Polymer composition for caps and closures
AssigneeIneos Europe AG
InventorsBenoit Koch, Christophe Moineau
Life of this patent
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Abstract
Polyethylene composition having a density of 950-960 kg/m3, a SHI(1,100) of 4-12, a melt index MI2 between 0.2 and 2 g/10 min, and a relationship between spiral flow ‘SF’ (measured in mm at 250° C./1000 bar/100 mm/s) and ESCR ‘E’ (measured in hours) of E>200−SF. The composition contains 48-62 wt % of an ethylene polymer (A) and 38-52 wt % of an ethylene copolymer (B). Copolymer (B) has a higher weight average molecular weight than polymer (A), and both of fractions (A) and (B) have a reverse comonomer distribution such that comonomer content increases with increasing molecular weight in the individual fraction.
Claims27
Polyethylene composition having a density of 950-960 kg/m3, a SHI(1,100) of 4-12, a melt index MI2 between 0.2 and 2 g/10 min, and a relationship between spiral flow ‘SF’ (measured in mm at 250° C./1000 bar/100 mm/s) and ESCR ‘E’ (measured in hours) of E>200−SF, wherein the composition comprises 48-62 wt % of an ethylene polymer (A) and 38-52 wt % of an ethylene copolymer (B), copolymer (B) having a higher weight average molecular weight than copolymer (A), and both of fractions (A) and (B) have a reverse comonomer distribution such that comonomer content increases with increasing molecular weight in the individual fraction.
Polyethylene composition having a density of 950-960 kg/m3, of SHI(1,100) of 4-12, a melt index MI2 between 0.2 and 2 g/10 min, and a relationship between spiral flow ‘SF’ (measured in mm at 250° C./1000 bar/100 mm/s), ESCR ‘E’ (measured in hours) and melt index ‘MI2’ (measured in g/10 min according to ISO 1133 at 190° C. at load of 2.16 kg) of E>(9800−36SF−1000MI2)/60.
Dependencies are inferred from the claim text.