OXIDISED CELLULOSE

摘要

A method of preparing oxidised cellulose and intermediate oxidised cellulose, and compositions or dispersions comprising said oxidised cellulose are disclosed. Cellulose particles with a median volume particle diameter (D(v,0.5)s) in the range from 30 μm to 70 μm are reacted in the presence of a nitroxyl radical catalyst, halide co-catalyst, and oxidant, to produce intermediate oxidised cellulose particles. The intermediate oxidised cellulose particles are neutralised, and shear pressure applied to produce oxidised cellulose particles having a median volume particle diameter value (D(v,0.5)p) of less than D(v,0.5)s, a ratio of D(v,0.5)s to D(v,0.5)p from 1.1 to 5.0:1, and an oxidation value in the range from 15% to 30%. The oxidised particles may be formed in to dispersions, with the dispersions particularly used to provide desired skin feel in personal care compositions.

主权项

1. A method of preparing oxidised cellulose comprising;
(i) reacting cellulose particles, having a median volume particle diameter value (D(v,0.5)s) in the range from 30 μm to 70 μm, in the presence of at least one nitroxyl radical catalyst, at least one halide co-catalyst, and at least one oxidant, wherein the temperature of the reaction is in the range from 1° C. to 30° C., and the pH is in the range from 8 to 12, to produce intermediate oxidised cellulose particles; (ii) neutralising said intermediate oxidised cellulose particles; and (iii) applying shear at a pressure in the range from 200 to 1,500 bar to said neutralised oxidised cellulose particles to produce oxidised cellulose particles having a median volume particle diameter value (D(v,0.5)p) of less than D(v,0.5)s, and a ratio of D(v,0.5)s to D(v,0.5)p in the range from 1.1 to 5.0:1, said oxidised cellulose particles having an oxidation value in the range from 15% to 30%.