Visible light photoinitiating system for preparing high diffraction efficiency hologram optical polymer material
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United States of America Patent
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Sep 5, 2017
Issued Date -
N/A
app pub date -
May 25, 2012
filing date -
Jul 29, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention provides a visible light photoinitiating system for preparing a holographic photopolymer material with high-diffraction efficiency. The photoinitiating system comprises a photosensitizer and a co-initiator, and its mechanism is that the photosensitizer transforms from ground state to excited state after absorbing photons, and then interacts with the co-initiator through transfer of electrons and protons, which produces an alkyl (or aryl) free radical R and a ketyl radical K; wherein the free radical R initiates the addition polymerization of monomers that are capable of free radical polymerization, whereas the radical K inhibits the chain propagation of the macromolecular free radicals to a certain degree due to the steric hindrance effect, and thus delays the gelation time of the photopolymerization, which helps to increase the phase separation between the polymer and the functional components. A holographic photopolymer material with high-diffraction efficiency can be obtained by employing this visible light photoinitiating system.
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International Classification(s)
- 2012 Application Filing Year
- C08F Class
- 1687 Applications Filed
- 1416 Patents Issued To-Date
- 83.94 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 1 Citation Count
- C08F Class
- 30.09 % this patent is cited more than
- 8 Age
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