Alkanolammonium-containing triazinyl flavonate whiteners
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United States of America Patent
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Oct 27, 2009
Grant Date -
Mar 30, 2006
app pub date -
Jul 22, 2005
filing date -
Aug 6, 2004
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Abstract
A process for whitening paper in a size press includes contacting a cellulose sheet with a size press liquor that contains a surface size and a particular whitener containing sulfonate groups and cations, M, wherein at least 10% of all cations M have the formula-hydroxyalkyl radical. The process provides superior paper whitening compared to a corresponding process in which the whitener cations are all sodium or potassium ions.
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