Films and uses thereof

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 5/18 (2006.01) A61L 15/00 (2006.01) A61L 15/28 (2006.01) C08L 1/06 (2006.01)

Patent

CA 2411287

Self supporting cellulosic films having two substantially parallel and opposed surfaces made by a non-microbiological (preferably regenerative) method with a wet flatness less than about 35 seconds. Preferably average thicknesses are up to about 2 mm, and water permeabilities are at least about 100 g/m2.d. They preferably have a molecular weight cut off such that micro-organisms are substantially prevented from crossing them, (film-pore size preferably less than about 1 µm), have haze values of at least about 10%, and an average surface roughnesses of at least about 10 ml/min. The films can include particles in amounts of from about 0.5% to about 25% of the total film weight, the particles preferably being substantially on or near at least one film surface. The mean dimension of the particles along their longest axis is preferably from about 5 µm to about 5 mm. The particles are preferably cellulose fibers from a wood source. These films are useful in producing improved wound dressings.

L'invention concerne des pansements pour plaie, constitués de films cellulosiques autoporteurs comportant deux surfaces sensiblement parallèles et opposées, obtenus au moyen d'un procédé non microbiologique (de préférence régénérateur) avec un aplatissement humide inférieur à 35 secondes. Les épaisseurs moyennes sont, de préférence, de 2 mm environ, et les perméabilités à l'eau sont au moins de 100 g/m2.d. Ils possèdent un pouvoir de coupure de poids moléculaire tel que des micro-organismes ne peuvent sensiblement les traverser, (taille des pores de film de préférence inférieure à 1 µm environ), des valeurs de trouble d'au moins 10 % environ, et une rugosité moyenne de surface d'au moins 10 ml/min environ. Les films peuvent comprendre des particules en quantités comprises entre 0,5 % environ et 25 % environ en poids total du film, ces particules se trouvant, de préférence, sensiblement proches ou sur au moins une surface de film. La dimension moyenne des particules selon leur axe le plus grand est comprise entre 5 mµ environ et 5 mm environ. Ces particules sont, de préférence, des fibres de cellulose provenant d'une source de bois. Ces films sont utiles dans la production de pansements pour plaies.

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