SETT FOR FRAMSTELLNING AV FLAMBESTENDIGA FIBRER AV REGENERAD CELLULOSA GENOM TILLSATS AV EN FOSFORFORENING

摘要

Flame-retardant fibers of regenerated cellulose are produced by adding one or more flame-retardant phosphorus compounds to the viscose, extruding the viscose into a spinning bath and, if desired, stretching and after-treating the resulting filaments or staple fibers. The flame-retardant agent is a compound of the general formula PNxOy IN WHICH X STANDS FOR A NUMBER BETWEEN 0.9 AND 1.7 AND Y STANDS FOR A NUMBER BETWEEN 1.2 AND 0, WHERE THE Y-VALUES CONVERGE TOWARDS ZERO AS THE X-VALUES INCREASE. The flame-retardant agent is more particularly used in a proportion approximately between 5 and 30 weight %, based on the weight of the cellulose.