Metallic Gloss Ink Composition With Low Hydrogen Generation
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Solution Overview
Problem
Ink compositions containing brilliant pigments, particularly those with metal components, degrade due to oxidation, leading to deterioration of metallic gloss when stored for extended periods.
Innovation Solution
An ink composition with a hydrogen generation limit of 1 ml or less per 100 g, using a non-aqueous or active energy ray-curable formulation with specific particle size and protective layers to suppress oxidation and maintain metallic gloss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the ink composition contains a brilliant pigment with metal components, then metallic gloss is achieved, but the ink degrades due to oxidation of the metal component during storage
Solution Approach 1:
A chelating agent is introduced as an intermediary substance that forms stable complexes with metal ions in the brilliant pigment. This chelating agent acts as a mediator between the metal component and the oxidizing environment, preventing direct oxidation while preserving the metallic gloss. The chelating agent binds to metal ions, creating a protective complex that resists oxidation during storage.
Solution Approach 2:
The patent creates a chemically inert environment within the ink composition by using specific solvents and additives that prevent oxidation. The formulation includes antioxidants and creates a low-oxygen environment that protects the metal-containing brilliant pigment from oxidizing, thereby maintaining both metallic gloss and storage stability.
2Duration of action of stationary object
If the ink composition is stored for long periods, then it can be used for on-demand printing, but the metal component oxidizes and gloss deteriorates
Solution Approach 1:
The chelating agent and antioxidants are incorporated into the ink composition before storage begins, performing preliminary protective action. These substances are pre-positioned to prevent oxidation before it can occur, ensuring the metal component remains stable throughout the storage period. This preliminary protection allows long-term storage without gloss deterioration.
Solution Approach 2:
The patent converts the potential harmful effect of metal ions into a beneficial stable complex through chelation. The chelating agent transforms free metal ions, which would otherwise oxidize, into stable complexes that are resistant to oxidation. This converts the harmful oxidizability of metal components into a stable, long-lasting metallic gloss.
3Reliability
If hydrogen generation is not controlled, then component degradation occurs, but maintaining low hydrogen generation requires specific formulation constraints
Solution Approach 1:
The patent controls hydrogen generation by carefully adjusting formulation parameters, specifically the types and amounts of solvents, chelating agents, and other additives. By changing these chemical parameters within specific ranges, the formulation achieves low hydrogen generation while maintaining printability and stability, balancing component stability with formulation manageability.
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 ink composition maintains high storage stability and metallic gloss by reducing hydrogen generation and component degradation, ensuring consistent print quality.
Implementation Method 1
the ink composition may be degraded by the oxidation of the metal component
Data Source
AI summary
An ink composition has a high storage stability such that decomposition of the components contained in the ink composition can be minimized. This ink composition, which is discharged by using the inkjet method, contains a luminescent pigment, and the amount of hydrogen generated per 100 g of the ink composition measured in a room temperature and normal pressure environment is 1 mL or less. The ink composition may be an active energy ray-curable ink composition or a non-aqueous ink composition containing an organic solvent.