Tinting plastic articles

D - Textiles – Paper – 06 – P

Patent

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Details

D06P 5/20 (2006.01) D06L 3/12 (2006.01) D06P 3/36 (2006.01) G02C 7/02 (2006.01)

Patent

CA 2342853

Plastic articles, especially plastic optical lenses are tinted by immersing the plastic article in an aqueous dispersion of tinting agent and exposing the dispersion and immersed article to microwave radiation to bring the dispersion to ebullition; the ebullition is maintained for at least 2 seconds with transfer of tinting agent from the dispersion to the article to tint the article; the tinted article is removed from the dispersion and rinsed with water. The method achieves tinting in significantly shorter times than conventional methods and employs water-based dispersions thereby avoiding emission of vapors of organic solvents.

L'invention porte sur des articles en plastique, notamment sur des lentilles optiques en plastique qui sont teintées par immersion dans une dispersion aqueuse d'un agent de coloration et par exposition de cette dispersion et de l'article immergé à un rayonnement électromagnétique de façon à porter la dispersion à ébullition. L'ébullition est maintenue pendant au moins 2 secondes pendant lesquelles s'effectue le transfert de l'agent de coloration, de la dispersion vers l'article à teinter. Puis l'article teinté est retiré de la dispersion et rincé avec de l'eau. Ce procédé permet d'effectuer une coloration dans des temps bien plus courts que les procédés traditionnels, et utilise des dispersions à base aqueuse de façon à éviter l'émission de vapeurs de solvants organiques.

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