Photopolymer Formulation Adjustable Mechanical Modulus
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Solution Overview
Problem
Existing processes for producing holographic media cannot vary mechanical properties without significantly changing the refractive index contrast, making it difficult to meet diverse mechanical requirements such as laminability, durability, and security features without compromising hologram brightness.
Innovation Solution
A process involving a photopolymer formulation with a combination of amorphous network matrix polymers, monofunctional and polyfunctional writing monomers, photoinitiators, and optional additives, where the ratio of these components is adjusted to achieve a mechanical modulus between 0.1 and 160 MPa while maintaining a refractive index contrast of at least 0.008, allowing for varying mechanical properties without altering the refractive index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the chemical composition is modified to vary mechanical properties, then the mechanical modulus can be changed, but the refractive index contrast also changes significantly
Solution Approach 1:
The patent applies parameter changes by systematically varying the functional monomer content (from 5% to 40% by weight) and the ratio of monofunctional to polyfunctional writing monomers to achieve different mechanical moduli (from less than 0.7 MPa to more than 15 MPa) while maintaining the refractive index contrast above 0.008. This allows independent optimization of mechanical properties without compromising optical performance.
Solution Approach 2:
The patent uses composite materials by combining different types of writing monomers (monofunctional and polyfunctional) with matrix polymers in specific ratios. This composite approach enables tuning of mechanical properties through the synergistic interaction of components while preserving the optical properties through careful selection of the overall composition.
2Ease of manufacture
If a low modulus is used for laminability, then the medium can be laminated without additional adhesive, but the medium lacks resistance to damage from external influences
Solution Approach 1:
The patent applies dynamics by providing a system where the mechanical modulus can be dynamically adjusted according to the specific application requirements. By changing the functional monomer content and monomer ratio, the same photopolymer formulation system can produce media with low modulus for laminability or high modulus for damage resistance, making the system adaptable to different functional needs.
3Reliability
If a high modulus is used for damage resistance, then the medium is insensitive to damage from external influences, but the medium cannot be laminated without additional adhesive
Solution Approach 1:
The patent resolves this contradiction by enabling parameter changes in the mechanical modulus through adjustment of functional monomer content and monomer ratios. This allows the selection of appropriate modulus values based on whether laminability or damage resistance is the primary requirement for the specific application.
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
Enables the production of holographic media with adjustable mechanical properties to suit different applications, from flexible to rigid, without compromising hologram brightness or refractive index contrast, thus meeting diverse functional requirements.
Implementation Method 1
C) a photoinitiator system... iv) the medium as a whole is exposed to UV radiation in order to fix the hologram
Implementation Method 2
The holographic media obtainable with the aid of the photopolymer formulations are distinguished by high brightness, which is described physically by their high refractive index contrast (Δn)
Data Source
AI summary
The subject matter of the invention is a method for producing illuminated, holographic media comprising a photopolymer formulation having the adjustable mechanical modulus GUV. A further subject matter of the invention is an illuminated, holographic medium that can be obtained by means of the method according to the invention.