Method for producing laminated body, laminated body and paper packaging material
AssigneeToppan Printing Co., Ltd.
InventorsAkiko Saiki, Kosuke Shimizu
Life of this patent
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Abstract
A method for producing a laminated body including a base material and a coating layer laminated on the base material, includes: applying a coating liquid containing cellulose nanofibers onto the base material composed of at least acid-resistant paper, thereby forming the coating layer. In addition, an average fiber diameter of the cellulose nanofibers is 2 nm or more and 2000 nm or less, a content of the cellulose nanofibers in the coating liquid is 10 mass % or more of solid contents of the coating liquid, and a coating amount of the coating layer is 0.2 g/m2 or more in dry mass.
Claims11
A method for producing a laminated body including a base material and a coating layer laminated on the base material, the method comprising:
- applying a coating liquid containing cellulose nanofibers onto the base material composed of at least acid-resistant paper, thereby forming the coating layer;
- wherein
- an average fiber diameter of the cellulose nanofibers is 2 nm or more and 2000 nm or less,
- a content of the cellulose nanofibers in the coating liquid is 10 mass % or more of solid contents of the coating liquid,
- a coating amount of the coating layer is 0.2 g/m2 or more in dry mass, and
- the cellulose nanofibers includes:
- first cellulose nanofibers resulted from fibrillating non-chemically treated cellulose raw material, and
- second cellulose nanofibers having a different chemical structure from a chemical structure of the first cellulose nanofibers, the second cellulose nanofibers having carboxyl groups substituted for hydroxyl groups resulted from oxidation based on a 2,2,6,6-tetramethyl-1-piperidine-N-oxy radical.
A laminated body comprising:
- a base material composed of at least acid-resistant paper;
- and
- a coating layer containing cellulose nanofibers and laminated on the base material;
- wherein
- an average fiber diameter of the cellulose nanofibers is 2 nm or more and 2000 nm or less,
- a content of the cellulose nanofibers in the coating layer is 10 mass % or more of the coating layer,
- a coating amount of the coating layer is 0.2 g/m2 or more in dry mass,
- an arithmetic average surface roughness of a surface of the coating layer is 1.1 μm or less, and an adhesion strength between the base material and the coating layer is 1.0 N/15 mm or more, and
- the cellulose nanofibers includes:
- first cellulose nanofibers resulted from fibrillating non-chemically treated cellulose raw material, and
- second cellulose nanofibers having a different chemical structure from a chemical structure of the first cellulose nanofibers, the second cellulose nanofibers having carboxyl groups substituted for hydroxyl groups resulted from oxidation based on a 2,2,6,6-tetramethyl-1-piperidine-N-oxy radical.
Dependencies are inferred from the claim text.