Mass-colored formed structures based on aromatic polyamides, mass- colored fiber, and premix for producing mass-colored formed structures

摘要

A process for producing mass-colored fiber or film, comprises the steps of:PPa) preparing a premix by grinding a composition comprising a polar aprotic organic solvent, 5 to 30% by weight of an aromatic polyamide and 0.5 to 5% by weight of a color- conferring solid component so that the color-conferring solid component has particles with an average diameter of less than 200 nm,P Pb) preparing a forming solution by mixing the premix produced in step a) with a solution comprising a polar aprotic organic solvent and an aromatic polyamide which corresponds to the aromatic polyamide used in step a), just upstream of a forming die,PPc) extruding the forming solution through the forming die which comprises orifices in a predetermined number and shape to produce primary fiber or film, PPd) removing the polar aprotic organic solvent in a conventional manner to leave solvent-leaner or-free fiber or film of sufficient mechanical stability and nontackiness for further processing, andPPe) optionally orienting the resulting fiber or film in a convention manner.