Cholesteric Liquid Crystal Pigment Composition for Anti-Counterfeit Identification
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Solution Overview
Problem
Existing anti-counterfeit printed matters using conventional cholesteric liquid crystal resins have limitations in expressible color, leading to a demand for an identification medium with enhanced designability and anti-counterfeit effects.
Innovation Solution
A pigment composition comprising a first cholesteric liquid crystal pigment with a center wavelength of 400 nm to 800 nm and a selective reflection bandwidth of 150 nm or less, and a second cholesteric liquid crystal pigment with a selective reflection bandwidth of 200 nm or more within the same wavelength range, used in a specific ratio to achieve a paler color recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional cholesteric liquid crystal resin is used as a pigment in anti-counterfeit printed matter, then the anti-counterfeit effect is achieved, but the expressible color is limited
Solution Approach 1:
The patent combines two different cholesteric liquid crystal pigments with distinct selective reflection bandwidths to create a composite pigment composition. The first pigment has a narrow selective reflection bandwidth (150 nm or less) while the second has a wider bandwidth (200 nm or more). This composite approach enables the expression of paler colors that cannot be achieved with a single pigment type, thereby expanding color expressibility while maintaining anti-counterfeit functionality through the combined optical properties of both pigments.
Solution Approach 2:
The patent utilizes parameter changes in the selective reflection bandwidth of cholesteric liquid crystal pigments to achieve different color expressions. By carefully selecting and controlling the bandwidth parameters of the two pigments used in combination, the invention enables the visual recognition of paler colors. The specific bandwidth parameters (150 nm or less for the first pigment, 200 nm or more for the second) are optimized to create the desired optical effect while maintaining authenticity verification capability.
2Adaptability or versatility
If a single cholesteric liquid crystal pigment is used, then the anti-counterfeit effect is maintained, but the designability is reduced
Solution Approach 1:
The invention employs a composite pigment composition consisting of two cholesteric liquid crystal pigments with different selective reflection bandwidths. This composite structure enables enhanced designability by allowing the expression of paler colors that cannot be achieved with single pigments. The combination of the first pigment (narrow bandwidth: 150 nm or less) and the second pigment (wide bandwidth: 200 nm or more) provides versatile color expression options while maintaining a relatively simple two-component structure that does not excessively increase complexity.
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 pigment composition enables the creation of an identification medium with excellent designability and anti-counterfeit effects, allowing for visual recognition of a color that is paler than that originating from the first cholesteric liquid crystal pigment.
Implementation Method 1
a first cholesteric liquid crystal pigment which has a center wavelength of a selective reflection band within a wavelength range of 400 nm or more and 800 nm or less, and a selective reflection bandwidth of 150 nm or less
Implementation Method 2
a second cholesteric liquid crystal pigment which has a selective reflection bandwidth of 200 nm or more within a wavelength range of 400 nm or more and 800 nm or less
Implementation Method 3
when a pigment composition containing a specific first cholesteric liquid crystal pigment and a specific second cholesteric liquid crystal pigment with a specific ratio is used, a color which is paler than that originating from the first cholesteric liquid crystal pigment can be made visually recognizable
Data Source
AI summary
A pigment composition includes first and second cholesteric liquid crystal pigments. The first cholesteric liquid crystal pigment has a center wavelength of a selective reflection band within a wavelength range of 400 nm or more and 800 nm or less and a selective reflection bandwidth of 150 nm or less. The second cholesteric liquid crystal pigment has a selective reflection bandwidth of 200 nm or more within a wavelength range of 400 nm or more and 800 nm or less. The selective reflection band of the first cholesteric liquid crystal pigment and a selective reflection band of the second cholesteric liquid crystal pigment at least partially overlap with each other. A containing amount of the first cholesteric liquid crystal pigment relative to a total amount of the first and second cholesteric liquid crystal pigments is more than 30% by weight and 80% by weight or less.