Heterogeneous ethylene alpha-olefin interpolymers
An interpolymer of ethylene and at least one alpha-olefin is claimed, wherein the ethylene interpolymer is characterized as having an average M v and a valley temperature between the interpolymer and high crystalline fraction, T hc , such that the average M v for a fraction above T hc from ATREF divided by average M v of the whole polymer from ATREF (M hc /M p ) is less then about 1.95 and wherein the interpolymer has a CDBI of less than 60%. The interpolymer of ethylene and at least one alpha-olefin can also be characterized as having a high density (HD) fraction and an overall density such that % HD fraction<−2733.3+2988.7x+144111.5 (x−0.92325) 2 where x is the density in grams/cubic centimeter. Fabricated articles comprising the novel interpolymers are also disclosed.
1. An interpolymer of ethylene and at least one alpha-olefin prepared in a single reactor in the presence of a multi-constituent catalyst system, wherein the interpolymer is heterogeneously branched polymer produced in the single reactor and wherein the interpolymer displays only two peaks and one valley from 30° C. to 120° C. in ATREF and has an average M v and a valley temperature between the interpolymer and high crystalline fraction, T hc , such that the average M v for a fraction above T hc from ATREF divided by average M v of the whole polymer from ATREF (M hc /M p ) is less than 1.7 and wherein the interpolymer has a CDBI of less than 48%.
2. The interpolymer of claim 1 wherein said interpolymer has a CDBI of less than 45%.
3. Film comprising the interpolymer of claim 1 .
4. The film of claim 3 comprising a Dart A of at least 550 gm.
5. The film of claim 3 comprising haze of <10%.
6. The film of claim 3 comprising 45 degree gloss >75 units.
7. The film of claim 3 comprising Normalized MD Tear >400 gm/mil.
8. The interpolymer of claim 1 further comprising at least one other natural or synthetic polymer.
9. The interpolymer of claim 8 where the synthetic polymer is low density polyethylene.
10. The interpolymer of claim 1 comprising a melt index from about 0.1 to about 10 g/10 min.
11. The interpolymer of claim 1 comprising an overall density from about 0.9 to about 0.935 g/cm 3 .
12. The interpolymer of claim 1 comprising long chain branches less than 1 per 1000 C atoms.
13. The interpolymer of claim 1 comprising a molecular weight distribution, M w /M n , of less than about 5.
14. A fabricated article comprising the interpolymer of claim 1 .
15. The interpolymer of claim 1 , wherein the interpolymer has been at least partially cross-linked to at least 5%, by weight, gel.
16. A process to make the interpolymer of claim 1 , comprising the steps of contacting ethylene with at least one alpha-olefin under polymerization conditions of temperature and pressure with a catalyst composition to form an ethylene/alpha-olefin interpolymer, wherein the polymerization conditions comprise a catalyst metal and aluminum, and wherein the molar ratio of aluminum to catalyst metal atom is from about 1:1 to about 5:1, the process further comprising recovering the ethylene/alpha-olefin interpolymer.