Fasern, tapes, monofilaments based on ethylene copolymers with alfa-olefins
AssigneeIneos Manufacturing Belgium NV
InventorsChoon Chai, Dominique Jan, Stefan Spitzmesser
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Abstract
The present invention relates to fibres, tapes, monofilaments and the like comprising copolymers of ethylene and α-olefins which exhibit improved tensile properties expressed as a balance between tenacity and elongation at break. The copolymers may preferable be prepared by use of metallocene catalyst systems in particular by use of monocyclopenadienyl catalyst systems. The fibres, tapes, monofilaments of the invention are particularly suitable for end-use applications including artificial grass, woven and nonwoven fabrics, cordages, ropes, netting and flexible intermediate bulk containers.
Claims30
1-29. (canceled)
A fibre, tape, filament or similar comprising a polyethylene composition comprises a copolymer of ethylene and a α-olefin said copolymer having
- (a) a density in the range 0.900-0.970 g/cm3, and
- (b) a melt index MI2 (2.16 kg, 190° C.) in the range 0.7-50 g/10 min characterized in that said fibre, tape, filament or similar has a tenacity, elongation at break (%) and melt index wherein
- [δ log(elongation)/δ(tenacity)]≧M×(melt index)+C
- wherein M=−0.45 and C=−0.55
A fibre, tape, filament or similar comprising a polyethylene composition comprises a copolymer of ethylene and a α-olefin having a unimodal molecular weight distribution said copolymer having
- (a) a density in the range 0.900-0.970 g/cm3, and
- (b) a melt index MI2 (2.16 kg, 190° C.) in the range 0.7-50 g/10 min
- characterized in that said fibre, tape, filament or similar has a tenacity, elongation at break (%) and melt index wherein
- [δ log(elongation)/δ(tenacity)]≧M×(melt index)+C
- wherein M=−0.48 and C=−0.68
A fibre, tape, filament or similar comprising a polyethylene composition comprises a copolymer of ethylene and a α-olefin prepared by polymerization in the presence of a single site catalyst system said copolymer having
- (a) a density in the range 0.900-0.970 g/cm3, and
- (b) a melt index MI2 (2.16 kg, 190° C.) in the range 0.01-50 g/10 min
- characterized in that said fibre, tape, filament or similar has a tenacity, elongation at break (%) and melt index wherein
- [δ log(elongation)/δ(tenacity)]≧M×(melt index)+C
- wherein M=−0.43 and C=−1.2
A fibre, tape, filament or similar comprising a polyethylene composition comprises a copolymer of ethylene and a α-olefin prepared by polymerization in the presence of a single site catalyst system said copolymer having
- (a) a density in the range 0.900-0.970 g/cm3, and
- (b) a melt index MI2 (2.16 kg, 190° C.) in the range 0.01-50 g/10 min
- characterized in that said fibre, tape, filament or similar has a tenacity and elongation at break (%) wherein
- (i) elongation (%) ≦21.4×(tenacity)−1.05
- (ii) tenacity ≦0.16 N/Tex
Dependencies are inferred from the claim text.