B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 5/28 (2006.01) B32B 27/32 (2006.01) C08J 5/18 (2006.01) C08L 23/06 (2006.01)
Patent
CA 2306464
Polyethylene films having desired water vapor transmission rates (WVTR) and methods of producing the same are provided. The methods include adherently superimposing at least one layer of a WVTR-controlling material to a base layer including a polyethylene and a cavitating agent, and subsequently biaxially orienting the composite polyethylene sheet to yield a film having the desired WVTR. The base layer has a porous microstructure and a WVTR substantially higher than the desired WVTR.
L'invention concerne des films en polyéthylène possédant un taux désiré de transmission de la vapeur d'eau ainsi que des procédés correspondants. Ces procédés consistent, premièrement, à superposer et à coller au moins une couche de matériau régulant le taux de transmission de la vapeur d'eau sur une couche de base qui comprend du polyéthylène et un agent cavitant et, deuxièmement, à orienter sur deux axes la feuille en polyéthylène composite afin d'obtenir un film possédant un taux désiré de transmission de la vapeur d'eau. La couche de base a une microstructure poreuse et un taux de transmission de la vapeur d'eau sensiblement plus élevé que le taux de transmission désiré.
Agent Rhonda Rogers
Pip Hans Joachim
Borden Ladner Gervais Llp
Mobil Oil Corporation
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