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

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 C6 carbon, the other C6 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 C2 and C3 carbons, the other C2 and C3 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, wherein the first step is carried out at neutral or acidic pH, and wherein the solid material comprises an assembly of yarns or fibers that form a unitary entity that is insoluble in water at said pH;
• and
• then
• a second step of placing in contact the material comprising the assembly of yarns or fibers that form a unitary entity thus processed and a solution of periodic acid or of a salt thereof,
• wherein the solid material so obtained has a degree of oxidation which corresponds to the conversion of alcohol and/or aldehyde functions in the cellobiose units into carboxylic acid functions, of greater than 10% calculated by the mass of said carboxylic acid functions contained in 100 g of the solid material.