A method for manufacturing a multi-layered paperboard is disclosed, which includes at least two fibrous layers, in which method at least one layer of the multi-layered paperboard is treated by applying an aqueous solution of a first strength component in dissolved form including anionic strength polymer and/or amphoteric strength polymer composition on a surface of layer, and an aqueous solution of a cationic second strength component in dissolved form is added to a fibre stock from which at least one of the fibrous layers joined together is formed.

A method for manufacturing a multi-layered paperboard is disclosed, which includes at least two fibrous layers, in which method at least one layer of the multi-layered paperboard is treated by applying an aqueous solution of a first strength component in dissolved form including anionic strength polymer and/or amphoteric strength polymer composition on a surface of layer, and an aqueous solution of a cationic second strength component in dissolved form is added to a fibre stock from which at least one of the fibrous layers joined together is formed.

An object is to provide a water-dispersible paper that exhibits excellent dispersibility in water. As a solution, a water-dispersible paper is provided, which has: a base paper that has a bulky layer containing 10% by weight or higher of a softwood pulp with a lumen width (l) to fiber diameter (D) ratio (l/D) of 0.60 or lower on average; and a water-soluble polymer impregnated into the base paper.

An oil resistant article is described that does not contain any fluorocarbon compounds. The oil resistant article includes a basesheet formed from pulp fibers. The basesheet is coated on at least one surface with an oil resistant coating. The basesheet is formed without having to use any highly refined fibers. Various chemical treatments are incorporated into the basesheet and the oil resistant coating is formed from particularly selected polymers that produces an oil resistant article having a relatively high permeability and excellent oil resistant properties.

An oil resistant article is described that does not contain any fluorocarbon compounds. The oil resistant article includes a basesheet formed from pulp fibers. The basesheet is coated on at least one surface with an oil resistant coating. The basesheet is formed without having to use any highly refined fibers. Various chemical treatments are incorporated into the basesheet and the oil resistant coating is formed from particularly selected polymers that produces an oil resistant article having a relatively high permeability and excellent oil resistant properties.

The present invention relates to a bio-based polyelectrolyte complex (PEC) composition suitable as a binder for fiber based materials, textiles, woven and nonwoven materials. The PEC composition comprises cationic biopolymer, anionic biopolymer acid and a polymer, and is further characterized in that the net charge of the PEC is cationic, the charge ratio of the anionic polymer and the cationic polymer is ≤1, the cationic biopolymer is chitosan, wherein the concentration of cation is 0.005-30%, the anionic biopolymer is polyanions derived from nature, the acid is a Brønsted acid and/or a Lewis acid, wherein the Brønsted acid is selected from any organic and/or inorganic acids, wherein the Lewis acid is selected from any cationic mono- or multivalent atom, the weight ratio between cation and anion is 1:0.1 to 1:20, the weight ratio between the cation and acid is 1:0.01 to 1:30, chitosan has a degree of deacetylation being 66-100%, and the pH is less than 7. The present invention further relates to a method for preparing the PEC composition, uses of the PEC composition, as well as method of treating materials with the PEC composition.

The present invention relates to a bio-based polyelectrolyte complex (PEC) composition suitable as a binder for fiber based materials, textiles, woven and nonwoven materials. The PEC composition comprises cationic biopolymer, anionic biopolymer acid and a polymer, and is further characterized in that the net charge of the PEC is cationic, the charge ratio of the anionic polymer and the cationic polymer is ≤1, the cationic biopolymer is chitosan, wherein the concentration of cation is 0.005-30%, the anionic biopolymer is polyanions derived from nature, the acid is a Brønsted acid and/or a Lewis acid, wherein the Brønsted acid is selected from any organic and/or inorganic acids, wherein the Lewis acid is selected from any cationic mono- or multivalent atom, the weight ratio between cation and anion is 1:0.1 to 1:20, the weight ratio between the cation and acid is 1:0.01 to 1:30, chitosan has a degree of deacetylation being 66-100%, and the pH is less than 7. The present invention further relates to a method for preparing the PEC composition, uses of the PEC composition, as well as method of treating materials with the PEC composition.

An object is to provide a water-dispersible paper that exhibits excellent dispersibility in water. As a solution, a water-dispersible paper is provided that has a base paper containing papermaking fibers and a water-soluble alkaline compound, wherein the Canadian Standard Freeness of the papermaking fibers is 500 ml CSF or higher but no higher than 750 ml CSF.

An oil resistant article is described that does not contain any fluorocarbon compounds. The oil resistant article includes a basesheet formed from pulp fibers. The basesheet is coated on at least one surface with an oil resistant coating. The basesheet is formed without having to use any highly refined fibers. Various chemical treatments are incorporated into the basesheet and the oil resistant coating is formed from particularly selected polymers that produces an oil resistant article having a relatively high permeability and excellent oil resistant properties.

An oil resistant article is described that does not contain any fluorocarbon compounds. The oil resistant article includes a basesheet formed from pulp fibers. The basesheet is coated on at least one surface with an oil resistant coating. The basesheet is formed without having to use any highly refined fibers. Various chemical treatments are incorporated into the basesheet and the oil resistant coating is formed from particularly selected polymers that produces an oil resistant article having a relatively high permeability and excellent oil resistant properties.