Lubricants for elastic fiber

摘要

The present invention provides a spin finish for elastic fibers which comprises an amphoteric surfactant and/or a cationic surfactant as well as a base oil and has a surface tension thereof at 25 of 14 to 35 mN/m and a volume resistivity thereof at 20 of 1x10<7 >to 1x10<13 >Omega cm;a spin finish for elastic fibers which comprises an ionic surfactant and a base oil and has a surface tension (S) thereof at 25° C. of 14 to 22.5 mN/m and a volume resistivity (rho) thereof at 20° C. of 1x10<7 >to 1x10<13 >Omega cm, rho and S satisfying the following relation [1];a spin finish for elastic fibers which comprises a quaternary ammonium salt of the specific composition, a base oil and a higher fatty acid (C5-30) metal salt powder;a method of treating an elastic fiber which comprises providing an elastic fiber with any of the above spin finish for elastic fibers in an amount of 0.1 to 12% by weight of said fiber;and an elastic fiber which is obtained by the above treatment method.