Organic Fluorescent Crystal Form for Durable Security Inks
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Solution Overview
Problem
Existing crystal forms of fluorescent compounds used in security printing lack thermal stability and chemical resistance, leading to issues with ink durability and longevity under harsh conditions.
Innovation Solution
Development of a new crystal form of a fluorescent compound characterized by specific X-ray diffraction peaks, which is thermally more stable and resistant to chemicals, providing improved thermal stability and chemical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing crystal forms of fluorescent compounds are used in security printing, then the printing can be produced, but the ink lacks thermal stability and chemical resistance, leading to poor durability and longevity under harsh conditions
Solution Approach 1:
The patent applies parameter changes by discovering and utilizing a new crystal form (Form B) of the fluorescent compound with different molecular packing and intermolecular interactions. This crystal form exhibits enhanced thermal stability and chemical resistance compared to existing forms, directly improving ink durability under harsh conditions while maintaining the fluorescent properties needed for security printing
Solution Approach 2:
The patent creates a composite system by combining the new crystal form of the fluorescent compound with specific ink formulation components. This composite approach enhances both thermal stability and chemical resistance, resolving the contradiction between reliability and compositional stability in security printing inks
2Reliability
If existing crystal forms of fluorescent compounds are used in security printing, then the printing can be produced, but the ink lacks chemical resistance, leading to poor durability under harsh conditions
Solution Approach 1:
The patent utilizes parameter changes by transitioning to a new crystal form (Form B) with altered molecular arrangement and stronger intermolecular forces. This structural parameter change confers superior chemical resistance to the ink, preventing degradation from chemical exposure while maintaining printability and fluorescent properties for security applications
3Duration of action of stationary object
If existing crystal forms of fluorescent compounds are used in security printing, then the printing can be produced, but the ink lacks longevity under harsh conditions
Solution Approach 1:
The patent applies parameter changes by discovering a new crystal form (Form B) with enhanced thermal stability characteristics. This structural parameter improvement directly extends the operational lifespan and longevity of the security printing ink, ensuring it maintains its properties under prolonged exposure to harsh thermal and chemical 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
The new crystal form exhibits enhanced thermal stability, chemical resistance, and longevity, making it suitable for security printing applications, particularly in banknotes, with improved process stability, reproducibility, and storage stability.
Implementation Method 1
characterized in an X-ray diffraction pattern by diffraction peaks corresponding to two theta scattering angles of 8.0; 12.3; 14.0 and 21.3
Implementation Method 2
The x-ray diffraction patterns are measured with Cu—Kalpha radiation
Data Source
AI summary
The present invention relates to a new crystal form of the compound of formula and a process for its preparation. The compound may be used in compositions for inks, paints and plastics, especially in a wide variety of printing systems and is particularly well-suited for security applications.