B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/1043, 18/628,
B29C 55/04 (2006.01) B29C 47/00 (2006.01) C08J 5/18 (2006.01) C08K 5/00 (2006.01) C08L 23/06 (2006.01) D01D 5/12 (2006.01) D01F 6/04 (2006.01) B29C 55/00 (2006.01)
Patent
CA 1216119
Abstract of the Disclosure A process for producing a stretched article of ultrahigh-molecular-weight polyethylene; which comprises (1) melt-kneading a mixture composed of (A) 15 to 80 parts by weight, per 100 parts by weight of components (A) and (B) combined, of ultra- high-molecular-weight polyethylene having an inherent viscosity [n] of at least 5 dl/g, and (B) 85 to 20 parts by weight, per 100 parts by weight of components (A) and (B) combined, of an aliphatic compound (b1) of at least 8 carbon atoms having a melting point of at least 10°C and a boiling point of at least 130°C, wherein up to 80% by weight of the aliphatic compound (b1) may be replaced by a low softening point hydrocarbon polymer (b2) having a softening point of not more than 130°C and a weight average molecular weight (Mw) of not more than 2,000, in a screw extruder while maintaining the mixture at a temperature ranging from the molting point of the mixture to 300°C, (2) melt-extruding the molten mixture through a die kept at a temperature ranging from the melting point of the mixture to 300°C, (3) cooling the resulting unstretched extrudate to solidify it, and (4) subjecting the unstretched solidified extrudate to a stretching treatment at a temperature ranging from the melting point or component (B) to a point 20°C above the melting point of the mixture at a stretch ratio of either at least about 3:1 when step (2) is carried out while a draft is applied to the unstretched extrudate or at least about 10:1 when step (2) is carried out in the absence or a draft.
481470
Mantoku Hitoshi
Motooka Masanori
Takeda Hiroyuki
Takimoto Kazuyuki
Yagi Kazuo
Mitsui Chemicals Incorporated
Smart & Biggar
LandOfFree
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