Method for producing paper, paperboard and cardboard having high dry strength
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United States of America Patent
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Apr 12, 2011
Grant Date -
May 6, 2010
app pub date -
Mar 9, 2007
filing date -
Mar 16, 2006
priority date (Note) -
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Abstract
Process for the production of paper, board and cardboard having high dry strength by separate addition of a polymer comprising vinylamine units and of ligninsulfonic acid and/or a ligninsulfonate to a paper stock, draining of the paper stock and drying of the paper products.
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