Novel polyethylene films
Novel stretch and blown films are prepared based on copolymers of ethylene and alpha-olefins having (a) a density in the range 0.900 to 0.940 (b) an apparent Mw/Mn of 2-3.4 (c) I 21 /I 2 from 16 to 24 (d) activation energy of flow from 28 to 45 kJ/mol (e) a ratio Ea(HMW)/Ea(LMW) >1.1, and (f) a ratio g′(HMW)/g′(LMW) from 0.85 to 0.95. The films exhibit an excellent combination of strength and processability and are particularly suitable for use as either stretch films or blown films for use as heavy duty sacks. The preferred films show a dart impact of >1100 g and MD elongations of >500%.
1 - 6 . (canceled)
7 . A blown film having
(a) dart impact of >450 g,
(b) MD tear strength >190 g/25 μm, and
(c) MD elongation >450%
said film comprising a copolymer of ethylene and an alpha-olefin having from 3 to 10 carbon atoms, said copolymer having
(a) a density >0.920,
(b) an apparent Mw/Mn of 2-3.4,
(C) I 21 /I 2 from 16 to 24,
(d) activation energy of flow from 28 to 45 kJ/mol,
(e) a ratio Ea(HMW)/Ea(LMW) >1.1, and
(h) a ratio g′(HMW)/g′(LMW) from 0.85 to 0.95.
8 . A blown film according to claim 7 having a dart impact >600 g.
9 . A blown film according to claim 8 having a dart impact >1100 g.
10 . A blown film according to 7 having a MD elongation of >500 g.