Films made from polyethylene compositions and processes for making same
The present disclosure provides films made of polyethylene (PE) compositions. In at least one embodiment, a film includes a polyethylene composition, comprising: ethylene content and from 0 to 25 mol % of C 3 -C 40 olefin comonomer content, based upon the total weight of the polyethylene composition, the polyethylene composition having a total internal plus terminal unsaturation greater than 0.7 unsaturations per 1000 carbon atoms, the film having: an Elmendorf Tear value in the machine direction of from 10 g/mil to 300 g/mil, and a Dart Drop Impact of from 100 g/mil to 800 g/mil. In at least one embodiment, the present disclosure provides for processes to make a film.
1. A film comprising:
a polyethylene composition, comprising:
an ethylene content and from 0 to 25 mol % of a C 3 -C 40 olefin comonomer content, based upon the total molar content of the polyethylene composition, the polyethylene composition having a total internal plus terminal unsaturation greater than 0.7 unsaturations per 1000 carbon atoms, and further having terminal unsaturations of 50% or more of the total unsaturations,
wherein the film has:
an Elmendorf Tear value in the machine direction of from 10 g/mil to 300 g/mil, and
a Dart Drop Impact of from 100 g/mil to 1,100 g/mil.
2. The film of claim 1 , wherein the polyethylene composition has a density from 0.900 to 0.940 g/cc.
3. The film of claim 1 , wherein the polyethylene composition has a g′vis of 0.97 or greater.
4. The film of claim 1 , wherein the polyethylene composition has a g′vis of 0.99 or greater.
5. The film of claim 1 , wherein the polyethylene composition has a T 75 -T 25 greater than 20° C.
6. The film of claim 1 , wherein the polyethylene composition has a vinyl content of greater than 50% of the total unsaturation.
7. The film of claim 1 , wherein the polyethylene composition has a terminal unsaturation: internal saturation ratio of from 1 to 4.
8. The film of claim 1 , wherein the polyethylene composition has an RCI,m of from 50 to 100.
9. The film of claim 1 , wherein the polyethylene composition comprises from 6 mol % to 10 mol % of comonomer content.
10. The film of claim 1 , wherein the C 3 -C 40 olefin comonomer is hexene.
11. The film of claim 1 , wherein the polyethylene composition has an Mw/Mn value of from 6 to 9.
12. The film of claim 1 , wherein the polyethylene composition has a melt index ratio (I 21 /I 2 ) of from 20 to 40.
13. The film of claim 1 , wherein the film has one or more of the following properties:
an average of the MD and TD 1% secant modulus of from 35,000 psi to 60,000 psi;
a Dart Drop Impact of from 400 g/mil to 1,000 g/mil;
an Elmendorf Tear value in the machine direction of from 50 g/mil to 250 g/mil;
an Elmendorf Tear value in the transverse direction of from 400 g/mil to 1,000 g/mil;
a Tensile Strength in the machine direction of from 3,000 psi to 12,000 psi;
a Tensile Strength at Yield in the machine direction of from 500 psi to 3,000 psi;
a Tensile Strength at Yield in the transverse direction of from 1,000 psi to 3,000 psi; and
an Elongation at Break in the machine direction of from 200% to 600%.
14. The film of claim 1 , wherein the film has a haze of from about 7% to about 11%.
15. The film of claim 1 , wherein the film is a blown film or a cast film.
16. A process for forming the film of claim 1 , the process comprising:
extruding the polyethylene composition through a die at a die rate of from 0.3 kg/mm-hr to 2 kg/mm-hr and obtaining the film.