D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 21/10 (2006.01) D21H 17/37 (2006.01) D21H 17/43 (2006.01) D21H 17/45 (2006.01)
Patent
CA 2333508
According to the present invention, a cross-linked polymer or copolymer formed by reverse phase emulsion polymerization from suitable water-soluble monomers or from mixtures of such monomers is used as a retention agent. The process according to the invention is characterized in that the cross-linked polymer is sheared before its introduction or injection into the suspension to be flocculated. This results in a distinct improvement in the retention, formation, drainage and other properties of the paper or paperboard sheet thus obtained, as a function of the shearing.
Selon la présente invention, on utilise comme agent de rétention un polymère ou copolymère réticulé formé par polymérisation en émulsion inverse à partir de monomères convenables solubles dans l'eau ou de mélanges de tels monomères. Le procédé selon l'invention est caractérisé par le fait que l'on cisaille le polymère réticulé avant l'introduction ou l'injection dans la suspension à floculer. On parvient à améliorer nettemant la rétention, la formation, l'égouttage, et d'autres propriétés de la feuille de papier ou carton ainsi obtenue, en fonction du cisaillement.
Hund Rene
Jehn-Rendu Christian
Heenan Blaikie Llp
S.p.c.m. Sa
Snf S.a.
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