Paper quality improver composition for papermaking

Details Paper quality improver composition for papermaking Paper quality improver composition for papermaking

D - Textiles, Paper

21

H

D21H 17/28 (2006.01) D21H 21/14 (2006.01) D21H 17/06 (2006.01) D21H 17/07 (2006.01) D21H 17/09 (2006.01) D21H 17/14 (2006.01) D21H 17/29 (2006.01) D21H 17/36 (2006.01) D21H 17/37 (2006.01) D21H 17/59 (2006.01) D21H 17/60 (2006.01) D21H 21/22 (2006.01) D21H 21/24 (2006.01)

Patent

CA 2329557

The present invention provides a paper quality improver composition for papermaking, which is excellent in improved efficiencies of bulky value, brightness, opacity and the like of pulp sheet, demanded at lightening paper and increasing a blending amount of deinked pulp, even by adding a small amount thereof as well as which is further excellent in an improved efficiency of paper-strength. That is, the present invention provides a paper quality improver composition for papermaking; which comprises (A) a compound having lyotropic degree measured by a specific method of not less than 4% and satisfying at least two of (i) standard improved bulky value of not less than 0.02 g/cm3, (ii) standard improved brightness of not less than 0.5 point, and (iii) standard improved opacity of not less than 0.5 point and (B) a water-soluble polymer satisfying an average molecular weight and/or a viscosity thereof of specific value.

La présente invention concerne une composition pour améliorer la qualité du papier dans la fabrication de ce dernier. Il s'agit d'un excellent moyen d'améliorer les gains sur le plan de la valeur de volume, la luminosité, l'opacité, etc. du papier pour obtenir du papier allégé et accroître une quantité de pâte désencrée, même par l'ajout d'une petite quantité de celle-ci, en plus d'améliorer l'efficacité de la force du papier. € cet effet, la présente invention prévoit une composition pour améliorer la qualité du papier pour la fabrication de ce dernier, ladite composition contenant (A) un composé dont le degré lyotropique, tel que mesuré par un procédé précis, est au moins 4 % et qui satisfait à au moins deux des conditions suivantes : (i) amélioration de la valeur de volume standard d'au moins 0,02 g/cm3, (ii) amélioration de luminosité standard d'au moins 0,5 point et (iii) amélioration de l'opacité standard d'au moins 0,5 point et (B) un polymère hydrosoluble qui satisfait à un poids moléculaire moyen et/ou une viscosité d'une valeur précise.

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