Polymerized Films with Line Texture for Forgeryproof Markings
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Solution Overview
Problem
Existing forgeryproof markers based on chiral nematic compounds are unsatisfactory due to limitations in optical properties and ease of detection, necessitating the development of novel polymers with improved optical properties for use in optical filters and forgeryproof markings.
Innovation Solution
A process involving the thermal treatment of polymeric films composed of achiral nematic polymerizable monomers, with or without chiral dopants, to create films with line or fingerprint textures, which are then polymerized using UV light, allowing for the formation of layers with specific optical properties suitable for optical filters and forgeryproof markings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If chiral nematic compounds are used for forgeryproof markings, then optical properties are enhanced, but detection ease and ease of manufacture deteriorate
Solution Approach 1:
The patent uses achiral nematic polymerizable monomers instead of chiral nematic compounds, fundamentally changing the chemical parameter (chirality) while maintaining the liquid crystalline phase. This substitution enables simpler manufacturing through UV polymerization while preserving the desired line texture optical properties that enhance detection.
Solution Approach 2:
The patent replaces the complex chiral molecular structure with an achiral monomer system that achieves similar optical effects through UV-induced polymerization and thermal treatment. This substitution simplifies the manufacturing process by eliminating the need for chiral dopants and complex chiral nematic phase control.
2Illumination intensity
If chiral nematic compounds are used for forgeryproof markings, then optical properties are enhanced, but detection ease deteriorates
Solution Approach 1:
By changing from chiral to achiral monomers and using UV polymerization, the patent creates a system where the line texture forms during polymerization itself. This parameter change makes the forgeryproof marking inherently visible through its formation process, improving detection ease while maintaining optical properties.
3Illumination intensity
If thermal treatment is applied during polymerization, then line texture forms enhancing optical properties, but process complexity increases
Solution Approach 1:
The patent merges the thermal treatment step with the UV polymerization process, applying both simultaneously during a single operation. This combination eliminates separate processing steps, reducing overall process complexity while achieving the desired line texture and optical properties.
Solution Approach 2:
The patent incorporates the thermal treatment as a preliminary action before or during polymerization to pre-establish the liquid crystalline orientation. This preliminary orientation control simplifies the subsequent polymerization process and ensures consistent line texture formation without requiring complex post-processing.
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 process produces polymerized films with unique line or fingerprint textures that enhance optical properties, making them suitable for use in optical filters and forgeryproof markings, improving detection ease and durability.
Implementation Method 1
When substances with shape anisotropy are heated, liquid-crystalline phases, known as mesophases, can occur. The nematic liquid-crystalline phase features parallel alignment of the longitudinal axes of the molecules
Implementation Method 2
The composition comprises at least one achiral nematic polymerizable monomer which is polymerizable with UV light
Implementation Method 3
the thermal treatment of polymeric films during or after polymerizing a composition which comprises an achiral nematic polymerizable monomer leads to the formation of a line texture on the films formed thereby
Data Source
AI summary
The present invention relates to a process for producing polymerized films with line texture or fingerprint texture or for producing substrates coated with polymerized films with line texture or fingerprint texture, to polymerized films, obtainable by this process, with line texture or fingerprint texture or substrates coated with polymerized films with line texture or fingerprint texture, to pigments obtainable by comminuting such films, to the use of such films, substrates or pigments as or in optical filter(s), polarizers, decorative media, forgeryproof markers, reflective media or for focusing light (in solar cells), to the use of such films as an antibacterial coating, to a forgeryproof marker which comprises such a film, and to a process for detecting forgeryproof markings.