Plastic and nonmetallic article shaping or treating: processes – With twining – plying – braiding – or textile fabric formation
Patent
1994-03-08
1995-01-31
Foelak, Morton
Plastic and nonmetallic article shaping or treating: processes
With twining, plying, braiding, or textile fabric formation
264205, 26421116, 528183, 528190, 528193, 528337, D01D 504, D01F 626, D02G 302
Patent
active
053857020
ABSTRACT:
Polybenzoxazole or polybenzothiazole polymer dopes are spun through a spinneret having an orifice density of more than 0.25 per cm.sup.2 to form filaments. The filaments formed then pass through an air gap which has a gas flowing into it at a temperature of between about 5.degree. C. to about 100.degree. C. and at a flow rate between about 0.1 meters/second and about 2.0 meters/second. The filaments cool in the air gap and are then coagulated. During or after coagulation the filaments are combined into one or more fibers. By this method of controlling the temperature in the air gap it is possible to stably spin polybenzoxazole or polybenzothiazole fibers at relatively high final line speeds.
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MRS, vol. 134, The Materials Science and Engineering of Rigid-Rod Polymers, "An Integrated Laboratory Process For Preparing Rigid Rod Fibers From The Monomers" Harvey D. Ledbette et al. pp. 253-264.
Encyclopedia of Polymer Science and Engineering, Second Edition, vol. 11, "Polybenzothiazoles and Polybenzoxazoles", by James F. Wolfe, pp. 601-635.
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Macromolecules, 1981, vol. 14, "Synthesis. Spinning & Fiber Mechanical Properties of Poly (p-phenylenebenzobisoxazole)" by E. Won Choe and Sang Nim Kim: pp. 920-924.
The following Pending U.S. patent application Ser. No. 984,828 (Attorney Docket No. 39,942); Ser. No. 985,060 (Attorney Docket No. C-40,087); Ser. No. 985,079 (Attorney Docket No. C-40,622); Ser. No. 985,080 (Attorney Docket No. C-40 623); Ser. No. 985,068 (Attorney Docket No. C-40,624).
Faley Timothy L.
Mills Michael E.
Nakagawa Masaru
Teramoto Yoshihiko
Foelak Morton
The Dow Chemical Company
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