Coating composition of nano cellulose, its uses and a method for its manufacture
AssigneePaper and Fibre Research Institute
InventorMarco Iotti
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Abstract
The invention relates to an aqueous coating composition of nano cellulose (e.g., microfibrillated cellulose), characterized in that has a dry matter concentration of 2%-12% of nano cellulose and comprises at least one cationic surfactant, which may be chosen among Hexadecyltrimethyl-ammonium bromide, Octadecyltrimethyl-ammonium bromide, Hexadecylpyridinium chloride and Tetradecyl trimethyl-ammonium bromide, Dodecyl pyridinium chloride. The invention also pertains to use of the composition as a coating layer and as an oxygen barrier layer. Further it relates to substrates, e.g., board, cardboard or paper coated with the composition. Moreover, the invention pertains to a process for preparing the coating composition.
Claims20
Aqueous coating composition of nano cellulose, comprising a concentration of 2-12% of nano cellulose dry matter by weight of the composition and at least one cationic surfactant.
A process for preparing a coating composition comprising 2-12% nano cellulose dry matter by weight of the composition and at least one cationic surfactant, comprising:
- a) preparing nano cellulose;
- b) optionally centrifuging or evaporating the obtained nano cellulose to a concentration in the interval of 1-6% dry matter by weight of the composition;
- c) adding the at least one cationic surfactants;
- and
- d) concentrating the mixture to a concentration in the interval of 2-12% dry matter by weight of the composition.
Dependencies are inferred from the claim text.