Modified cellulosic fibers and fibrous webs containing these...

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 11/20 (2006.01) D21C 9/00 (2006.01)

Patent

CA 2293318

Disclosed are modified cellulosic fibers having a dry zero span tensile index that is substantially less than the dry zero span tensile index of the corresponding unmodified cellulosic fibers. Fibers having reduced dry zero span tensile may provide fibrous structures having improved hand feel compared with fibers prepared from unmodified fibers. In particular, such modified fibers provide fibrous structures with improved flexibility, which is perceived as improved softness. The reduced dry zero span tensile is preferably achieved by reacting the fibers with one or more cellulase enzymes and one or more debonders. The invention also relates to a fibrous structure having a density of not more than about 0.4 g/cc, wherein the fibrous structure comprises modified cellulosic fibers having a dry zero span tensile index that is at least about 15 % less than the dry zero span tensile index of the corresponding unmodified cellulosic fibers; and wherein the fibrous structure has a bending modulus per unit dry tensile that is at least about 30 % less than the bending modulus per unit dry tensile of a fibrous structure prepared from corresponding unmodified fibers.

L'invention concerne des fibres cellulosiques modifiées ayant un indice de traction à serrage nul à sec sensiblement inférieur à celui des fibres cellulosiques non modifiées correspondantes. Des fibres ayant un indice de traction à serrage nul à sec peuvent donner des structures fibreuses améliorées présentant un toucher amélioré par comparaison avec des fibres obtenues à partir de fibres non modifiées. En particulier, ces fibres modifiées donnent des structures fibreuses plus souples se traduisant par une sensation de douceur améliorée. La diminution de l'indice de traction à serrage nul à sec est, de préférence, obtenue par réaction des fibres avec une ou plusieurs enzymes cellulases et un ou plusieurs agents de désolidarisation. L'invention concerne en outre une structure fibreuse qui présente une densité d'au plus 0,4 g/cc et comprend des fibres cellulosiques modifiées ayant un indice de traction à serrage nul à sec inférieur d'environ 15 % à celui des fibres cellulosiques non modifiées correspondantes. Cette structure fibreuse présente enfin un module de courbure par unité d'allongement à sec inférieur d'au moins environ 30 % au module de courbure par unité d'allongement à sec d'une structure fibreuse obtenue à partir de fibres non modifiées correspondantes.

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