High-strength polyamide fiber

Details High-strength polyamide fiber High-strength polyamide fiber

D - Textiles, Paper

01

F

D01F 6/60 (2006.01) D01F 11/08 (2006.01) D06M 13/165 (2006.01) D06M 13/224 (2006.01) D06M 13/292 (2006.01) D06M 15/41 (2006.01)

Patent

CA 2134095

To provide a polyamide fiber such as polyhexa- methylene adipamide fiber having high tenacity and excellent tenacity retention after vulcanization and GY fatigue life. This fiber is a high tenacity polyamide fiber, preferably a polyhexamethylene adipamide fiber comprising at least 95$ by mole of hexamethylene adipamide units and having a sulfuric acid relative viscosity of at least 3.0, said polyamide fiber satisfying the requirements: (a) differential birefringence .delta..DELTA.n ~ -5 × 10-3 to 0 × 10-3, (b) long period (Dm) in the direction of fiber axis: Dm ~ 105 A, and long period (De) in the radial direction of fiber: De = 90 to 130 A, (c) main dispersion peak temperature (T.alpha.) in mechanical loss tangent (tan.delta.) curve as obtained by viscoelastic measurement: T.alpha. ~ 125°C, and preferably further satisfying the requirements: (d) birefringence .DELTA.n ~ 60 × 10-3, (e) crystal orientation function fc ~ 0.88, and (f) amorphous orientation function fa = 0.70 to 0.85.

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