Polyolefins and uses thereof
AssigneeFina Research, S.A.
InventorEtienne Laurent
Life of this patent
Estimating the term…
Abstract
Provided is a high density multimodal polyethylene, having a shear ratio (SR) of 18 or more and comprising at least 20% by weight of a high molecular weight fraction, which high molecular weight fraction has: (a) a density (ρ) of 0.930 g/cm3 or less; and (b) a high load melt index (HLMI) of 0.30 g/10 mins or less.
Claims30
A high density multimodal polyethylene, having a shear ratio (SR) of 18 or more and comprising at least 20% by weight of a high molecular weight fraction, which high molecular weight fraction has:
- (a) a density (ρ) of 0.930 g/cm3 or less;
- and
- (b) a high load melt index (HLMI) of 0.30 g/10 mins or less.
A high density multimodal polyethylene according to any preceding claim, having a total density of 0.955 g/cm3 or less.
A polyethylene pipe comprising a high density multimodal polyethylene having a high molecular weight fraction, which high molecular weight fraction has a density (ρ) and a high load melt index (HLMI), which satisfy the following relationship:
- ρ×HLMI≦0.37
- wherein the units of density are g/cm3 and the units of HLMI are g/10 mins, and the density is 0.930 g/cm3 or less.
An article having resistance to stress-cracking, the article being formed of a high density multimodal polyethylene comprising a high molecular weight fraction, which high molecular weight fraction has a density (ρ) and a high load melt index (HLMI), which satisfy the following relationship:
- ρ×HLMI≦0.37
- wherein the units of density are g/cm3 and the units of HLMI are g/10 mins, wherein the high density multimodal polyethylene comprises at least 20% by weight of the high molecular weight fraction and the density (ρ) is 0.930 g/cm3 or less and the high load melt index (HLMI) is 0.40 g/10 mins or less.
Dependencies are inferred from the claim text.