BENTONITE FOR BINDING IMPURITIES DURING PAPER PRODUCTION
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United States of America Patent
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Issued Date -
Feb 19, 2009
app pub date -
Nov 30, 2005
filing date -
Dec 16, 2004
priority date (Note) -
Abandoned
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Abstract
A method for binding impurities in paper production, comprising the following steps:a) provision of a bentonite, the proportion of the monovalent cations, based on the cation exchange capacity (CEC) of the bentonite, being at least 0.7 and the CEC being more than 85 meq/100 g, preferably more than 90 meq/100 g, in particular more than 95 meq/100 g;b) addition of the bentonite according to a) to a paper pulp or fiber suspension;c) binding of the impurities to the bentonite in the pulp or fiber suspensionis described.
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