A method for manufacturing a cellulose nanofiber film is provided. The method includes preparing cellulose nanofiber dispersion, performing a chemical crosslinking by adding an epichlorohydrin-based material to the cellulose nanofiber dispersion to prepare a planar body and performing physical crosslinking in which a metal chloride is added to the planar body.

A method of preparing a resin infused random fiber mat including the step of forming a liquid dispersion mat of polymeric resin and fiber on a porous substrate.

A method of preparing a resin infused random fiber mat including the step of forming a liquid dispersion mat of polymeric resin and fiber on a porous substrate.

The disclosure relates to a curable mixture for use in impregnation of paper bushings comprising a resin mixture of a bisphenol-A-diglycidylether (BADGE) and a bisphenol-F-diglycidylether (BFDGE), methyltetrahydrophthalic anhydride (MTHPA) as hardener, and an accelerator selected from the group consisting of tertiary alkylamine aminoethylalcohols and corresponding ethers thereof as well as paper bushings impregnated with such mixture and uses of such mixture.

The disclosure relates to a curable mixture for use in impregnation of paper bushings comprising a resin mixture of a bisphenol-A-diglycidylether (BADGE) and a bisphenol-F-diglycidylether (BFDGE), methyltetrahydrophthalic anhydride (MTHPA) as hardener, and an accelerator selected from the group consisting of tertiary alkylamine aminoethylalcohols and corresponding ethers thereof as well as paper bushings impregnated with such mixture and uses of such mixture.

The invention pertains to a cellulosic material provided with a coating comprising an oxidized carboxylated starch having a weight-average molecular weight of 0.3−10×10.sup.6 Da and a water-soluble starch extender present in a quantity of 0 to 25 wt. % based on the coating dry weight, selected from a crosslinked cationic polyalkylene amine and a zirconium carbonate, as well as to use thereof in improving the oil and grease resistance of paper. The invention furthermore pertains to a method to improve the oil and grease resistance of a cellulosic material, comprising providing a cellulosic material, coating said material on at least one side with a homogenous aqueous composition comprising an oxidized carboxylated starch having a weight-average molecular weight of 0.3−10×106 Da and 0-3 wt. % of a starch extender, selected from a crosslinked cationic polyalkylene amine and a zirconium carbonate, and drying the cellulosic material.

A method for manufacturing a carbon fiber sheet, the method including a carbon fiber forming step of heating a resin sheet to a carbonization temperature at a heating rate of 15,000° C./sec or higher, thereby forming a carbon fiber from the resin sheet. In the carbon fiber forming step, the resin sheet is preferably irradiated with an energy ray having an output density of 130 W/mm.sup.2 or higher and an amount of irradiation energy of 0.05 J/mm.sup.2 or more.

A method for manufacturing a carbon fiber sheet, the method including a carbon fiber forming step of heating a resin sheet to a carbonization temperature at a heating rate of 15,000° C./sec or higher, thereby forming a carbon fiber from the resin sheet. In the carbon fiber forming step, the resin sheet is preferably irradiated with an energy ray having an output density of 130 W/mm.sup.2 or higher and an amount of irradiation energy of 0.05 J/mm.sup.2 or more.

Embodiments of the present invention relate to a method of making a paper comprising the steps of: a) providing a cationic wet strength resin comprising a polyamidoamine epihalohydrin, a condensation copolymer of epihalohydrin and amine, or combination thereof; b) providing an anionic polymer; c) co-mixing the cationic wet strength resin and the anionic polymer to provide a composition comprising polyelectrolyte complexes; d) providing an aqueous pulp slurry, draining the aqueous pulp slurry on a screen to form a wet fiber web, and drying the wet fiber web to obtain the paper, wherein said co-mixed composition is introduced to the aqueous pulp slurry or on the formed wet fiber web. Embodiments of the present invention further relates to a paper wet strength composition, its use in paper making and a paper obtainable therefrom.

Provided herein are additives for paper compositions comprising poly(ethylene oxide) (PEO) and polyacrylamide polymer that are capable of increasing the ash retention of the paper composition. Also provided are methods of making a paper composition using the additives of the disclosure.