Solidified liquid crystals of cellulose with optically...

C - Chemistry – Metallurgy – 09 – K

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C09K 19/38 (2006.01) C09D 5/29 (2006.01) C09D 5/36 (2006.01) C09D 11/00 (2006.01)

Patent

CA 2182387

Solid films with novel optical properties are produced from colloidal suspensions of cellulose crystallites; the colloidal suspensions are prepared by acid hydrolysis of crystalline cellulose under carefully controlled conditions; the solid materials possess a helicoidal arrangement of the constituent crystallites, by appropriate selection of conditions for preparation and treatment of the colloidal suspensions, solid films are produced that reflect circularly polarized visible light; the wavelength of the reflected light can be controlled to give colours across the visible spectrum from red to violet and if necessary to infrared and ultraviolet wavelengths. The reflected iridescent colours arise from optical interference effects, and change with the viewing angle this makes the materials ideally suited for optical authenticating devices, since no printing or photocopying technique can reproduce this effect, furthermore, they are easily distinguishable from other optical interference devices since thay have additional optical properties.

On produit des feuilles solides présentant des nouvelles propriétés optiques à partir de suspensions colloïdales de cristallites de cellulose préparées par acidolyse de cellulose cristalline dans des conditions soigneusement contrôlées; les matières solides présentent un agencement hélicoïdal des cristallites constituantes; par sélection appropriée des conditions de préparation et de traitement des suspensions colloïdales, on produit des feuilles solides réfléchissant la lumière visible polarisée de manière circulaire; on peut moduler la longueur d'onde de la lumière réfléchie pour donner des couleurs dans le spectre visible du rouge au violet, et, si nécessaire, jusqu'à des longueurs d'onde de l'infrarouge et de l'ultraviolet. Les couleurs iridescentes réfléchies proviennent des effets d'interférence optique et changent avec l'angle de visualisation, ce qui rend ces matières idéales pour les dispositifs d'authentification optique, la technique d'impression ou de photocopie ne pouvant reproduire cet effet. Ces dispositifs sont faciles à distinguer d'autres dispositifs d'interférence optique de par leurs propriétés optiques supplémentaires.

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