Novel copolymers
AssigneeIneos Manufacturing Belgium NV
InventorsChoon Kooi Chai, Dominique Jan
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Abstract
Novel copolymers are described comprising ethylene and alpha-olefins having (a) a density (D) in the range 930-960/g/m3 (b) a melt index (MI2) in the range 0.1-3.5 g/10 min (c) a melt elastic modulus G′ (G″=500 Pa) in the range 40 to 150 Pa, and (d) a ratio of complex dynamic shear viscosities η*(0.1)/η*(100) in the range 1.5 to 5.5. The novel copolymers are particularly suitable for use as Polyethylenes of Raised Temperature Resistance (PE-RT) for use in hot water piping systems. The novel copolymers may be prepared by use of meltallocene catalyst systems. Pipes having a time to failure of ≧500 hrs measured according to ISO 1167 at 110° C. and 2.6 MPa prepared in a single reactor are also disclosed.
Claims31
1-30. (canceled)
A copolymer of ethylene and an alpha-olefin said copolymer characterized in having
- (a) a density (D) in the range 930-960 kg/cm3,
- (b) a melt index (MI2) in the range 0.1-3.5 g/10 min,
- (c) a melt elastic modulus G′ (G″=500 Pa) in the range 40-150 Pa, and
- (d) a ratio of complex dynamic shear viscosities η*(0.1)/η*(100) in the range 1.5-5.5.
A copolymers of ethylene and alpha-olefins said copolymers characterized in having
- (a) a density (D) in the range 930-960 kg/m3
- (b) a melt index (MI2) in the range 0.1-3.5 g/10 min
- (c) a balance of high temperature creep resistance and products flexibility performance characterized by the equation,
- ε(100 h)≦−0.0919D+89.5
- where D is the density (in kg/m3) and ε(100 h) is the measured strain (in %) after 100 hours of tensile creep test at 95° C., under a constant stress of 2 MPa.
A copolymers of ethylene and alpha-olefins said copolymers characterized in having
- (a) a density (D) in the range 930-960 kg/m3
- (b) a melt index (MI2) in the range 0.1-3.5 g/10 min
- (c) a balance of high temperature creep resistance and products flexibility performance characterized by the equation,
- ε(100 h)≦−0.135D+129.86
- where D is the density (in kg/m3) and ε(100 h) is the measured strain (in %) after 100 hours of tensile creep test at 95° C., under a constant stress of 2 MPa.
A copolymers of ethylene and alpha-olefins said copolymers characterized in having
- (a) a density (D) in the range 930-960 kg/m3
- (b) a melt index (MI2) in the range 0.1-3.5 g/10 min
- (c) a balance of high temperature creep resistance and products flexibility performance characterized by the equation,
- ε(500 h)≦−0.124D+119.75
- where D is the density (in kg/m3) and ε(500 h) is the measured strain (in %) after 500 hours of tensile creep test at 95° C., under a constant stress of 2 MPa.
A copolymers of ethylene and alpha-olefins said copolymers characterized in having
- (a) a density (D) in the range 930-960 kg/m3
- (b) a melt index (MI2) in the range 0.1-3.5 g/10 min
- (c) a balance of high temperature creep resistance and products flexibility performance characterized by the equation,
- ε(500 h)≦−0.149D+143.2
- where D is the density (in kg/m3) and ε(500 h) is the measured strain (in %) after 500 hours of tensile creep test at 95° C., under a constant stress of 2 MPa.
A copolymers of ethylene and alpha-olefins said copolymers characterized in having
- (a) a density (D) in the range 930-960 kg/m3
- (b) a melt index (MI2) in the range 0.1-3.5 g/10 min
- (c) a critical frequency (in Hz) of activation of high temperature performances characterised by the equations:
- fC-HT≧0.85η*(0.1)/η*(100)−0.8
A copolymers of ethylene and alpha-olefins said copolymers characterized in having
- (a) a density (D) in the range 930-960 kg/m3
- (b) a melt index (MI2) in the range 0.1-3.5 g/10 min
- (c) a critical frequency (in Hz) of activation of high temperature performances characterised by the equations:
- fC-HT>2.0
A pipe comprising a copolymer of ethylene and an alpha-olefin said copolymer characterized in having
- (a) a density (D) in the range 930-960 kg/m3
- (b) a melt index (MI2) in the range 0.1-3.5 g/10 min
- (c) a melt elastic modulus G′ (G″=500 Pa) in the range 40 to 150 Pa, and
- (d) a ratio of complex dynamic shear viscosities η*(0.1)/η*(100) in the range 1.5 to 5.5.
A pipe having a time to failure according to ISO 1167 of ≧500 hours at 110° C. and 2.6 MPa said pipe comprising a copolymer of ethylene and an α-olefin produced in a single reactor.
Dependencies are inferred from the claim text.