Very low creep, ultra high modulus, low shrink, high tenacity polyolefin fiber having good strength retention at high temperatures and method to produce such fiber
February 8, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3210452 3377329 3564835 Polymer materials 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 Inventors
AssigneeApplicationNo. 385238 filed on 02/08/1995US Classes:428/364, Rod, strand, filament or fiber428/394, Synthetic resin or polymer428/902HIGH MODULUS FILAMENT OR FIBERExaminersPrimary: Ryan, PatrickAssistant: Gray, J. M. Attorney, Agent or FirmForeign Patent References
International ClassD02G 003/00AbstractBy 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.Other References
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