Hydrolysis-resistant polyester fibers and filaments, masterbatches and processes for the production of polyester fibers and filaments

摘要

A process for the production of hydrolysis resistant polyester fibers and filaments (preferably monofilaments for use in paper making machine sieves) comprises feeding a masterbatch of a polymeric carrier and an end group blocking agent to a spinneret together with a thread- forming polyester material, wherein the polymeric carrier has practically no end groups which react with the end group blocking agents. In addition to the process and the masterbatch, the polyester fibers or filaments of increased resistance to hydrolysis, in which the agents for blocking the end groups are distributed inhomogeneously over the cross- section of the monofilament, comprise a content of end group blocking agent that increases continuously from the core to the jacket of the fiber.