To provide a polyketone cord having excellent mechanical characteristics of high strength and high toughness and having excellent dimensional stability under load and under heating and a method for producing the polyketone cord.
This polyketone comprises ≥80 wt.% polyketone fiber composed of polyketone in which 97-100 wt.% of recurring unit is constituted of 1- oxotrimethylene and has characteristics satisfying the following (a) to (e): (a) tensile strength ≥8 cN/dtex; (b) toughness ≥20+14.6×K/104-14.1×(K/104)2+-2.7×(K/104)3 (cN.%/dtex) wherein K is a twist coefficient of cord represented by the formula K=Y×D0.5; (c) intermediate elongation ≤1.5×exp(5.5×K/105) (%); (d) dry heat shrinkage factor = 0-3% and (e) thermal intermediate elongation ≤1.8×exp(5.5×K/105) (%).
KATO JINICHIRO