Hydrophilic polycarbonate fibres having a high second order transition point and process for manufacturing them

摘要

Dry-spun, hydrophilic, core-sheath structure threads or fibers made of polycarbonate with a porosity and a water retention capacity of at least 10%, a mercury density less than 1.0 g / cm³, a strength of at least 1.5 cN / dtex and a glass transition temperature of at least 125 ° C and a process for the production of the threads and fibers, with the threads in a dry spinning process at shaft temperatures of at most 140 ° C immediately after exiting the spinneret, but at the latest at a point in time when the thread strengthening has not yet been completed contact with a sufficient amount of water vapor and then stretch the threads.