PHOTOPOLYMER FOR VOLUME HOLOGRAPHIC RECORDING AND ITS PRODUCTION PROCESS
First Claim
1. A photopolymer for volume holographic recording through refraction index difference, characterized by the presence of an expansion agent that forms gas in micro-bubbles in unexposed regions of the holographic fringe, comprising per weight:
- a) 70% to 90% of a thermoplastic “
polymer’
, b) 10% to 30% of a preferably mono-functional photopolymerizable monomer reactive to light, c) 1% to 10% of an expansion agent that when heated at a minimum 75°
C. produces a gas and forms bubbles in the unhardened or monomer polymerized areas of the hologram and, d) 0.1% to 1% of a photoinitiator that activates the polymerization of the said monomer with exposure of the actinic radiation.
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Accused Products
Abstract
The present invention refers to the manufacturing method of a holographic film and its development; the compositions of the films used in this invention are substantially solid and applied on a substrate in film or glass form; the photopolymerizable layer consists of a thickness of about 10 to 100 μm (microns), consisting of: a) 70% to 90% over the total weight of a thermoplastic “polymer”, b) 10% to 30% over the total weight of a preferably mono-functional photopolymerizable monomer reactive to light and, c) 1% to 10% per weight of an expansion agent that when heated at a minimum of 75° C. produces a gas in the unhardened or monomer polymerized areas of the hologram; furthermore, the composition contains a photoinitiator system sensitive to visible light, surfactants, plasticizers, etc.; photopolymerizable monomers used in this invention contains at least one part unsaturated ethylene with a boiling temperature equal or higher than 100° C.
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Citations
7 Claims
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1. A photopolymer for volume holographic recording through refraction index difference, characterized by the presence of an expansion agent that forms gas in micro-bubbles in unexposed regions of the holographic fringe, comprising per weight:
- a) 70% to 90% of a thermoplastic “
polymer’
, b) 10% to 30% of a preferably mono-functional photopolymerizable monomer reactive to light, c) 1% to 10% of an expansion agent that when heated at a minimum 75°
C. produces a gas and forms bubbles in the unhardened or monomer polymerized areas of the hologram and, d) 0.1% to 1% of a photoinitiator that activates the polymerization of the said monomer with exposure of the actinic radiation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- a) 70% to 90% of a thermoplastic “
Specification