D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 17/68 (2006.01) C01B 33/143 (2006.01) D21H 17/66 (2006.01) D21H 21/10 (2006.01)
Patent
CA 2481276
A method for producing paper, characterized in that it comprises adding a silica sol which is prepared by the reaction of an aqueous sodium silicate solution with a mineral acid and has, at a SiO2 concentration [C] of 15 to 50 g/L and at 25~C, a viscosity of 0.12 × [C] mPa .cndot. s or more and 15 mPa .cndot. s or less, and a cationic compound and/or amphoteric compound to a pulp slurry, followed by mixing, and subjecting the resulting mixture to a paper making process. The method allows the improvement of the yield in a paper making process.
L'invention concerne un procédé de production de papier, lequel se caractérise en ce qu'il comprend les étapes suivantes: addition d'un sol de silice obtenu par réaction d'une solution de silicate de sodium aqueuse avec un acide minéral et présentant, pour une concentration en SiO¿2? [C] de 15 à 50 g/L et à 25 ·C, une viscosité de 0,12 x [C] mPa . s ou supérieure et de 15 mPa . s ou inférieure, ainsi qu'un composé cationique et/ou amphotère à de la pâte liquide; mélange desdites substances; et utilisation du mélange obtenu pour produire du papier. Ce procédé permet d'augmenter le rendement d'un processus de fabrication de papier.
Koga Yoshiaki
Kosuga Masanori
Ogawa Masatomi
Borden Ladner Gervais Llp
Seiko Pmc Corporation
Tokuyama Corporation
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