D - Textiles – Paper – 01 – F
Patent
D - Textiles, Paper
01
F
18/599
D01F 6/60 (2006.01)
Patent
CA 1282923
HIGH STRENGTH POLYMETAPHENYLENE ISOPHTHALAMIDE FIBER AND PROCESS FOR PRODUCING THE SAME ABSTRACT OF THE DISCLOSURE A new high strength poly-m-phenylene isophthalamide fiber which comprises an m-phenylene isophthalamide polymer containing at least 95 molar% of recurring m-phenylene isophthalamide units and having an intrinsic viscosity of 0.7 to 2.5, a birefringence of 0.18 to 0.22, a degree of crystallinity of 45% to 55%, a crystalline size of 35 to 45 .ANG., a tensile strength of 6.5 g/d or more and a silk factor or 35 or more, is produced by wet-spinning a dope solution containing the polymer dissolved in an organic solvent, by carrying out a first adjustment of the content of the solvent in the wet-spun, undrawn filament to a value of 15 to 30%, by first wet drawing the first content-adjusted filament at a draw ratio of 1.1 to 1.5, by carrying out a second adjustment of the content of the solvent in the first wet drawn filament to a value less than 15%, by second wet drawing the second content-adjusted filament, and finally, by dry drawing the filament to an extent such that the entire draw ratio becomes 4.0 to 7Ø
524384
Fujie Hiroshi
Matsui Hideo
Mcfadden Fincham
Teijin Limited
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