Solenis Technologies, L.p.

Solenis Technologies Cayman, L.p.

Ralph Isermann

Anton Esser

Hans-Joachim Haehnle

Christoph Hamers

Christopher Alan Gray

Frans De Bruyn

Methods for producing final polymer A are provided that comprise the following steps: Certain final polymers A obtained are useful for a method for producing paper or cardboard comprising adding certain final polymers A to a first aqueous pulp suspension, dewatering the obtained second aqueous pulp suspension containing certain final polymers A on a water-permeable substrate to a wet paper structure, and further dewatering of the wet paper structure into a paper or cardboard.

Method for the hydrolysis of a polymer

Methods for producing paper or cardboard are provided that comprise the steps

Method for producing paper or cardboard

A method for producing dried multilayer paper is provided comprising dewatering a first aqueous fibrous suspension, thereby creating a first fibrous web; dewatering a second aqueous fibrous suspension, thereby creating a second fibrous web; spraying one or more of a first fibrous web and a second fibrous web with a spray solution or spray suspension, thereby producing at least one sprayed fibrous web; assembling the first fibrous web with the second fibrous web; dehydrating the resulting layer compound by pressing; then dehydrating by supplying heat, which creates the dried multilayer paper. The spray solution or spray suspension contains water and at least one water-soluble polymer P. The polymer P is obtained by polymerizing: 40 to 85 mol % of a monomer of Formula I in which R=H or C-C-Alkyl; and 15 to 60 mol % of one or more ethylenically unsaturated monomers.

Method for producing multi-layer paper

A method to produce dried single-layer or multi-layer paper is disclosed. The method comprises, for a single-layer paper, preparing and spraying a partially dehydrated first fibrous web with a spray solution or suspension to give a sprayed partially dehydrated first fibrous web, and dehydrating the sprayed partially dehydrated first fibrous web by applying heat to form a dried single-layer paper; or, for a multi-layer paper, preparing and spraying a partially dehydrated layer compound with a spray solution or suspension to form a sprayed layer compound, and dehydrating the sprayed layer compound by applying heat to form a dried multi-layer paper. The spray solution or suspension comprises water and at least one water-soluble polymer P, which is obtained by polymerizing: (i) a monomer of formula HCCHNHC(0)R, where Ris H or C-C- alkyl; and (ii) one or more ethylenically unsaturated monomers different from monomer (i).

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Ludwigshafen, Germany

Ralph Isermann