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AssigneesNippon Oil Co., Ltd., Nippon Petrochemicals Company, Limited, Polymer Processing Research Institute Ltd.
InventorsSeizo Kobayashi, Takashi Mizoe, Yoshimu Iwanami, Osamu Otsu, Shigeki Yokoyama, Kazuhiko Kurihara, Hiroshi Yazawa
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The present invention provides a split polyethylene stretched material having a tensile strength of at least 0.7 GPa when twisted in the range of 50-500 times/m, which material is produced by subjecting a polyethylene having an intrinsic viscosity of 5-50 dl/g as measured at 135.degree. C. in decalin, i.e. an ultra-high-molecular-weight polyethylene to stretching and then subjecting the stretched polyethylene to splitting, as well as a process for producing said material. The split polyethylene stretched material according to the present invention has a large surface area and accordingly can be easily laminated to other materials, and has a high strength and flexibility.
A split polyethylene stretched material having a tensile strength of 0.7 to 5 GPa when twisted in the range of 50-500 times/m, which material is produced by subjecting a polyethylene having an intrinsic viscosity of 5-50 dl/g as measured at 135.degree. C in decalin, to compression-molding at a temperature lower than the melting point of the polyethylene to obtain a sheet, subjecting the sheet to rolling and stretching and then subjecting the stretched polyethylene to splitting, wherein the splitting is carried out using a tapping screw-like splitter or a file-like splitter.
A process for producing a split polyethylene stretched material having a tensile strength of 0.7 to 5 GPa when twisted in the range or 50-500 times/m, which process comprises subjecting a polyethylene having an intrinsic viscosity of 5-50 dl/g as measured at 135.degree. C in decalin, to compression molding at a temperature lower than the melting point of the polyethylene to obtain a sheet, subjecting the sheet to rolling and pulling to successively stretch the sheet, and subjecting the stretched sheet to splitting, wherein the splitting is carried out using a tapping screw-like splitter or a file-like splitter.
Dependencies are inferred from the claim text.