Abstract:
PROBLEM TO BE SOLVED: To provide a protective glove comprising a high strength polyethylene fiber having comparable or larger strength and elastic modulus than those of conventional high strength polyethylene, excellent in resistance to fatigue from flexing and abrasion resistance, hardly fibrillated and having high surface hardness. SOLUTION: The protective glove comprises a high strength polyethylene fiber having recurring units of substantially ethylene, ≥5 intrinsic viscosity and ≥22 cN/dtex average strength, wherein the measurement of the fiber by differential scanning calorimetry (DSC) exhibits a temperature-increasing DSC curve having at least one endothermic peak at a temperature range of 140°C to 148°C (on the low temperature side) and at least one endothermic peak at a temperature range of ≥148°C (on the high temperature side) or the number of frictions until the fiber being broken in an abrasion test according to method B for measuring abrasion resistance in the Testing Methods for Spun Yarn (JIS L 1095) is 100,000 or larger. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide nets comprising a high strength polyethylene fiber having comparable or larger strength and elastic modulus than those of conventional high strength polyethylene, excellent in resistance to fatigue from flexing and abrasion resistance, hardly fibrillated and having high surface hardness. SOLUTION: The nets comprise a high strength polyethylene fiber having recurring units of substantially ethylene, ≥5 intrinsic viscosity and ≥22 cN/dtex average strength, wherein the measurement of the fiber by differential scanning calorimetry (DSC) exhibits a temperature-increasing DCS curve having at least one endothermic peak over a temperature region of 140°C to 148°C. (on the low temperature side) and at least one endothermic peak over a temperature region of ≥148°C (on the high temperature side) or the number of frictions until the fiber is broken in an abrasion test according to method B for measuring abrasion resistance in the Testing Methods for Spun Yarn (JIS L 1095) is 100,000 or larger. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide an ultrahigh molecular weight polyethylene (UHMWPE) film that is used for ballistic applications, ropes, cables, nets, fabrics and the like, and has a high tensile strength and a high tensile breaking energy and preferable characteristics.SOLUTION: A UHMWPE film having a tensile strength of 2.0 GPa or more and a tensile breaking energy of 30 J/g or more is produced via a process which comprises subjecting a starting UHMWPE with a weight average molecular weight of 500,000 gram/mole or more, an elastic shear modulus determined immediately after melting at 160°C of 0.9 MPa or less, and a Mw/Mn ratio of 6 or less to a compressing step and a stretching step under such conditions that the polymer temperature is prevented from increasing beyond its melting point at any time during polymer processing. The film may be used as a starting material in any applications where a high tensile strength and a high breaking energy are important.
Abstract:
A process for manufacturing high molecular weight polyethylene fibers, including subjecting a polyethylene tape with a weight average molecular weight of at least 500,000 grams/mole, a Mw/Mn ratio of at most 6, and a 200/110 uniplanar orientation parameter of at least 3 to a force in the direction of the thickness of the tape over the entire width of the tape. A polyethylene fiber having a Mw of at least 500 000 gram/mole, a Mw/Mn ratio of at most 6, and a 020 uniplanar orientation value of at most 55°.