Process for preparing pigmented fiber-forming polymer, fiber produced therefrom and carpet containing such fiber

Je pops n zp sob v²roby pigmentovan ho vl knotvorn ho polymeru zvl kniteln ho v tavenin a rezistentn ho proti kysel²m barviv m, p°i kter m se (a) polymeruje sm s sest vaj c v podstat z monomer tvo° c ch polyamid a sulfon tu, (b) ke kopolymeru z (a) p°id pigment nebo pigmentov² koncentr t, p°i em pigmentov² koncentr t v podstat sest v z alespo jednoho pigmentu a polymern matrice, a (c) st koncov²ch aminoskupin p° tomn²ch v pigmentovan m sulfon tovan m polyamidov m kopolymeru podle (b) chemicky blokuje chemicky blokuj c m prost°edkem. Je tak pops no vl kno vyrobiteln zvl k ov n m takov ho polymeru a koberec zhotoven² tkan m z tohoto vl kna a anionicky vybarviteln ho vl kna.\ In the present invention there is describer a process for preparing pigmented acid-dye resistant melt spun fiber-forming polymer, which preparation process comprises (a) polymerizing a mixture essentially consisting of polyamide building monomers and a sulfonate, (b) adding pigment or pigment-concentrate to the sulfonated polyamide copolymer according to (a), whereas the pigment-concentrate essentially consists of at least one pigment and a polymer matrix, (c) chemically blocking a portion of amino end groups present in the pigmented sulfonated polyamide copolymer according to (b) with a chemically blocking agent. Described is also a fiber being produced by spinning such polymer as well as carpet made from a fiber spun from the polymer and an anionically dyeable fiber.