A composition for improving softness of tissue and/or towel products includes lignocellulosic fibers; water; and a hydrophobic softener that includes the reaction product of: (1) at least one di- and/or poly-amine, (2) at least one chain extender having at least two carboxyl groups; and (3) at least one hydrophobic end-capper. The reaction product comprises a hydrophobic substitution of at least about 25 mole percent of the hydrophobic end-capper based on a total number of moles of active amine sites of the reaction product. In addition, a method of improving softness of tissue and/or towel products includes combining the lignocellulosic fibers, the water, and the hydrophobic softener; and creating the tissue and/or towel products.

A polyimide fiber paper-manufacturing method is provided that includes a short fiber-preparing step in which shaved short fibers of a non-thermoplastic polyimide are prepared, and a provisionally-bonded paper-forming step in which the short fibers are mixed with water-soluble polymers which are a material having a decomposition temperature lower than a glass transition point of polyimide, and subjected to wet-papermaking to form provisionally-bonded paper.

A polyimide fiber paper-manufacturing method is provided that includes a short fiber-preparing step in which shaved short fibers of a non-thermoplastic polyimide are prepared, and a provisionally-bonded paper-forming step in which the short fibers are mixed with water-soluble polymers which are a material having a decomposition temperature lower than a glass transition point of polyimide, and subjected to wet-papermaking to form provisionally-bonded paper.

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.

The invention relates to fibrous structures having desirable physical properties, such as good tensile strength, low stiffness and high bulk, manufactured using a fiber furnish comprising cellulosic fibers having a pH of 5.0 or less and at least one strength resin. Not only do structures prepared with acidic fibers have desirable physical properties, they may also be manufactured in an energy efficient manner. To achieve the greatest energy savings it is generally desirable that acidic fibers not be subjected to mechanical treatment, such as by refining, prior to forming the fiber into a fibrous structure. Further, it may be desirable to subject the remainder of the fiber furnish to a minimal degree of mechanical treatment, such as by refining, so as to produce a furnish having a freeness greater than about 550 mL.

The invention relates to fibrous structures having desirable physical properties, such as good tensile strength, low stiffness and high bulk, manufactured using a fiber furnish comprising cellulosic fibers having a pH of 5.0 or less and at least one strength resin. Not only do structures prepared with acidic fibers have desirable physical properties, they may also be manufactured in an energy efficient manner. To achieve the greatest energy savings it is generally desirable that acidic fibers not be subjected to mechanical treatment, such as by refining, prior to forming the fiber into a fibrous structure. Further, it may be desirable to subject the remainder of the fiber furnish to a minimal degree of mechanical treatment, such as by refining, so as to produce a furnish having a freeness greater than about 550 mL.

Provided are a method for manufacturing paper with which it is possible to easily manufacture paper wherein water-filterability and yield are excellent and hydrophilia is suppressed without using a cationic polymer or silica, a device for manufacturing an additive for manufacturing paper, and a device for manufacturing paper. The method for manufacturing paper is a method having a reactant generating step for generating a reactant by subjecting an acrylamide polymer to a Hoffman elimination reaction, and a supply step for supplying the reactant to a paper machine within 24 hours of the start of the Hoffman elimination reaction. The acrylamide polymer preferably includes an acrylamide polymer having a intrinsic viscosity of 12.5-28 dl/g and anionization of 0.3 meq/g or less.

Provided are a method for manufacturing paper with which it is possible to easily manufacture paper wherein water-filterability and yield are excellent and hydrophilia is suppressed without using a cationic polymer or silica, a device for manufacturing an additive for manufacturing paper, and a device for manufacturing paper. The method for manufacturing paper is a method having a reactant generating step for generating a reactant by subjecting an acrylamide polymer to a Hoffman elimination reaction, and a supply step for supplying the reactant to a paper machine within 24 hours of the start of the Hoffman elimination reaction. The acrylamide polymer preferably includes an acrylamide polymer having a intrinsic viscosity of 12.5-28 dl/g and anionization of 0.3 meq/g or less.

The present invention provides a process for producing paper or board, comprising slushing a stock of dried fibres in a slushing system comprising a pulper, and/or feeding a stock of never-dried fibres in a fiber line of an integrated paper mill; deflaking and/or refining the stock in a deflaker and/or a refiner, optionally diluting the deflaked and/or refined stock, directing the deflaked and/or refined stock to a headbox, forming a web, and drying the web, wherein a polymeric paper making additive is added to one or more of the stocks of dried fibres and never-dried fibres before deflaking and/or refining of the stock. The present invention further provides paper and board with improved properties.

The present invention provides a process for producing paper or board, comprising slushing a stock of dried fibres in a slushing system comprising a pulper, and/or feeding a stock of never-dried fibres in a fiber line of an integrated paper mill; deflaking and/or refining the stock in a deflaker and/or a refiner, optionally diluting the deflaked and/or refined stock, directing the deflaked and/or refined stock to a headbox, forming a web, and drying the web, wherein a polymeric paper making additive is added to one or more of the stocks of dried fibres and never-dried fibres before deflaking and/or refining of the stock. The present invention further provides paper and board with improved properties.