resin based inks are used on temperature sensitive substrates, then substrate compatibility is improved, but adhesion performance and chemical resistance are limited
Solution Approach 1:
The patent applies a dual-function approach where the polymeric particle with β-diketone group provides localized reactivity specifically at the substrate interface. The β-diketone group reacts with amine-based polymers on the substrate to create strong localized bonds, while the aqueous nature of the ink maintains overall compatibility with temperature-sensitive substrates.
Solution Approach 2:
The patent formulates a composite ink system combining aqueous carriers with polymeric particles containing β-diketone groups. This composite structure enables the ink to maintain compatibility with temperature-sensitive substrates through its aqueous base while simultaneously achieving strong adhesion through the chemical reaction capability of the β-diketone groups.
4Object-affected harmful factors
If UV based technology is used to achieve chemical resistance, then chemical resistance is improved, but compatibility with temperature sensitive substrates is reduced
Solution Approach 1:
The patent replaces the UV curing mechanism with a chemical reaction mechanism involving β-diketone groups reacting with amine-based polymers. This substitution eliminates the need for UV exposure and high activation temperatures, thereby maintaining compatibility with temperature-sensitive substrates while still achieving excellent chemical resistance through the formed crosslinked structure.
Solution Approach 2:
The patent changes the activation parameters from UV light exposure and high temperature (required for UV curing) to ambient temperature chemical reaction between β-diketone groups and amine-based polymers. This parameter change allows the process to be compatible with temperature-sensitive substrates while maintaining chemical resistance performance.
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 solution provides reliable inkjet performance, excellent chemical resistance, and maintains image quality over time, even on temperature-sensitive substrates, by preventing hydrolysis and ensuring stable jetting behavior.
Implementation Method 1
an aqueous inkjet ink comprising a colorant and a polymeric particle comprising an oligomer or polymer having at least 3 repeating units comprising a functional group according to general formula I, II or III
Implementation Method 2
Encapsulation based technologies as disclosed in WO2015158654A and EP293337A, avoid film formation at the nozzle of the inkjet head
Data Source
AI summary
A fluid set for inkjet printing comprising a fluid comprising a compound functionalized with at least two functional groups being of a primary amine or a secondary amine, and an aqueous inkjet ink comprising a colorant and a polymeric particle comprising an oligomer or polymer having at least 3 repeating units comprising a functional group according to general formula I, II or III. The fluid is preferably a pre-treatment liquid or over coat liquid.