The present invention relates to a paper or paperboard substrate having barrier properties, which substrate comprises a single or multiply structure with e.g. a top ply, a middle ply and a bottom ply, wherein at least one of said top ply and said bottom ply is provided with a high-density bio-barrier layer, and wherein said top or bottom ply provided with the high-density bio-barrier layer and said top or bottom ply not provided with the high-density bio-barrier layer have both been subjected to grafting with a fatty acid halide.

A composite includes a fiber and a dextrin, wherein at least part of the dextrin adheres to the fiber, and the dextrin has a DE value of 0.25 or more and 3.60 or less.

Compounds, monomers, and compositions that are useful for modifying the properties of fiber-based materials, and methods of manufacturing those materials are described.

Compounds, monomers, and compositions that are useful for modifying the properties of fiber-based materials, and methods of manufacturing those materials are described.

A composition for sizing paper includes alkenylsuccinic anhydride (ASA) as the sizing agent and an emulsifier system of anionic emulsifiers and nonionic components, wherein the anionic emulsifiers are chosen from alkali metal salts of aliphatic carboxylic acids or aliphatic dicarboxylic acids and the nonionic components are chosen from polyethylene glycols.

A composition for sizing paper includes alkenylsuccinic anhydride (ASA) as the sizing agent and an emulsifier system of anionic emulsifiers and nonionic components, wherein the anionic emulsifiers are chosen from alkali metal salts of aliphatic carboxylic acids or aliphatic dicarboxylic acids and the nonionic components are chosen from polyethylene glycols.

A composite body includes starch composite particles containing starch, a plasticizer, and a crosslinking agent, and fibers, the starch composite particles being dispersed between the fibers.

A composite body includes starch composite particles containing starch, a plasticizer, and a crosslinking agent, and fibers, the starch composite particles being dispersed between the fibers.

The invention discloses a sample preservation method which comprises the following steps: a) providing a paper substrate comprising ligands, where the ligands comprise charged groups, b) applying a sample comprising at least one analyte and at least one contaminant on the paper substrate, c) drying the sample on the paper substrate and, d) extracting at least part of the paper substrate to provide a solution of the analyte.

Disclosed is a method for stabilisation, hydrophobation and enhanced durability treatment of a ligno-cellulosic material. The method includes the steps of applying a cross-linking formulation including at least one cross-linking acid and at least one polyol, and hydophobation emulsion to a ligno-cellulosic material. The chemically treated material is then subjected to a temperature initiating an esterification reaction between the cross-linking acid, the hydroxyl groups of the cellulose and the polyol. Also disclosed is a bio-based material obtainable by the method.