Lubricants for Synthetic Fibers and Lubricating Methods for Synthetic Fibers

摘要

It is an object of the present invention to provide an excellent synthetic fiber which gives an excellent lubricity to a synthetic fiber even when it is manufactured at a high temperature and at a high contact pressure and can obtain an excellent synthetic fiber having little occurrence of fluff or yarn breakage in the production process , A lubricant for synthetic fibers, and a method for treating synthetic fibers.;As means for solving the above-mentioned problems, a specific polyether polyester block copolymer having a polymer block formed of a linking group formed of a polyether block, a polyester block and both blocks in a molecule was used as a lubricant.