Melt-processed material with high cellulose fiber content

A method of preparing a product wherein the method comprises;

• a) providing a material comprising cellulose fibers wherein the cellulose fibers are at least partly modified to contain dialcohol cellulose and wherein the amount of the modified cellulose fibers in the material is more than 60 wt %;
• and
• wherein the degree of conversion of the at least partly modified cellulose to dialcohol cellulose, based on the total number of oxidizable C2-C3 bonds in the cellulose material, is at least 10% but less than 70%;
• b) melt-processing the material into the product by extrusion, extrusion casting, extrusion coating or by extruding a film of the material onto a cooling roller or onto a substrate which is arranged on a roller;
• and
• wherein the modification of the cellulose fibers is done in two steps where the first step is oxidizing the cellulose on/in the fibrils constituting the cellulose fibers to dialdehyde cellulose to a desired extent and then reducing the dialdehyde groups on the cellulose to dialcohol cellulose, and wherein the oxidation is mainly heterogeneous reaction performed in a fiber suspension.