Fluid set for inkjet printing
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Solution Overview
Problem
Existing resin-based aqueous inkjet inks face issues with inkjet reliability due to spontaneous film formation at the nozzle and chemical instability, particularly on temperature-sensitive substrates, and encapsulated polymers suffer from hydrolysis during prolonged storage.
Innovation Solution
A fluid set comprising an aqueous inkjet ink with polymeric particles functionalized with 1,3-diketone, β-keto-aldehyde, or 1,3-dialdehyde groups, encapsulated in a polymeric shell, and stabilized by electrostatic or steric methods, ensuring hydrolytic stability and compatibility with temperature-sensitive substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encapsulated core shell systems are used to avoid film formation at the nozzle, then inkjet reliability is improved, but activation temperature becomes too high for temperature sensitive substrates
Solution Approach 1:
The patent changes the chemical parameters of the encapsulation system by using polymers with at least three functional groups (1,3-diketone, β-keto-aldehyde, or 1,3-dialdehyde) instead of conventional two-functional-group systems. This parameter change reduces the activation temperature while maintaining the protective encapsulation function, enabling printing on temperature-sensitive substrates like poly(olefins) without compromising inkjet reliability
Solution Approach 2:
The invention creates a composite encapsulation system combining a polymeric shell with specific functional groups (1,3-diketone, β-keto-aldehyde, or 1,3-dialdehyde) that work synergistically to provide both protection against film formation and reduced activation temperature. This composite material approach allows simultaneous achievement of reliability and temperature compatibility
2Adaptability or versatility
If latex based inks are used, then resin based aqueous inkjet technology is achieved, but spontaneous film formation at the inkjet head nozzle occurs
Solution Approach 1:
The patent introduces an intermediary encapsulation layer (polymeric shell with specific functional groups) that mediates between the latex-based ink formulation and the inkjet nozzle. This intermediary prevents direct interaction between the latex components and the nozzle surface, eliminating spontaneous film formation while preserving the benefits of resin-based aqueous inkjet technology
3Temperature
If encapsulated polymeric β-keto-esters or amides are used, then compatibility with temperature sensitive substrates is improved, but hydrolysis occurs upon prolonged storage
Solution Approach 1:
The patent replaces the hydrolytically unstable β-keto-ester and amide functional groups with hydrolytically stable alternative functional groups (1,3-diketone, β-keto-aldehyde, or 1,3-dialdehyde). These alternative groups provide the same temperature compatibility benefit without the hydrolysis drawback, effectively creating a more stable long-term solution
Solution Approach 2:
The invention changes the chemical stability parameter by selecting functional groups with inherent hydrolytic stability. The use of 1,3-diketone, β-keto-aldehyde, or 1,3-dialdehyde groups with at least three functional groups per polymer modifies the chemical composition to resist hydrolysis while maintaining temperature sensitivity compatibility
Data Source
AI summary
A fluid set for inkjet printing comprising a fluid having a compound functionalized with at least two functional groups selected from the group consisting of a primary amine and a secondary amine, and an aqueous inkjet ink comprising a colorant and a polymeric particle comprising an oligomer or polymer comprising at least three repeating units functionalized with a functional group selected from the group consisting of a 1,3-diketone, a 0-keto-aldehyde and a 1,3-dialdehyde, with the proviso that the active methylene is functionalized with at least one hydrogen. The fluid is preferably a pre-treatment liquid or over coat liquid.