Process for the production of shaped cellulose articles

Abstract

A method of manufacturing a cellulose-based shaped article. The method comprises subjecting a solution of lignocellulosic material, dissolved in a distillable ionic liquid, to a spinning method, wherein the ionic liquid is a diazabicyclononene (DBN)-based ionic liquid. DBN-based ionic liquids have good dissolution power, high thermal and chemical stability, lack runaway reactions and exhibit low energy consumption, due to low spinning temperatures. The shaped cellulose articles can be used as textile fibres, high-end non-woven fibres, technical fibres, films for packaging, and barriers films in batteries, as membranes and as carbon-fibre precursors.

1 .- 18 . (canceled) 
     
     
         19 . A shaped cellulose-based article, especially a fibre or film, manufactured by a method of manufacturing of a cellulose-based shaped article by subjecting a solution comprising a lignocellulosic material dissolved in a distillable ionic liquid to a spinning method, wherein the ionic liquid is a diazabicyclononene (DBN) based ionic liquid. 
     
     
         20 . Use of a fibre in woven or non-woven textiles, for technical purposes, or for use as carbon fibre precursors, wherein the fibre is manufactured by a method of manufacturing of a cellulose-based shaped article by subjecting a solution comprising a lignocellulosic material dissolved in a distillable ionic liquid to a spinning method, wherein the ionic liquid is a diazabicyclononene (DBN) based ionic liquid. 
     
     
         21 . A solution comprising a lignocellulosic material dissolved in a distillable ionic liquid, suitable for use in a method for the manufacture of a cellulose-based shaped article, such as a fibre or a film, by subjecting said solution to a spinning method, particularly an air-gap spinning, wet spinning, or dry jet wet spinning method, wherein the ionic liquid is a diazabicyclononene (DBN) based ionic liquid. 
     
     
         22 . The solution according to  claim 21 , wherein the DBN-based ionic liquid comprises a DBN-based cation and an anion imparting a high basicity, in terms of the Kamlet-Taft beta (β) parameter, said cation having a residue R, which is selected from the group of hydrogen, linear and branched alkyl, typically C 1 -C 6  alkyl, C 1 -C 6  alkoxy, C 1 -C 10  alkoxyalkyl, and C 6-18  aryl groups, which optionally are substituted with one or more substituents selected from hydroxy and halogen. 
     
     
         23 . The solution according to  claim 21 , wherein the DBN-based ionic liquid
 comprises a 1,5-diazabicyclo[4.3.0]non-5-enium cation of the formula (I)   
       
         
           
           
               
               
           
         
         wherein 
         R 1  is selected from the group consisting of hydrogen, linear and branched C 1 -C 6  alkyl, C 1 -C 6  alkoxy, C 1 -C 10  alkoxyalkyl and C 6-18  aryl groups, which optionally are substituted with one or more substituents selected from hydroxy and halogen, and 
         an anion selected from halides, such as fluoride, chloride, bromide and iodide; pseudohalides, such as cyanide, thiocyanide, and cyanate; a carboxylate, preferably formate, acetate, propionate, or butyrate; an alkyl sulphite, an alkyl sulphate, a dialkyl phosphite, a dialkyl phosphate, a dialkyl phosphonites, and a dialkyl phosphonate. 
       
     
     
         24 . The solution according to  claim 21 , wherein the DBN-based ionic liquid has a 1,5-diazabicyclo[4.3.0]non-5-enium cation of formula (I) in  claim 23 , where R 1  is H, and a carboxylate anion. 
     
     
         25 . The solution according to  claim 21 , wherein the DBN-based ionic liquid is [DBNH][CO 2 Et] or [DBNH][OAc]. 
     
     
         26 . The solution according to  claim 21 , wherein the lignocellulosic material is a chemical, mechanical or chemimechanical pulp produced from wood or a non-wood source, preferably a bleached or unbleached chemical pulp produced by a known pulping method, such as kraft, pre-hydrolysis kraft, soda AQ, sulphite, organosolv, ASAM, ASA, or MEA pulping, most preferably the lignocellulosic material is a bleached dissolving pulp 
     
     
         27 . The solution according to  claim 21 , wherein the solution further comprises a lignin, wherein the lignin preferably is derived from a pulping process, and is alkali lignin, kraft lignin, soda-AQ lignin, lignosulphonate, thiolignin, organosolv-lignin, ASAM-lignin or ionic liquid-extracted lignin (ILL).