Process for gradient refractive index optical objects

G - Physics – 02 – B

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G02B 6/028 (2006.01) B29D 11/00 (2006.01)

Patent

CA 2216773

An improved process, preferably continuous, for the manufacture of gradient refractive index optical objects, wherein a core polymer, which itself may be prepared by a continuous and incorporated process, is passed through a hollow porous surrounding, generally cylindrical so as to obtain and maintain a rounded fiber, through which is fed a second monomer whose polymer has a lower refractive index than the core polymer, so as to swell the core polymer. The swollen polymer with a gradient of swelling by the second monomer from surface to core, is then led to a polymerization unit to complete the polymerization before equilibration of the second monomer throughout the core polymer occurs. The resulting polymers are useful in the preparation of optical fibers and light pipes.

Cette invention concerne un procédé amélioré et, de préférence, continu de fabrication d'articles optiques à gradient d'indice de réfraction dont le coeur en polymère, qui peut être lui-même fabriqué selon un procédé continu intégré, est passé dans un milieu poreux creux généralement cylindrique de manière à obtenir et maintenir une section cylindrique. Un deuxième monomère dont le polymère a un indice de réfraction inférieur à celui du polymère formant le coeur de la fibre est injecté dans ce même milieu poreux creux pour faire gonfler ledit polymère. Le polymère ainsi gonflé est acheminé vers une unité de polymérisation pour achever la polymérisation avant stabilisation du deuxième monomère tout le long du coeur polymère. Les polymères ainsi obtenus sont utiles dans la fabrication de fibres optiques.

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