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1. (WO2017093008) ETHYLENE COPOLYMER COMPOSITION
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Claim

1 , Ethylene copolymer composition comprising an ethylene copolymer comprising an ethylene monomer and a C6-C10 α -olefin comonomer;

the ethylene copolymer having a total density of 0.945-0.980 g/cm3 and

a melt flow rate under 5 kg load (MFR5) of 0.10-0.50 g/10 min;

the ethylene copolymer having a C6-C10 α -olefin comonomer content of 1-5 % wt; wherein a Mx/My is not less than 14.0 (wherein Mx/My is the molecular weight distribution obtained from gel permeation chromatography) and

a strain hardening modulus <Gp> of the ethylene copolymer is not less than 53.4. wherein a gpcBR index of the ethylene copolymer is from 0.20 to 0.80 with


Where
are the weight average molecular weight, viscosity average molecular weight, and intrinsic viscosity from conventional gel permeation chromatography (GPC) calculation, respectively, assuming polymer is linear with no Long Chain Branch (LCB), the [η] term is the actual intrinsic viscosity, which is the measured value from the online viscometer, calculated by the viscometer peak area method for high precision; Mw is the weight average of absolute molecular weight from LS detector, also calculated by the LS peak area method for high precision; and the values of Mark-Houwink parameters, and K, are 0.725 and 0.0004416,

respectively, for polyethylene in 1 ,2,4-trichlorobenzene (TCB) at 160°C.

2. Ethylene copolymer composition according to claim 1, wherein the Mx/My is from 14.0 to 21 and preferably from 16.0 to 21.

3. Ethylene copolymer composition according to any proceeding claims, wherein the strain hardening modulus <Gp> of the ethylene copolymer is from 53.4 to 72.5, and preferably from 58.9 to 72.5.

4. Ethylene copolymer composition according to claim 4, wherein the gpcBR index of the ethylene copolymer is from 0.20 to 0.80, preferably from 0.20 to 0,60, more preferably from 0.20 to 0.50.

5. Ethylene copolymer composition according to any proceeding claims, wherein the ethylene copolymer is a bimodal ethylene copolymer comprising a low average molecular weight ethylene homopolymer fraction and a high average molecular weight ethylene copolymer fraction.

6. Ethylene copolymer composition according to any proceeding claims, wherein the ot- olefin comonomer is selected from 1-hexene, 1-octene, 1-decene or mixtures thereof.

7. Ethylene copolymer composition according to claim 6, wherein the weight ratio between the low average molecular weight fraction and the high average molecular weight fraction is in the range from 35:65 to 65:35.

8. Ethylene copolymer composition according to any of claims 5 to 7, wherein the bimodal ethylene copolymer comprises 52 to 60 % wt of the low average molecular weight ethylene homopolymer fraction and 40 to 48 % wt of the high average molecular weight ethylene copolymer fraction and preferably the low average molecular weight ethylene homopolymer fraction has an MFRj in a range of 300 to 600 g/l Omin and a density > 0.970 g/cm3 and the high average molecular weight ethylene copolymer fraction has an MFR5 in the range of 0.20 - 0.25 g/lOmin and density within a range of 0.952 - 0.955 g/cm3.

9. An article comprising a polymer composition according to any proceeding claims 1 to 9.

10. An article according to claim 9 wherein the article is a pressured or non-pressured pipe.