Breathable films and process for producing them

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 5/18 (2006.01) B32B 7/04 (2006.01) B32B 27/04 (2006.01) B32B 27/08 (2006.01) B32B 27/32 (2006.01) C08K 3/26 (2006.01) C08L 23/02 (2006.01) C08L 53/00 (2006.01)

Patent

CA 2307849

A breathable film having improved physical and barrier properties includes a stretched impact modified polyolefin matrix and a particulate filter. The impact modified polyolefin matrix includes at least one impact polypropylene copolymer, alone or in combination with other polymers. The film, and laminates including the film, provide excellent moisture breathability and excellent barrier to penetration by liquids. Laminates including the film may be used in diaper outercovers and other applications requiring breathability and resistance to penetration by liquids.

L'invention concerne une bande respirante présentant des propriétés barrière et physiques et comprenant une matrice polyoléfinique étirée et modifiée de manière à résister aux impacts, ainsi qu'une matière de charge particulaire. La matrice polyoléfinique modifiée de manière à résister aux impacts comprend au moins un copolymère de polypropylène résistant aux impacts seul ou combiné à d'autres polymères. La bande, ainsi que les stratifiés formant la bande, assure une excellente perméabilité à la vapeur d'eau et une excellente barrière contre la pénétration de liquides. Les stratifiés formant la bande peuvent être utilisés dans les couches externes d'une couche-culotte et ont d'autres applications nécessitant une respirabilité et une résistance à la pénétration de liquides.

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