Iridescent solid nanocrystalline cellulose films...

C - Chemistry – Metallurgy – 30 – B

Patent

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Details

C30B 29/58 (2006.01) B42D 15/10 (2006.01) C08J 5/18 (2006.01) C08L 1/08 (2006.01) C30B 7/04 (2006.01)

Patent

CA 2745474

A new method to produce solid nanocrystalline cellulose (NCC) films containing patterns by differential heating of aqueous suspensions of NCC has been discovered. When acid-form NCC suspensions are dried by heating to temperatures above 50 °C, darkening of the NCC can occur, while neutral forms of NCC can produce iridescent chiral nematic films by heating to temperatures up to 105 °C. Placing materials of different thermal conductivity beneath the container containing an evaporating NCC suspension results in watermark-like patterns of different iridescent colour imprinted within the film structure. Other colloidal rod-like particles can be employed in place of nanocrystalline cellulose (NCC), for example chitin or chitosan.

L'invention porte sur un nouveau procédé pour produire des films solides de cellulose nanocristalline (NCC) contenant des motifs par un chauffage différentiel de suspensions aqueuses de NCC. Lorsque des suspensions de NCC sous forme acide sont séchées par chauffage à des températures au-dessus de 50°C, un assombrissement de la NCC peut avoir lieu, alors que des formes neutres de NCC peuvent produire des films nématiques chiraux irisés par chauffage à des températures allant jusqu'à 105°C. Placer des matières ayant une conductivité thermique différente au-dessous du récipient contenant une suspension de NCC s'évaporant aboutit à des motifs de type filigrane de couleur irisée différente imprimés au sein de la structure du film. D'autres particules colloïdales de type bâtonnet peuvent être employées à la place de la cellulose nanocristalline (NCC), par exemple de la chitine ou du chitosane.

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