POROUS HOLOGRAPHIC FILM
First Claim
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1. A method for the manufacture of a holographic film, comprising:
- providing a substrate;
arranging a photo-polymerizable composition on said substrate, said composition comprising;
(i) monomers with high reactivity,(ii) monomers with low reactivity,(iii) non-reactive material,(iv) a photo-sensitive polymerization initiator;
exposing said composition to a light-pattern of bright and dark regions to induce polymerization of at least part of said monomers with high reactivity in parts of said composition exposed to bright regions; and
inducing polymerization of said monomers with low reactivity.
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Abstract
The present invention relates to a method for the manufacture of a holographic film. The method includes a polymerizable composition that comprises monomers with high reactivity, monomers with low reactivity and a non-reactive material. The method comprises a patterned exposure to obtain a patterned polymerization of the monomers with high reactivity and a subsequent polymerization to polymerize also monomers with low reactivity to form a solid film. The method gives a holographic film with a high refractive index modulation and a modulated porosity.
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21 Claims
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1. A method for the manufacture of a holographic film, comprising:
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providing a substrate; arranging a photo-polymerizable composition on said substrate, said composition comprising; (i) monomers with high reactivity, (ii) monomers with low reactivity, (iii) non-reactive material, (iv) a photo-sensitive polymerization initiator; exposing said composition to a light-pattern of bright and dark regions to induce polymerization of at least part of said monomers with high reactivity in parts of said composition exposed to bright regions; and inducing polymerization of said monomers with low reactivity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A photo-polymerizable composition comprising monomers with high reactivity, monomers with low reactivity, a photo-initiator and non-reactive material.
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12. Use of a photo-polymerizable composition comprising monomers with high reactivity, monomers with low reactivity, a photo-initiator and non-reactive material to form a solid, porous, holographic film.
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13. A photo-polymerizable element comprising a photo-polymerizable composition, which comprises monomers with high reactivity, monomers with low reactivity, a photo-initiator and non-reactive material, arranged on a substrate.
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14. A holographic film comprising a polymeric film, wherein the refractive index of said polymeric film is periodically spatially modulated between a first and a second refractive index, said first refractive index being higher than said second refractive index,
said polymer film exhibiting a porosity that is periodically spatially modulated between a first and a second porosity, said first porosity being different from said second porosity, and said polymer film comprises at least a first and a second polymerized monomer, the concentration of said first polymerized monomer being periodically spatially modulated, between a first and a second concentration, said first concentration being higher than said second concentration, wherein said first refractive index, first porosity and first concentration are spatially coincident, and wherein said second refractive index, second porosity and second concentration are spatially coincident.
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