High tenacity, high modulus polyethylene and polypropylene fibers and intermediates therefore
Stretched polyethylene filaments of high strength and high modulus, and their production
Heat shrunk fabrics provided from ultra-high tenacity and modulus fibers and methods for producing same
Resin or rubber article reinforced with a polyolefin fiber having improved initial elongation
Molecular orientation articles molded from high-molecular weight polyethylene and processes for preparing same
Molecular orientation articles molded from high-molecular weight polyethylene and processes for preparing same Patent #: 5302453
ApplicationNo. 385238 filed on 02/08/1995
US Classes:428/364, Rod, strand, filament or fiber428/394, Synthetic resin or polymer428/902HIGH MODULUS FILAMENT OR FIBER
ExaminersPrimary: Ryan, Patrick
Assistant: Gray, J. M.
Attorney, Agent or Firm
Foreign Patent References
International ClassD02G 003/00
AbstractBy poststretching, at a temperature between about 135° and 160° C., a polyethylene fiber, which has already been oriented by drawing at a temperature within 5° C. of its melting point, an ultra high modulus, very low creep, low shrink, high tenacity polyolefin fiber having good strength retention at high temperatures is obtained. The poststretching can be in multiple stages and/or with previous annealing. The poststretching should be done at a draw rate of less than 1 second-1. Tensile modulus values over 2,000 g/d for multifilament yarn are consistently obtained for ultrahigh molecular weight-polyethylene, with tensile strength values above 30 g/d while at the same time dramatically improving creep (at 160° F. (71.1° C.) and 39,150 psi load) by values at least 25% lower than fiber which has not been poststretched. Shrinkage is improved to values less than 2.5% of the original length when heated from room temperature to 135° C. Performance at higher temperature is improved by about 15° to 25° C.