High tear strength film

1. A film produced from a polyolefin blend that has a density from 0.935 to 0.955 g/cm 3 , said blend comprising:

(a) greater than 50 wt. % of HDPE having a density greater than 0.955 g/cm 3 and an MI 2 less than 1.0 dg/min.; and

(b) LLDPE having a density from 0.900 to 0.925 g/cm 3 and an MI 2 less than 5.0 dg/min.;

wherein the film has a thickness from 50 to 200 microns, a modulus in the machine direction (mod MD ) from about 75,000 to about 130,000 psi, a tear strength in the transverse direction (TS TD ) greater than in the machine direction (TS MD ), and a TS MD expressed in grams and measured at a film thickness of 100 microns, defined by:

TS MD >1544−(11.2)(mod MD /1000 psi).

2. The film of claim 1 wherein the LLDPE is an ethylene-hexene copolymer.

3. The film of claim 1 wherein the polyolefin blend has from about 10 to about 49 percent by weight LLDPE.

4. The film of claim 1 wherein the polyolefin blend is prepared by melt extrusion.

5. The film of claim 1 wherein the polyolefin blend has a density from 0.940 to 0.950 g/cm 3 .

6. The film of claim 1 wherein the LLDPE has an MI 2 from 0.5 to 2.0 dg/min.

7. The film of claim 1 having a thickness from 100 to 200 microns.

8. A film produced from a polyolefin blend that has a density from 0.935 to 0.955 g/cm 3 , said blend comprising:

(a) greater than 50 wt. % of HDPE having a density greater than 0.955 g/cm 3 and an MI 2 less than 1.0 dg/min.; and

(b) LLDPE having a density from 0.900 to 0.925 g/cm 3 and an MI 2 less than 5.0 dg/min.;

wherein the film has a thickness from 50 to 200 microns, and a tear strength in the machine direction (TS MD ) greater by at least 20% than that of a film with the same modulus prepared from a single polyethylene resin.