Laser-Markable Ink Using Conductive Polymer IR Absorbers
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Solution Overview
Problem
Current laser-markable materials often require high-power CO2 lasers and struggle to effectively change color using low-energy laser light, limiting their versatility and efficiency in printing applications.
Innovation Solution
The development of an ink composition incorporating a pigment, a solvent, a conductive polymer, and optionally a binder, which includes IR absorbers like ammonium octamolybdate (AOM), allowing for marking substrates with low-energy laser light, enabling the use of low-power lasers and achieving color changes through valence state changes or non-stoichiometric product formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional laser-markable materials are used, then high-power CO2 lasers can achieve marking, but the requirement for high-power lasers increases energy consumption and device complexity
Solution Approach 1:
The patent changes the optical absorption parameters of the ink composition by incorporating IR absorbers that specifically absorb at CO2 laser wavelengths (10,600 nm). This allows the material to efficiently convert laser energy into the desired marking effect, enabling the use of lower power lasers while maintaining marking effectiveness.
Solution Approach 2:
The invention creates a composite ink formulation combining pigments, solvents, conductive polymers, and IR-absorbing materials. This composite approach synergistically combines materials with different functions: the IR absorber captures laser energy, the conductive polymer facilitates electron transfer, and the pigment provides color change, collectively enabling efficient low-power laser marking.
2Use of energy by moving object
If conventional laser-markable materials are used, then marking can be achieved, but the ability to use low-energy laser light is limited
Solution Approach 1:
The patent modifies the energy absorption characteristics of the marking material by incorporating IR absorbers with specific absorption spectra matched to CO2 laser wavelengths. This parameter change enables the material to effectively absorb low-energy laser light and convert it into sufficient thermal and chemical energy for reliable marking.
Solution Approach 2:
The IR absorber acts as an intermediary that mediates between the low-energy laser light and the pigment molecules. It absorbs the laser energy and facilitates energy transfer to the conductive polymer and pigment, enabling the marking process to proceed effectively with low-power lasers.
3Ease of manufacture
If simple ink formulations are used, then manufacturing is easier, but multi-color capabilities and versatility are reduced
Solution Approach 1:
The patent creates a universal ink formulation platform where the core components (IR absorber, conductive polymer, solvent system) remain constant while allowing interchangeable pigment additives. This multi-functional base formulation provides laser absorption, electron conduction, and color variation capabilities, enabling easy production of multi-color inks by simply changing the pigment component.
Solution Approach 2:
The ink formulation is segmented into distinct functional modules: IR absorber component, conductive polymer component, solvent system, and pigment component. This segmentation allows independent optimization and selection of each component, simplifying manufacturing while enabling versatility through different pigment combinations for multi-color capabilities.
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
This solution enables the use of low-energy lasers for effective marking, providing sharp and well-defined images with improved versatility in printing, including multi-color capabilities and compatibility with various substrates and polymer systems, while maintaining fire-retardant properties.
Implementation Method 1
IR absorbers in laser-markable compositions, and particular materials that have been found to have utility as IR absorbers
Implementation Method 2
marking substrates with low-energy laser light, enabling the use of low-power lasers and achieving color changes
Implementation Method 3
a conductive polymer, and optionally also a binder, preferably but not essentially having a labile group
Implementation Method 4
achieving color changes through valence state changes or non-stoichiometric product formation
Implementation Method 5
AOM is a readily available material that has fire-retardant properties
Data Source
AI summary
A laser-markable composition comprises a pigment, a solvent and a conductive polymer that absorbs IR radiation. This can be used to mark a substrate, using a low-energy laser.