Sizing composition and a method of sizing
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United States of America Patent
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Aug 20, 2002
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N/A
app pub date -
Oct 13, 2000
filing date -
Apr 14, 1998
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Expired
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Abstract
A sizing composition and a method of sizing a cellulosic fiber material are disclosed. The sizing composition comprises an aqueous dispersion of a rosin material and a polyaluminium compound, and is characterised in that the polyaluminium compound is a polyaluminium phosphate sulphate compound. The polyaluminium phosphate sulphate compound should comprise at least 5% by weight, calculated as aluminium on the amount of rosin material in the composition. It is preferred that the sizing composition also comprises a synthetic sizing agent in addition to the rosin material. The dispersion preferably also includes a dispersing agent and has a dry content of at least 1% by weight. The sizing composition is used for the sizing of cellulosic fibre materials, such as paper, board or paper board by adding 0.01-5% by weight, calculated as dry sizing agent on dry cellulose fibers, of the sizing composition to the cellulosic fiber material, preferably to a cellulose stock for internal sizing of the cellulosic fiber material.
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