Process for increasing the dry strength of paper, board and...

Details Process for increasing the dry strength of paper, board and... Process for increasing the dry strength of paper, board and...

D - Textiles, Paper

21

H

D21H 17/42 (2006.01) D21H 17/37 (2006.01) D21H 17/44 (2006.01) D21H 17/45 (2006.01) D21H 17/48 (2006.01) D21H 17/55 (2006.01) D21H 17/56 (2006.01) D21H 21/18 (2006.01)

Patent

CA 2733503

Method for producing paper, paperboard and cardboard having a high dry strength by adding at least one water-soluble (a) polymer comprising vinyl amine units and at least one (b) polymer comprising ethylene imine units and at least one water-soluble polymeric anionic compound to form a paper material, dewatering the paper material during the formation of sheets, and drying the paper product, wherein the water-soluble cationic polymers (a) and (b) are metered in an arbitrary sequence or as a mixture to form a paper material, and paper products obtained according to the method.

Linvention concerne un procédé pour la fabrication de papier, de carton-pâte et de carton présentant une grande résistance à sec, par l'addition d'au moins un polymère soluble à l'eau contenant des unités de vinylamine (a) et d'au moins un polymère contenant des unités d'éthylène-imine (b) et d'au moins un composé soluble à l'eau polymère et anionique permettant dobtenir une pâte à papier, par la déshydratation de la pâte à papier avec formation de la feuille et par le séchage des produits de papier. On dose les polymères (a) et (b) solubles à l'eau et cationiques dans un ordre de succession quelconque ou sous forme de mélange permettant dobtenir une pâte à papier. Linvention concerne également des papiers qui sont obtenus selon ce procédé.

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