Melt-spun high-strength polyethylene fibre
AssigneeBorealis A/S
InventorsOlli T. Turunen, Jan Fors, Erik Thaels
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Abstract
The invention concerns a high strength polyethylene fibre, which is prepared by melt spinning polyethylene having a high density through a spinnerette, by cooling the fibre coming out from the spinnerette and by stretching the fibre obtained at 50.degree.-150.degree. C. The polyethylene used in the melt spinning is a homopolymer of ethylene having a weight average molecular weight M.sub.w between 125000-175000 g/mol, a number average molecular weight M.sub.n between 26000-33000 g/mol, polydispersity (M.sub.w /M.sub.n) below 5 and the density higher than 955 g/dm.sup.3. The stretching degree in the drawing step is at least 400%.
Claims15
A high strength polyethylene fibre, which is prepared by melt spinning polyethylene having a high density through a spinnerette, by cooling the fibres coming out from the spinnerette and by stretching the fibre obtained at a temperature of 50.degree.-150.degree. C., characterized in that the polyethylene used in the melt spinning is a homopolymer of ethylene, which fullfills the following conditions:
- a weight average molecular weight M.sub.w is between 125000-175000 g/mol;
- the number average molecular weight M.sub.n is between 26000-33000 g/mol;
- a polydispersity (M.sub.w /M.sub.n) is below 5;
- a density is greater than 955 g/dm.sup.3 ;
- and that the stretching degree in the drawing step is at least 400%.
Dependencies are inferred from the claim text.