Polycarbonate fibers, fiber structure and resin composite body
AssigneeKuraray Co., Ltd.
InventorsTakeshi Tsudaka, Hideki Kamada, Ryokei Endo
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Abstract
Provided are a polycarbonate fiber having a specific orientation degree and/or a specific birefringence value, a fiber structure as well as a resin composite body. The polycarbonate fiber may have an orientation degree (ft) of lower than 0.70, the orientation degree (ft) being defined by the following formula: ft=1−(1.0/C)2, C: obtained sonic velocity (km/sec), and may have a birefringence value of 0.04 or lower. The polycarbonate fiber may comprise a polycarbonate resin having a number-average molecular weight (Mn) of from 12000 to 40000 and/or a weight-average molecular weight (Mw) of from 25000 to 80000.
Claims17
A polycarbonate fiber having an orientation degree (ft) of lower than 0.70, the orientation degree (ft) being defined by the following formula:
- ft=1−(1.0/C)2
- C:
- obtained sonic velocity (km/scc).
A polycarbonate fiber having a birefringence value of 0.040 or lower, wherein
- the polycarbonate fiber comprising a polycarbonate resin having a number-average molecular weight (Mn) of from 12000 to 40000 and/or a weight-average molecular weight (Mw) of from 25000 to 80000.
A method for producing polycarbonate fibers, the method comprising:
- melt-kneading a polycarbonate resin at a high temperature of 305° C. or higher to give a molten polymer;
- discharging the molten polymer through a spinning nozzle at a predetermined rate to give as-spun fibers;
- and
- winding the as-spun fibers at a predetermined winding speed.
Dependencies are inferred from the claim text.