Composition suitable for single-sided, low-noise, stretch cling film and films made therefrom
The invention is directed to a composition suitable for use in a single-sided stretch cling film, the composition having from 0.1 to 20 percent by weight of a propylene-based copolymer having substantially isotactic propylene sequences, and having from 80 to 99 percent by weight of an ethylene-based copolymer having a density of at least 0.905 g/cc, wherein a film made from the composition exhibits cling layer to release layer cling of at least 70 grams force per inch as measured by ASTM D-5458-95, noise levels of less than 87 dB during unwinding operations, and has a modulus of at least 3 MPA as determined by ASTM D-882.
1. A single-sided stretch film, the film comprising:
A. a cling layer comprising (1) from 0.1 to 20% by weight of a propylene-based copolymer having substantially isotactic propylene sequences, the propylene-based copolymer comprising propylene and from about 10 to about 33 mole % of units derived from an alpha olefin, the propylene-based copolymer having a melt flow rate less than 50 g/10 min; and (2) from about 80 to about 99% by weight of a ethylene-based copolymer having a density of at least 0.905 g/cc; and
B. a release layer comprising a polyethylene having a density of at least 0.905 g/cc, wherein the film exhibits a cling layer to release layer cling of at least 70 grams force per inch as measured by ASTM D-5458-95, noise levels of less than 87 dB during unwinding operations, and has a modulus of at least 3 MPA as determined by ASTM D 882.
2. The single-sided stretch cling film of claim 1 , wherein the release layer (B) comprises a polyethylene having a density of at least 0.917 g/cc.
3. The single-sided stretch cling film of claim 1 , wherein the film exhibits a cling of at least 100 grams force per inch, a noise level of less than 80 dB, and has a modulus of at least 6 MPa.
4. The single-sided stretch cling film of claim 3 , wherein the cling layer (A) comprises from 4 to 12 percent by weight of a propylene-ethylene copolymer having from 10 to 17 percent by weight units derived from ethylene and a melt flow rate of less than 25 g/10 min.
5. The single-sided stretch cling film of claim 4 , wherein the film exhibits a cling of at least 150 grams force per inch, and has a modulus of at least 7 MPa.
6. The single-sided stretch cling film of claim 5 , wherein the ethylene-based copolymer of the cling layer comprises an ethylene/1-octene copolymer.
7. The single-sided stretch cling film of claim 6 , wherein the ethylene/1-octene copolymer has a density of at least about 0.917 g/cc.
8. The single-sided stretch cling film of claim 7 , wherein the ethylene/1-octene copolymer has a melt index of from about 2 to about 12 g/10 min.
9. The single-sided stretch cling film of claim 1 , wherein the release layer further comprises from 0.1 to 2 percent by weight of a propylene-based copolymer.
10. The single-sided stretch cling film of claim 9 , wherein the propylene-based copolymer comprises a propylene-ethylene copolymer.
11. The single-sided stretch cling film of claim 9 , wherein the coefficient of friction of the release layer to itself is less than 1.0.
12. The single-sided stretch cling film of claim 11 , wherein the coefficient of friction of the release layer to itself is from 0.15 to 0.7.
13. The single-sided stretch cling film of claim 9 , wherein the cling of the release layer to itself is less than 60 grams-force/inch.