Paper quality improver

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 21/22 (2006.01) D21H 17/37 (2006.01) D21H 21/18 (2006.01) D21H 21/28 (2006.01) D21H 21/30 (2006.01) D21H 17/44 (2006.01) D21H 17/53 (2006.01) D21H 21/24 (2006.01)

Patent

CA 2492931

A paper improver for use in papermaking which, even when a pulp feedstock is formed into a sheet under high-speed conditions, enables the sheet to be improved in bulkiness, whiteness, opacity, and paper strength. The paper improver comprises, in a specific proportion by weight, (A) a copolymer comprising structural units derived from one or more nonionic monomers having a solubility parameter of 20.5 (MPa)1/2 or smaller and structural units derived from one or more anionic or cationic monomers and (B) a surfactant. It produces at least one of the following paper quality-improving effects: (i) the degree of improvement in standard bulkiness is 0.02 g/cm3 or higher, (ii) the degree of improvement in standard opacity is 1.0 point or higher, and (iii) the degree of improvement in standard whiteness is 0.5 points or higher.

L'invention concerne un agent améliorant pour papier destiné à être utilisé dans la fabrication du papier qui, même lorsqu'une charge d'alimentation de pâte est transformée en une feuille dans des conditions de vitesse élevée, permet d'améliorer le bouffant, la blancheur, l'opacité de la feuille et la résistance du papier. L'agent améliorant pour papier comprend, en une proportion spécifique en poids, (A) un copolymère comprenant des unités structurales dérivées d'un ou de plusieurs monomères non ioniques ayant un paramètre de solubilité de 20,5 (MPa)?1/2¿ ou moins, et des unités structurales dérivées d'un ou de plusieurs monomères anioniques ou cationiques et (B) un tensioactif. Il produit au moins un des effets suivants améliorant la qualité du papier: (i) le degré d'amélioration du bouffant standard est de 0,02 g/cm?3¿ ou plus, (ii) le degré d'amélioration de l'opacité standard est de 1,0 point ou plus, (iii) le degré d'amélioration de la blancheur standard est de 0,5 point ou davantage.

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