Abstract: The present invention relates to masterbatches for delustring processable polyamides.They contain 50 to 90% of a copolyamide used as a binder and consisting of 30 to 100% of hexamethylene adipamide units and 0-70% of caproamide units and 10 to 50% by weight of anatase titanium dioxide coated with 0.01 to 1.5% of silica and 1 to 3% of alumina and treated with a polydimethylsiloxane oil present in a proportion of 0.2 to 10% by weight of TiO.sub.2.They are obtained by adding TiO.sub.2 powder into the autoclave immediately after the pressure release stage, when the reaction mass is still at a high temperature and before vacuum is applied.The masterbatches according to the invention may be introduced directly into the liquid stream of the polymer to be spun.