Oxidized cellulose-based material, method for obtaining same and use thereof as compress

Abstract

The present invention relates to a method of obtaining a solid material based on a polymer having its cellobiose units exhibiting the following characteristics: at least some of the cellobiose units have at least one carboxylic acid function attached to the C 6 carbon, the other C 6 carbons having a primary alcohol function attached thereto; and at least some of the cellobiose units have at least one of the two rings open between the C 2 and C 3 carbons, the other C 2 and C 3 carbons forming a ring and having an alcohol function attached thereto. Such a material, advantageously a textile, may be used as a compress.

1 . A method of obtaining a solid material based on a polymer comprising cellobiose units, wherein:
 at least some of the cellobiose units have at least one carboxylic acid function attached to the C 6  carbon, the other C 6  carbons having a primary alcohol function attached thereto; and   at least some of the cellobiose units have at least one of the two rings open between the C 2  and C 3  carbons, the other C 2  and C 3  carbons forming a ring and having an alcohol function attached thereto,   
       said method comprising the following steps:
 a first step of placing in contact a solid material based on polymer containing cellobiose units and an oxidizing mixture comprising a hypohalite, a halite, and an oxoammonium salt or a precursor of said salt; and then 
 a second step of placing in contact the material thus processed and a solution of periodic acid or of a salt thereof. 
 
     
     
         2 . The method according to  claim 1 , said method comprising a third step of placing in contact the material having been submitted to the first two steps and a halite solution. 
     
     
         3 . The method according to  claim 1 , wherein the oxidizing mixture comprises from 0.0003 to 0.0006 mole per gram of polymer of oxoammonium salt or a precursor of said salt. 
     
     
         4 . The method according to  claim 1 , wherein the oxidizing mixture comprises from 0.0006 to 0.0049 mole per gram of hypohalite polymer. 
     
     
         5 . The method according to  claim 1 , wherein the oxidizing mixture comprises from 0.006 to 0.025 mole per gram of halite polymer, advantageously sodium chlorite. 
     
     
         6 . The method according to  claim 1 , wherein the first step is carried out at a pH in the range from 5 to 7. 
     
     
         7 . The method according to  claim 1 , wherein the first step is carried out at a temperature greater than 40° C. 
     
     
         8 . (canceled) 
     
     
         9 . The method according to  claim 1 , wherein the solution of periodic acid or of a salt thereof comprises from 0.003 to 0.012 mole per gram of polymer, of periodic acid, or of a salt thereof. 
     
     
         10 . The method according to  claim 1 , wherein the second step is carried out at a pH in the range from 2 to 5. 
     
     
         11 . The method according to  claim 1 , wherein the second step is carried out at a temperature in the range from 5 to 60° C. 
     
     
         12 . (canceled) 
     
     
         13 . The method according to  claim 2 , wherein the halite solution comprises from 0.0025 to 0.012 mole per gram of polymer, of halite. 
     
     
         14 . The method according to  claim 2 , wherein the third step is carried out at a pH in the range from 5 to 7. 
     
     
         15 . The method according to  claim 2 , wherein the third step is carried out at a temperature greater than 15° C. 
     
     
         16 . (canceled) 
     
     
         17 . (canceled) 
     
     
         18 . The method according to  claim 1 , wherein between the first two steps and/or after the second step and/or after the third step, a protonation step is performed, said protonation step comprising incubating the material in a protonation medium. 
     
     
         19 . (canceled) 
     
     
         20 . A solid material capable of being obtained by means of the method of  claim 1 , wherein:
 the material is a textile; and   the material is based on a polymer having its cellobiose units exhibiting the following characteristics:
 at least some of the cellobiose units have at least one carboxylic acid function attached to the C 6  carbon, the other C 6  carbons having a primary alcohol function attached thereto; and 
 at least some of the cellobiose units have at least one of the two rings open between the C 2  and C 3  carbons, the other C 2  and C 3  carbons forming a ring and supporting an alcohol function. 
   
     
     
         21 . The solid material according to  claim 20 , wherein the polymer is cellulose or viscose. 
     
     
         22 . The solid material according to  claim 20 , wherein the C 2  and C 3  carbons have an aldehyde function, optionally functionalized, attached thereto. 
     
     
         23 . The solid material according to  claim 20 , wherein the C 2  and/or C 3  carbons have a carboxylic acid function, optionally functionalized, attached thereto. 
     
     
         24 . The solid material according to  claim 20 , said solid material having a general oxidation level greater than 10%. 
     
     
         25 . A compress comprising the solid material according to  claim 20 .