Blends of glyoxalated polyacrylamides and paper...

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 17/06 (2006.01) D21H 17/07 (2006.01) D21H 17/37 (2006.01) D21H 17/41 (2006.01) D21H 17/42 (2006.01) D21H 17/44 (2006.01) D21H 17/45 (2006.01) D21H 21/00 (2006.01) D21H 21/18 (2006.01) D21H 21/20 (2006.01) D21H 27/00 (2006.01)

Patent

CA 2744334

Compositions comprising a blend of two or more paper strengthening agents have improved stability compared with previously known paper strengthening agents. One component is a polymeric paper strengthening agent, preferably a wet strengthening agent. The other component is a stabilized glyoxalated polyacrylamide prepared by (1) reacting a first portion of glyoxal with a polyacrylamide having pendant amide groups to form a first reaction mixture comprising glyoxalated polyacry-lamide; (2) adding an acid to the first reaction mixture to form a second reaction mixture having a reduced pH and comprising the glyoxalated polyacrylamide; and (3) adding a second portion of glyoxal to the second reaction mixture to form the stabilized gly-oxalated polyacrylamide. If desired, an aldehyde scavenger can be included in one or more of step (1), step (2), step (3), or the sta-bilized glyoxalated polyacrylamide. Such compositions can be used to enhance the strength of paper, particularly the wet strength of paper.

La présente invention concerne des compositions comprenant un mélange d'au moins deux agents de renforcement du papier dont la stabilité est améliorée par rapport aux agents de renforcement déjà connus. Un composant est un agent de renforcement du papier polymère, de préférence un agent de renforcement à létat humide. L'autre composant est un polyacrylamide glyoxalé stabilisé préparé (1) en faisant réagir une première portion de glyoxal avec un polyacrylamide portant des groupes amido latéraux pour former un premier mélange réactionnel comprenant un polyacrylamide glyoxalé, (2) en ajoutant un acide au premier mélange réactionnel pour former un deuxième mélange réactionnel de pH réduit et comprenant le polyacrylamide glyoxalé, et (3) en ajoutant une deuxième portion de glyoxal au deuxième mélange réactionnel pour former le polyacrylamide glyoxalé stabilisé. Si on le souhaite, un agent neutralisant les aldéhydes peut être inclus dans l'une ou plusieurs des étapes (1), (2) et (3), ou dans le polyacrylamide glyoxalé stabilisé. Ces compositions permettent daméliorer la résistance du papier, en particulier la résistance du papier à létat humide.

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