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US 2004/0204542 A1Published application
Ethylene polymer composition
AssigneeInnovene Manufacturing Belgium NV
InventorsVirginie Mattioli, Fabian Siberdt, Andre Frederich
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AssigneeInnovene Manufacturing Belgium NV
InventorsVirginie Mattioli, Fabian Siberdt, Andre Frederich
Estimating the term…
A composition is disclosed having a density of at least 950 kg/m3, a fluidity index MI5 of 0.05 to 2 g/10 min and a content of alpha-olefin containing from 4 to 10 carbon atoms of from 0.15 to 1 mole %, comprising:—from 53 to 63% by weight based on the total weight of the composition of an ethylene polymer fraction (A) having a fluidity index MI2 of at least 100 g/10 min, a density of at least 969 kg/m3 and a molecular weight distribution Mw/Mn greater than 4, and −37 to 47% by weight with based on the total weight of the composition of a copolymer fraction (B) of ethylene and from 0.32 to 2.7 mole % of at least one alpha-olefin containing from 4 to 10 carbon atoms, a fluidity index MI5 Of 0.001 to 0.5 g/10 min, a density of no more than 930 kg/m3 and a molecular weight distribution Mw/Mn, greater than 4,—wherein the ratio of the MI2 of fraction (A) to the MI5 of fraction (B) is greater than 2000.
1- A composition having a density of at least 950 kg/m3, a fluidity index MI5 of 0.05 to 2 g/10 min and a content of alpha-olefin containing from 4 to 10 carbon atoms of from 0.15 to 1 mole %, comprising:
2- A composition according to claim 1, characterised in that it has a density between 952 kg/m3 and 960 kg/m3.
3- A composition according to claim 1, characterised in that it has an MI5 of at least 0.1 and not exceeding 1 g/10 ml.
4- A composition according to any one of claims 1 to 3, characterised in that it comprises at least 55% by weight with respect to the total weight of the composition of the ethylene polymer fraction (A).
5- A composition according to claim 4, characterised in that it comprises 57-62% by weight with respect to the total weight of the composition of the ethylene polymer fraction (A), and 38-43% by weight with respect to the total weight of the composition of the copolymer fraction (B).
6- A composition according to any one of claims 1 to 5, characterised in that the composition comprises at least 0.2% mole % and at most 0.7 mole % of monomer units derived from the alpha-olefin containing from 4 to 10 carbon atoms.
7- A composition according to any one of claims 1 to 6, characterised in that the alpha-olefin is 1-butene and/or 1-hexene.
8- Composition according to any preceding claim, which has an FNCT, reflected by a rupture time as measured by the method described in the standard undergoing preparation ISO/DIS 16770.2 (2001) (at 80° C., under a stress of 5.0 MPa (in an Arkopal N110 2% solution)), of greater than 100 hours.
9- Composition according to any preceding claim, which has an MRS rating of 11.2 or better according to standard ISO/TR 9080.
10- Process for making a composition as defined in any one of claims 1 to 9, wherein, in at least two polymerisation reactors collected in series, the following steps are performed:
11- Process according to claim 10, characterised in that the catalyst utilised comprises from 10 to 30% by weight of transition metal, from 0.5 to 20% by weight of magnesium, from 20 to 60% by weight of a halogen and from 0.1 to 10% by weight of aluminium.
12- Use of a composition as defined in any one of claims 1 to 9 for the manufacture of pipes.
13- Process for the manufacture of pipes, comprising extruding a composition according to any one of claims 1 to 9 or formed by a process as defined in claims 10 or 11.