OXIDIZED CELLULOSE-BASED MATERIAL, METHOD FOR OBTAINING SAME AND USE THEREOF AS COMPRESS
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 .