Elastic articles having improved unload power and a process...

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 210/16 (2006.01) C08F 210/18 (2006.01) C08J 5/18 (2006.01)

Patent

CA 2130192

Disclosed is a process for producing an elastic film of improved unload power which comprises producing a precursor film comprising an elastomer of ethylene copolymerized with a C3 to C20 alpha-olefin comonomer and/or a C3 to C20 polyene comonomer, the elastomer having a density of from 0.855 g/cm3 to 0.900 g/cm3, a melt index of from 0.2 to 1000 dg/min, a molecular weight distribution in the range of about 1.5 to 30, and a Composition Distribution Breadth Index (CDBI) of at least 45 percent; orienting the film to a draw ratio in the range of from 2:1 to 20:1; and annealing the oriented film at a temperature between the softening point and melting point of the elastomer. Further disclosed is an elastic film oriented to a draw ratio of from 2:1 to 20:1 and comprising a copolymer of ethylene polymerized with at least one comonomer selected from the group consisting of C3 to C20 alpha-olefins and C3 to C20 polyenes, the copolymer having a density in the range of 0.855 to 0.900 g/cm3, a melt index in the range of 0.2 to 100, with a composition distribution index of at least 45 percent.

Méthode pour obtenir une pellicule élastique, à puissance de décharge améliorée, consistant à produire une pellicule précurseur constituée d'un élastomère d'éthylène, copolymérisé avec un comonomère alpha-oléfinique C3 à C20 et (ou) un comonomère polyénique C3 à C20; l'élastomère a une masse spécifique de 0,855 g/cm3 à 0,900 g/cm3, un indice de fusion de 0,2 à 1000 dg/min, une distribution de masse molaire d'environ 1,5 à 30 et un CDBI (Composition Distribution Breadth Index) d'au moins 45 pour cent; à orienter la pellicule selon un rapport d'étirage de l'ordre de 2:1 à 20:1; à recuire la pellicule à une température entre le point de ramollissement et le point de fusion de l'élastomère. Pellicule élastique orientée selon un rapport d'étirage de 2:1 à 20:1 et comprenant un copolymère d'éthylène polymérisé avec au moins un comonomère choisi parmi des alpha-oléfines C3 à C20 et des polyènes C3 à C20; les copolymères ont une masse spécifique de 0,855 à 0,900 g/cm3, un indice de fusion de 0,2 à 100, avec un indice de distribution de la composition d'au moins 45 pour cent.

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