Absorbent sheet exhibiting resistance to moisture penetration

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 21/16 (2006.01) B32B 29/06 (2006.01) D21H 17/60 (2006.01) D21H 19/18 (2006.01) D21H 25/06 (2006.01) D21H 27/30 (2006.01)

Patent

CA 2505595

An absorbent paper sheet is treated with an aqueous wax dispersion such that the sheet includes a fused wax and emulsifier residue in an amount of from about 1 to about 20 weight percent of the sheet based on the combined weight of the fiber, wax residue and an emulsifier residue in the sheet. The fused wax emulsion operates to make at least one surface of the sheet laterally hydrophobic, exhibiting a moisture penetration delay of at least about 2 seconds and less than about 40 seconds as well as a typical contact angle with water at one minute of at least about 50 degrees. There is thus provided absorbent products which exhibit both absorbency and resistance to moisture penetration. The treated sheet further exhibits microbial barrier properties, impeding transfer of bacteria, for example, through the sheet. There are produced tissue products which resist moisture penetration from propelled liquids as well as sequester sorbed liquids in the interior of the tissue.

Cette invention concerne une feuille de papier absorbant traitée avec un dispersion de cire aqueuse, qui comprend une cire noyée dans la masse et un résidu d'émulsionneur à raison de 1 à 20 % en poids de la feuille (poids combiné de la fibre, du résidu de cire et du résidu d'émulsionneur). L'émulsion de cire noyée dans la masse a pour effet de rendre au moins une surface latérale de la feuille sensiblement hydrophobe, avec une latence de pénétration de l'eau comprise entre moins deux secondes environ et moins de 40 secondes selon un angle de contact type approximatif d'au moins 50 ·. Il est ainsi possible de réaliser des produits à la fois absorbants et résistants à la pénétration de l'eau. La feuille présente des propriétés d'arrêt microbien, ce e qui empêche par exemple le transfert de bactéries à travers ladite feuille. Les produits en ouate cellulosique ainsi fabriqués résistent à la pénétration d'eau par projection ainsi qu'aux liquides absorbés et retenus à l'intérieur de la ouate cellulosique.

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