AQUEOUS SOLUTIONS OF OPTICAL BRIGHTENERS
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United States of America Patent
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app pub date -
Aug 19, 2014
filing date -
Apr 8, 2005
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Abstract
The instant invention relates to storage stable aqueous solutions of stilbene optical brighteners with polyvinyl alcohols which can be directly used by the papermaker in that they may be diluted with water and/or be metered directly into a coating composition, to provide coated papers of a particularly high whiteness.
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