B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
204/91.74
B29C 71/04 (2006.01) B29C 47/00 (2006.01) B29C 61/00 (2006.01) C08J 5/18 (2006.01) D01F 6/04 (2006.01) D06M 10/00 (2006.01) B29C 35/08 (2006.01) B29C 55/00 (2006.01)
Patent
CA 1263097
22772-1038 ABSTRACT OF THE DISCLOSURE Novel gel-spun, irradiated and drawn ultra high strength high molecular weight and at least partially cross-linked and/or broadened polyethylene filaments, tapes and films, exhibiting sub- stantially lower creep rates than corresponding but non-irradiated articles are described, along with a process for making the same. More particularly the invention relates to a gel-spun, irradiated and drawn, and at least partially cross-linked or branched ultra high strength polyethylene article in the form of a film, tape or fiber and exhibiting the following characteristics in combination (1) a tensile strength of at least (2.3-1.3 x 10-2 D) GPa where D is the thickness or diameter of uniaxially oriented tapes and filaments, in µm, or a tensile strength of at least 0.5 GPa in case of biaxially drawn films; (2) a modulus of at least 30 GPa; (3) a xylene insoluble content of at least 25%; (4) an at least 20% retained peak area under the DSC main melting point curve upon second heating after an initial heating about 170°C; (5) a retention of a retractive force plateau after reaching thermal equilibrium upon heating the fiber to a tempera- ture above about 170°C; and (6) retention, after heating and reaching thermal equilibrium above 170°C under restraint, of an X-ray diffraction pattern substantially corresponding to oriented, crystallized polyethylene.
481156
Dsm N.v.
Fetherstonhaugh & Co.
Lemstra Pieter J.
Stamicarbon B.v. (licensing Subsidiary Of Dsm)
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