Lyocell fiber with increased tendency to fibrillate

Abstract

The present invention provides a lyocell fiber with increased tendency to fibrillate, requiring a time of less than 80 minutes to obtain a 50° SR value according to ISO 5267-1: 1999 while the reduction of the working capacity [c N/tex*¾] at the 50° SR value is less than 50%, as well as a method for producing same and products comprising same.

1 . A lyocell fiber with increased tendency to fibrillate without chemical treatment, requiring a time of less than 80 minutes to obtain a 50° SR value according to ISO 5267-1:1999 while the reduction of the working capacity [cN/tex*%] at the 50° SR value is less than 50%. 
     
     
         2 . The lyocell fiber according to  claim 1 , wherein the time required to obtain the 50° SR value is less than 60 minutes but more than 40 minutes. 
     
     
         3 . The lyocell fiber according to  claim 1 , wherein the reduction of the working capacity is less than 40%, preferably less than 30%. 
     
     
         4 . The lyocell fiber according to  claim 1 , having a titer of 9 dtex or less, such as 6 dtex or less, preferably 3 dtex or less. 
     
     
         5 . The lyocell fiber according to  claim 1 , produced from a pulp having a hemicelluloses content of 5 wt.-% or more, preferably 7 wt.-% or more, and 25 wt.-% or less. 
     
     
         6 . The lyocell fiber according to  claim 5 , wherein the hemicellulose comprises a ratio of C5/xylan to C6/mannan of from 125:1 to 1:3, preferably of from 25:1 to 1:2. 
     
     
         7 . The lyocell fiber according to  claim 5 , wherein the pulp comprises 5 wt.-% or more xylan, preferably 8 wt.-% or more, more preferably 10 wt.-% or more and/or 3 wt.-% or more mannan, preferably 5 wt.-% or more mannan, and/or 1 wt.-% or less mannan. 
     
     
         8 . A pulp for producing a fiber according to  claim 1 , wherein the pulp has a hemicelluloses content of 7 wt.-% or more and 25 wt.-% or less. 
     
     
         9 . The pulp according to  claim 8 , wherein the hemicellulose comprises a ratio of C5/xylan to C6/mannan of from 125:1 to 1:3, preferably of from 25:1 to 1:2. 
     
     
         10 . The pulp according to  claim 8 , wherein the pulp comprises 5 wt.-% or more xylan. 
     
     
         11 . A method for producing the lyocell fiber according to  claim 1  using a direct dissolution process. 
     
     
         12 . The method for producing the lyocell fiber according to  claim 11  using a amine oxide process, where an aqueous solution of the amine oxide and the pulp form a cellulose suspension and a shapeable solution which gets shaped and coagulated in a spin bath obtaining the lyocell fiber after washing and pre-treatment steps. 
     
     
         13 . The method for producing the lyocell fiber according to  claim 12  using an aqueous tertiary amine oxide, preferably aqueous NMMO. 
     
     
         14 . The method according to  claim 11 , wherein the spinning solution contains a pulp with a hemicelluloses content of greater than 10 wt.-% based on the total weight of cellulose and hemicelluloses contained. 
     
     
         15 . Lyocell fiber, use or method according to  claim 1 , wherein the pulp has a scan viscosity of from 300 to 440 ml/g. 
     
     
         16 . A product, comprising the lyocell fiber according to  claim 1  or the fiber produced according to  claim 11 . 
     
     
         17 . Product according to  claim 16 , wherein the product is a non-woven fabric. 
     
     
         18 . Product according to  claim 16 , selected among tissues and wipes. 
     
     
         19 . Product according to  claim 16  wherein the product is a speciality paper. 
     
     
         20 . Product according to  claim 19  wherein the speciality paper product is a filter. 
     
     
         21 . The pulp according to  claim 10 , wherein the pulp comprises 8 wt.-% or more xylan. 
     
     
         22 . The pulp according to  claim 10 , wherein the pulp comprises 10 wt.-% or more xylan. 
     
     
         23 . The pulp according to  claim 8 , wherein the pulp comprises 3 wt.-% or more mannan. 
     
     
         24 . The pulp according to  claim 8 , wherein the pulp comprises 5 wt.-% or more mannan. 
     
     
         25 . The pulp according to  claim 8 , wherein the pulp comprises 1 wt.-% or less mannan.