Low formaldehyde and high wet strength vinyl acetate ethylene copolymer and vinyl acetate polymer dispersions
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United States of America Patent
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May 17, 2016
Grant Date -
Jun 13, 2013
app pub date -
Dec 7, 2011
filing date -
Dec 7, 2011
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Abstract
An aqueous composition includes polyvinyl alcohol, an acid having a pKa of at most 4.0, and a dispersion of a polymer in which vinyl acetate units constitute at least 60 wt % of the polymer. The polymer does not contain units of any N-methylol-containing monomer, and at least a portion of the polyvinyl alcohol is present in the form of an emulsion stabilizer for the polymer. The wet strength of a fibrous nonwoven substrate can be increased by applying one or more aqueous compositions that together include polyvinyl alcohol, an acid having a pKa of at most 4.0, and a dispersion of a polymer as described above, followed by a final drying step. A fibrous nonwoven article can be prepared in this way.
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