(B. Fugetsu)2 Continuous yarns and/or fibers composed of carbon nanotubes (CNTs) are highly attractive due to their intrinsic ability to form a variety of macroscopic objects by simply knitting and/or weaving of the yarns/fibers. The production of continuous yarns of pure CNTs has been accomplished by "dry-spinning", the mechanical process of spinning either the single-walled CNTs directly from a CVD (chemical vapor deposition) gaseous reaction zone [1,2] or with the multi-walled CNTs previously grown as a vertically oriented CNT forest [3,4] . In contrast, "wet-spinning", the spinning of a "super-acid (100 + %sulfuric acid) suspension" [5] of the single-walled CNTs, produced purely CNT-based continuous fibers.The pure CNT-based yarns and/or fibers retained the advantageous properties of the individual nanotubes, such as the high electrical and thermal conductivities. However, the preparation of industrial quantities of the single-walled CNTs or the multi-walled CNT forests, the precursors for making the CNT-based yarns/fibers, is presently impractical.Continuous fibers containing a few wt % of CNTs, obtained, for example, by incorporating the single-walled CNTs into PVA polymers [6, 7], have shown excellent fiber properties, but electrical and thermal conductivities were low because of limitations on the contents of CNTs. Despite the production of continuous fibers with up to 60 wt% CNT content [8], the development of the CNT-based continuous yarns/fibers having high industrial