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Patent Searching and Data


Title:
PRODUCTION OF POLYIMIDE FIBER
Document Type and Number:
Japanese Patent JPH0633316
Kind Code:
A
Abstract:

PURPOSE: To obtain a polyimide fiber suitable as a matrix resin for composite material, having excellent heat resistance, flame retardance and radiation resistance, by subjecting a thermoplastic polyimide to melt spinning under a specific condition.

CONSTITUTION: A thermoplastic polyimide comprising ≥85mol% repeating unit composed of a unit of the formula, having ≤7,000 poise melt viscosity at 100sec-1 at 400°C is subjected to melt spinning. Melt temperature (°C) ×melt retention time (minutes) is 2,000-4,200, pressure (kg/cm2) of resin to a filter before a spinneret is 80-200 and the resin is delivered at 5-12 m/minute delivery linear speed. The temperature of the spinneret is 390-420°C, the temperature of an atmosphere in a heating column is 250-400°C and thickening, gel formation and evolution of decomposed gas can be prevented.


Inventors:
Yamada, Koichi
Kuroda, Toshimasa
Application Number:
JP1992000186675
Publication Date:
February 08, 1994
Filing Date:
July 14, 1992
Export Citation:
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Assignee:
TEIJIN LTD
International Classes:
C08G73/10; D01F6/74; (IPC1-7): D01F6/74
Attorney, Agent or Firm:
前田 純博