Chiral Liquid Crystal Polymer Marking for Anti-Counterfeiting
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Solution Overview
Problem
Current methods for securing products against counterfeiting and market diversion, such as cholesteric liquid crystal polymers, face challenges in ensuring authenticity at the individual item level and are either complex or require high-power lasers for marking, making them inefficient for high-speed industrial processes.
Innovation Solution
A process involving applying a chiral liquid crystal precursor composition onto a substrate, heating it to a chiral liquid crystal state, and locally modifying it with a modifying agent to create a secure marking, which can be cured and polymerized for enhanced security features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-power lasers are used to carbonize the liquid crystal polymer material for creating visible markings, then the marking visibility is improved, but the energy consumption and process complexity increase significantly
Solution Approach 1:
The patent changes the physical-chemical parameters of the liquid crystal system by introducing a chiral dopant that responds to low-power laser irradiation. Instead of using high-power lasers to carbonize the material, the system uses a chiral liquid crystal composition where the chiral dopant induces helical twisting that can be locally modified by low-power laser exposure, creating visible markings through optical property changes rather than thermal carbonization.
2Measurement precision
If high-power lasers are used to create markings on liquid crystal polymer films, then the marking visibility is improved, but the productivity decreases due to the complexity and time required for the carbonization process
Solution Approach 1:
The patent transforms the marking mechanism from thermal carbonization (slow, high-energy) to optical property modification via chiral dopant alignment (fast, low-energy). The chiral liquid crystal composition allows markings to be created by simply changing the molecular orientation in response to low-power laser irradiation, eliminating the need for prolonged high-power laser exposure and subsequent cooling periods.
Solution Approach 2:
The patent replaces the mechanical/thermal carbonization process with an optical field-based marking mechanism. Instead of using mechanical heat generation from high-power lasers to carbonize the polymer, the system uses the optical properties of chiral liquid crystals that respond to low-power laser irradiation by changing their helical structure, thereby creating visible markings through optical contrast rather than physical carbonization.
3Stability of the object's composition
If chiral liquid crystal polymers are used for authentication marking, then the temperature independence of optical properties is improved, but the ease of manufacture decreases due to the complexity of the liquid crystal polymerization process
Solution Approach 1:
The patent uses a composite material system consisting of a liquid crystal polymer matrix combined with a chiral dopant. The chiral dopant (such as a cholesterol derivative or other chiral molecule) is dispersed within the liquid crystal polymer matrix, creating a composite where the chiral molecules induce helical twisting of the liquid crystal molecules. This composite structure provides temperature-independent optical properties while maintaining relatively simple manufacturing through solution casting or co-polymerization methods.
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 method allows for the creation of secure, temperature-independent optical properties that can be easily implemented in high-speed industrial processes, providing effective authentication and tracking features without the need for high-power lasers.
Implementation Method 1
When illuminated with white light the cholesteric liquid crystal structure reflects light of a predetermined color (predetermined wavelength range) which is a function of the employed materials and generally varies with the angle of observation and the device temperature
Implementation Method 2
the observed color (predetermined wavelength range) is only due to a physical reflection effect at the cholesteric helical structure
Implementation Method 3
heating the applied composition to bring same to a chiral liquid crystal state
Data Source
Figure 1~2
AI summary
A liquid crystal polymer marking is obtainable by a process that comprises applying a chiral liquid crystal precursor composition onto a substrate, heating the composition to a bring same to a chiral liquid crystal state, locally applying at least one modifying agent to modify the chiral liquid crystal state, and curing and/or polymerization the resultant product.