Patent ID: 6042890
Filing Date: 2000-03-28
Classification: D06M

Abstract:
Process for producing a strengthened fiber assembly including fibers of cellulose, said cellulose having a structure wherein said structure is the crystalline structure of cellulose II, which process comprises the steps of:providing an aqueous solution of N-methylmorpholine-N-oxide,contacting said fiber assembly with said aqueous solution of N-methylmorpholine-N-oxide at elevated temperature in accordance with the following relation so as to obtain a strengthened fiber assembly:947+0.30.times.log.sub.(10) t+0.046.times.T-3.53.times.C+645.times.log.sub.(10)C=valuewhere t is the time in minutes during which said fiber assembly is contacted with said aqueous N-methylmorpholine-N-oxide solution, T is the temperature of said aqueous N-methylmorpholine-N-oxide solution in .degree.C. and C is concentration of N-methylmorpholine-N-oxide in percent by mass, based on said aqueous N-methylmorpholine-N-oxide solution, and wherein value is a number in the range of 0.30 to 1.70 when T is less than 130.degree. C. and C is in the range of 70 and 84% by mass, andwashing said strengthened fiber assembly.