Gas-barrier composition
A gas-barrier composition including nanocellulose containing at least one of a sulfuric acid group, a sulfo group, or a phosphoric acid group; and a reactive crosslinking agent.
1. A gas-barrier composition comprising: cellulose nanocrystal containing at least one of a sulfuric acid group or a sulfo group; and a reactive crosslinking agent, wherein the reactive crosslinking agent is polyvalent carboxylic acid and is present in an amount of 10 to 30 parts by mass per 100 parts by mass of the cellulose nanocrystal (solid content).
2. The gas-barrier composition according to claim 1 , further comprising a layered inorganic compound in an amount of 5 to 30 parts by mass per 100 parts by mass of the nanocellulose (solid content).
3. The gas-barrier composition according to claim 1 , further comprising a hydroxyl group-containing polymer in an amount of 5 to 30 parts by mass per 100 parts by mass of the nanocellulose (solid content).
4. The gas-barrier composition according to claim 1 , wherein the polyvalent carboxylic acid is citric acid.
5. The gas-barrier composition according to claim 1 , wherein the nanocellulose contains anionic functional groups in an amount of 0.1 to 4.0 mmol/g.
6. A gas-barrier product comprising a mixture containing the gas-barrier composition according to claim 1 and a polyvalent cationic resin, wherein the mixture forms a layer of the gas-barrier composition on a layer of the polyvalent cationic resin so that the polyvalent cationic resin and the nanocellulose are mixed with each other.
7. The gas-barrier product according to claim 6 , wherein the polyvalent cationic resin is polyethyleneimine.
8. A gas-barrier laminate comprising a gas-barrier layer of the gas-barrier product according to claim 6 , the gas-barrier layer being formed on a substrate.
9. The gas-barrier laminate according to claim 8 , wherein a moisture-resistant resin layer is formed on the gas-barrier layer via an adhesive layer comprising both an epoxy resin and a polyamine resin.