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AssigneeBP Chemicals Limited
InventorsFrederic Alarcon, Christopher James Frye, David George Gilbert, Brian Leslie Turtle
Estimating the term…
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) I21/I2 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 %.
A stretch film comprising a cling additive in amount >0.5% and having
A stretch film according to either of the preceding claims having a dart impact >1100 g.
A stretch film according to any of the preceding claims having a MD elongation of >500%.
A stretch film according to any of the preceding claims wherein the cling additive is present in amount >2%.
A stretch film according to any of the preceding claims wherein the cling additive is polyisobutene (PIB).
A blown film having
Dependencies are inferred from the claim text.