UV-Curable Security Ink Composition for Fluorescent Print Homogeneity
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Solution Overview
Problem
Rylene-based dyes in UV curable ink compositions suffer from insufficient fluorescence, light fastness, and poor solubility, leading to deteriorated printing performance and the need for high amounts that compromise ink homogeneity and printability.
Innovation Solution
A UV curable security ink composition comprising 40-95 wt% radically curable monomers or oligomers, 0.1-20 wt% free radical photoinitiator, 0.005-5 wt% rylene-based compound P with specific substituents, and optional additives, cured using UV-LED light at 360-410 nm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymer grafted rylene-based compounds are used to increase solubility, then solubility in ink compositions is improved, but fluorescence intensity deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the rylene-based compounds by introducing specific substituent groups (formula 3) that modify both solubility and fluorescence properties. This allows optimization of the molecular structure to achieve good solubility in UV curable ink compositions while maintaining high fluorescence intensity, resolving the trade-off between these two properties.
2Measurement precision
If high amounts of rylene-based dyes are added to ensure good detection, then detection quality is improved, but printing performance deteriorates
Solution Approach 1:
By modifying the molecular structure of rylene-based compounds with specific substituents, the patent achieves high detection quality at lower concentrations. This structural optimization allows the dye to maintain strong fluorescence signals while being compatible with UV curable ink compositions, thus improving printing performance without sacrificing detection capability.
3Measurement precision
If rylene-based dyes are used in UV curable ink compositions, then security feature detection is improved, but ink homogeneity deteriorates
Solution Approach 1:
The patent introduces specific substituent groups (formula 3) on rylene-based compounds that enhance solubility in the UV curable ink composition matrix. This chemical modification ensures uniform distribution and stable composition of the ink, preventing precipitation or aggregation, while maintaining high detection capability through preserved fluorescence properties.
4Illumination intensity
If conventional rylene-based dyes are used, then fluorescence is achieved, but light fastness deteriorates
Solution Approach 1:
The patent modifies the chemical structure of rylene-based compounds by introducing specific substituent groups that enhance both fluorescence intensity and light fastness. These structural changes protect the fluorophore from photodegradation while maintaining strong fluorescence emission, thus improving the durability and longevity of the security features under UV exposure and environmental conditions.
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
Enhances fluorescence, improves solubility, and ensures homogeneous printability with minimal dye content, facilitating easy detection and preventing printing defects.
Implementation Method 1
UV curable ink compositions are known in the art and are widely used to impart security features. These are cured through rapid photo-induced polymerizations.
Implementation Method 2
Fluorescent rylene-based dyes or pigments are known in the art (e.g. US20080167467) for high-end covert security features.
Data Source
AI summary
The invention relates to the field of UV curable security ink compositions comprising rylene-based compounds, radically curable monomers, oligomers or mixtures thereof, and radical photoinitiators. The invention further relates to security features obtained by applying or printing the security ink compositions, articles or documents containing said security features and method of preparing the security features comprising the UV curable security ink compositions.