C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
C08J 5/18 (2006.01) B32B 5/22 (2006.01) B32B 27/12 (2006.01) B32B 27/20 (2006.01) C08K 3/26 (2006.01) C08K 5/13 (2006.01) C08K 5/1545 (2006.01) C08K 13/02 (2006.01)
Patent
CA 2284596
A breathable microporous film is prepared by extruding a film comprising about 30 to 70 % by weight of a thermoplastic polymer, about 30 to 70 % by weight of filler particles having an average particle size less than about 10 microns and about 100 to 1000 PPM of a mono-functional hindered phenol, such as .alpha.-tocopherol, and then sufficiently stretching the filled film in at least one direction thereby creating a fine pore network therein and a water vapor transmission rate in excess of 300 g/m2/24 hours.
Ce film microporeux imper-respirant est préparé par extrusion d'un film comprenant environ 30 à 70 % en poids d'un polymère thermoplastique, environ 30 à 70 % en poids de particules de charge, d'une taille particulaire moyenne inférieure à environ 10 microns, et environ 100 à 1000 mg/l d'un phénol mono-fonctionnel empêché, un alpha -tocophérol par exemple, puis par étirement du film garni et ce, dans au moins une direction, ce qui donne lieu à la constitution d'un réseau à pores fins et se solde par une transmission de la vapeur d'eau dépassant 300 g/m<2> par 24 heures.
Jacobs Robin Lee
Stopper Steven Ray
Borden Ladner Gervais Llp
Kimberly-Clark Worldwide Inc.
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