Process for obtaining a transparent article with a refractive index gradient
First Claim
1. Process for obtaining a transparent article with a refractive index gradient, characterized in that it includes the following steps:
- (1) irradiating a crosslinkable liquid mixture of base photopolymerizable monomers which is modulated spatially in intensity and/or irradiation time to form a structure gradient according to an index profile until a self-supporting polymer matrix is obtained;
(2) swelling the said polymer matrix to thermodynamic equilibrium in a swelling composition containing a polymerization initiator and one or more polymerizable monomers producing a polymer of different refractive index from the refractive index of the matrix obtained in step (1);
(3) polymerizing the swelling composition which has diffused into the matrix homogeneously, thereby obtaining a transparent article with a refractive index gradient.
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Abstract
Process for obtaining a transparent article with a refractive index gradient, including the steps of: (1) irradiating a crosslinkable liquid mixture of base photopolymerizable monomers which is modulated spatially in intensity and/or irradiation time to form a structure gradient according to a desired index profile until a self-supporting polymer matrix is obtained; (2) swelling the polymer matrix to thermodynamic equilibrium in a swelling composition containing a polymerization initiator and one or several polymerizable monomers producing a polymer of different refractive index from the refractive index of the matrix obtained in step (1); and (3) polymerizing the swelling composition which has diffused into the matrix homogeneously, thereby obtaining a transparent article with a refractive index gradient.
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32 Claims
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1. Process for obtaining a transparent article with a refractive index gradient, characterized in that it includes the following steps:
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(1) irradiating a crosslinkable liquid mixture of base photopolymerizable monomers which is modulated spatially in intensity and/or irradiation time to form a structure gradient according to an index profile until a self-supporting polymer matrix is obtained; (2) swelling the said polymer matrix to thermodynamic equilibrium in a swelling composition containing a polymerization initiator and one or more polymerizable monomers producing a polymer of different refractive index from the refractive index of the matrix obtained in step (1); (3) polymerizing the swelling composition which has diffused into the matrix homogeneously, thereby obtaining a transparent article with a refractive index gradient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification