Slurry composition and method for polishing organic...

C - Chemistry – Metallurgy – 09 – G

Patent

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C09G 1/02 (2006.01) B24B 1/00 (2006.01) B24B 7/30 (2006.01)

Patent

CA 2679340

The present invention provides a slurry composition and method for polishing organic polymer- based ophthalmic substrates. The slurry composition according to the invention includes an aqueous dispersion of abrasive particles and a pyrrolidone compound. The abrasive particles can be alumina, zirconia, silica, titania or combinations of the foregoing. Slurry compositions according to the invention can be used to polish all types of organic polymer-based ophthalmic substrates, but are particularly useful for polishing organic polymer-based ophthalmic substrates having an index of refraction greater than 1.498 because they remove such materials at a greater efficiency than conventional slurry compositions without detrimentally affecting the quality of the resulting surface.

La présente invention concerne une composition de pâte et un procédé de polissage de substrats ophtalmiques à base de polymère organique. La composition de pâte selon l'invention comprend une dispersion aqueuse de particules abrasives et un composé de pyrrolidone. Les particules abrasives peuvent être de l'alumine, de la zircone, de la silice, du dioxyde de titane ou des combinaisons de ces matériaux. Les compositions de pâte selon l'invention peuvent être utilisées pour polir tous types de substrats ophtalmiques à base de polymère organique, mais sont particulièrement utiles pour le polissage de substrats ophtalmiques à base de polymère organique qui ont un indice de réfraction supérieur à 1,498 car elles éliminent de tels matériaux avec une meilleure efficacité que les compositions de pâte classiques sans effet négatif sur la qualité de la surface résultante.

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