B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/1043, 18/628,
B29C 55/04 (2006.01) D01D 5/12 (2006.01)
Patent
CA 1216118
Abstract of the Disclosure A process for producing a stretched article of ultrahigh-molecular-weight polyethylene, which com- prises (1) melt-kneading a mixture composed of (A) 15 to 80 parts by weight, per 100 parts by weight of the components (A) and (B) combined, of ultrahigh-molecular- weight polyethylene having an inherent viscosity [n], determined at 135°C in decalin, of at least 5 d1/g and (B) 85 to 20 parts by weight, per 100 parts by weight of the components (A) and (B) combined, of a paraffinic wax having a melting point, determined by the DSC method, of 40 to 120 °C and a weight average molecular weight (Mw), determined by the GPC method, of at least 230 but less than 2,000 in a screw extruder while maintaining the temperature of the mixture at 180 to 280°C, (2) melt-extruding the molten mixture through a die kept at a temperature of 180 to 300°C, (3) cooling the resulting unstretched extru- date to solidify it, and (4) subjecting the unstretched solidified extrudate to a stretching treatment at a temperature of 60 to 140°C at a stretch ratio of at least about 3:1 when step (2) is carried out while a draft is applied to the unstretched extrudate or at a stretch ratio of at least about 10:1 when step (2) is carried out in the absence of a draft.
455728
Mantoku Hitoshi
Motooka Masanori
Ohno Takao
Mitsui Chemicals Inc.
Smart & Biggar
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