| 主权项 |
1. A cast film comprising greater than 70 wt %, based on the weight of the cast film, of a core layer comprising a core composition comprising:
(a) 50 to 99 wt % linear low density polyethylene based on the weight of the core composition; and (b) 1 to 50 wt % propylene-α-olefin copolymer based on the weight of the core composition, wherein the propylene-α-olefin copolymer comprises from 5 to 35 wt % of units derived from ethylene, less than or equal to 5 wt % of units derived from diene, with the balance being units derived from propylene, based on the total weight of the propylene-α-olefin copolymer, and wherein the propylene-α-olefin copolymer possesses:
(i) a melting temperature (Tm) of less than 105° C.,(ii) a heat of fusion (Hf) of less than 75 J/g,(iii) a melt flow rate of 2 to 30 dg/min, and(iv) a density of 0.850 to 0.890 g/cm3, wherein the cast film is formed by using casting techniques, and has a MD gloss measured at a 45° angle of from about 89 to about 95 and a TD gloss measured at a 45° angle of from about 89 to about 95; and wherein a 20.3 μm thick cast film comprising the core composition possesses a strain hardening value at 2000 psi (13.78 MPa) of greater than 2% greater than the strain hardening value at 2000 psi of a 20.3 μm thick cast film comprising a core layer comprising a core composition consisting of only the linear low density polyethylene. |
