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US 6,306,255 B1Granted
Sizing of paper
AssigneeAkzo Nobel N.V.
InventorsSten Frölich, Erik Lindgren, Rein Sikkar
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AssigneeAkzo Nobel N.V.
InventorsSten Frölich, Erik Lindgren, Rein Sikkar
Estimating the term…
The invention relates to an aqueous disperion containing a cellulose-reactive sizing agent and an anionic hydrophobicailly modified cellulose-derivative, its preparation and use in the production of paper. The invention also relates to a substantially water-free composition containing a cellulose-reactive sizing agent and an anionic hydrophobicailly modified cellulose-derivative, its preparation and use in the preparation of an aqueous dispersion of cellulose-reactive sizing agent. The invention further relates to a process for sizing cellulosic fibers by addition of an aqueous sizing dispersion containing a cellulose-reactive sizing agent and a hydroically modified dispersing agent to a stock containing cellulosic fibers, and optional fillers, and dewatering the stock on a wire to obtain a web containing cellulosic fibers.
A process for sizing cellulosic fibers which comprises adding an aqueous sizing dispersion containing a cellulose reactive sizing agent and a hydrophobically modified dispersing agent to a stock containing cellulosic fibers, and optional fillers, dewatering the stock on a wire to obtain a web containing cellulosic fibers, wherein the stock has a cationic demand of at least 50 μeq/litre stock filtrate and the hydrophobically modified dispersing agent is an anionic hydrophobically modified cellulose-derivative.
Dependencies are inferred from the claim text.