Method for producing paper, paperboard and cardboard having high dry strength
First Claim
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1. A process for the production of paper, board, and cardboard having high dry strength, the process comprising:
- (I) metering into a paper stock an aqueous composition comprising a nanocellulose comprising cellulose fibers and at least one anionic polymer and optionally a water-soluble cationic polymer;
(II) draining the paper stock, to obtain paper product; and
(III) drying the paper product;
wherein the anionic polymer comprises, as polymerized units;
(a) at least one monomer selected from the group consisting of a C1- to C20-alkyl acrylate, a C1- to C20-alkyl methacrylate, a vinyl ester of a saturated carboxylic acid comprising up to 20 carbon atoms, a vinylaromatic comprising up to 20 carbon atoms, an ethylenically unsaturated nitrile, a vinyl ester of a saturated, monohydric alcohol comprising 1 to 10 carbon atoms, a vinyl halide, and an aliphatic hydrocarbon comprising 2 to 8 carbon atoms and one or two double bonds;
(b) at least one anionic monomer selected from the group consisting of an ethylenically unsaturated C3- to C8-carboxylic acid, a vinylsulfonic acid, acrylamido-2-methylpropanesulfonic acid, styrenesulfonic acid, vinylphosphonic acid, and salts thereof;
(c) optionally, at least one monomer selected from the group consisting of a C1- to C10-hydroxyalkyl acrylate, a C1- to C10-hydroxyalkyl methacrylate, acrylamide, methacrylamide, an N—
C1- to C20-alkylacrylamide, and an N—
C1- to C20-alkylmethacrylamide; and
(d) optionally, a monomer comprising at least two ethylenically unsaturated double bonds in the molecule.
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Abstract
Process for the production of paper, board and cardboard having high dry strength by addition of an aqueous composition comprising a nanocellulose and at least one polymer selected from the group consisting of the anionic polymers and water-soluble cationic polymers, draining of the paper stock and drying of the paper products.
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Citations
17 Claims
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1. A process for the production of paper, board, and cardboard having high dry strength, the process comprising:
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(I) metering into a paper stock an aqueous composition comprising a nanocellulose comprising cellulose fibers and at least one anionic polymer and optionally a water-soluble cationic polymer; (II) draining the paper stock, to obtain paper product; and (III) drying the paper product; wherein the anionic polymer comprises, as polymerized units; (a) at least one monomer selected from the group consisting of a C1- to C20-alkyl acrylate, a C1- to C20-alkyl methacrylate, a vinyl ester of a saturated carboxylic acid comprising up to 20 carbon atoms, a vinylaromatic comprising up to 20 carbon atoms, an ethylenically unsaturated nitrile, a vinyl ester of a saturated, monohydric alcohol comprising 1 to 10 carbon atoms, a vinyl halide, and an aliphatic hydrocarbon comprising 2 to 8 carbon atoms and one or two double bonds; (b) at least one anionic monomer selected from the group consisting of an ethylenically unsaturated C3- to C8-carboxylic acid, a vinylsulfonic acid, acrylamido-2-methylpropanesulfonic acid, styrenesulfonic acid, vinylphosphonic acid, and salts thereof; (c) optionally, at least one monomer selected from the group consisting of a C1- to C10-hydroxyalkyl acrylate, a C1- to C10-hydroxyalkyl methacrylate, acrylamide, methacrylamide, an N—
C1- to C20-alkylacrylamide, and an N—
C1- to C20-alkylmethacrylamide; and(d) optionally, a monomer comprising at least two ethylenically unsaturated double bonds in the molecule. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An aqueous composition, comprising:
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a nanocellulose comprising cellulose fibers, wherein at least 80% of the cellulose fibers have a fiber thickness of from 50 μ
m to 3 nm, and from 5 ppm to 2% by weight of an ionic liquid, based on a total mass of the nanocellulose;at least one anionic polymer; and optionally, a water-soluble cationic polymer; wherein the anionic polymer comprises, as polymerized units; (a) at least one monomer selected from the group consisting of a C1- to C20-alkyl acrylate, a C1- to C20-alkyl methacrylate, a vinyl ester of a saturated carboxylic acid comprising up to 20 carbon atoms, a vinylaromatic comprising up to 20 carbon atoms, an ethylenically unsaturated nitrile, a vinyl ester of a saturated, monohydric alcohol comprising 1 to 10 carbon atoms, a vinyl halide, and an aliphatic hydrocarbon comprising 2 to 8 carbon atoms and one or two double bonds; (b) at least one anionic monomer selected from the group consisting of an ethylenically unsaturated C3- to C8-carboxylic acid, a vinylsulfonic acid, acrylamido-2-methylpropanesulfonic acid, styrenesulfonic acid, vinylphosphonic acid, and salts thereof; (c) optionally, at least one monomer selected from the group consisting of a C1- to C10-hydroxyalkyl acrylate, a C1- to C10-hydroxyalkyl methacrylate, acrylamide, methacrylamide, an N—
C1- to C20-alkylacrylamide, and an N—
C1- to C20-alkylmethacrylamide; and(d) optionally, a monomer comprising at least two ethylenically unsaturated double bonds in the molecule.
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Specification