The present invention relates to a process wherein microfibrillated cellulose (MFC) is mixed with at least two retention aids, selected from a cationic or amphoteric polymer and a microparticle or nanoparticle as a pre-mix before dosing it to the stock in a process for manufacture of a fiber based product.

The present invention relates to a process wherein microfibrillated cellulose (MFC) is mixed with at least two retention aids, selected from a cationic or amphoteric polymer and a microparticle or nanoparticle as a pre-mix before dosing it to the stock in a process for manufacture of a fiber based product.

The present invention provides certain paper enhancing compositions, typically aqueous compositions, for use in the manufacture and coating of paper, and paper products. The paper enhancing compositions provide certain paper processing advantages and distinct final paper product characteristics. The present invention further provides carbonate enhancing composition useful for preparing enhanced carbonate compositions used in the paper manufacturing processes.

Disclosed herein are cellulose/polysaccharide composites comprising a) cellulose; and b) an enzymatically-produced polysaccharide, certain derivatives of an enzymatically-produced polysaccharide, or a mixture thereof; wherein the enzymatically-produced polysaccharide and the polysaccharide derivative are water-insoluble. The cellulose is plant-derived. The composites are useful in forming articles such as paper, packaging material, or insulating material.

Disclosed herein are cellulose/polysaccharide composites comprising a) cellulose; and b) an enzymatically-produced polysaccharide, certain derivatives of an enzymatically-produced polysaccharide, or a mixture thereof; wherein the enzymatically-produced polysaccharide and the polysaccharide derivative are water-insoluble. The cellulose is plant-derived. The composites are useful in forming articles such as paper, packaging material, or insulating material.

A paper suitable for use as a separator or thermal or fire insulation for use in or with electrochemical cells, and an electrochemical cell comprising the same, the paper having 90 to 99 weight percent aramid fibrous pulp comprising aramid polymer fibrils and 1 to 10 weight percent polyvinylpyrrolidone present as a coating on the surface of the fibers, the paper having a thickness of 10 to 40 micrometers and a tensile strength of at least 15 megapascals or greater.

A paper suitable for use as a separator or thermal or fire insulation for use in or with electrochemical cells, and an electrochemical cell comprising the same, the paper having 90 to 99 weight percent aramid fibrous pulp comprising aramid polymer fibrils and 1 to 10 weight percent polyvinylpyrrolidone present as a coating on the surface of the fibers, the paper having a thickness of 10 to 40 micrometers and a tensile strength of at least 15 megapascals or greater.

Suspensions can include a polar solvent, sulfonated polyester material dispersed in the polar solvent, and cellulose nanofibril material dispersed in the polar solvent. Suspensions disclosed and contemplated herein leverage polyester that can be used to independently control film formation and rheology. In some instances, polyesters used in suspensions disclosed herein can perform the role of two additives: aqueous thickener and film reinforcement

Suspensions can include a polar solvent, sulfonated polyester material dispersed in the polar solvent, and cellulose nanofibril material dispersed in the polar solvent. Suspensions disclosed and contemplated herein leverage polyester that can be used to independently control film formation and rheology. In some instances, polyesters used in suspensions disclosed herein can perform the role of two additives: aqueous thickener and film reinforcement

A method of and an arrangement for adding a chemical to an approach flow system of a fiber web machine by mixing of a retention chemical to a fibrous stock flowing in an approach flow system of a fiber web machine by a mixer (200) between the attenuator (16) and the headbox (18).