Process of making paper

Details Process of making paper Process of making paper

D - Textiles, Paper

21

H

D21H 17/48 (2006.01) D21H 17/53 (2006.01) D21H 21/10 (2006.01) D21H 23/76 (2006.01) D21H 17/29 (2006.01) D21H 17/37 (2006.01) D21H 17/45 (2006.01) D21H 17/55 (2006.01) D21H 17/56 (2006.01) D21H 17/67 (2006.01)

Patent

CA 2159593

According to the invention, a process of making paper comprises forming a cellulosic suspension, adding retention aid to the suspension, draining the suspension through a screen to form a sheet, and drying the sheet and in this process we add to the suspension a retention system comprising polyethylene oxide and a greater amount (dry weight) of a phenolsulphone-formaldehyde resin (PSR resin) consisting essentially of recurring units of the formula -CH2-X-, wherein (a) 65 to 95 % of the groups X are di(hydroxyphenyl) sulphone groups, (b) 5 to 35 % of the groups X are selected from hydroxy phenyl sulphonic acid groups (i.e., groups which contain at least one hydroxy-substituted phenyl ring and at least onesulphonic group) and naphthalene sulphonic acid groups and (c) 0 to 10 % of the groups X are other aromatic groups.

Procédé de production de papier consistant à former une suspension cellulosique, à lui ajouter un agent de rétention, à filtrer la suspension à travers un tamis pour former une feuille, puis à sécher la feuille. On ajoute à la suspension un système de rétention comportant du poly(oxyde d'éthylène) et une quantité supérieure (en poids sec) d'une résine phénol-sulfone-formol (résine PSR) consistant essentiellement en unités récurrentes de formule -CH¿2? -X- où (a): de 65 à 95 % des groupes X sont du type di(hydroxy-phényle) sulfone, (b) 5 à 35 % des groupes X sont sélectionnés parmi des groupes d'acide hydroxy-phényle sulfonique (c'est à dire, des groupes contenant au moins un cycle phényle à substitution hydroxy et au moins un groupe sulfonique) et des groupes d'acide naphtalène sulfonique, et (c) 0 à 10 % des groupes X sont d'autres groupes aromatiques.

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