Interpolymer compositions and cast stretch film therefrom

Details Interpolymer compositions and cast stretch film therefrom Interpolymer compositions and cast stretch film therefrom

C - Chemistry, Metallurgy

08

L

C08L 23/08 (2006.01) B32B 27/32 (2006.01)

Patent

CA 2274746

This invention relates to cast films prepared from interpolymer compositions comprising: (A) a substantially linear ethylene/.alpha.-olefin interpolymer present in the composition in an amount of from 10 to 100 % by weight based on the combined weight of Components A and B; and (B) a heterogeneous interpolymer present in the composition in an amount of from 0 to 90 % by weight based on the combined weight of Components A and B; and wherein said interpolymer composition has an I10/I2 value of < 10.0 and is characterized as having a viscosity at 100 rad/s and a relaxation time (.tau.) which satisfies either of the following relationships: Log(viscosity at 100 rad/s)<=4.43-0.8 log(I2) or log(.tau.) > -1.2-1.3* log(I2). The interpolymer compositions are useful in cast stretch film manufacture with the resulting cast films having an excellent balance of strength and processability.

L'invention concerne des films coulés produits à partir de compositions interpolymères comprenant: (A) un interpolymère d' alpha -oléfine/éthylène sensiblement linéaire, à raison de 10 à 100 % en poids en fonction du poids combiné des composants A et B; et (B) un interpolymère hétérogène, à raison de 0 à 90 % en poids en fonction du poids combiné des composants A et B; ladite composition interpolymère a une valeur I10/I2 de moins de 10,0 et se caractérise par une viscosité à 100 rad/s et un temps de relaxation ( tau ) remplissant une des relations suivantes: Log (viscosité à 100 rad/s)</=4,43-0,8 log(I2) ou log( tau )<-1,2-1,3* log(I2). Lesdites compositions interpolymères sont utiles dans la fabrication de films étirables coulés présentant un excellent équilibre entre la résistance et transformabilité.

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