Processes of making paper and materials for use in this

D - Textiles – Paper – 21 – H

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D21H 23/14 (2006.01) C08F 2/32 (2006.01) D21H 21/10 (2006.01) D21H 17/42 (2006.01) D21H 17/44 (2006.01)

Patent

CA 2276424

Paper is made by a dual soluble polymer process in which a cellulosic suspension which usually contains alum or cationic coagulant is first flocculated with a high IV cationic synthetic polymer or cationic search and, after shearing, the suspension is reflocculated by the addition of a branched anionic water soluble polymer having IV above 3dl/g and tan delta at 0.005 Hz of at least 0.5. The process gives an improved combination of formation, retention and drainage.

On fabrique du papier au moyen d'un procédé à base de deux polymères solubles, ce qui consiste à effectuer d'abord la floculation d'une suspension cellulosique contenant habituellement de l'alun ou un coagulant cationique avec un polymère synthétique cationique présentant une viscosité intrinsèque élevée ou avec un amidon cationique et, après cisaillement, à effectuer une nouvelle floculation de la suspension avec l'apport d'un polymère ramifié anionique soluble dans l'eau présentant une viscosité intrinsèque supérieure à 3dl/g et une valeur d'oscillation rhéologique tan delta à 0,005Hz d'au moins 0,5. Ce procédé permet d'obtenir une combinaison améliorée de formation, de rétention et de drainage.

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