Paper products having wet strength from...

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 11/20 (2006.01) D21C 9/00 (2006.01) D21H 17/24 (2006.01) D21H 17/31 (2006.01) D21H 21/20 (2006.01)

Patent

CA 2250175

Paper products having high initial wet strengths are disclosed. The paper products comprise cellulosic fibers having free aldehyde groups, which fibers are combined with a water-soluble polymer having functional groups that are reacted with the aldehyde groups to form bonds joining the fibers. In a preferred embodiment, the cellulosic fibers contain a polysaccharide in which the hydroxyl groups of at lease a portion of the repeating units of the polysaccharide are cis-hydroxyl groups, preferred repeating units being mannose and/or galactose, Similarly, the water-soluble polymer is preferably a polysaccharide in which the hydroxyl groups of at least a portion of the repeating units of the polysaccharide are cis-hydroxyl groups. Preferred polysaccharides are derived from one or more sugars selected from mannose, galactose, allose, altrose, gulose, talose and lyxose.

On décrit des produits du type papier ayant des résistances initiales élevées à l'état humide. Ces produits du type papier renferment des fibres cellulosiques comprenant des groupes aldéhyde libres, lesdites fibres étant combinées à un polymère soluble dans l'eau comprenant des groupes fonctionnels qui réagissent avec les groupes aldhéhyde pour former des liaisons qui relient les fibres. Dans une forme de réalisation préférée, les fibres cellulosiques contiennent un polysaccharide dans lequel les groupes hydroxyle d'au moins une partie des unités récurrentes du polysaccharide sont des groupes cis-hydroxyle, les unités récurrentes préférées étant du mannose et/ou du galactose. Le polymère soluble dans l'eau est de préférence lui aussi un polysaccharide dans lequel les groupes hydroxyle d'au moins une partie des unités récurrentes du polysaccharide sont des groupes cis-hydroxyle. Les polysaccharides préférés sont dérivés d'un ou de plusieurs sucres sélectionnés parmi le mannose, le galactose, l'allose, l'altrose, le gulose, le talose et le lyxose.

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