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US 2015/0027648 A1Published application
Method for producing anion-modified cellulose nanofiber dispersion
AssigneeNippon Paper Industries Co., Ltd.
InventorsShiho Tsuji, Shoichi Miyawaki, Masahiko Fukazawa, Takeshi Iimori, Naoyuki Tamura, Takeshi Nakayama
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Abstract
Provided is a method which comprises a process of having an anion-modified cellulose nanofiber dispersion contain monovalent or divalent metal ions. Consequently, the fluidity of an anion-modified cellulose nanofiber dispersion obtained thereby is improved.
Claims5
A method for producing an anion-modified cellulose nanofiber dispersion, comprising the steps of:
- (A) preparing anion-modified cellulose;
- and
- (B) defibrating the anion-modified cellulose into nanofibers to prepare the anion-modified cellulose nanofiber dispersion,
- the method further comprising, after the step (B) or between the steps (A) and (B), the step of adding a compound containing a monovalent or divalent metal ion, wherein an amount of the added metal ion is 0.3 to 10% (w/w) based on anion-modified cellulose nanofibers contained in a final anion-modified cellulose nanofiber dispersion.
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A method for producing an anion-modified cellulose nanofiber dispersion, comprising the steps of:
- oxidizing a starting cellulosic material with an oxidizing agent in the presence of an N-oxyl compound and a compound selected from the group consisting of bromides, iodides and mixtures thereof to introduce carboxyl groups into cellulose to prepare anion-modified cellulose;
- subjecting the anion-modified cellulose to alkaline hydrolysis using an oxidizing agent or a reducing agent under alkaline conditions;
- and
- defibrating the anion-modified cellulose contained in a reaction mixture from the alkaline hydrolysis into nanofibers, without washing the cellulose.
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Dependencies are inferred from the claim text.