| 摘要 |
Polyester fibres and filaments which have carboxyl end groups protected by reaction with carbodiimides are described, in which - the protection of the carboxyl end groups has mainly been carried out by reaction with mono- and/or biscarbodiimides which are contained in the fibres and filaments in free form only in an amount from 30 to 200 ppm, relative to the weight of the polyester, - the content of free carboxyl end groups is less than 3 meq/kg of polyester and - at least a further 0.02% by weight of at least one free polycarbodiimide or a reaction product with still reactive carbodiimide groups are contained in the fibres and filaments, and a process for their preparation. The filaments described are particularly suitable for the preparation of paper machine screens. |
