MULTI-PLY WEB OF FLEXIBLE MATERIAL, SUCH AS TISSUE PAPER OR NONWOVEN, AND PRODUCT, AND METHOD FOR IMPROVING THE BLEED FASTNESS OF A FLUORESCENT WHITENING AGENT OF A MULTI-PLY WEB
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United States of America Patent
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Issued Date -
Jan 13, 2011
app pub date -
Mar 7, 2008
filing date -
Mar 7, 2008
priority date (Note) -
Abandoned
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Abstract
A multi-ply web of flexible material, such as tissue paper or nonwoven material, includes a fluorescent whitening agent. The multi-ply web includes at least two plies being interconnected in one or more adhesive interconnection zones with an adhesive composition including polyvinyl alcohol, a polyaldehyde and an acid catalyst. The polyvinyl alcohol is cross-linked with the polyaldehyde such that the adhesive composition is water insoluble. Also described is a method for improving the bleed fastness of a fluorescent whitening agent of a multi-ply web of flexible material, which includes at least two plies being interconnected in one or more adhesive interconnection zones with an adhesive composition including polyvinyl alcohol. The method includes a step of incorporating a polyaldehyde and an acid catalyst in the adhesive composition so as to cross-link the polyvinyl alcohol with the polyaldehyde such that the adhesive composition is made water insoluble.
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