Claims
- 1. A process for producing a film, the process comprising the steps of:a) blowing a composition on a film line extruder to produce a film, wherein said composition comprises a polyethylene homopolymer comprising a density greater than about 0.955 g/cc, and a rheological breadth parameter of greater than about 0.22, wherein said film comprises a water vapor transmission rate of less than about 0.60 g mil/100 in2/day, and wherein said extruder is configured with a neck height of no less than about 15 inches; and wherein the water vapor transmission rate decreases as the processing neck height is increased.
- 2. The process of claim 1 wherein the neck height is about 15 inches.
- 3. The process of claim 1 wherein the neck height is about 30 inches.
- 4. The process of claim 1 wherein the neck height is about 40 inches.
- 5. The process of claim 1 wherein said polyethylene homopolymer further comprises a molecular weight distribution of less than about 7.0.
- 6. The process of claim 5 wherein said film is a monolayer film having a thickness of up to about 5.0 mil.
- 7. The process of claim 6 wherein said film comprises a haze value less than about 50%.
- 8. The process of claim 7 wherein said film comprises a gloss value of greater than about 5%.
- 9. The process of claim 1 wherein the composition comprises at least a second type of polymer, and wherein the film is a coextruded blown film.
- 10. The process of claim 7 wherein the haze value decreases with decreased processing neck height.
- 11. The process of claim 8 wherein the gloss value decreases with increased processing neck height.
REFERENCE TO RELATED APPLICATION
This application claims the benefit of U.S. Provisional Application Serial No. 60/215,862, entitled “High Density Polyethylene Resin for Blown Film”, filed Jul. 1, 2000.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
5710224 |
Alt et al. |
Jan 1998 |
A |
6110549 |
Hamada et al. |
Aug 2000 |
A |
Foreign Referenced Citations (3)
Number |
Date |
Country |
0729978 |
Sep 1996 |
EP |
WO 9619527 |
Jun 1996 |
WO |
WO 9814491 |
Apr 1998 |
WO |
Provisional Applications (1)
|
Number |
Date |
Country |
|
60/215862 |
Jul 2000 |
US |