Flame retardant lyocell filament

Abstract

The invention relates to a filament having flame retardant properties, as well as methods for its preparation and its use. The filament according to the invention are Lyocell filaments.

1 . A lame retardant filament (FR filament), comprising a flame retardant and cellulose, wherein the FR filament is a lyocell filament. 
     
     
         2 . The FR filament according to  claim 1 , having an average dry tenacity of at least 22 cN/tex. 
     
     
         3 . The FR filament according to  claim 1 , having an average wet tenacity of at least 11 cN/tex. 
     
     
         4 . The FR filament according to  claim 1 , wherein the amount of flame retardant is from 2 to 50 wt.-%. 
     
     
         5 . A method for producing a FR filament according to  claim 1 , comprising: providing a composition comprising pulp, NMMO, water and a flame retardant to form a spinning solution, and spinning the spinning solution to produce the FR filament. 
     
     
         6 . The method according to  claim 5 , wherein the amount of the flame retardant and the pulp in the spinning solution is in the range of from 12 to 25% of the spinning solution. 
     
     
         7 . The method according to  claim 5 , wherein the spinning velocity is in the range of from 250 to 750 m/min. 
     
     
         8 . The method according to  claim 5 , wherein the pulp comprises sulfite and sulfate cellulose. 
     
     
         9 . A product comprising the FR filament according to  claim 1 . 
     
     
         10 . A product comprising the FR filament according to  claim 5 . 
     
     
         11 . The product according to any one of  claim 9  or  10 , wherein the FR filament is blended with other types of fibers. 
     
     
         12 . The product according to any one of  claim 9  or  10 , satisfying the demands according to EN ISO 14 116 classification “limited flame spread index 3” when tested according to EN ISO 15025:2002 Process B—edge flaming. 
     
     
         13 . The product according to any one of  claim 9  or  10 , being a multi filament yarn. 
     
     
         14 . The product according to any one of  claim 9  or  10 , wherein the FR filament comprises a resin finish. 
     
     
         15 . The product according to any one of  claim 9  or  10 , wherein the product is comprised of yarn, fabrics, textile products or combinations thereof.