C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
C08J 5/18 (2006.01) A61F 13/15 (2006.01) A61L 15/00 (2006.01) A61L 15/18 (2006.01) B29C 55/00 (2006.01) B29C 55/18 (2006.01) B29C 67/20 (2006.01) C08J 9/00 (2006.01) C08K 3/26 (2006.01) C08L 23/08 (2006.01)
Patent
CA 2338681
A breathable microporous film having improved extensibility is disclosed. The microporous breathable film is formed from a mixture of a thermoplastic polymer and particles of an inorganic filler, and is provided with breathability by stretching it in at least one direction. The microporous film is provided with a better extensibility by selecting the particle size of the inorganic filler, and the moisture content of the particles of inorganic filler and of the thermoplastic polymer when they are blended together to provide the mixture, and by controlling the Dart Resistance of the film. A composite layered breathable structure comprising the microporous film is also disclosed, and moreover a disposable absorbent article comprising a microporous breathable film which is imparted extensibility by means of mechanical straining.
L'invention porte sur un film micro-poreux respirant à extensibilité améliorée fait d'un mélange d'un polymère thermoplastique et d'une charge de particules minérales, et dont la respirabilité est obtenue par étirage dans au moins une direction. Sa faculté d'extension dépend de la sélection de la taille des particules, de la teneur en humidité des particules et du polymère lors de leur mélange, et du contrôle de la résistance du film au mouton. L'invention porte également sur une structure composite stratifiée faite dudit film dont l'extensibilité est accrue par étirage mécanique.
Bonelli Guido
Cimini Carmine
Veglio Paolo
Sim & Mcburney
The Procter & Gamble Company
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