Patent ID: 7078097
Filing Date: 2006-07-18
Classification: D01F,Y10T

Abstract:
1. A polyethylene multi-filament yarn comprising a polyethylene having an intrinsic viscosity in decalin at 135° C. of from about 5 dl/g to 35 dl/g, fewer than about two methyl groups per thousand carbon atoms, and less than about 2 wt. % of other constituents, said multi-filament yarn having a tenacity of at least 17 g/d as measured by ASTM D2256-02, wherein filaments of said yarn have a peak value of the ordered-sequence length distribution function, F(L), at a straight chain segment length L of at least 40 nanometers as determined at 23° C. from the low frequency Raman band associated with the longitudinal acoustic mode (LAM- 1 ), and a parameter of intrachain cooperativity of the melting process, ν, of at least 535 as determined by differential scanning calorimetry (DSC) of the first polyethylene melting endotherm at a heating rate extrapolated to 0° K/min from at least 3 melting scans at heating rates less than 2° K/min, said DSC calorimetry being conducted of a filament segment of about 0.03 mg mass cut into pieces of about 5 mm length wrapped in parallel array in a Wood's metal foil and placed in an open sample pan.