Some content of this application is unavailable at the moment.
If this situation persist, please contact us atFeedback&Contact
1. (WO2017039986) MULTILAYER FILMS AND METHODS THEREOF
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

We claim:

1. A multilayer film comprising a cling layer and a release layer, wherein:

the cling layer comprises:

(i) an ethylene/alpha-olefin elastomer having a density in the range of 0.855 to 0.890 grams/cm3 and a melt index, h, in the range of 0.1 to 30 grams/10 minutes; and

(ii) a polyethylene polymer selected from ultra-low density polyethylene, a very low density polyethylene, or combinations thereof, wherein the polyethylene polymer has a density in the range 0.885 to 0.915 grams/cm3, a melt index, h, in the range of 0.1 to 30 grams/10 minutes, and a purge fraction greater than 20 percent as determined by the Crystallization Elution Fractionation (CEF) test method; and

the release layer comprises a low density polyethylene (LDPE) having a density of from 0.915 to 0.930 g/cc, a melt index, I2, of from 1.0 to 30.0 g/10 min, and a molecular weight distribution, Mw/Mn, as measured by the conventional calibration of triple detector gel permeation chromatography, of from 3.0 to less than 7.0.

2. The film of claim 1, wherein the release layer comprises from 85 wt.% to 100 wt.% of the LDPE.

3. The film of claim 1, wherein the low density polyethylene has a number average molecular weight, as measured by the conventional calibration of TDGPC, of 10,000 to 20,000 g/mol.

4. The film of claim 1, wherein the low density polyethylene has a Mw(abs)/Mn(conv), as measured by TDGPC, of 1.5 to 2.1.

5. The film of claim 1, wherein the low density polyethylene has a gpcBR, as measured by TDGPC, of 1.0 to 1.9.

5. The film of claim 1, wherein the low density polyethylene has a viscosity ratio (viscosity at 0.1 rad/s divided by the viscosity at 100 rad/s, both measured at 190°C using dynamic mechanical spectroscopy) of from 7 to 15.

7. The film of claim 1, wherein the low density polyethylene has a tan delta at 0.1 rad/s, as measured at 190°C using dynamic mechanical spectroscopy of 4.5 to 10.

8. The film of claim 1, wherein the release layer further comprises a linear low density polyethylene.

9. The film of claim 1, wherein the cling layer comprises from 20 wt.% to 100 wt.% of the ethylene/alpha-olefin elastomer.

10. The film of claim 1, wherein the film further comprises a core layer positioned between the cling layer and the release layer.

11. The film of claim 1, wherein the cling layer has a thickness that is from 10-30 percent of the overall thickness of the film.

12. The film of claim 1, wherein the release layer has a thickness that is from 10-30 percent of the overall thickness of the film.

13. The film of claim 1, wherein the film exhibits a cling value of greater than 200 g when the release layer comprises 100 wt.% LDPE.

14. The film of claim 8, wherein the film exhibits a noise level of less than 90 dB when the release layer comprises 100 wt.% LDPE.

15. A method of making the multilayer film according to any one of the previous claims, wherein the method comprises:

coextruding the cling layer composition with the release layer composition in an extruder to form a tube having a cling layer and a release layer; and

cooling the tube to form a multilayer blown stretch film.