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An anisotropic ink based on crystalline nanocellulose: Potential applications in security printing
Author(s) -
Chindawong Chakkresit,
Johannsmann Diethelm
Publication year - 2014
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.41063
Subject(s) - nanocellulose , polarizer , birefringence , materials science , inkwell , polymer , anisotropy , nanotechnology , polymer science , cellulose , optics , composite material , chemical engineering , physics , engineering
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.