Dry strength composition, its use and method for making of paper, board or the like
AssigneeKemira Oyj
InventorsMatti Hietaniemi, Asko Karppi, Jonas Konn
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Abstract
A dry strength composition for manufacture of paper, board or the like is disclosed. The dry strength composition includes, as a mixture, at least one anionically derivatized polysaccharide, and cationic starch having an amylopectin content ≥80 weight-%. The anionically derivatized polysaccharide and the cationic starch provide the composition with a charge density in a range of 0.1-1.5 meq/g, when measured at pH 2.8, and −0.1-−3 meq/g, preferably −0.3-−2.5 meq/g, more preferably −0.5-−2.0 meq/g, when measured as an aqueous solution, at pH 7.0. Further disclosed are a use of the composition and a method for manufacturing paper, board or the like.
Claims6
A dry strength composition for manufacture of paper, board, which comprises, as a mixture:
- at least one anionically derivatized polysaccharide, comprising carboxymethylated cellulose having a viscosity in a range of 100-30 000 mPas, measured from a 2 weight-% aqueous solution at 25° C., by using a Brookfield LV DV1, and
- cationic starch having an amylopectin content ≥80 weight-%, wherein the anionically derivatized polysaccharide and the cationic starch provide the composition with a charge density in a range of:
- 0.1-1.5 meq/g, when measured at pH 2.8, and
- 0.1-3 meq/g, when measured as an aqueous solution, at pH 7.0.
Dependencies are inferred from the claim text.