Title:
LIQUID CRYSTAL POLYESTER FIBER
Document Type and Number:
Japanese Patent JP3427470
Kind Code:
B2
Abstract:
PURPOSE: To obtain a liquid crystal polyester fiber having high strength and high modulus of elasticity, comprising a melt liquid crystal forming polyester showing optical anisotropy in a melt state.
CONSTITUTION: A thermotropic liquid crystal forming polyester comprising 80-90mol% based on the total of a mixture of a structural unit formed from p-hydroxybenzoic acid and a polyester structural unit composed of 4,4'- dioxybiphenyl and terephthalic acid in the molar ratio of 80/20 to 95/5 and 20-10mol% of a polyester structural unit composed of ethylene glycol and terephthalic acid is subjected to melt spinning to form a liquid crystal polyester fiber. The fiber shows the degree of orientation of formula I of ≤2.5 and the plane orientation ratio of formula II of ≤2.8 when peak strengths Iy and Ix of C=C stretching vibration band of benzene ring in measurement of polarized light horizontal and vertical to a fiber axis by laser Raman spectroscopy and peak strengths Iyy and Ixx of carbonyl group stretching vibration band have correlations of the degree of orientation A=Iy/Ix, the degree of orientation C=Iyy/Ixx and the degree of plane orientation D = the degree of orientation C/the degree of orientation A.
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Inventors:
Satoshi Hirai
Futoshi Sasamoto
Futoshi Sasamoto
Application Number:
JP7330894A
Publication Date:
July 14, 2003
Filing Date:
April 12, 1994
Export Citation:
Assignee:
Toray Industries, Inc.
International Classes:
D01F6/62; C08G63/60; D01D4/02; D01F6/84; (IPC1-7): D01F6/62; D01F6/84
Domestic Patent References:
| JP5331708A | ||||
| JP649707A |