An anisotropic ink based on crystalline nanocellulose: Potential applications in security printing |
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| Authors: | Chakkresit Chindawong Diethelm Johannsmann |
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| Affiliation: | Institute of Physical Chemistry, Clausthal University of Technology, Clausthal‐Zellerfeld, Germany |
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| Abstract: | Polymer dispersions containing crystalline nanocellulose have been used as birefringent inks. When printed onto dark paper, the letters are darker than the background if viewed without polarizers, while they are brighter than the background if viewed with crossed polarizers. This type of contrast inversion can have applications in security printing and optical authentication. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 41063. |
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| Keywords: | cellulose and other wood products coatings colloids latices optical properties |
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