Polyethylene films
First Claim
Patent Images
1. A stretch film comprising a cling additive in amount >
- 0.5% and having(a) dart impact of >
450 g(b) MD tear strength of >
190 g/25 μ
m(c) MD elongation at break of >
450%,said film comprising a copolymer of ethylene and an alpha-olefin having from 3 to 10 carbons atoms, said copolymer 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.
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Accused Products
Abstract
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%.
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Citations
6 Claims
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1. A stretch film comprising a cling additive in amount >
- 0.5% and having
(a) dart impact of >
450 g(b) MD tear strength of >
190 g/25 μ
m(c) MD elongation at break of >
450%,said film comprising a copolymer of ethylene and an alpha-olefin having from 3 to 10 carbons atoms, said copolymer 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.- View Dependent Claims (2, 3, 4, 5, 6)
- 0.5% and having
Specification
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Current AssigneeIneos Sales (Uk) Limited (Ineos AG)
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Original AssigneeBP Chemicals Ltd. (BP PLC)
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InventorsGilbert, David George, Alarcon, Frederic, Frye, Christopher James, Turtle, Brian Leslie
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Primary Examiner(s)Nutter, Nathan M.
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Application NumberUS10/296,830Publication NumberTime in Patent Office1,729 DaysField of Search525/191, 525/240, 525/232US Class Current525/191CPC Class CodesC08J 2323/08 Copolymers of ethene C08J23...C08J 5/18 Manufacture of films or sheetsC08L 2205/02 containing two or more poly...C08L 23/0815 Copolymers of ethene with a...C08L 23/22 Copolymers of isobutene; Bu...C08L 2666/04 Macromolecular compounds ac...
