Paper-making method and a combination of ingredients to be used in it
AssigneeKemira Oy
InventorsOlli J. Jokinen, Lars Petander, Pirkko J. Virta
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Abstract
In a paper-making method cellulose is suspended in water and the obtained pulp suspension is dewatered in order to form a fiber web or a fiber sheet, water being removed from a pulp suspension which contains an organic polymer and an inorganic oligomeric Ti, Zr, Sn or B compound.
Claims1
In the method of making paper from a suspension of cellulose pulp and a filler in water, wherein water is removed from said pulp suspension and a web or a sheet is formed, the improvement which consists of increasing the filler retention and overall retention by removing water from said pulp suspension in the presence of a retention aid which consists of a cationic starch and an inorganic oligomeric Ti.sup.+4 compound from titanyl sulfate in the amount of 0.1-15% calculated on the basis of the dry weight of the pulp, at a pH of 4-8 wherein said cationic starch and said inorganic oligomeric Ti.sup.+4 compound are present in a weight ratio of 0.2-20:1.
Dependencies are inferred from the claim text.